Tokushima University / Educator and Researcher Directory --- Hioki, Zenro

Personal Web Page

https://wwp.ait.tokushima-u.ac.jp/physics-theory/hioki/

https://researchmap.jp/read0017360 (researchmap)

Field of Study

○	Theoretical Elementary Particle Physics

Subject of Study

○	Study of top-quark interactions (top quark, non-standard physics, anomalous coupling, decoupling theorem, lepton angular distribution) (Future high-energy accelerators like NLC/LHC are expected to work as top-quark factories. Top-quark interactions may work as a window to a physics beyond the standard electroweak model. We are studying them in a model-independent way, and recently found a theorem that the resultant-lepton angular distribution is insensitive to top-quark decay interactions whatever its production mechanism is.)

Book / Paper

Book:

1.	Zenro Hioki : Quantum Mechanics [ Revised Edition ], --- Its Basic Framework ---, 吉岡書店, Kyoto, Jan. 2014. (Summary) 本書は，必ずしも物理学を専攻する訳ではない学生や，本格的な教科書に取り組み始めたもののその広さの中で道に迷っている物理学専攻の学生に，量子力学の基本的な構成を理解させるための入門書であり，特にシュレディンガー方程式の理解· 扱い方の修得を到達目標としている．必要な予備知識は，大学初年級の力学·電磁気学と微積分程度に限定されており，かつ状況に応じて本文中あるいは付録において解説も行われる．週1回90分の講義においてなら，丁寧に解説して1年間で終了する程度の分量となっている．本書の最大の特色は，既存の標準的な教科書なら必ず扱っている項目でも，その複雑さのために初学者にとってシュレディンガー方程式の理解の妨げとなる恐れのあるものは躊躇なくカットし，その分，絞り込んだ必要最小限の題材について，式変形も含めかなり詳しく解説してあることである．従って，本書の反復学習により学生は量子力学の基本的な理解を達成でき，より上級の学習コースへと進んでいくことが出来るだろう．
2.	Zenro Hioki : Relativistic Quantum Fields, --- Foundation Properties of the operators ---, 吉岡書店, Kyoto, Oct. 2008. (Summary) 場の量子論は，素粒子物理学や物性物理学に現れる諸現象を精密に記述できる基礎理論体系である．その中で「波動場を量子化すれば粒子像が生まれる」という重要な事実を表す生成消滅演算子は，フォック空間という量子状態の舞台の基本的構成要素であり，摂動計算などにおいて中心的な役割を担う，言わば，場の量子論の一つの象徴である．本書の目的は，学部3・4年次から大学院修士課程レベルの読者を対象に，量子力学の相対論化から説き起こし，場の正準量子化，相対論的量子場-主として自由場と生成消滅演算子-の基本的な性質やファインマン伝播関数などそこに含まれる重要な基礎概念・事項を詳述することである．とりわけ，この生成消滅演算子の基礎的性質を様々な角度から解説することに力点が置かれる．従って，本書が扱う項目は通常のテキストに比べて少々限定的ではあるが，それだけに説明は詳しく丁寧であり，本書を通じて場の量子論の基礎を身につけた読者は，自信を持って中上級コースの学習へと進むことができるだろう．
3.	Zenro Hioki : Quantum Field Theory [ Revised Edition ], --- Foundation of Perturbation Calculations ---, 吉岡書店, Kyoto, Feb. 2005. (Summary) 場の量子論は微視的な世界を記述する強力かつ精密な理論体系として，素粒子物理学や物性物理学において広い守備範囲を持っており，現代の物理学を目指す学部生·院生は，この理論をしっかりと学ぶことが要求されている．本書はこの理論の基本的な構成をスケッチするとともに，そこにおける主要な計算方法である共変的な摂動論の基礎を与え，さらに具体的に幾つかの量の第1次近似での計算を示す．教科書の部分部分については何とか理解しているが，全体のイメージがいまひとつ掴めない，あるいは具体的な摂動計算がまだうまくできないといった読者には最良のテキストになるであろう．また，研究現場にいる人には「場の量子論·摂動計算の公式集」としての利用価値がある．
4.	Zenro Hioki : Quantum Mechanics, --- Its Basic Framework ---, 吉岡書店, Kyoto, Sep. 2001. (Summary) 本書は，必ずしも物理学を専攻する訳ではない学生や，本格的な教科書に取り組み始めたもののその広さの中で道に迷っている物理学専攻の学生に，量子力学の基本的な構成を理解させるための入門書であり，特にシュレディンガー方程式の理解· 扱い方の修得を到達目標としている．必要な予備知識は，大学初年級の力学·電磁気学と微積分程度に限定されており，かつ状況に応じて本文中あるいは付録において解説も行われる．週1回90分の講義においてなら，丁寧に解説して1年間で終了する程度の分量となっている．本書の最大の特色は，既存の標準的な教科書なら必ず扱っている項目でも，その複雑さのために初学者にとってシュレディンガー方程式の理解の妨げとなる恐れのあるものは躊躇なくカットし，その分，絞り込んだ必要最小限の題材について，式変形も含めかなり詳しく解説してあることである．従って，本書の反復学習により学生は量子力学の基本的な理解を達成でき，より上級の学習コースへと進んでいくことが出来るだろう．
5.	Zenro Hioki : PARTICLE PHYSICS EXPERIMENTS AT JLC, High Energy Accelerator Research Organization, Tsukuba, Sep. 2001.
6.	Zenro Hioki : Quantum Field Theory, --- Foundation of Perturbation Calculations ---, 吉岡書店, Kyoto, May 1999. (Summary) 場の量子論は微視的な世界を記述する強力かつ精密な理論体系として，素粒子物理学や物性物理学において広い守備範囲を持っており，現代の物理学を目指す学部生·院生は，この理論をしっかりと学ぶことが要求されている．本書はこの理論の基本的な構成をスケッチするとともに，そこにおける主要な計算方法である共変的な摂動論の基礎を与え，さらに具体的に幾つかの量の第1次近似での計算を示す．教科書の部分部分については何とか理解しているが，全体のイメージがいまひとつ掴めない，あるいは具体的な摂動計算がまだうまくできないといった読者には最良のテキストになるであろう．また，研究現場にいる人には「場の量子論·摂動計算の公式集」としての利用価値がある．

Academic Paper (Judged Full Paper):

1.	Zenro Hioki : Decoupling theorem in top productions/decays revisited, --- To what extent can we understand it visually? ---, International Journal of Modern Physics A, Vol.31, No.4&5, 1650011-1-1650011-13, 2016. (Summary) I revisit here the decoupling theorem in top-quark productions/decays, which states that the angular distribution of any final-particle produced in those processes does not depend on any possible nonstandard top-quark decay interactions at their leading order when certain conditions are satisfied. Towards a simple, intuitive and visual understanding of this theorem, I will study to what extent we could explain why such a theorem holds without relying on any specific/detailed calculations. (Tokushima University Institutional Repository) ● Metadata: 119045 (Link to Publication Site) ● Publication site (DOI): 10.1142/S0217751X16500111 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1142/S0217751X16500111 (Tokushima University Institutional Repository: 119045, DOI: 10.1142/S0217751X16500111)
2.	Zenro Hioki and Kazumasa Ohkuma : Latest constraint on nonstandard top-gluon couplings at hadron colliders and its future prospect, Physical Review D, Particles, Fields, Gravitation and Cosmology, Vol.88, No.1, 017503-1-017503-4, 2013. (Summary) Constraints on the nonstandard top-gluon couplings composed of the chromomagnetic- and chromoelectric-dipole moments of the top quark are updated by combining the latest data of top-pair productions from the Tevatron, 7-TeV LHC, and 8-TeV LHC. We find that adding the recent 8-TeV data to the analysis is effective to get a stronger constraint on the chromoelectric-dipole moment than the one from the Tevatron and 7-TeV LHC alone. We also discuss how those constraints on the nonstandard couplings could be further improved when 14-TeV LHC results become available in the near future. (Link to Publication Site) ● Publication site (DOI): 10.1103/PhysRevD.88.017503 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1103/PhysRevD.88.017503 (DOI: 10.1103/PhysRevD.88.017503)
3.	Zenro Hioki and Kazumasa Ohkuma : Exploring anomalous top-quark interactions via the final lepton in ttbar productions/decays at hadron colliders, Physical Review D, Particles, Fields, Gravitation and Cosmology, Vol.83, No.11, 114045-1-114045-11, 2011. (Summary) We study momentum distributions of the final-state charged lepton in ppbar/pp --> ttbar --> l^+ X (l=e or mu) at hadron colliders, i.e., Tevatron and Large Hadron Collider (LHC) in order to explore possible new-physics effects in the top-quark sector. Assuming general model-independent ttbar g + ttbar gg and tbW interactions beyond the standard model, we first derive analytical formulas for the corresponding parton-parton processes. We then compute the lepton angular, energy and transverse-momentum distributions in ppbar/pp collisions to clarify how they are affected by those anomalous couplings. (Link to Publication Site) ● Publication site (DOI): 10.1103/PhysRevD.83.114045 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1103/PhysRevD.83.114045 (DOI: 10.1103/PhysRevD.83.114045)
4.	Zenro Hioki and Kazumasa Ohkuma : Addendum to: Search for anomalous top-gluon couplings at LHC revisited, The European Physical Journal C - Particles and Fields, Vol.71, No.2, 1535-1-1535-2, 2011. (Summary) In our latest paper ``Search for anomalous top-gluon couplings at LHC revisited'' in Eur. Phys. J. C65 (2010), 127--135 (arXiv:0910.3049 [hep-ph]), we studied possible effects of nonstandard top-gluon couplings through the chromoelectric and chromomagnetic moments of the top quark using the total cross section of ppbar/pp --> ttbar X at Tevatron/LHC. There we pointed out that LHC data could give a stronger constraint on them, which would be hard to obtain from Tevatron data alone. We show here the first CMS measurement of this cross section actually makes it possible. (Link to Publication Site) ● Publication site (DOI): 10.1140/epjc/s10052-010-1535-8 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1140/epjc/s10052-010-1535-8 (DOI: 10.1140/epjc/s10052-010-1535-8)
5.	Zenro Hioki and Kazumasa Ohkuma : Search for anomalous top-gluon couplings at LHC revisited, The European Physical Journal C - Particles and Fields, Vol.65, No.1-2, 127-135, 2010. (Summary) Through top-quark pair productions at LHC, we study possible effects of nonstandard top-gluon couplings yielded by SU(3)xSU(2)xU(1) invariant dimension-6 effective operators. We calculate the total cross section and also some distributions for p p -> t tbar X as functions of two anomalous-coupling parameters, i.e., the chromoelectric and chromomagnetic moments of the top, which are constrained by the total cross section sigma(p pbar -> t tbar X) measured at Tevatron. We find that LHC might give us some chances to observe sizable effects induced by those new couplings. (Link to Publication Site) ● Publication site (DOI): 10.1140/epjc/s10052-009-1204-y (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1140/epjc/s10052-009-1204-y (DOI: 10.1140/epjc/s10052-009-1204-y)
6.	Zenro Hioki, Takuya Konishi and Kazumasa Ohkuma : Studying possible CP-violating Higgs couplings through top-quark pair productions at muon colliders, Journal of High Energy Physics, Vol.07, No.082, 1-14, 2007. (Summary) We study possible anomalous CP-violating Higgs couplings to mu mu-bar and t t-bar fully model-independent way through top-quark pair productions at muon colliders. Assuming additional non-standard neutral Higgs bosons, whose couplings with top-quark and muon are expressed in the most general covariant form, we carry out analyses of effects which they are expected to produce via CP-violating asymmetries and also the optimal-observable (OO) procedure under longitudinal and transverse muon polarizations. We find the measurement of the asymmetry for longitudinal beam polarization could be useful to catch some signal of CP violation, and an OO analysis might also be useful if we could reduce the number of unknown parameters with a help of other experiments and if the size of the parameters is at least O(1) ~ O(10). (Keyword) heavy quark physics / beyond standard model / CP violation / Higgs physics / MU(+)MU(-) COLLIDERS / S-CHANNEL / BOSON / POLARIZATION / PHYSICS (Link to Publication Site) ● Publication site (DOI): 10.1088/1126-6708/2007/07/082 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1088/1126-6708/2007/07/082 (DOI: 10.1088/1126-6708/2007/07/082)
7.	Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Jose Wudka : NEW-PHYSICS SEARCH THROUGH GAMMA GAMMA -> t tbar -> lX/bX, Nuclear Physics B - Proceedings Supplements, Vol.157, No.1, 246-250, 2006. (Summary) We probe optimal beam polarizations for new-physics search in top-quark and Higgs-boson sectors at Photon Linear Colliders (PLC). Expressing possible non-standard effects generated by SU(2)xU(1) gauge-invariant dimension-6 effective operators as anomalous top and Higgs couplings, we estimate expected statistical sensitivities of these couplings in gamma gamma -> t tbar -> lX/bX, using the optimal-observable method. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.nuclphysbps.2006.03.028 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.nuclphysbps.2006.03.028 (DOI: 10.1016/j.nuclphysbps.2006.03.028)
8.	Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Jose Wudka : NEW PHYSICS AT THE TOP, Acta Physica Polonica B, Vol.37, No.4, 1085-1091, 2006. (Summary) We consider the possibility of using t tbar production at photon colliders as a probe for physics beyond the Standard Model. The angular and energy distributions of top-quark decay products are employed in the analysis that determines the accuracy with which the new-physics parameters can be measured. (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-33746056028 (Elsevier: Scopus)
9.	Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Jose Wudka : STUDYING POSSIBLE ANOMALOUS TOP-QUARK COUPLINGS AT PHOTON COLLIDERS, Acta Physica Polonica B, Vol.36, No.11, 3531-3540, 2005. (Summary) Search for new-physics through possible anomalous t tbar gamma, tbW and gamma gamma H couplings which are generated by SU(2) X U(1) gauge-invariant dimension-6 effective operators is discussed, using energy and angular distributions of final charged-lepton/ b-quark in gamma gamma -> t tbar -> l X / bX for various beam polarizations. Optimal beam polarizations that minimize uncertainty in determination of those non-standard couplings are found performing an optimal-observable analysis. (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-33644969299 (Elsevier: Scopus)
10.	Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Jose Wudka : OPTIMAL BEAM POLARIZATIONS FOR NEW-PHYSICS SEARCH THROUGH GAMMA GAMMA ---> T ANTI-T ---> LX/BX, Journal of High Energy Physics, Vol.11, No.029, 1-15, 2005. (Summary) We perform an optimal-observable analysis of the final charged-lepton/b-quark momentum distributions in gamma+gamma -> t+tbar -> lX/bX for various beam polarizations in order to study possible anomalous t-tbar-gamma, tbW and gamma-gamma-H couplings, which could be generated by SU(2)xU(1) gauge-invariant dimension-6 effective operators. We find optimal beam polarizations that will minimize the uncertainty in determination of those non-standard couplings. We also compare e+ebar and gamma+gamma colliders from the viewpoint of the anomalous-top-quark-coupling determination. (Link to Publication Site) ● Publication site (DOI): 10.1088/1126-6708/2005/11/029 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1088/1126-6708/2005/11/029 (DOI: 10.1088/1126-6708/2005/11/029)
11.	Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Jose Wudka : Probing anomalous top-quark couplings induced by dim.6 operators at photon colliders, Nuclear Physics B, Vol.689, No.1-2, 108-126, 2004. (Summary) Possible anomalous top-quark couplings induced by SU(2) x U(1) gauge-invariant dimension-6 effective operators were studied in the process of t t-bar productions and decays at polarized gamma gamma colliders. Two CP-violating asymmetries, a linear-polarization asymmetry and a circular-polarization asymmetry, were computed including both non-standard [t t-bar gamma] and [gamma gamma H] couplings. An optimal-observable analysis for the process gamma gamma --> t t-bar --> l^{+-} ... was performed in order to estimate the precision for determination of all relevant non-standard couplings, including the anomalous tbW coupling. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.nuclphysb.2004.04.006 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.nuclphysb.2004.04.006 (DOI: 10.1016/j.nuclphysb.2004.04.006)
12.	Katsumasa Ikematsu, Keisuke Fujii, Zenro Hioki, Yukinari Sumino and Tohru Takahashi : HOW WELL CAN WE RECONSTRUCT THE T ANTI-T SYSTEM NEAR ITS THRESHOLD AT FUTURE E+ E- LINEAR COLLIDERS?, The European Physical Journal C - Particles and Fields, Vol.29, No.1, 1-10, 2003. (Summary) We developed a new method for full kinematical reconstruction of the ttbar system near its threshold at future linear e+e- colliders. In the core of the method lies likelihood fitting which is designed to improve measurement accuracies of the kinematical variables that specify the final states resulting from ttbar decays. The improvement is demonstrated by applying this method to a Monte-Carlo ttbar sample generated with various experimental effects including beamstrahlung, finite acceptance and resolution of the detector system, etc. In most cases the fit brings a broad non-Gaussian distribution of a given kinematical variable to a nearly Gaussian shape, thereby justifying phenomenological analyses based on simple Gaussian smearing of parton-level momenta. The standard deviations of the resultant distributions of various kinematical variables are given in order to facilitate such phenomenological analyses. A possible application of the kinematical fitting method and its expected impact are also discussed. (Link to Publication Site) ● Publication site (DOI): 10.1140/epjc/s2003-01202-9 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0043133521 (DOI: 10.1140/epjc/s2003-01202-9, Elsevier: Scopus)
13.	Bohdan Grzadkowski and Zenro Hioki : OPTIMAL OBSERVABLE ANALYSIS OF THE ANGULAR AND ENERGY DISTRIBUTIONS FOR TOP QUARK DECAY PRODUCTS AT POLARIZED LINEAR COLLIDERS, Nuclear Physics B, Vol.585, No.1-2, 3-27, 2000. (Summary) An optimal-observable analysis of the angular and energy distributions of the leptons and bottom quarks in the process e+e- --> tt-bar --> l^{+-}/b(b-bar)... has been performed in order to measure the most general top-quark couplings to gauge bosons at polarized linear colliders. The optimal beam polarization for determination of each coupling has been found. A very sensitive test of CP violation in tt-bar production and decay has been proposed. (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0002939004 (Elsevier: Scopus)
14.	Bohdan Grzadkowski and Zenro Hioki : PROBING TOP QUARK COUPLINGS AT POLARIZED NLC, Physical Review D, Particles, Fields, Gravitation and Cosmology, Vol.61, No.1, 014013-1-014013-15, 2000. (Summary) The energy spectrum of the lepton(s) in e^+e^- --> tt-bar --> l^{+-} ...../l^+l^-..... at next linear colliders (NLC) is studied for arbitrary longitudinal beam polarizations as a possible test of new physics in top-quark couplings. The most general non-standard couplings for gamma-tt-bar, Ztt-bar and Wtb vertices are considered. Expected precision of the non-standard-parameter determination is estimated applying the optimal-observable procedure. (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-16644389558 (Elsevier: Scopus)
15.	Longin Brzezinski, Bohdan Grzadkowski and Zenro Hioki : EFFECTS OF NONSTANDARD INTERACTIONS FOR THE ENERGY SPECTRUM OF SECONDARY LEPTONS IN E+ E- ---> T ANTI-T, International Journal of Modern Physics A, Vol.14, No.8, 1261-1281, 1999. (Summary) The process of top-quark pair production followed by semileptonic decays at future high-energy e^+e^- linear colliders is investigated as a possible test of physics beyond the Standard Model. Assuming the most general non-standard forms for gamma t t-bar, Z t t-bar and Wtb couplings, the energy spectrum of the single lepton l^{+-} and the energy correlation of l^+ and l^- emerging from the process e^+e^- --> t t-bar --> l^{+-} ... /l^+l^- ... are calculated. Expected precision of the non-standard-parameter determination is estimated adopting the recently-proposed optimal method.
16.	Zenro Hioki and Kazumasa Ohkuma : REMARK ON CP VIOLATING POLARIZATION ASYMMETRY OF T ANTI-T VIA ANOMALOUS COUPLINGS TO GAMMA AND Z, Physical Review D, Particles, Fields, Gravitation and Cosmology, Vol.59, No.3, 037503-1-037503-4, 1999. (Summary) We calculate the CP-violating polarization asymmetry of tt-bar, delta =[ sigma(ee-bar --> t(-)t-bar(-))-sigma(ee-bar --> t(+)t-bar(+)) ]/ sigma(ee-bar --> tt-bar), for the most general tt-bar gamma/Z couplings without dropping any non-standard contribution. We find that one term which is usually neglected increases with s and will eventually become non-negligible at very high energy.
17.	Bohdan Grzadkowski, Zenro Hioki and Michal Szafranski : FOUR FERMI EFFECTIVE OPERATORS IN TOP QUARK PRODUCTION AND DECAY, Physical Review D, Particles, Fields, Gravitation and Cosmology, Vol.58, No.3, 035002-1-035002-13, 1998. (Summary) Effects of four-Fermi-type new interactions are studied in top-quark pair production and their subsequent decays at future e^+e^- colliders. Secondary-lepton-energy distributions are calculated for arbitrary longitudinal beam polarizations. An optimal-observables procedure is applied for the determination of new parameters.
18.	Bohdan Grzadkowski and Zenro Hioki : ENERGY SPECTRUM OF SECONDARY LEPTONS IN E+ E- ---> T ANTI-T, --- NONSTANDARD EFFECTS AND CP VIOLATION ---, Nuclear Physics B, Vol.484, No.1-2, 17-32, 1997. (Summary) The process of top-quark pair production at future high-energy e^+ e^- linear colliders has been investigated as a possible test of physics beyond the Standard Model. Non-standard interactions have been assumed both for the production and for the subsequent decay of the top quarks. The energy spectrum of the single lepton l^{+-} and the energy correlation of l^+ and l^- emerging from the process e^+e^- --> ttbar --> l^{+-} X/l^+l^-X are calculated. The energy- spectrum asymmetry of l^+ and l^- is considered as a measure of CP violation. An optimal method to determine whether CP violation occurs in the production or in the decay processes is proposed.
19.	Zenro Hioki : EW PRECISION ANALYSIS AND THE HIGGS MASS, Acta Physica Polonica B, Vol.27, No.10, 2573-2582, 1996. (Summary) Two topics on the standard electroweak theory are discussed based on its remarkable success in precision analyses. One is a test of structure of the radiative corrections to the weak-boson masses as a further precision analysis. The other is an indirect Higgs-boson search through the radiative corrections to the various quantities measured at LEP.
20.	Zenro Hioki : STRUCTURE OF ELECTROWEAK RADIATIVE CORRECTIONS, Acta Physica Polonica B, Vol.27, No.7, 1569-1579, 1996. (Summary) Looking into the inside of radiative corrections is an interesting subject as a deeper study of the standard electroweak theory after its remarkable success in the precision analyses. I will discuss here a test of ``structure" of the EW radiative corrections to the weak-boson masses, and show that we can now analyze several different parts separately.
21.	Zenro Hioki : STUDYING STRUCTURE OF ELECTROWEAK CORRECTIONS, International Journal of Modern Physics A, Vol.10, No.26, 3803-3815, 1995. (Summary) Several different effects in electroweak quantum corrections are explored separately through the latest data on the weak-boson masses. The leading-log approximation, the improved-Born approximation and the non-decoupling top-quark effects are studied without depending on the recent CDF data of mt, and the results are given in a form independent of the Higgs mass. On the other hand, the bosonic- and the non-decoupling Higgs effects are examined by fully taking account of those CDF data. It is emphasized that future precision measurements of Mw and mt are considerably significant not only for further studies of the electroweak theory at higher confidence level but also for new physics searches beyond it.
22.	Tsutom Hasuike, Toshihiko Hattori, Toshio Hayashi, Zenro Hioki and Seiichi Wakaizumi : B AND D MESON DECAYS IN THE HEAVY QUARK EFFECTIVE THEORY, Progress of Theoretical Physics, Vol.93, No.5, 927-937, 1995. (Summary) BおよびD中間子の非レプトンおよび半レプトン崩壊についての新しいデータを，重クォーク有効理論の枠内で調べ，この理論は，B中間子だけでなくD中間子の崩壊をもよく記述することを明らかにした．
23.	Zenro Hioki : O (ANTI-LAMBDA/M(C)) EFFECTS IN TESTS OF FACTORIZATION HYPOTHESIS FOR HEAVY HADRON NONLEPTONIC DECAYS, Zeitschrift für Physik C Particles and Fields, Vol.62, No.4, 633-637, 1994. (Summary) b クォークを含むハドロンの非レプトン崩壊を重クォーク有効理論により調べた．特に，Charm 質量補正について詳しい計算を行なった結果，遷移行列要素の「因子分解仮説」のテストは，この補正にはあまり影響されないことがわかった．
24.	Zenro Hioki : FINITE CHARM MASS EFFECTS IN F(D(S)) DETERMINATION WITHIN THE HEAVY QUARK EFFECTIVE THEORY, Progress of Theoretical Physics, Vol.92, No.5, 997-1003, 1994. (Summary) B中間子がD中間子に崩壊する反応を用いれば，D中間子崩壊定数を計算することが可能である．その際には，対応する遷移行列要素を評価しなければならないが，そこでは重クォーク有効理論を利用することが出来る．この論文では，従来の計算に対する Charm 質量補正について詳しく調べ，補正を取り入れた結果，理論値と測定値の一致が良くなることを示した．
25.	Michael Gronau, Tsutom Hasuike, Toshihiko Hattori, Toshio Hayashi, Zenro Hioki and Seiichi Wakaizumi : MEASURING THE CHIRALITY OF THE B QUARK CURRENT IN A(B) DECAY, Journal of Physics G: Nuclear and Particle Physics, Vol.19, No.12, 1987-1991, 1993. (Summary) 荷電弱 b-c カレントのカイラル構造を探る手段として，偏極Λb -> Λc lν 崩壊における生成粒子の角分布を計算した．具体的には l の Λb スピンに対する前後方非対称性，同じくΛc の前後方非対称性，および l，Λc の二重前後方非対称性で，いずれもこの分析にとって有用であることがわかった．
26.	Zenro Hioki : ELECTRON P(T) CUT EFFECTS ON LAMBDA(C) ENERGY ASYMMETRY IN POLARIZED LAMBDA(B) DECAY TO LAMBDA(C) E ANTI-ELECTRON-NEUTRINO, Physical Review D, Particles, Fields, Gravitation and Cosmology, Vol.48, No.7, 3404-3407, 1993. (Summary) 偏極Λb -> Λc eν 崩壊での Λc のエネルギー非対称性に対する電子横運動量カットの影響を調べた．その結果，この効果は実験結果の解析において極めて重要であり，これを無視すると純粋左巻カレントと左巻-右巻混合カレントの区別が非常に難しくなることがわかった．
27.	Zenro Hioki : PROBING B QUARK CHARGED CURRENT CHIRAL STRUCTURE VIA POLARIZED LAMBDA(B) SEMILEPTONIC DECAY, Zeitschrift für Physik C Particles and Fields, Vol.59, No.4, 555-561, 1993. (Summary) bクォークカレントの構造を調べるため，偏極Λb の半レプトン崩壊を調べた．終状態での電子およびΛc のエネルギー分布を計算し，電子の横運動量について実験的な制限を付けた式を導いた．結果として，電子エネルギーの分布は分析にとって有効だが，Λc の方はそのままでは使いにくいことがわかった．
28.	Zenro Hioki : CLEAN PRECISION TESTS OF THE ELECTROWEAK THEORY, Modern Physics Letters A, Vol.7, No.12, 1009-1021, 1992. (Summary) これまで行なってきた W-Z 質量関係式を用いた電弱精密解析について，最新のデータを用いて再度数値計算を行い，将来の研究へ向けての重要な点を指摘した．
29.	Zenro Hioki : TESTING NONDECOUPLING TOP CORRECTIONS, Physical Review D, Particles, Fields, Gravitation and Cosmology, Vol.45, No.5, 1814-1816, 1992. (Summary) 電弱輻射補正の中でトップ質量の2乗に比例する項の存在は，対称性を自発的に破る理論に特有のものである．従って，この効果の存在を示すことは電弱理論の精密検証にとって極めて重要である．そこで，W-Z 質量関係式においてこの項が存在しないと仮定した式による結果を実験値と比較し，その結果ヒッグスがどのような質量を持とうとも，トップからの寄与無しではデータを説明出来ないとこが明らかになった．
30.	Zenro Hioki : ELECTROWEAK QUANTUM EFFECTS IN THE M (W) - M (Z) RELATION, Zeitschrift für Physik C Particles and Fields, Vol.49, No.2, 287-292, 1991. (Summary) W-Z 質量関係式を用いて輻射補正の分析を行ない，そのために必要な式を全て他の反応に応用し易い形で与えた．また，Hollik および Sirlin の結果との比較を行い，非常によい精度で一致していることを確認した．
31.	Zenro Hioki : W BOSON MASS DETERMINATION FROM THE THRESHOLD BEHAVIOR OF SIGMA-T (E+ E- ---> W+ W-), --- ANALYSIS INCLUDING LEADING LOG AND HEAVY QUARK CORRECTIONS ---, Nuclear Physics B, Vol.316, No.1, 1-14, 1989. (Summary) 電子-陽電子消滅での W 対生成を用いての W の質量測定の可能性について詳しく調べた．特に，閾値付近での断面積の振舞いに注目し，その Input 依存性を計算し，そこでの不定性がどの程度 W の質量測定に影響を与えるかについて考察した．その結果，量子効果の精密検証に必要な程度の精度を得ることは可能であることがわかった．
32.	Zenro Hioki : WEINBERG ANGLE IN THE NEUTRINO - ELECTRON SCATTERING: CALCULATIONS WITH M(Z) INPUT INCLUDING HIGHER ORDER CORRECTIONS, Zeitschrift für Physik C Particles and Fields, Vol.39, No.1, 65-67, 1988. (Summary) ニュートリノ-電子散乱におけるワインバーグ角測定に対する輻射補正の影響を，1ループ補正に加え全ての対数項を足し上げる近似において調べた．数値計算の際の Input としてはフェルミ結合定数の替りに Z の質量を用いた． (Link to Publication Site) ● Publication site (DOI): 10.1007/BF01560392 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1007/BF01560392 (DOI: 10.1007/BF01560392)
33.	Zenro Hioki : W+- BOSON PAIR PRODUCTION IN E+ E- PROCESS, --- HOW SHOULD WE DEVELOP THEORETICAL ANALYSIS? ---, Zeitschrift für Physik C Particles and Fields, Vol.35, No.1, 113-116, 1987. (Summary) 電子-陽電子反応における W ボソン対生成の断面積が実験的に測定された場合に，どのような理論的な解析を進めるべきかについて考察した．特に，高次補正計算の際の Input の取り方について注意深く調べた．
34.	Zenro Hioki : INTRODUCTION TO HIGHER ORDER ANALYSIS OF THE ELECTROWEAK INTERACTION, Acta Physica Polonica B, Vol.17, No.12, 1037-1084, 1986. (Summary) SU(2)×U(1) 電弱理論における高次補正の計算方法について詳しい解説を行った．いくつかの反応に対する1ループ補正の式を全て具体的に与え，また，それらに対する近似式を導き，さらに W，Z 質量関係式との関連について論じた．
35.	Zenro Hioki : Mw-Mz Relation as a Clean Test of Higher Order Effects and Its Application to Heavy Fermion Search, Soryushiron Kenkyu Electronics, Vol.69, No.5, 191-201, 1984. (Summary) Mw-Mz 質量関係式を用いた電弱精密解析について，その重要ポイントを整理し，更にそれが未発見の重いフェルミオン探しにとって極めて有効であることを指摘した．
36.	Zenro Hioki : ROLE OF HEAVY FERMIONS AND HEAVY HIGGS SCALARS IN THE ELECTROWEAK CORRECTION TO THE M (W) - M (Z) RELATION, Nuclear Physics B, Vol.229, No.2, 284-300, 1983. (Summary) W-Z 質量関係式に対する電弱量子効果における重いトップクォークおよび重いヒッグスボソンの役割について調べた．トップの寄与についてはその質量の2乗に比例する項が生じるが，ヒッグスについては対数項のみが残ることを具体的に示した．また，実験で測定されたばかりの W，Z の質量を用い，トップの質量はだいたい 250 GeV よりは軽くなければならないことを示した．
37.	Zenro Hioki, Shoichi Midorikawa and Hiroyuki Nishiura : HIGGS BOSON PRODUCTION IN HIGH-ENERGY LEPTON - NUCLEON SCATTERING, Progress of Theoretical Physics, Vol.69, No.5, 1484-1497, 1983. (Summary) 高エネルギーレプトン-核子散乱におけるヒッグス粒子の生成断面積を計算した．核子の構造関数としては QCD 効果を含めたパートン模型を用い，また仮想的な(核子内)重クォークの寄与についても出来る限り正確に取り入れた．この結果，将来の実験において発見可能な質量の領域などに対する具体的な情報が得られた． (Link to Publication Site) ● Publication site (DOI): 10.1143/PTP.69.1484 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1143/PTP.69.1484 (DOI: 10.1143/PTP.69.1484)
38.	Ken-Ichi Aoki, Zenro Hioki, Rokuo Kawabe, Michiji Konuma and Taizo Muta : ELECTROWEAK THEORY, --- FRAMEWORK OF ON-SHELL RENORMALIZATION AND STUDY OF HIGHER ORDER EFFECTS ---, Progress of Theoretical Physics Supplement, Vol.73, 1-225, 1982. (Summary) この時点までの電弱高次効果計算の内容を総合し，更に W，Z の質量に対する輻射補正の計算を具体的に行った．また，1ループ計算に現れる積分を全て実行して公式の形にまとめ，加えてそれらの近似形も導いた．この結果，数値計算への応用も容易に行えるようになった． (Link to Publication Site) ● Publication site (DOI): 10.1143/PTPS.73.1 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1143/PTPS.73.1 (DOI: 10.1143/PTPS.73.1)
39.	Zenro Hioki : HOW DOES THE DISCOVERY OF Z BOSON IMPROVE THE PREDICTION FOR W+- BOSON MASS?, Progress of Theoretical Physics, Vol.68, No.6, 2134-2140, 1982. (Summary) 近い将来，Zボソンの質量が非常に正確に測定されるであろうことを考え，その質量を数値計算の Input の一つとして用いてWボソンの質量を1ループのレベルで計算した．これはWとZの質量関係式を与えるもので，その後，電弱理論の精密解析において極めて重要な役割を果たすことになった． (Link to Publication Site) ● Publication site (DOI): 10.1143/PTP.68.2134 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1143/PTP.68.2134 (DOI: 10.1143/PTP.68.2134)
40.	Zenro Hioki : HARD BREMSSTRAHLUNG EFFECTS IN PURELY LEPTONIC WEAK PROCESSES, --- ENERGY AND ANGLE CUT DEPENDENCE ---, Progress of Theoretical Physics, Vol.67, No.4, 1165-1176, 1982. (Summary) 青木-日置による先の論文はνe 散乱の全断面積に対する電磁補正であったが，ここでは放出される硬光子がいろいろな運動量(大きさ·方向)を持つ場合について詳しく調べ，先の論文で見出した二重対数項の打ち消し合いがどのように起こるのかを具体的に示した． (Link to Publication Site) ● Publication site (DOI): 10.1143/PTP.67.1165 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1143/PTP.67.1165 (DOI: 10.1143/PTP.67.1165)
41.	Ken-Ichi Aoki and Zenro Hioki : HARD PHOTON EMISSION IN HIGH-ENERGY NEUTRINO E SCATTERINGS, Progress of Theoretical Physics, Vol.66, No.6, 2234-2248, 1981. (Summary) 電弱輻射補正による先の論文の計算では，弱相互作用の量子効果は完全に取り入れられているが，電磁相互作用については軟光子近似を用いたため，直接実験と比較することが出来ない．そこで，硬光子放出の効果も含めるよう，更に計算を行った．その結果，大きな補正を生み出していた二重対数項が互いに打ち消しあい，全体の補正は最終的には非常に小さくなることがわかった． (Link to Publication Site) ● Publication site (DOI): 10.1143/PTP.66.2234 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1143/PTP.66.2234 (DOI: 10.1143/PTP.66.2234)
42.	Ken-Ichi Aoki, Zenro Hioki, Rokuo Kawabe, Michiji Konuma and Taizo Muta : ELECTROWEAK RADIATIVE CORRECTIONS TO HIGH-ENERGY NEUTRINO E SCATTERINGS, Progress of Theoretical Physics, Vol.65, No.3, 1001-1025, 1981. (Summary) 同著者による先の論文における計算をνN->μν，μ->eννbar といった荷電カレント反応にも適用した．この結果，WやZという粒子の質量に対する輻射補正も調べることが出来るようになり，実際それは予想外に大きいことが見出された．電磁相互作用の補正については軟光子放出の近似を採用した． (Link to Publication Site) ● Publication site (DOI): 10.1143/PTP.65.1001 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1143/PTP.65.1001 (DOI: 10.1143/PTP.65.1001)
43.	Zenro Hioki : SEARCH FOR CHARM - PAIR PRODUCTION EFFECTS IN LEPTON - HADRON AND HADRON - HADRON REACTIONS, Progress of Theoretical Physics, Vol.63, No.3, 970-981, 1980. (Summary) レプトン-核子および核子-核子反応におけるチャーム粒子対生成について調べた．特に，νN->μ^-μ^-X という反応の起源としてのチャーム対生成に着目し，そのために必要な断面積を求め，それが実際に他の反応のデータと矛盾しないかどうかの定量的なテストが，eN，μN反応において行えることを示した． (Link to Publication Site) ● Publication site (DOI): 10.1143/PTP.63.970 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1143/PTP.63.970 (DOI: 10.1143/PTP.63.970)
44.	Zenro Hioki : LEPTON INDUCED MULTI - MUON PRODUCTION, --- PHENOMENOLOGICAL ANALYSIS IN LEFT-HANDED SCHEME ---, Progress of Theoretical Physics, Vol.60, No.4, 1094-1103, 1978. (Summary) 高エネルギーνN反応でのμ^-μ^+，μ^-μ^-およびμ^-μ^-μ^+生成を，左巻カレントのみ含む模型において分析した．特に，μ^-μ^-生成についてはその起源が明らかではないため，チャーム粒子対生成およびそのμ崩壊という機構を仮定し，必要な生成断面積を計算した．
45.	Zenro Hioki : CONSTRAINTS ON THE MIXING ANGLE BETWEEN ORDINARY AND HEAVY LEPTONS IN A (V-A) MODEL, --- DETAILED ANALYSIS ---, Progress of Theoretical Physics, Vol.58, No.6, 1859-1868, 1978. (Summary) 同名(副題なし)の先の論文での分析を，より詳しく行った．更に，νN反応において発見されたμ^-μ^-μ^+生成との関連について調べ，この模型に含まれる重いレプトンが，一旦つくられた後すぐに崩壊すると仮定すれば，実験結果をうまく再現できることを示した．

Academic Paper (Unrefereed Paper):

1.	Zenro Hioki, Takuji Kawano, Masanori Miyata, Hiroshi Yoshida and 上岡麻衣子 : An annual report 2013 on campus wide Faculty Development programs at The University of Tokushima, Journal of University Education Research, No.11, 161-182, 2014. (Keyword) 初任者研修 / FDファシリテーター養成研修 / 授業コンサルテーション / FD・SDセミナー / 大学教育カンファレンス / ティーチング・ポートフォリオ / new faculty seminars / FD facilitator training seminars / individual consultations / education conference / teaching portfolio (Tokushima University Institutional Repository) ● Metadata: 106348 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1050865122807886720 (Tokushima University Institutional Repository: 106348, CiNii: 1050865122807886720)
2.	Zenro Hioki, Masanori Miyata, Takuji Kawano, Junko Kagawa, Hiroshi Yoshida and Rie Nara : An annual report 2012 on campus wide Faculty Development programs at The University of Tokushima, Journal of University Education Research, No.10, 152-175, 2013. (Keyword) 初任者研修 / FDファシリテーター養成研修 / 授業コンサルテーション / FD・SDセミナー / 大学教育カンファレンス / ティーチング・ポートフォリオ / new faculty seminars / FD facilitator training seminars / individual consultations / education conference / teaching portfolio (Tokushima University Institutional Repository) ● Metadata: 105998 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1050302172854522624 (Tokushima University Institutional Repository: 105998, CiNii: 1050302172854522624)
3.	Zenro Hioki, Masanori Miyata, Takuji Kawano, Junko Kagawa, Hiroshi Yoshida and Rie Nara : 2011年度徳島大学全学FD推進プログラムの実施報告, Journal of University Education Research, No.9, 152-171, 2012. (Keyword) 初任者研修 / ショニンシャケンシュウ / FDファシリテーター養成研修 / FD ファシリテーターヨウセイケンシュウ / 授業コンサルテーション / ジュギョウコンサルテーション / FD・SDセミナー / FD ・ SD セミナー / 大学教育カンファレンス / ダイガクキョウイクカンファレンス / new faculty seminars / new faculty seminars / FD facilitator training seminars / FD facilitator training seminars / individual consultations / individual consultations / education conference / education conference (Tokushima University Institutional Repository) ● Metadata: 95849 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1050865122808065024 (Tokushima University Institutional Repository: 95849, CiNii: 1050865122808065024)
4.	Zenro Hioki, Masanori Miyata, Takuji Kawano, Junko Kagawa, Sayaka Tanaka, Hiroshi Yoshida and 奈良理恵 : 2010年度徳島大学全学FD推進プログラムの実施報告, Journal of University Education Research, No.8, 172-191, 2011. (Keyword) New faculty seminars / FD Facilitator training seminars / Individual consultations / Education conference (Tokushima University Institutional Repository) ● Metadata: 82999 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1050302172854719232 (Tokushima University Institutional Repository: 82999, CiNii: 1050302172854719232)
5.	Kazumasa Ohkuma and Zenro Hioki : Anomalous top-couplings and momentum distributions of the final-lepton from ttbar productions/decays in parton collisions, Natural Science Research, Faculty of Integrated Arts and Sciences, The University of Tokushima, Vol.24, No.4, 33-46, 2010. (Summary) We study the momentum distributions of the final-state charged lepton in parton-parton collisions qqbar, gg → ttbar → lX (l= e or μ), considering their application to actual experimental-data analyses at high-energy hadron colliders, i.e., Tevatron and Large Hadron Collider (LHC). Assuming general anomalous ttg + ttgg and tbW couplings, we derive analytical formulas for the above distributions based on Kawasaki-Shirafuji-Tsai formalism. We there take into account all the terms on the former-coupling parameters while up to the linear terms about the latter. We then calculate the lepton energy- and angular-distributions to clarify how they are affected by the anomalous couplings, and also search, through the total cross sections, for the parameter range where quadratic (or higher-order) terms of nonstandard QCD couplings can safely be neglected and consequently we can carry out the optimal-observable analysis properly for estimating the expected statistical uncertainties in parameter measurements. (Keyword) Hadron colliders / Nonstandard couplings / Top-quark productions / Lepton distributions (Tokushima University Institutional Repository) ● Metadata: 70701 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1050302172854830080 (Tokushima University Institutional Repository: 70701, CiNii: 1050302172854830080)
6.	Kazumasa Ohkuma and Zenro Hioki : Search for anomalous top-gluon couplings at hadron colliders, Natural Science Research, Faculty of Integrated Arts and Sciences, The University of Tokushima, Vol.23, No.2, 19-28, 2009. (Summary) We study non-standard top-gluon-coupling effects from possible beyond-the-standard-model physics through top-quark pair productions at hadron colliders, i.e., Tevatron/LHC. We calculate the total cross section sigma(pp →t¯t) at LHC, and also the top-quark-jet angular distribution in t¯t productions at both Tevatron and LHC as a function of two anomalous-coupling parameters, i.e., the chromoelectric and chromomagnetic moments of the top, which are constrained by the total cross section sigma(p¯p → t¯tX) measured at Tevatron. We find that there will be some chances to observe sizable effects induced by those new couplings. (Tokushima University Institutional Repository) ● Metadata: 63755 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1050865122808264320 (Tokushima University Institutional Repository: 63755, CiNii: 1050865122808264320)
7.	Kazumasa Ohkuma, Takuya Konishi and Zenro Hioki : Top-quark pair productions and CP-violating Higgs interactions at muon colliders, Natural Science Research, Faculty of Integrated Arts and Sciences, The University of Tokushima, Vol.20, 1-6, 2006. (Summary) We study CP-violation effects from possible non-standard Higgs interactions in beyond-the-standard-model physics through top-quark pair productions at uar{u} colliders. We calculate two CP-violating asymmetries for longitudinal and transverse beam polarizations, and study their dependence on qrt{s} and m_H, the additional Higgs mass. Judging from their computed absolute values, we conclude that there are more chances to find non-standard effects in analyses using A_L, the longitudinal asymmetry, than in those using A_T, the transverse asymmetry. (Keyword) Non-standard Higgs interactions / Top-quark pair productions / CP violation / Muon collider (Tokushima University Institutional Repository) ● Metadata: 117490 (Link to Search Site for Scientific Articles) ● CiNii @ National Institute of Informatics (CRID): 1520853833573104640 (Tokushima University Institutional Repository: 117490, CiNii: 1520853833573104640)
8.	Sawako Fujita and Zenro Hioki : Angular Distribution of the Final Lepton in Polarized Top-Quark Decay, Natural Science Research, Faculty of Integrated Arts and Sciences, The University of Tokushima, Vol.17, 1-6, 2003. (Summary) The angular distribution of the final-state charged lepton in polarized top-quark semileptonic decay was calculated by using the most general invariant amplitude in order to explore possible non-standard top-quark interactions. Comparing the results with the standard-model predictions, we found that our results agree with those of the standard model up to terms linear in the anomalous couplings, but there appears some discrepancy when we include the square of their contributions. This discrepancy forms a correction to the decoupling theorem on the final-particle angular distribution in general top-quark production/decay.
9.	Zenro Hioki : Mz=88.6 GeV は何を意味するか?, Soryushiron Kenkyu Electronics, Vol.79, No.2, 23-26, 1989.
10.	Zenro Hioki : ROLE OF THE FERMI COUPLING CONSTANT AND Z BOSON MASS AS INPUT DATA TO DETERMINE SIN**2THETA(W), Journal of Science of College of General Education, University of Tokushima, Vol.22, 1-10, 1989.
11.	Zenro Hioki : WWγ及びWWZバーテックスに対するフェルミオンループ補正について, Journal of Science of College of General Education, University of Tokushima, Vol.21, 11-21, 1988.
12.	Zenro Hioki : 弱·電磁相互作用の高次効果, Soryushiron Kenkyu Electronics, Vol.66, No.5, 346-369, 1983.
13.	Zenro Hioki and Ken-Ichi Aoki : Weinberg-Salam 模型のくりこみ計算のために, Soryushiron Kenkyu Electronics, Vol.60, No.1, 1-37, 1979. (Link to Publication Site) ● Publication site (DOI): 10.24532/soken.60.1_1 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.24532/soken.60.1_1 (DOI: 10.24532/soken.60.1_1)

Academic Letter:

1.	Zenro Hioki, Kazumasa Ohkuma and Akira Uejima : Refined analysis and updated constraints on general non-standard tbW couplings, Physics Letters B, Vol.761, 219-222, 2016. (Summary) We recently studied possible non-standard tbW couplings based on the effective-Lagrangian which consists of four kinds of SU(3) x SU(2) x U(1) invariant dimension-6 effective operators and gave an experimentally allowed region for each non-standard coupling. We here re-perform that analysis much more precisely based on the same experimental data but on a new computational procedure using the Graphics-Processing-Unit (GPU) calculation system. Comparing these two analyses with each other, the previous one is found to have given quite reliable results despite of its limited computation capability. We then apply this new procedure to the latest data and present updated results. (Tokushima University Institutional Repository) ● Metadata: 113057 (Link to Publication Site) ● Publication site (DOI): 10.1016/j.physletb.2016.08.027 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-84983472713 (Tokushima University Institutional Repository: 113057, DOI: 10.1016/j.physletb.2016.08.027, Elsevier: Scopus)
2.	Zenro Hioki and Kazumasa Ohkuma : Full analysis of general non-standard tbW couplings, Physics Letters B, Vol.752, 128-130, 2016. (Summary) Possible non-standard couplings which could contribute to the t -> b W process are studied based on the effective-Lagrangian approach. The corresponding effective Lagrangian consists of four kinds of dimension-6 effective operators, each of which has an independent coupling constant. In this analysis, all those couplings are treated as complex numbers and constraints on them are estimated by using recent experimental data from the LHC. We point out that the resultant constraints on those couplings are still not that strong because contributions from some couplings can work oppositely with each other. (Tokushima University Institutional Repository) ● Metadata: 113054 (Link to Publication Site) ● Publication site (DOI): 10.1016/j.physletb.2015.11.029 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.physletb.2015.11.029 (Tokushima University Institutional Repository: 113054, DOI: 10.1016/j.physletb.2015.11.029)
3.	Zenro Hioki and Kazumasa Ohkuma : Final charged-lepton angular distribution and possible anomalous top-quark couplings in `pp -> t tbar X -> l⁺ X'`, Physics Letters B, Vol.736, No.1, 1-5, 2014. (Summary) Possible anomalous (or nonstandard) top-quark interactions with the gluon and those with the W boson induced by SU(3) x SU(2) x U(1) gauge-invariant dimension-6 effective operators are studied in p p -> t tbar X -> l^+ X' (l=e or mu) at the Large Hadron Collider (LHC). The final charged-lepton (l^+) angular distribution is first computed for nonvanishing nonstandard top-gluon and top-W couplings with a cut on its transverse momentum. The optimal-observable procedure is then applied to this distribution in order to estimate the expected statistical uncertainties in measurements of those couplings that contribute to this process in the leading order. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.physletb.2014.07.001 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.physletb.2014.07.001 (DOI: 10.1016/j.physletb.2014.07.001)
4.	Zenro Hioki and Kazumasa Ohkuma : Optimal-observable analysis of possible non-standard top-quark couplings in `pp -> t tbar X -> l⁺ X'`, Physics Letters B, Vol.716, No.2, 310-315, 2012. (Summary) Possible non-standard top-quark interactions with the gluon and the W boson induced by SU(3) X SU(2) X U(1) gauge-invariant dimension-6 effective operators are studied for hadron-collider experiments. Current limits on top-gluon couplings are presented by using the latest experimental data of t t-bar productions at the Tevatron and the Large Hadron Collider (LHC). The optimal-observable procedure is applied to the charged-lepton distributions in p p -> t t-bar X -> l^+ X' (l = e or mu) at the LHC in order to estimate the expected statistical uncertainties in measurements of those non-standard top-gluon and top-W couplings that contribute to this process in the leading order. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.physletb.2012.08.035 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.physletb.2012.08.035 (DOI: 10.1016/j.physletb.2012.08.035)
5.	Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Jose Wudka : Optimal-observable analysis of possible new physics using the b-quark in `γγ -> t tbar -> bX`, Physics Letters B, Vol.593, No.1-4, 189-197, 2004. (Summary) We study possible anomalous top-quark couplings generated by SU(2) x U(1) gauge invariant dimension-6 effective operators, using the final b-quark momentum distribution in gamma gamma -> tt -> bX. Taking into account non-standard tt gamma, tbW and gamma gamma H couplings, we perform an optimal-observable analysis in order to estimate the precision for the determination of all relevant non-standard couplings. (Link to Publication Site) ● Publication site (DOI): 10.1016/j.physletb.2004.04.075 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/j.physletb.2004.04.075 (DOI: 10.1016/j.physletb.2004.04.075)
6.	Bohdan Grzadkowski and Zenro Hioki : Decoupling of anomalous top-quark-decay vertices in angular distribution of secondary particles, Physics Letters B, Vol.557, No.1-2, 55-59, 2003. (Summary) Angular distribution of a secondary particle from top-quark decays is studied in a simple and general manner, paying careful attention to how relevant the top-quark production mechanism is. The conditions that lead to the distribution free from any possible anomalous top-quark decay interactions are specified. It is discussed how important the approximations adopted in earlier papers are. (Link to Publication Site) ● Publication site (DOI): 10.1016/S0370-2693(03)00187-4 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/S0370-2693(03)00187-4 (DOI: 10.1016/S0370-2693(03)00187-4)
7.	Bohdan Grzadkowski and Zenro Hioki : ANGULAR DISTRIBUTION OF LEPTONS IN GENERAL T ANTI-T PRODUCTION AND DECAY, Physics Letters B, Vol.529, No.1-2, 82-86, 2002. (Summary) Angular distribution of the secondary lepton in top-quark production followed by subsequent semi-leptonic decay is studied assuming general top-quark couplings. It is shown that the distribution does not depend on any possible anomalous tbW couplings and is determined only by the standard V-A decay vertex for any production mechanism if certain well-justified conditions are satisfied.
8.	Bohdan Grzadkowski and Zenro Hioki : NEW HINTS FOR TESTING ANOMALOUS TOP QUARK INTERACTIONS AT FUTURE LINEAR COLLIDERS, Physics Letters B, Vol.476, No.1-2, 87-94, 2000. (Summary) Angular and energy distributions for leptons and bottom quarks in the process e^+e^- --> t t-bar --> l^{+-}/b(b-bar) ... have been calculated assuming the most general top-quark couplings. The double distributions depend both on modification of the t t-bar production and t(t-bar) --> b(b-bar) W decay vertices. However, the leptonic angular distribution turned out to be totally insensitive to non-standard parts of Wtb vertex. Distributions of decay products for polarized top quark in its rest frame have been also calculated. It has been found that the factorization of energy and angular dependence for the double leptonic distribution noticed earlier for the Standard Model survives even if one allows for deviations from the V-A interactions, and the SM angular leptonic distribution turned out to be preserved by anomalous decay vertex. (Link to Publication Site) ● Publication site (DOI): 10.1016/S0370-2693(00)00101-5 (Link to Search Site for Scientific Articles) ● Summary page in Scopus @ Elsevier: 2-s2.0-0034624656 (DOI: 10.1016/S0370-2693(00)00101-5, Elsevier: Scopus)
9.	Bohdan Grzadkowski and Zenro Hioki : CP VIOLATING LEPTON ENERGY CORRELATION IN E- E+ ---> T ANTI-T, Physics Letters B, Vol.391, No.1-2, 172-176, 1997. (Summary) In order to observe a signal of possible CP violation in top-quark couplings, we have studied energy correlation of the final leptons in e^+e^- --> ttbar --> l^+l^-X / l^+- X at future linear colliders. Applying the recently-proposed optimal method, we have compared the statistical significances of CP-violation-parameter determination using double- and single-lepton distributions. We have found that the single-lepton-distribution analysis is more advantageous.
10.	Maurizio Consoli and Zenro Hioki : INDICATIONS ON THE HIGGS BOSON MASS FROM THE LEP DATA, Modern Physics Letters A, Vol.10, No.30, 2245-2252, 1995. (Summary) We update our previous analysis on the Higgs mass mh and the QCD coupling alpha_s(=alpha_s(Mz)) by using the LEP data after the 1995 Winter Conferences. For mt=180 GeV we find evidence for a rather large value of the Higgs mass in the range 500-1000 GeV, in agreement with the indications from the W mass.
11.	Maurizio Consoli and Zenro Hioki : REMARKS ON THE VALUE OF THE HIGGS MASS FROM THE PRESENT LEP DATA, Modern Physics Letters A, Vol.10, No.10, 845-852, 1995. (Summary) We perform a detailed comparison of the present LEP data with the one-loop standard-model predictions. It is pointed out that for mt= 174 GeV the ``bulk'' of the data prefers a rather large value of the Higgs mass in the range 500-1000 GeV, in agreement with the indications from the W mass. On the other hand, to accommodate a light Higgs it is crucial to include the more problematic data for the tau F-B asymmetry. We discuss further improvements on the data taking required to obtain a firm conclusion.
12.	Zenro Hioki and Ryuichi Najima : IS THE STANDARD ELECTROWEAK THEORY HAPPY WITH M(T) APPROXIMATELY 174-GEV?, Modern Physics Letters A, Vol.10, No.2, 121-124, 1995. (Summary) Based on the recent CDF report on the top-quark, we have carried out an analysis on the Higgs mass within the minimal standard electroweak theory using the latest data on the W-mass. Although this theory is in quite a happy situation now, we wish to point out that more precise measurements of Mw and mt in the future are crucial and they could come to require some new physics beyond it.
13.	Zenro Hioki : NONTRIVIAL TEST OF ELECTROWEAK QUANTUM EFFECTS, Physics Letters B, Vol.340, No.3, 181-184, 1994. (Summary) Based on recent W-mass measurements, the electroweak theory is tested at non-trivial quantum correction level, i.e., beyond the Born approximation with alpha(Mz) instead of alpha. We can conclude that some non-Born type corrections must exist at more than 92 % confidence level, and the non-decoupling top-quark corrections are required at 97 % confidence level.
14.	Zenro Hioki : POLARIZED LAMBDA(B) DECAY AND THE WEAK CURRENT STRUCTURE, Physics Letters B, Vol.303, No.1-2, 125-129, 1993. (Summary) b-c 荷電カレントのカイラル構造を調べるため，偏極した Λb の半レプトン崩壊幅を重クォーク有効理論を用いて計算した．この結果，終状態の電子のエネルギー分布を見ることが，この分析にとって重要であることが明らかになった．
15.	Zenro Hioki, Tsutom Hasuike, Toshihiko Hattori, Toshio Hayashi and Seiichi Wakaizumi : FACTORIZATION HYPOTHESIS FOR B NONLEPTONIC DECAYS WITHIN THE HEAVY QUARK EFFECTIVE THEORY, Physics Letters B, Vol.299, No.1-2, 115-122, 1993. (Summary) 重クォーク有効理論を用いてB中間子の非レプトン崩壊を調べ，通常の計算でしばしば用いられる遷移行列要素の「因子分解仮説」の有効性をテストした．そこではチャームクォークの質量の逆数の補正項まで取り入れ，同じBの半レプトン崩壊から決めたパラメータを用いた．その結果，少なくともこのBの崩壊に関しては，仮説は良い近似で成立していることがわかった．
16.	Zenro Hioki : TOP AND HIGGS HUNTING VIA M(W) AND GAMMA(Z), Modern Physics Letters A, Vol.6, No.23, 2129-2135, 1991. (Summary) Z ボソンの質量および崩壊幅に対する輻射補正を数値的に解析した．そこでは単に1ループの寄与だけではなく，対数項の足し上げも含めた式を用い，トップの質量を予測した．結果は，トップ質量が約 135 GeV というものである．
17.	Zenro Hioki : CLEAN TEST OF ELECTROWEAK QUANTUM EFFECTS INDEPENDENT OF LOW-ENERGY NEUTRAL CURRENT PROCESSES, Physical Review Letters, Vol.65, No.6, 683-685, 1990. (Summary) LEP において Z の質量が高精度で決定されたので，それを用いて電弱量子効果の精密解析を行なった．その結果，単に対数項を取り入れるだけでは実験値は再現できないこと，およびその他の微小な補正項を取り入れて初めて実験値を説明できることがわかった．これは更に一歩進んだ電弱理論の精密検証である．
18.	Zenro Hioki : THE FIRST PRECISE TEST OF THE ELECTROWEAK THEORY INDEPENDENT OF THE NEUTRINO EXPERIMENTS, Progress of Theoretical Physics, Vol.82, No.5, 875-878, 1989. (Summary) SLAC において SLC が稼動を始め，Z ボソンの質量が極めて正確に決定され，同時に W の質量も CDF により，これまで以上の精度で測定されたので，それらを用いて電弱輻射補正の分析を行なった．その結果，輻射補正を含めない W-Z 質量関係式は実験と矛盾する一方，輻射補正を含めたものはデータと非常によく一致することがわかった．これは電弱理論の，ニュートリノ実験に依存しない最初の精密検証である．
19.	Zenro Hioki : HEAVY FERMION CORRECTIONS TO HIGGS COUPLINGS REVISITED, Physics Letters B, Vol.224, No.4, 417-422, 1989. (Summary) ヒッグス粒子が含まれる結合に対する重いトップの輻射補正は，ヒッグス探しの実験において不可欠である．ところが既存の計算式はその Input のとり方が標準的ではないため，扱いが不便である．そこで現在の実験で得られるデータが直接使えるようなコンパクトな式を1ループ近似において導いた．
20.	Bohdan Grzadkowski, Zenro Hioki and Johann-Hans Kuehn : ON THE W BOSON MASS DETERMINATION IN THE TOTAL CROSS-SECTION OF E+ E- ---> W+ W- PROCESS, Physics Letters B, Vol.205, No.2-3, 388-392, 1988. (Summary) e^+e^- --> W^+W^- という反応を通じての W ボソン質量の測定について調べた．この断面積の大きさは，Input の選び方に強く依存するので，客観的な意味での質量測定が非常に難しいこと，しかしながら，この反応の立ち上がりの振舞いは不定性が小さく，結果として W の質量測定に適していることが見出された．
21.	Bohdan Grzadkowski and Zenro Hioki : LOGARITHMIC AND HEAVY QUARK CORRECTIONS TO E+ E- ---> W+ W- INCLUDING OFF-SHELL EFFECTS IN THE FINAL STATES, Physics Letters B, Vol.197, No.1-2, 213-219, 1987. (Summary) 電子-陽電子反応における W ボソン対生成に対する輻射補正を，対数項と重いトップクォークの寄与を取り出す近似を用いて計算した．特に，終状態の W ボソンの崩壊幅の影響について詳しく調べた．数値計算の際の Input としては Z ボソン質量を採用した．
22.	Zenro Hioki : ONE LOOP EFFECTS OF HEAVY SCALAR QUARKS IN SUPERSYMMETRIC ELECTROWEAK THEORY, Progress of Theoretical Physics, Vol.73, No.5, 1283-1286, 1985. (Summary) 超対称化された電弱理論における輻射補正を，スカラートップとスカラーボトムの質量差が大きい場合について調べた．結果として，この効果の W-Z 質量関係式への影響は，トップ-ボトムという二重項の場合と全く同じ形になることが見出された． (Link to Publication Site) ● Publication site (DOI): 10.1143/PTP.73.1283 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1143/PTP.73.1283 (DOI: 10.1143/PTP.73.1283)
23.	Zenro Hioki : MASS RELATION OF THE WEAK GAUGE BOSONS AS A CLEAN TEST OF ELECTROWEAK HIGHER ORDER EFFECTS, --- ANALYSIS INCLUDING LEADING LOG CORRECTIONS ---, Progress of Theoretical Physics, Vol.71, No.3, 663-665, 1984. (Summary) W-Z 質量関係式に対して対数補正項を取り入れる計算を行った．具体的には，繰り込み群を用いて摂動の全ての次数の寄与を足し上げ，対応する数値計算を行った．その結果，1ループ補正のみ加えた場合に比較して，理論的な不定性が著しく小さくなった． (Link to Publication Site) ● Publication site (DOI): 10.1143/PTP.71.663 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1143/PTP.71.663 (DOI: 10.1143/PTP.71.663)
24.	Francis Halzen, Zenro Hioki and Michiji Konuma : WHAT DO MEASUREMENTS OF M (W) AND M (Z) TELL US ABOUT THE TOP QUARK AND HIGGS BOSON MASSES?, Physics Letters B, Vol.126, No.1-2, 129-131, 1983. (Summary) 電弱高次効果における重いクォークの役割を，W-Z 質量関係式において調べた．この場合，通常の理論での重い粒子の寄与についての脱結合定理が成立せず，重いクォークの質量の2乗に比例する項が現れる．これにより，逆にその重いクォークの質量に実験データから制限を付けられることを示した． (Link to Publication Site) ● Publication site (DOI): 10.1016/0370-2693(83)90033-3 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1016/0370-2693(83)90033-3 (DOI: 10.1016/0370-2693(83)90033-3)
25.	Ken-Ichi Aoki, Zenro Hioki, Rokuo Kawabe, Michiji Konuma and Taizo Muta : ONE LOOP CORRECTIONS TO NEUTRINO E SCATTERING IN WEINBERG-SALAM THEORY, --- NEUTRAL CURRENT PROCESSES ---, Progress of Theoretical Physics, Vol.64, No.2, 707-710, 1980. (Summary) 電弱相互作用のワインバーグ·サラム理論の範囲内で，ニュートリノ-電子中性カレント反応に対する1ループ補正を調べた．計算は全て On-shell 繰り込み処方で進められ，結果は電荷および粒子の質量という直接観測可能な量で表されたため，非常に理解し易く見通しのよいものとなった． (Link to Publication Site) ● Publication site (DOI): 10.1143/PTP.64.707 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1143/PTP.64.707 (DOI: 10.1143/PTP.64.707)
26.	Zenro Hioki : ON THE CHARM PAIR PRODUCTION IN NEUTRINO N AND P N COLLISIONS, Progress of Theoretical Physics, Vol.62, No.3, 845-847, 1979. (Summary) ニュートリノ-核子および核子-核子反応におけるチャーム粒子対生成について分析した．特に，指摘されていた両方の反応での生成確率の不一致について調べ，パートン模型の適用可能範囲を守れば不一致は存在しないことを示した．
27.	Zenro Hioki : CONSTRAINTS ON THE MIXING ANGLE BETWEEN ORDINARY AND HEAVY LEPTONS IN A V-A MODEL, Progress of Theoretical Physics, Vol.58, No.2, 706-708, 1977. (Summary) クォーク·レプトンが8個以上存在する場合における粒子間混合の可能性を，純粋に左巻二重項のみを含む模型の範囲内で調べた．多くの実験データを総合的に分析すると，一見自由に決められるかのような混合角に厳しい制限がつくことを見出した．
28.	Zenro Hioki : SAME SIGN DIMUON EVENTS AND DELTA C NOT EQUAL TO 0 NEUTRAL CURRENT, Progress of Theoretical Physics, Vol.57, No.3, 1106-1107, 1977. (Summary) 先の論文で提案した模型の枠内で，特にνN -> μ^-μ^-X という反応を詳しく調べた．この模型にはチャーム量子数が変化する中性カレントが含まれており，それによりD^0-D^0bar 中間子混合の確率が大きくなる．これにより実験で報告されていた高い μ^-μ^- 生成確率をうまく説明することができた． (Link to Publication Site) ● Publication site (DOI): 10.1143/PTP.57.1106 (Link to Search Site for Scientific Articles) ● Search Scopus @ Elsevier (DOI): 10.1143/PTP.57.1106 (DOI: 10.1143/PTP.57.1106)
29.	Zenro Hioki : WEAK CURRENT MODEL WITH DELTA C NOT EQUAL TO 0 NEUTRAL CURRENT, Progress of Theoretical Physics, Vol.57, No.3, 1083-1085, 1977. (Summary) 高エネルギーニュートリノ-核子反応において報告されていた異常現象を説明するための模型を，SU(2)×U(1)ゲージ理論に基づき提案した．これは従来の粒子構成に加え，アップクォーク-チャームクォーク混合を含む右巻二重項を導入するもので，標準模型では理解できない現象をうまく説明することができた．

Review, Commentary:

1.	Zenro Hioki : Introduction to Dirac equation, --- Combining Quantum theory and Relativity ---, 数理科学, Vol.54, No.7, 7-13, Jul. 2016. (Summary) ディラック方程式への入門的解説であり，初心者が納得して本格的な教科書・参考書に取り組めるための手助けとなることを目指している． (Tokushima University Institutional Repository) ● Metadata: 119046 (Tokushima University Institutional Repository: 119046)
2.	Zenro Hioki : Ultimite structure of the nature, --- From atoms to fundamental particles ---, 数理科学, Vol.48, No.5, 54-59, May 2010. (Summary) 大学の新入生や大学物理にまだ慣れていない学部学生を主な読者対象として，現代科学はどこまで自然の微視的究極像に迫っているかを三つのキーワードの下に紹介する．限られた頁数の範囲内で数式を用いた細かい話を展開すると混乱が生じる恐れも少なくないため，定量的な解説よりもむしろ研究最前線の雰囲気を感じてもらうことを主眼とする．
3.	Zenro Hioki : 非物理系学生のための物理教育, Journal of University Education Research, Vol.3, 3-4, Mar. 2006. (Summary) 昔も今も難しいのは共通教育．特に，物理学は広範な自然科学分野の基礎と言われつつも，学生に最も敬遠される科目の一つに数えられている．そのような多くの「物理嫌い学生」に物理への興味・関心を持たせ基本的な学力を身につけさせるにはどうすればいいのか．私自身も明確な答えは持っていないが，自らの講義内容を紹介することで意見交換の端緒・材料としたい．
4.	Zenro Hioki : 一地方大学の物理教育, Physics Education in University, Vol.97-1, No.8, 25-28, Mar. 1997.
5.	Zenro Hioki : 弱電磁量子効果とそれを通じての Top/Higgs 探し, BUTSURI, Vol.46, No.10, 843-849, Oct. 1991.
6.	Zenro Hioki : 弱電磁ゲージ理論:精密解析の現状 1991, Soryushiron Kenkyu Electronics, Vol.83, No.3, C3-C7, Jun. 1991.
7.	Zenro Hioki : Electroweak 理論はどこまでテストされたか?, Soryushiron Kenkyu Electronics, Vol.81, No.5, E4-E8, Aug. 1990.
8.	Zenro Hioki and Michiji Konuma : 電弱相互作用による輻射補正, Soryushiron Kenkyu Electronics, Vol.67, No.3, C63-C78, Jun. 1983.
9.	Ken-Ichi Aoki and Zenro Hioki : 弱·電磁相互作用の高次効果とウィークボソンの質量, BUTSURI, Vol.38, No.2, 121-124, Feb. 1983.
10.	Zenro Hioki : 高エネルギーνN反応の現状, Soryushiron Kenkyu Electronics, Vol.58, No.5, 207-238, May 1979.
11.	Noboru Sasao, Zenro Hioki and Taizo Muta : 中性弱カレント及びチャーム粒子の発見, 数理科学, 61-76, Apr. 1979.
12.	Noboru Sasao, Zenro Hioki and Taizo Muta : ハドロンの構造とクォーク間相互作用, 数理科学, 46-60, Apr. 1979.
13.	Zenro Hioki : Lepton-Hadron および Hadron-Hadron 反応と QCD-improved Parton Model, Soryushiron Kenkyu Electronics, Vol.56, No.5, 155-184, Feb. 1978.

Proceeding of International Conference:

1.	Zenro Hioki, Kazumasa Ohkuma and Akira Uejima : Constraints on generalized nonstandard tbW couplings, 38th International Conference on High Energy Physics, Chicago, Aug. 2016. (Summary) The most general analysis of top-bottom-W boson (tbW) interactions is performed based on an effective lagrangian constructed by dimension 6 effective operators invariant under SU(3)xSU(2)xU(1) symmetry. Since the lagrangian includes four kinds of effective operators, four kinds of nonstandard couplings parameterizing contributions from those operators exist, which are generally complex numbers. We estimate constraints on those nonstandard couplings coming from current experimental data for top-decay processes. As a result, we find that those constraints are not so strong yet because cancellations occur among some of contributions from those nonstandard couplings. (Keyword) Top quark / Anomalous tbW couplings / LHC
2.	Zenro Hioki and Kazumasa Ohkuma : Constraints on nonstandard top-gluon couplings from the Tevatron, LHC7 and LHC8, PASCOS 2013: 19th International Symposium on Particles, Strings, and Cosmology, Taipei, Nov. 2013. (Summary) Through top-quark pair productions at Tevatron/LHC, we study possible effects of anomalous top-gluon couplings yielded by SU(3)xSU(2)xU(1) invariant dimension-6 effective operators. We calculate the total cross section and also some distributions for pp/ppbar -> ttbar X as functions of two anomalous-coupling parameters, i.e., the chromoelectric and chromomagnetic moments of the top. We show that we get a much stronger constraint on these couplings by combining the Tevatron and LHC data than the one from Tevatron data alone. (Keyword) Top quark / Anomalous QCD couplings / LHC / Tevatron
3.	Zenro Hioki and Kazumasa Ohkuma : Probing non-standard top-quark couplings via optimal-observable analyses at LHC, Hadron Collider Physics Symposium 2012, Kyoto, Nov. 2012.
4.	Zenro Hioki and Kazumasa Ohkuma : Studying anomalous top-gluon interactions at hadron colliders, German-Japanese Workshop: Modern Trends in Quantum Chromodynamics, Zeuthen, Oct. 2011. (Summary) Through top-quark pair productions at Tevatron/LHC, we study possible effects of anomalous top-gluon couplings yielded by SU(3)xSU(2)xU(1) invariant dimension-6 effective operators. We calculate the total cross section and also some distributions for pp/ppbar -> ttbar X as functions of two anomalous-coupling parameters, i.e., the chromoelectric and chromomagnetic moments of the top. We show that we get a much stronger constraint on these couplings by combining the Tevatron and LHC data than the one from Tevatron data alone. (Keyword) Top quark / Anomalous QCD couplings / LHC / Tevatron
5.	Zenro Hioki and Kazumasa Ohkuma : Model-independent study of neutral Higgs sector via tt productions at muon colliders, Scalars 2011, Warsaw, Aug. 2011.
6.	Zenro Hioki and Kazumasa Ohkuma : Studying anomalous top-gluon couplings at Tevatron/LHC, Portoroz 2011: The Role of Heavy Fermions in Fundamental Physics, Portoroz, Apr. 2011. (Summary) Through top-quark pair productions at Tevatron/LHC, we study possible effects of anomalous top-gluon couplings yielded by SU(3)xSU(2)xU(1) invariant dimension-6 effective operators. We calculate the total cross section and also some distributions for pp/ppbar -> ttbar X as functions of two anomalous-coupling parameters, i.e., the chromoelectric and chromomagnetic moments of the top. We show that we get a much stronger constraint on these couplings by combining the Tevatron and LHC data than the one from Tevatron data alone. (Keyword) Top quark / Anomalous QCD couplings / LHC / Tevatron
7.	Zenro Hioki and Kazumasa Ohkuma : Probing non-standard top-gluon couplings at hadron colliders, KEK Theory Meeting (KEK-PH2010) on Particle Physics Phenomenology, Tsukuba, Feb. 2010. (Keyword) Top quark / Anomalous QCD couplings / LHC
8.	Zenro Hioki, Kazumasa Ohkuma, Bohdan Grzadkowski and Jose Wudka : Study of non-standard top-quark couplings at ILC, Joint Meeting of Pacific Region Particle Physics Communities, Sheraton Waikiki Hotel, Honolulu, Hawaii (Oahu), Nov. 2006. (Summary) We perform an optimal-observable analysis of the final charged-lepton momentum distributions in ee-bar -> tt-bar -> l X and gamma gamma -> tt-bar -> l X for various beam polarizations in order to study possible anomalous top-quark couplings, which could be generated by SU(2)xU(1) gauge-invariant dimension-6 effective operators. We also compare electron-positron and photon photon colliders from the viewpoint of the anomalous top quark coupling determination. (Keyword) Top quark / Higgs boson / International Linear Collider
9.	Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Jose Wudka : NEW-PHYSICS SEARCH THROUGH GAMMA GAMMA -> t tbar -> lX/bX, Nuclear Physics B - Proceedings Supplements, Vol.157, No.1, 246-250, Amsterdam, Jul. 2006. (Summary) We probe optimal beam polarizations for new-physics search in top-quark and Higgs-boson sectors at Photon Linear Colliders (PLC). Expressing possible non-standard effects generated by SU(2)xU(1) gauge-invariant dimension-6 effective operators as anomalous top and Higgs couplings, we estimate expected statistical sensitivities of these couplings in gamma gamma -> t tbar -> lX/bX, using the optimal-observable method.
10.	Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Jose Wudka : NEW PHYSICS AT THE TOP, Acta Physica Polonica B, Vol.37, No.4, 1085-1091, Cracow, Apr. 2006. (Summary) We consider the possibility of using t tbar production at photon colliders as a probe for physics beyond the Standard Model. The angular and energy distributions of top-quark decay products are employed in the analysis that determines the accuracy with which the new-physics parameters can be measured.
11.	Zenro Hioki : WHAT WILL LC TELL US ON TOP/QCD ?, Proceedings of 7th International Conference on Linear Colliders (LCWS 2004), 321-324, Paris, Oct. 2004. (Summary) Current status of Top/QCD studies is briefly reviewed, classifying topics into two categories: those within the standard model and those beyond the standard model.
12.	Zenro Hioki : New-Physics Search in gamma gamma --> ttbar, Proceedings of 7th International Conference on Linear Colliders (LCWS 2004), 493-495, Paris, Oct. 2004. (Summary) Possible anomalous top-quark couplings generated by SU(2)xU(1) gauge-invariant dimension-6 effective operators are studied via optimal-observable procedure, using the final lepton/b-quark momentum distribution in gamma gamma --> ttbar --> l / b X. The precision for determining non-standard ttbar gamma, tbW and gamma gamma H couplings is estimated.
13.	Zenro Hioki : A NEW DECOUPLING THEOREM IN TOP QUARK PHYSICS, Proceedings of 6th International Workshop on Linear Colliders (LCWS 2002), 333-338, Seoul, Jul. 2003. (Summary) Angular distribution of a secondary particle in top-quark production/decay is studied in a simple and general manner. It is shown that the distribution does not depend on any possible anomalous top-quark-decay interactions whatever the production mechanism is when certain well-justified conditions are satisfied. Some analyses using the final- state lepton are presented as an example of its application.
14.	Katsumasa Ikematsu, Tohru Takahashi, Takaaki Nagano, Yukinari Sumino, Keisuke Fujii and Zenro Hioki : SIMULATION STUDY OF TOP QUARK RECONSTRUCTION NEAR THE T ANTI-T THRESHOLD, Proceedings of 5th International Linear Collider Workshop (LCWS 2000), 336-339, New York, Apr. 2001.
15.	Zenro Hioki : PROBING ANOMALOUS TOP COUPLINGS THROUGH THE FINAL LEPTON ANGULAR AND ENERGY DISTRIBUTIONS AT POLARIZED NLC, Proceedings of Theory Workshop on Physics at Linear Colliders, 169-177, Tsukuba, Mar. 2001.
16.	Bohdan Grzadkowski and Zenro Hioki : SIGNALS OF CP VIOLATION IN DISTRIBUTIONS OF TOP-QUARK DECAY PRODUCTS AT LINEAR COLLIDERS, Proceedings of 7th International Symposium on Particles, Strings and Cosmology (PASCOS 99), 189-193, Singapore, Jul. 2000.
17.	Zenro Hioki : PROBING ANOMALOUS TOP-COUPLINGS AT POLARIZED LINEAR COLLIDER, Proceedings of 4th International Workshop on Linear Colliders (LCWS 99), 270-275, Barcelona, May 2000.
18.	Bohdan Grzadkowski and Zenro Hioki : PROBING CP VIOLATION VIA TOP POLARIZATION AT NLC, Proceedings of the Circum-Pan-Pacific Workshop on High-Energy Spin Physics '96, 183-187, Kobe, May 1997.
19.	Zenro Hioki : EW PRECISION ANALYSIS AND THE HIGGS MASS, Acta Physica Polonica B, Vol.27, No.10, 2573-2582, Cracow, Oct. 1996. (Summary) Two topics on the standard electroweak theory are discussed based on its remarkable success in precision analyses. One is a test of structure of the radiative corrections to the weak-boson masses as a further precision analysis. The other is an indirect Higgs-boson search through the radiative corrections to the various quantities measured at LEP.
20.	Zenro Hioki : STRUCTURE OF ELECTROWEAK RADIATIVE CORRECTIONS, Acta Physica Polonica B, Vol.27, No.7, 1569-1579, Cracow, Jul. 1996. (Summary) Looking into the inside of radiative corrections is an interesting subject as a deeper study of the standard electroweak theory after its remarkable success in the precision analyses. I will discuss here a test of ``structure" of the EW radiative corrections to the weak-boson masses, and show that we can now analyze several different parts separately.
21.	Zenro Hioki : ELECTROWEAK PRECISION TESTS VIA W / Z MASSES, Proceedings of the International Workshop on Electroweak Symmetry Breaking, 159-164, Singapore, Apr. 1992.
22.	Zenro Hioki : TESTING QUANTUM ELECTROWEAK EFFECTS: ROLE OF THE WEAK BOSON MASSES, Proceedings of the XII Warsaw Symposium on Elementary Particle Physics, 265-273, Singapore, Jul. 1990.
23.	Zenro Hioki : TESTS OF THE STANDARD MODEL: SUMMARY, Proceedings of the XII Warsaw Symposium on Elementary Particle Physics, 629-633, Singapore, Jul. 1990.
24.	Zenro Hioki : INTRODUCTION TO HIGHER ORDER ANALYSIS OF THE ELECTROWEAK INTERACTION, Acta Physica Polonica B, Vol.17, No.12, 1037-1084, Cracow, Dec. 1986. (Summary) SU(2)×U(1) 電弱理論における高次補正の計算方法について詳しい解説を行った．いくつかの反応に対する1ループ補正の式を全て具体的に与え，また，それらに対する近似式を導き，さらに W，Z 質量関係式との関連について論じた．
25.	Zenro Hioki : CLEAN TEST OF THE ELECTROWEAK THEORY BY MEASURING WEAK BOSON MASSES, Proceedings of the Int. Symp. on Physics of Proton-Antiproton Collision, 223-251, Tsukuba, Oct. 1985.

Proceeding of Domestic Conference:

1.	Kazumasa Ohkuma, Akira Uejima and Zenro Hioki : Possible extension of tbW couplings in the framework of effective Lagrangian, 日本物理学会年次大会, Mar. 2017. (Summary) 可能な限り特定の模型に依存しないように拡張した有効ラグランジアンを用いて，t --> b W 崩壊過程に関連する理論値と実験値との比較から，トップ-ボトム-Wボソン(tbW)相互作用の拡張制限を与えた．
2.	Kazumasa Ohkuma and Zenro Hioki : Model-independent analysis of generalized tbW couplings, 日本物理学会年次大会, Mar. 2016. (Summary) SU(3)×SU(2)×U(1)ゲージ対称性を持つ次元6の有効ラグランジアンによって拡張されるトップクォーク‐ボトムクォーク‐Wボソン(tbW)相互作用は，4種類あるが，それらの結合定数は，一般的に複素数が許される．しかしながら，これまでの解析の多くは，それらは，実数として解析されている．そこで，今回，それらの結合定数を複素数として扱った場合，現在の実験結果は，それらに程度の制限を与えているのかを調べた．
3.	Zenro Hioki : トップ生成・崩壊における脱結合定理の視覚的理解, 研究会「四国セミナー」, Dec. 2015. (Summary) I revisit here the decoupling theorem in top-quark productions/decays, which states that the angular distribution of any final-particle produced in those processes does not depend on any possible nonstandard top-quark decay interactions at their leading order when certain conditions are satisfied. Towards a simple, intuitive and visual understanding of this theorem, I will study to what extent we could explain why such a theorem holds without relying on any specific/detailed calculations.
4.	Kazumasa Ohkuma and Zenro Hioki : Analyzing the lepton angular distribution in top-quark productions/decays at the LHC, 日本物理学会年次大会, Mar. 2015. (Summary) SU(3)×SU(2)×U(1)ゲージ対称性を持つ次元6の有効演算子からなるラグランジアンによって拡張された非標準トップクォーク‐ボトムクォーク‐Wボソン(tbW)結合を，トップクォーク崩壊レプトンの角度分布を利用するして測定する際のレプトン横運動量カットオフと測定精度の関係を最適観測量解析(Optimal Observable Analysis)を利用して評価する．
5.	Kazumasa Ohkuma and Zenro Hioki : LHC実験でのトップ生成・崩壊におけるレプトン角分布と脱結合定理, 研究会「四国セミナー」, Dec. 2014. (Summary) LHC 実験でのトップ生成・崩壊におけるレプトン角分布を解析し，非標準トップ結合に関して脱結合定理の制限を受けない手法を報告する．
6.	Kazumasa Ohkuma and Zenro Hioki : Probing anomalous top-quark interactions via the angular distribution of the lepton from top-decays, 日本物理学会秋季大会, Sep. 2014. (Summary) LHCにおけるトップクォーク対生成・半レプトン崩壊過程に注目し，終状態荷電レプトン角分布を通じて，そこで観測される可能性がある非標準ttg結合及びtbW結合の観測精度を最適観測量解析を用いて見積もり議論する．
7.	Kazumasa Ohkuma and Zenro Hioki : 非標準トップクォーク-グルーオン結合に対するTevatron及びLHC実験からの制限付け, 研究会「四国セミナー」, Dec. 2013. (Summary) TevatronとLHC のデータを用いてのトップ-グルーオン結合の拡張とその制限付けの可能性につき検討する．
8.	Kazumasa Ohkuma and Zenro Hioki : Constraints on nonstandard top-quark--gluon couplings by hadron colliders, 日本物理学会年次大会, Mar. 2013. (Summary) TevatronとLHC(7TeVと8TeV)におけるトップクォーク対生成過程の観測結果から，非標準的な相互作用の起源となるトップクォークのchromomagnetic dipole moments (CMDM) と chromoelectric-dipole moments(CEDM)の現在の制限範囲とその結果から推定できる新しい物理スケールについて発表する．
9.	Kazumasa Ohkuma and Zenro Hioki : Optimal-observable analysis of nonstandard top-quark couplings at LHC, 日本物理学会秋季大会, Sep. 2012. (Summary) LHCにおけるトップクォーク対生成および崩壊過程に注目し，そこで観測される可能性がある非標準ttg結合及びtbW結合の観測精度を最適観測量解析を用いて見積もり議論する．
10.	Zenro Hioki and Kazumasa Ohkuma : Analysis of non-standard top-quark interactions based on the effective Lagrangian, 研究会「素粒子物理学の進展2012」, Jul. 2012. (Summary) 標準模型の枠組みを低エネルギー有効理論として含み，標準模型を超える相互作用は，標準粒子から構成され，SU(3)×SU(2)×U(1)対称性を持つような高次の有効演算子によって記述されるとする有効ラグランジアンを用いて，トップクォーク相互作用の拡張とその制限について調べた結果を報告する．発表では，Z. Hioki and KO Phys. Rev. D83 (2011)114045の発展として，現在行っているOptimal-observable analysis による解析結果も加えて報告したい．
11.	Kazumasa Ohkuma and Zenro Hioki : Constraints on extended top-quark--gluon couplings by Tevatron and LHC, 日本物理学会年次大会, Mar. 2012. (Summary) TevatronとLHCから発表された最新の実験結果を基に行った非標準トップ-グル―オン相互作用の結合の大きさに対する制限付けの更新結果を紹介する．そして，それらの結果から，新しい物理のエネルギースケール(New Physics Scale)について検討する．
12.	Kazumasa Ohkuma and Zenro Hioki : Observability of nonstandard top-quark interaction at hadron colliders, 日本物理学会秋季大会, Sep. 2011. (Summary) TevatronとLHCの実験結果を基に行った非標準トップ-グル―オン相互作用の結合の大きさに対する制限付け結果を紹介する．そして，その制限付けのを考慮した上で，TevatronとLHCにおいて，非標準トップ-グル―オン結合及び非標準トップ-ボトム-Wボソンが観測される可能性を吟味する．
13.	Kazumasa Ohkuma and Zenro Hioki : Constraints on nonstandard top-quark couplings by Tevatron and LHC, 日本物理学会年次大会, Mar. 2011. (Summary) Effective Lagrangian を用いた比較的特定の模型に依存しない解析方法を採用し，Tevatron と LHC でのトップクォーク対生成の観測結果から，許される非標準的な ttg 結合の大きさの範囲を求めた．
14.	Zenro Hioki and Kazumasa Ohkuma : Exploring nonstandard top-quark interaction and limit on it at hadron colliders, 研究会「素粒子物理学の進展2011」, Mar. 2011. (Summary) ハドロン衝突型加速器TevatronとLHCにおいて，非標準的なトップクォーク結合存在の可能性およびそれに対する制限を探る．
15.	Kazumasa Ohkuma and Zenro Hioki : Exploring possible extension of top-gluon couplings and constraints on it at Tevatron and LHC, 研究会「四国セミナー」, Dec. 2010. (Summary) TevatronとLHC のデータを用いてのトップ-グルーオン結合の拡張とその制限付けの可能性につき検討する．
16.	Fujii Kenji, Ishiba Toshihiko, Kazumasa Ohkuma and Zenro Hioki : Single top productions through nonstandard top-gluon couplings, --- gluon-gluon collisions ---, 研究会「四国セミナー」, Dec. 2010. (Summary) 非標準トップ-グルオン結合を通じてのシングルトップ生成を Tevatron エネルギーにおいて調べ，断面積を数値的に与えた．
17.	Kazumasa Ohkuma and Zenro Hioki : ハドロン衝突におけるトップの半レプトン崩壊と非標準相互作用, 日本物理学会秋季大会, Sep. 2010.
18.	Kazumasa Ohkuma and Zenro Hioki : LHC実験における非標準的なトップ-グルーオン結合の観測可能性, 日本物理学会年次大会, Mar. 2010. (Summary) Effective Lagrangian を用いた比較的特定の模型に依存しない解析方法を採用し，Tevatron でのトップクォーク対生成の観測結果から，許される非標準的な ttg 結合の大きさの範囲を求め，その制限から LHC 実験での非標準 ttg 結合の観測可能性を議論する．
19.	Ishiba Toshihiko, Kazumasa Ohkuma, Zenro Hioki and Fujii Kenji : Non-standard top-gluon couplings at Tevatron and LHC, --- Flavor-changing interaction and single top-quark production at Tevatron ---, 研究会「四国セミナー」, Dec. 2009.
20.	Kazumasa Ohkuma and Zenro Hioki : Non-standard top-gluon couplings at Tevatron and LHC, 研究会「四国セミナー」, Dec. 2009.
21.	Kazumasa Ohkuma and Zenro Hioki : LHCにおける非標準トップ-グルオン結合の探索, 日本物理学会秋季大会, Sep. 2009.
22.	Kazumasa Ohkuma, Zenro Hioki and Takuya Konishi : ミューオンコライダーにおけるトップクォーク対生成と非標準ヒッグス相互作用, 日本物理学会年次大会, Sep. 2007.
23.	Zenro Hioki, Kazumasa Ohkuma and Takuya Konishi : ミューオンコライダーにおけるトップクォーク対生成とCP非保存ヒッグス相互作用, 日本物理学会春季大会, Mar. 2007.
24.	Kazumasa Ohkuma, Takuya Konishi and Zenro Hioki : ミューオンコライダーでの非標準ヒッグス相互作用の探索, 研究会「四国セミナー」, Dec. 2006.
25.	Kazumasa Ohkuma, Bohdan Grzadkowski, Zenro Hioki and Jose Wudka : γγ --> t tbar --> l X / b X過程から探る非標準相互作用, 日本物理学会年次大会, Mar. 2006.
26.	Kazumasa Ohkuma, Bohdan Grzadkowski, Zenro Hioki and Jose Wudka : Probing Optimal Beam Polarization for New-Physics Search at ILC, 研究会「四国セミナー」, Dec. 2005.
27.	Kazumasa Ohkuma, Bohdan Grzadkowski, Zenro Hioki and Jose Wudka : Top Quark Interactions and Search for New Physics, 研究会「四国セミナー」, Dec. 2004.
28.	Kazumasa Ohkuma, Bohdan Grzadkowski, Zenro Hioki and Jose Wudka : 光子光子散乱によって生成されるトップクォークと非標準相互作用, 日本物理学会秋季大会, Sep. 2004.
29.	Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Jose Wudka : Optimal-observable analysis of top production/decay at photon-photon collider, 研究会「素粒子物理学の進展」, Jun. 2004. (Summary) リニアコライダーでの光子光子衝突においてトップ対生成崩壊を考え，その結果を最適観測量解析法により調べる．幾つかの任意パラメータは，始状態の電子·光子の偏極の操作により測定可能であることを示す．
30.	Zenro Hioki, Bohdan Grzadkowski, Kazumasa Ohkuma and Jose Wudka : 光子光子衝突でのトップ対生成による最適観測量解析, 日本物理学会年次大会, Mar. 2004.
31.	Kazumasa Ohkuma, Bohdan Grzadkowski, Zenro Hioki and Jose Wudka : 光子-光子衝突実験におけるトップクォーク生成·崩壊と非標準相互作用, 日本物理学会秋季大会, Sep. 2003.
32.	Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Jose Wudka : 次元6演算子によるトップクォーク結合の光子光子衝突における検証, 研究会「素粒子物理学の進展」, Jul. 2003. (Summary) エネルギースケールΛ(>> Mw)の New Physics を仮定すると，Λ以下の世界には，それによる非標準相互作用が幾つか現れる．特に，トップクォーク結合には，他のフェルミオンに比較して実際の実験データによる制限があまりついていないため，それらの演算子が寄与できる余地がある．ここでは，そのような非標準トップ結合を，光子光子衝突におけるトップ対生成を通じて調べてみた．
33.	Bohdan Grzadkowski and Zenro Hioki : トップ生成·崩壊における脱結合定理, 研究会「四国セミナー」, Apr. 2003.
34.	Bohdan Grzadkowski and Zenro Hioki : A decoupling theorem in top-quark production and decay, Workshop : Particle Physics at High Energy Frontier, Mar. 2003.
35.	Bohdan Grzadkowski and Zenro Hioki : トップクォークについての新しい脱結合定理, 日本物理学会秋季大会, Sep. 2002.
36.	Bohdan Grzadkowski and Zenro Hioki : トップの物理における新しい脱結合定理, 研究会「素粒子物理学の進展」, Jul. 2002.
37.	Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Jose Wudka : Effects of Non-Standard Top Decay at Photon-Photon Collider, 研究会「四国セミナー」, Apr. 2002.
38.	Katsumasa Ikematsu, Yukinari Sumino, tohru Takahashi, Keisuke Fujii and Zenro Hioki : 電子·陽電子リニアコライダー実験の t t-bar 閾値領域における CP 非保存観測量, 日本物理学会年次大会, Mar. 2002.
39.	Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Jose Wudka : 光子光子衝突におけるトップ対生成·崩壊過程での CP の破れ, 日本物理学会年次大会, Mar. 2002.
40.	Bohdan Grzadkowski, Zenro Hioki and Kazumasa Ohkuma : 光子光子衝突における CP 非保存トップ対生成, 日本物理学会秋季大会, Sep. 2001.
41.	Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Jose Wudka : 光子·光子衝突でのトップ対生成と CP の破れ, 研究会「新世紀の素粒子像」, Jul. 2001.
42.	Bohdan Grzadkowski and Zenro Hioki : トップ対生成·崩壊における非標準相互作用と終状態レプトンの角分布, 日本物理学会年次大会, Sep. 2000.
43.	Katsumasa Ikematsu, Yukinari Sumino, tohru Takahashi, Takaaki Nagano, Keisuke Fujii and Zenro Hioki : 電子·陽電子リニアコライダー実験におけるトップクォーク対生成事象の再構築, 日本物理学会年次大会, Sep. 2000.
44.	Bohdan Grzadkowski and Zenro Hioki : e+e- -> t t-bar での終状態レプトンの運動量分布, 研究会「素粒子物理学の新展開」, Jul. 2000.
45.	Katsumasa Ikematsu, Yukinari Sumino, tohru Takahashi, Takaaki Nagano, Keisuke Fujii and Zenro Hioki : 電子陽電子リニアコライダー実験のトップクォーク対生成事象におけるCP非保存量の測定可能性, 日本物理学会春季大会, Apr. 2000.
46.	Bohdan Grzadkowski, Zenro Hioki and Michal Szafranski : Probing Four-Fermi-Interaction Effects at NLC, 研究会「素粒子物理学の新展開」, Jul. 1999.
47.	Bohdan Grzadkowski and Zenro Hioki : 偏極電子ビームによるトップ結合の解析, 研究会「素粒子物理学の新展開」, Jun. 1998.
48.	Zenro Hioki and Kazumasa Ohkuma : トップ擬スカラー結合を通じての CP 非対称性について, 研究会「四国セミナー」, Apr. 1998.
49.	Longin Brzezinski, Bohdan Grzadkowski, Zenro Hioki, Kazumasa Ohkuma and Michal Szafranski : トップ対生成における非標準相互作用の効果, 日本物理学会年次大会, Mar. 1998.
50.	Zenro Hioki and Kazumasa Ohkuma : トップ擬スカラー結合を通じての CP 非対称性について, 研究会「フレーバーの物理とその周辺」, Jan. 1998.
51.	Bohdan Grzadkowski and Zenro Hioki : トップ相互作用中のCP非保存パラメータの測定, 日本物理学会年次大会, Mar. 1997.
52.	Bohdan Grzadkowski and Zenro Hioki : Testing CP Violation in Top Couplings at NLC, 研究会「フレーバーの物理とその周辺」, Jan. 1997.
53.	Bohdan Grzadkowski and Zenro Hioki : トップ生成·崩壊におけるCPの破れ, 日本物理学会秋季大会, Oct. 1996.
54.	Zenro Hioki : Top News in Particle Physics, 研究会「四国セミナー」, Apr. 1995.
55.	Zenro Hioki : 電弱輻射補正の微細構造, 日本物理学会年次大会, Mar. 1995.
56.	Zenro Hioki : W の質量に対する電弱補正の構造, 研究会「素粒子物理とその将来像」, Jan. 1995.
57.	Zenro Hioki : Non-trivial Tests of EW Corrections via alpha, G_F and M_W,Z, 研究会「線型加速器における e⁺e^-, e^-γ および γγ 衝突の物理」, Dec. 1994.
58.	Tsutom Hasuike, Toshihiko Hattori, Toshio Hayashi, Zenro Hioki and Seiichi Wakaizumi : D 粒子のノンレプトニック崩壊における質量補正, 日本物理学会年次大会, Mar. 1994.
59.	Zenro Hioki : `B→D^(*)D_s` 崩壊による `f_{D_s}` 測定, 日本物理学会年次大会, Mar. 1994.
60.	Zenro Hioki : `B→D^(*)D_s` による `f_{D_s}` 測定と `O(1/m_c)` 補正, 研究会「素粒子物理とその将来像」, Jan. 1994.
61.	Zenro Hioki : 偏極 Λ_b 崩壊と b-c カレントの V, A 構造, 研究会「四国セミナー」, Apr. 1993.
62.	Zenro Hioki : 偏極Λ_b 崩壊と b-c カレントの V, A 構造, 日本物理学会年次大会, Apr. 1993.
63.	Zenro Hioki : 重クォーク有効理論による Λ_b レプトン崩壊の分析, 研究会「素粒子論における現象論の展開」, Jan. 1993.
64.	Zenro Hioki, Tsutom Hasuike, Toshihiko Hattori, Toshio Hayashi and Seiichi Wakaizumi : 重いクォークの有効理論による非レプトン B^0 崩壊の分析, 研究会「B, D, K 中間子物理とクォーク混合,CP の破れ」, Aug. 1992.
65.	Zenro Hioki : 輻射補正と新しい物理, 研究会「四国セミナー」, Apr. 1992.
66.	Zenro Hioki : 電弱精密解析と新しい物理の可能性, 日本物理学会年次大会, Mar. 1992.
67.	Zenro Hioki : Unambiguous Test of Non-Decoupling Top Corrections, 研究会「第3回JLC Workshop」, Feb. 1992.
68.	Zenro Hioki : 弱電磁輻射補正における重いトップクォークの効果 II, 日本物理学会年次大会, Mar. 1991.
69.	Zenro Hioki : Loop 効果による Top, Higgs 探し, 研究会「四国セミナー」, Dec. 1990.
70.	Zenro Hioki : 弱電磁輻射補正における重いトップクォークの効果, 日本物理学会秋季大会, Oct. 1990.
71.	Zenro Hioki : Effects of Heavy Fermions in Higgs Couplings, 研究会「第1回JLC Workshop」, Oct. 1989.
72.	Zenro Hioki : ヒッグス結合における重いフェルミオンの効果, 日本物理学会秋季大会, Oct. 1989.
73.	Zenro Hioki : 弱電磁ゲージ理論とトリスタン, 日本物理学会秋季大会, Oct. 1989.
74.	Zenro Hioki : Verification of the Quantum Electroweak Effects through the Weak Boson Mass Relation, 研究会「第3回TeV領域の物理」, Sep. 1989.
75.	Bohdan Grzadkowski, Zenro Hioki and Johann-Hans Kuehn : e^+ e^-→W^+ W^- 反応における Mw 測定, 日本物理学会秋季大会, Oct. 1988.
76.	Zenro Hioki : Testing the Standard Electroweak Theory through the Measurement of sigma_tot(e⁺ e^- →W⁺ W^-), 研究会「第2回TeV領域の物理」, May 1988.
77.	Zenro Hioki : e^+ e^- →W^+ W^- の全断面積測定と標準理論のテスト, 研究会「第47回広島セミナー」, May 1987.
78.	Zenro Hioki : 輻射補正における重いスカラークォークの効果, 研究会「超高エネルギーレプトン反応における弱電磁相互作用の高次効果」, Nov. 1985.
79.	Zenro Hioki : 超対称弱電磁理論における重いスカラークォークの効果, 研究会「四国セミナー」, Mar. 1985.
80.	Zenro Hioki : Toward Clean Tests of the Electroweak Higher Order Effects, 研究会「第21回広島セミナー」, Dec. 1984.
81.	Zenro Hioki : Heavy particle and Mw-Mz relation, 日本物理学会年次大会, Apr. 1984.
82.	Zenro Hioki : Proton Decay in Grand Unified Theories, 研究会「大統一理論と宇宙物理」, Dec. 1983.
83.	Francis Halzen, Zenro Hioki and Michiji Konuma : Mw,Mz の精密測定と Top-quark mass, 日本物理学会秋季大会, Oct. 1983.
84.	Zenro Hioki, Shoichi Midorikawa and Hiroyuki Nishiura : レプトン-核子深非弾性散乱におけるヒッグス粒子生成, 研究会「クォーク·グルオンの力学に基づくハドロン物理」, Nov. 1982.
85.	Zenro Hioki, Shoichi Midorikawa and Hiroyuki Nishiura : レプトン-核子深非弾性散乱におけるヒッグス粒子生成, 日本物理学会年次大会, Sep. 1982.
86.	Zenro Hioki : Higher order effects of electroweak interaction, 日本物理学会春季大会, Apr. 1982. (Summary) 電弱相互作用の高次効果の研究の現状について，特にW，Zの質量に対する輻射補正および質量殻上繰り込み処方に重点をおいて講演した．
87.	Zenro Hioki : Hard Bremsstrahlung Effects in Purely Leptonic Weak Processes, 研究会「ゲージ理論にもとづく数10 GeV領域の現象論」, Dec. 1981.
88.	Zenro Hioki : Hard Bremsstrahlung Effects in Purely Leptonic Weak Processes, 研究会「統一ゲージ理論」, Dec. 1981.
89.	Ken-Ichi Aoki and Zenro Hioki : Hard photon emission in high energy nu e scatterings, 日本物理学会秋季大会, Oct. 1981.
90.	Ken-Ichi Aoki, Zenro Hioki, Rokuo Kawabe, Michiji Konuma and Taizo Muta : Electroweak Radiative Corrections to Pure Leptonic Processes, 研究会「統一ゲージ模型」, Feb. 1981.
91.	Ken-Ichi Aoki, Zenro Hioki, Rokuo Kawabe, Michiji Konuma and Taizo Muta : Electroweak Radiative Corrections to High Energy nu e Scattering, 研究会「素粒子物理学に於ける場の理論」, Jan. 1981.
92.	Ken-Ichi Aoki, Zenro Hioki, Rokuo Kawabe, Michiji Konuma and Taizo Muta : One loop correction to nu e scattering in Weinberg-Salam model II, 日本物理学会秋季大会, Oct. 1980.
93.	Ken-Ichi Aoki, Zenro Hioki, Rokuo Kawabe, Michiji Konuma and Taizo Muta : One loop correction to nu e scattering in Weinberg-Salam model, 日本物理学会年次大会, Mar. 1980.
94.	Zenro Hioki : νN,μN 及び pN 反応における Charm 粒子対生成, 研究会「ハドロンの深部構造」, Nov. 1979.
95.	Zenro Hioki : νN,μN および pN 反応における Charm 粒子対生成, 日本物理学会秋季大会, Oct. 1979.
96.	Zenro Hioki : l N 反応における Multimuon 生成の現象論的分析, 日本物理学会秋季大会, Sep. 1978.
97.	Zenro Hioki : Lepton-induced Multimuon Production, 研究会「基本構成子と弱い相互作用」, Aug. 1978.
98.	Zenro Hioki : Lepton-Nucleon 散乱における Multimuon 生成とNew Heavy Leptons, 日本物理学会年次大会, Apr. 1978.
99.	Zenro Hioki and Takao Kawaguchi : Fixed Point を持つ Field Theory における Scaling Violation について, 研究会「スケーリングの破れとハドロンの構成子の構造」, Dec. 1977.
100.	Zenro Hioki : (V-A) 模型における Ordinary Lepton と Heavy Lepton の Mixing の可能性について, 研究会「新粒子·異常現象と新しい多元模型の可能性」, May 1977.
101.	Zenro Hioki : Weak Phenomenologies and Delta C not equal to 0 Neutral Current, 日本物理学会春季大会, Apr. 1977.
102.	Zenro Hioki : Weak Phenomenologies and Delta C not equal to 0 Neutral Current, 研究会「弱い相互作用の研究」, Dec. 1976.

Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)

Optimal-observable analyses of possible new interactions via next-generation accelerators (Project/Area Number: 22540284 )
Studies for gauge-Higgs unification theories and quark-lepton generation structure (Project/Area Number: 16540258 )
Flavor Physics based on Non-perturbative Dynamics of Supersymmetric Gauge Theories (Project/Area Number: 13135219 )
New Physics Search via Radiative Corrections (Project/Area Number: 06640401 )
Violation of symmetry in B hadron decay (Project/Area Number: 05640352 )
Phenomenological Study of Gauge Theory (Project/Area Number: 03302015 )
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Professor Emeritus : Hioki, Zenro

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Grants-in-Aid for Scientific Research (KAKEN Grants Database @ NII.ac.jp)