Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
Koji Tsumura Last modified date:2021.05.20

Associate Professor / Department of Physics / Faculty of Sciences


Presentations
1. Koji Tsumura, The Origin of Pseudo-Nambu-Goldstone Dark Matter, RIS-TCS 2020 -Frontier of Physics and Chemistry-, 2020.03.
2. Koji Tsumura, Geometry of Extended Higgs sector, UCLA PACIFIC 2019, 2019.09.
3. Koji Tsumura, Scalar doublets charged under μ-τ-philic Zn flavor symmetry, The 8th Workshop on Flavor Symmetries and Consequences in Accelerators and Cosmology (FLASY 2019), 2019.07.
4. Koji Tsumura, Syndetic Extension of Baryon and Lepton Numbers, Exploration of Particle Physics and Cosmology with Neutrinos Workshop 2019, 2019.07.
5. Koji Tsumura, Effect of Initial Spacial Phase in Neutrino Mass Spectroscopy, The 5th Computational Chemistry Symposium -The main symposium of ICCMSE 2019-, 2019.05.
6. Koji Tsumura, Recent Theoretical Development on RENP, Okayama Mini-Workshop, 2019.03.
7. Koji Tsumura, Recent Theoretical Development on RENP, The 11th International Workshop on Fundamental Physics Using Atoms (FPUA2019), 2019.03.
8. Koji Tsumura, Poster Summary, Higgs as a Probe of New Physics 2019, 2019.02.
9. Koji Tsumura, Towards Neutrino Mass Spectroscopy, 基礎物理学研究所セミナー, 2018.11.
10. Koji Tsumura, Symmetry and Geometry in Generalized Higgs sector, The OIST-NTU-Kyoto High Energy Physics Workshop, 2018.11.
11. Koji Tsumura, Recent Development on RENP, Quantum Sensing for Dark Matter Searches and Neutrino Physics, 2018.10.
12. Koji Tsumura, An SU(2)μτ model for Muon g-2 Anomaly, Workshop on Multi-Higgs models, 2018.09.
13. Koji Tsumura, Scotogenic Seesaw Mechanism and Gauged Discrete Symmetries, Unification and Development of the Neutrino Science Frontier, 2018.03.
14. Koji Tsumura, Neutrino Meets SIMP Dark Matter, Workshop for Unification and Development of the Neutrino Science Frontier, 2017.12.
15. Koji Tsumura, Towards Neutrino Mass Spectroscopy (High-Energy Physics at Low Energy Frontier), East Asia Joint Workshop on Fields and Strings 2017, KEK Theory workshop 2017, 2017.11.
16. Koji Tsumura, Maxion : Majoron as the QCD Axion in a Radiative Seesaw Model, The 7th KIAS Workshop on Particle Physics and Cosmology and The 2nd KEK-NCTS-KIAS Workshop on Particle Physics Phenomenology, 2017.11.
17. Koji Tsumura, Neutrinos Meet SIMP, Energy Frontier in Particle Physics: LHC and Future Colliders, 2017.09.
18. Koji Tsumura, Towards Neutrino Mass Spectroscopy, 東大本郷 素粒子論セミナー, 2017.07.
19. Koji Tsumura, Towards Neutrino Mass Spectroscopy, 國家理論科學研究中心物理組(北部, 國立臺灣大學) HEPジャーナルクラブ, 2017.06.
20. Koji Tsumura, Lepton Flavor Violation in the Lepton Sector, Lepton Flavor Violation in the Lepton Sector, 2017.06.
21. Koji Tsumura, Towards Neutrino Mass Spectroscopy, The 3rd Computational Chemistry Symposium -The main symposium of ICCMSE 2017-, 2017.04.
22. Koji Tsumura, Scotogenic Seesaw Mechanism & Discrete Gauge Symmetries, 國家理論科學研究中心物理組(北部, 國立臺灣大學) HEPジャーナルクラブ, 2016.11.
23. Koji Tsumura, Scotogenic Seesaw Mechanism & Discrete Gauge Symmetries, IBS-CTPU セミナー, 2016.11.
24. Koji Tsumura, Towards Neutrino Mass Spectroscopy, The NTU-Kyoto Workshop, 2016.11.
25. Koji Tsumura, Can the Models of LHC Diphoton Excesses be Valid up to the Planck scale?, East Asia Joint Workshop on Fields and Strings, 2016.05.
26. Koji Tsumura, Can the New Physics Models be Valid up to the Planck scale?, The NTU-Kyoto Workshop, 2016.03.
27. Koji Tsumura, Scalar Interpretations of the Diboson Excesses, Diboson Theory Workshop (Diboson/Multilepton Subgroup Meeting), 2015.11.
28. Koji Tsumura, Landau Pole from Scalar N-plets, KIAS-CFHEP Workshop and the 5th KIAS Workshop on Particle Physics and Cosmology, 2015.11.
29. Koji Tsumura, Prospects of LHC Run II, Developments in String Theory and Quantum Field Theory, 2015.11.
30. Koji Tsumura, Unitarity and Electroweak Oblique Corrections, CosKASI Dark Matter Workshop 2015, 2015.06.
31. Koji Tsumura, Unitarity and Electroweak Oblique Corrections, The 2nd Joint Kyoto-NTU High Energy Theory Workshop, 2015.03.
32. Koji Tsumura, Poster Summary II, Higgs as a Probe of New Physics 2015, 2015.02.
33. Koji Tsumura, A Model with the Higgs Septet, 國立中央大學 セミナー, 2014.12.
34. Koji Tsumura, Zero Higgs Doublet Model, 中原大學 セミナー, 2014.12.
35. Koji Tsumura, A Model with the Higgs Septet, 國立成功大學 セミナー, 2014.12.
36. Koji Tsumura, Fingerprinting Non-Minimal Higgs Sector, Second KIAS-NCTS Joint Workshop, 2014.12.
37. Koji Tsumura, Zero Higgs Doublet Mode, International Workshop on "Theoretical Particle Physics 2014", 2014.11.
38. Koji Tsumura, What if K_W \neq K_Z ? -- Zero Higgs Doublet Model --, The 2014 International Workshop on Future Linear Colliders (LCWS14), 2014.10.
39. Koji Tsumura, Radiative Seesaw Models with Leptoquarks, Run 2 kick-off meeting for leptoquarks, lepton+jets black hole searches in ATLAS, 2014.10.
40. Koji Tsumura, From the Higgs Coupling to New Physics Beyond the SM, Progress in String Theory and Particle Phenomenology -the Kick-off Workshop of SPIRITS-, 2014.09.
41. Koji Tsumura, Physics at ILC : A Theory Perspective, ILD Meeting 2014, 2014.09.
42. Koji Tsumura, Zero Higgs Doublet Model, Summer Institute 2014, 2014.08.
43. Koji Tsumura, A Model with the Higgs Septet, 東北大学 素粒子論セミナー, 2014.07.
44. Koji Tsumura, Tau Lepton in Higgs Physics, 北海道大学 素粒子セミナー, 2014.07.
45. Koji Tsumura, A Model with the Higgs Septet, 北海道大学 素粒子セミナー, 2014.07.
46. Koji Tsumura, ILC Physics Overview, ILC Tokusui Workshop 2013, 2013.12.
47. Koji Tsumura, What if the Higgs coupling deviates from the SM one, International Workshop on Future Linear Colliders 2013 (LCWS2013), 2013.11.
48. Koji Tsumura, A model with the Higgs septet, International Workshop on "Theoretical Particle Physics 2013", 2013.11.
49. Koji Tsumura, Discrimination of models including H ±± by using tau decay, 23rd Hadron Collider Physics Symposium 2012, HCP 2012, 2013.09, The doubly charged scalar boson (H±±) is introduced in several models of the new physics beyond the standard model. The H±± can have Yukawa interactions with two left-handed charged leptons or two righthanded charged leptons. We study kinematical properties of H±± decay products through tau leptons in order to discriminate the chiral structures of the new Yukawa interaction. The chirality of tau leptons can be measured by the energy distributions of the tau decay products, and thus the chiral structure of the new Yukawa interaction can be traced in the invariant-mass distributions of the H ±± decay products [1]..
50. Koji Tsumura, The Higgs boson mixes with an SU(2) septet, KEK Theory Meeting 2013 on Particle Physics Phenomenology (fall), 2013.09.
51. Koji Tsumura, The Higgs boson mixes with an SU(2) septet, The 21st International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY2013), 2013.08.
52. Koji Tsumura, Lepton number violation at the LHC with leptoquarks and diquarks, The 3rd Workshop on Flavor Symmetries (FLASY13), 2013.07.
53. Koji Tsumura, The Higgs boson mixes with an SU(2) septet, European Linear Collider Workshop (ECFA LC2013), 2013.05.
54. Koji Tsumura, The Higgs boson mixes with an SU(2) septet, QFPU Final International Forum, 2013.03.
55. Koji Tsumura, Discrimination of models including doubly charged scalar bosons using tau decays, KEK Theory Meeting 2013 on Particle Physics Phenomenology, 2013.03.
56. Koji Tsumura, Two Higgs Doublet Models, Higgs as a Probe of New Physics 2013, 2013.02.
57. Koji Tsumura, QCD Corrections to Electric Dipole Moment from Dimension-six Four-Quark Operators, Strong Coupling Gauge Theory 2012, 2012.12.
58. Koji Tsumura, Discrimination of models including doubly charged scalar bosons using tau decays, Hadron Collider Physics Symposium 2012, 2012.11.
59. Koji Tsumura, Extra Higgs bosons and tanβ, International Workshop on Future Linear Colliders 2012 (LCWS2012), 2012.10.
60. Koji Tsumura, Discrimination of models with doubly charged scalar bosons at the LHC, International Workshop on "Theoretical Particle Physics 2012", 2012.09.
61. Koji Tsumura, Discrimination of models including doubly charged scalar bosons using tau decays, The 12th International Workshop on Tau Lepton Physics, 2012.09.
62. Koji Tsumura, RG improvement of the Higgs mediated EDM, Workshop on Multi-Higgs models, 2012.08.
63. Koji Tsumura, Discrimination of models with doubly charged scalar bosons, Summer Institute 2012, 2012.08.
64. Koji Tsumura, RG improvement of the CEDM via CP violating 4-Fermi operators, 高エネルギー加速器研究機構 理論セミナー, 2012.07.
65. Koji Tsumura, Leptophilic two Higgs doublet model at the LHC, 基礎物理学研究所セミナー, 2012.06.
66. Koji Tsumura, Multi-tau-lepton signatures at the LHC in the two Higgs doublet model, 名古屋大学 EHQGセミナー, 2012.04.
67. Koji Tsumura, Multi tau lepton signatures in leptophilic two Higgs doublet model at the ILC, Joint ACFA Physics / Detector Workshop and GDE meeting on Linear Collider (KILC12), 2012.04.
68. Koji Tsumura, Multi-tau-lepton signatures at the LHC in the two Higgs doublet model, 國家理論科學研究中心物理組 HEPジャーナルクラブ, 2012.03.
69. Koji Tsumura, Multi-tau-lepton signatures at the LHC in the two Higgs doublet model, LHC Focus Group Workshop on Collider and Dark Matter Physics, 2012.03.
70. Koji Tsumura, Multi-tau-lepton signatures at the LHC in the two Higgs doublet model, 國家理論科學研究中心物理組(北部, 國立臺灣大學) HEPジャーナルクラブ, 2012.02.
71. Koji Tsumura, Multi-tau-lepton signatures at the LHC in the two Higgs doublet model, KEK Theory Meeting 2012 on Particle Physics Phenomenology, 2012.02.
72. Koji Tsumura, Multi-tau-lepton signatures at the LHC in the two Higgs doublet model, Toyama mini workshop on particle physics and cosmology, 2012.02.
73. Koji Tsumura, Multi-tau-lepton signatures at the LHC in the two Higgs doublet model, Physics opportunities with LHC at 7 TeV, 2012.02.
74. Koji Tsumura, Heavy electrically charge neutral fermions (Is it Majorana or Dirac particle?), Focus workshop on Heavy Quarks at LHC, 2012.01.
75. Koji Tsumura, Heavy Long-lived quarks, Focus workshop on Heavy Quarks at LHC, 2012.01.
76. Koji Tsumura, Indirect bounds on heavy scalar masses of the two-Higgs-doublet model, 2012 Annual Meeting of the Physical Society of ROC, 2012.01.
77. Shinya Kanemura, Koji Tsumura, Hiroshi Yokoya, Multi-tau lepton signatures in leptophilic two higgs doublet model at the ILC, International Workshop on Future Linear Colliders, LCWS 2011, 2011.12, We study the feasibility of the Type-X two Higgs doublet model (THDM-X) at collider experiments. In the THDM-X, new Higgs bosons mostly decay into tau leptons in the wide range of the parameter space. Such scalar bosons are less constrained by current experimental data, because of the suppressed quark Yukawa interactions. We discuss a search strategy of the THDM-X with multi-tau lepton final states at International linear collider and Large Hadron Collider. By using the collinear approximation, we show that a four tau lepton signature (e+e- → HA → 4τ ) can be a clean signal..
78. Koji Tsumura, Indirect bounds on heavy scalar masses of the two-Higgs-doublet model in light of recent Higgs boson searches, 國立清華大學 理論セミナー, 2011.10.
79. Koji Tsumura, Lepton flavor violation with fourth generations, Third Workshop on Beyond 3 Generation Standard Model --- Under the light of the initial LHC results, 2011.10.
80. Koji Tsumura, Multi tau lepton signatures in leptophilic two Higgs doublet model at the ILC, International Workshop on Future Linear Colliders 2011 (LCWS2011), 2011.09.
81. Koji Tsumura, Leptophilic Higgs boson in the two-Higgs-doublet model, 國立交通大學 理論セミナー, 2011.05.
82. Koji Tsumura, Leptophilic Higgs boson in the two-Higgs-doublet model, 國立師範大學 理論セミナー, 2011.04.
83. Koji Tsumura, Phenomenology in the Higgs Triplet Model with the A_4 Symmetry, 國家理論科學研究中心物理組 HEPジャーナルクラブ, 2011.03.
84. Koji Tsumura, Phenomenology in the Higgs Triplet Model with the A_4 Symmetry, 大阪大学 素粒子論セミナー, 2011.02.
85. Koji Tsumura, Phenomenology in the Zee Model with the A_4 Symmetry, 2011 Annual Meeting of the Physical Society of ROC in Taipei, 2011.01.
86. Koji Tsumura, Phenomenology in the Higgs Triplet Model with the A_4 Symmetry, 中央研究院物理研究所セミナー, 2010.12.
87. Koji Tsumura, Phenomenology in the Higgs Triplet Model with the A_4 Symmetry, 國家理論科學研究中心物理組(北部, 國立臺灣大學) HEPジャーナルクラブ, 2010.11.
88. Koji Tsumura, Higgs boson pair production in new physics models at hadron, lepton, and photon colliders, LC10, New physics: complemetarities between direct and indirect searches, 2010.11.
89. Koji Tsumura, Higgs Triplet Model with A4 symmetry, 国際理論物理学センター HEPセミナー, 2010.09.
90. Daisuke Harada, Eri Asakawa, Shinya Kanemura, Yasuhiro Okada, Koji Tsumura, Higgs boson pair production at the Photon Linear Collider in the two Higgs doublet model, 8th General Meeting of the ILC Physics Working Group, 2009.12, We calculate the cross section of the lightest Higgs boson pair production at the Photon Linear Collider in the two Higgs doublet model. We focus on the scenario in which the lightest Higgs boson has the standard model like couplings to gauge bosons. We take into account the one-loop correction to the hhh coupling as well as additional one-loop diagrams due to charged bosons to the γγ → hh helicity amplitudes. We discuss the impact of these corrections on the hhh coupling measurement at the Photon Linear Collider..
91. Shinya Kanemura, Koji Tsumura, Measuring Higgs boson associated Lepton Flavour Violation in electron-photon collisions at the ILC, 8th General Meeting of the ILC Physics Working Group, 2009.12, We study the LFV Higgs production processes e-γ → l- φ (l = μ, τ; φ = H, A) as a probe of Higgs mediated LFV couplings at an electron-photon collider, where H and A are extra CP even and odd Higgs bosons, respectively, in the two Higgs doublet model. Under the constraints from the current data of muon and tau rare decay, the cross section can be significantly large. It would improve the experimental upper bounds on the effective LFV coupling constants. In addition, the chirality nature of the LFV Higgs coupling constants can be measured by selecting electron beam polarizations..
92. Koji Tsumura, Models of Yukawa interaction in the two Higgs doublet model, DESY THEORY WORKSHOP 2009 Collider Phenomenology, 2009.09.
93. Koji Tsumura, Lepton Flavour Violation at an Electron-Photon Collider, LC09, e+e- Physics at the TeV Scale and the Dark Matter connection, 2009.09.
94. Koji Tsumura, Leptophilic Higgs bosons in the two-Higgs-doublet model, 国際理論物理学センター HEPセミナー, 2009.03.
95. Eri Asakawa, Daisuke Harada, Shinya Kanemura, Yasuhiro Okada, Koji Tsumura, Higgs boson pair production at the photon linear collider in the two Higgs doublet model, 2008 Linear Collider Workshop, LCWS 2008 and International Linear Collider Meeting, ILC 2008, 2008.12, We calculate the cross section of the lightest Higgs boson pair production at the Photon Linear Collider in the two Higgs doublet model. We focus on the scenario in which the lightest Higgs boson has the standard model like couplings to gauge bosons. We take into account the one-loop correction to the hhh coupling as well as additional one-loop diagrams due to charged bosons to the γγ → hh helicity amplitudes. We discuss the impact of these corrections on the hhh coupling measurement at the Photon Linear Collider..
96. Koji Tsumura, Impact of higher dimensional operators on Higgs boson phenomenology, International Linear Collider ECFA Workshop 2008, 2008.06.
97. Koji Tsumura, Impact of dim-6 Higgs-fermion and Higgs genuine operators on processes at the future colliders, Joint ACFA Physics and Detector Workshop and GDE meeting on International Linear Collider (TILC08), 2008.03.
98. Koji Tsumura, Lepton flavour violation in the Higgs boson decay, 国際理論物理学センター HEPセミナー, 2007.12.
99. Shinya Kanemura, Koichi Matsuda, Daisuke Nomura, Koji Tsumura, New physics effect on the top-Yukawa coupling at ILC, 2007 International Linear Collider Workshop, LCWS 2007 and International Linear Collider Meeting, ILC 2007, 2007.12, Measurement of the top-Yukawa coupling is important to understand the fermion mass generation mechanism and dynamics of electroweak symmetry breaking. We discuss the top quark anomalous couplings which can be described by higher dimensional operators. We investigate the process e-e+ → W-W+vv̄ → tt̄vv̄ to study the contribution of the anomalous top-Higgs coupling to the cross section. The effect of the dimension-six top-Higgs interaction on the cross section can be a few hundred percent greater than the SM prediction. Such a large effect can be measured at the International Linear Collider..
100. Koji Tsumura, New Physics effect on the Top-Yukawa coupling, Linear Collider Workshop 2007 (LCWS2007 and ILC2007), 2007.05.
101. Koji Tsumura, New Physics search via W-W+→ tt at the ILC, KEK Theory Meeting 2007 on Particle Physics Phenomenology, 2007.03.
102. Koji Tsumura, Dimension-six top-Higgs interaction and its effect in collider phenomenology, ILC-ECFA and GDE Joint Meeting, 2006.11.
103. Koji Tsumura, Dimension-six top-Higgs interaction and its effect in collider phenomenology, Joint Meeting of Pacific Region Particle Physics Communities (DPF2006+JPS2006…), 2006.10.
104. Koji Tsumura, Genuine dimension-six top-Higgs interaction and its effect on collider phenomenology, KEK Theory Meeting 2006 on Particle Physics Phenomenology, 2006.03.
105. Koji Tsumura, S. Kanemura, D. Nomura, Dimension-six top-higgs interaction and its effect in collider phenomenology, Annual Meeting of the Division of Particles and Fields of the American Physical Society, DPF 2006, and the Annual Fall Meeting of the Japan Particle Physics Community, 2006.01.
106. S. Kanemura, T. Ota, K. Tsumura, Measurement of lepton flavor violating yukawa couplings at ILC, 2005 International Linear Collider Workshop, LCWS 2005, 2005.12, We discuss lepton flavor violation (LFV) associated with tau leptons in the general framework of the two Higgs doublet model, in which LFV couplings are introduced as a deviation from Model II Yukawa interaction. Parameters of the model are constrained from experimental results and also from requirements of theoretical consistencies such as vacuum stability and perturbative unitarity. Current data for LFV rare tau decays provide substantial upper limits on the LFV Yukawa couplings in the large tanβ region, which are comparable with predictions in fundamental theories. Here tan β is the ratio of vacuum expectation values of the two Higgs doublets. A search for the LFV decays φ0→ τ±μ±e) of neutral Higgs bosons (φ0 = h, H and A) at future collider experiments can be useful to further constrain the LFV couplings, especially in the relatively small tanβ region (tan β ≲ 30), where rare tau decay data cannot give any strong limit..
107. Koji Tsumura, Lepton flavor violation in the Higgs boson decays, Hanoi-Forum 2005, 2005.09.
108. Koji Tsumura, Lepton flavor violation in Higgs boson decays, Summer Institute 2005, 2005.08.
109. Koji Tsumura, Lepton Flavor Violating Decays of Higgs bosons under the Rare Tau Decay Results, The 8th ACFA Workshop on Physics and Detector at the Linear Collider, 2005.07.
110. Koji Tsumura, Lepton flavor violation in Higgs boson decays under the rare tau decay results, Progress in Particle Physics 2005, 2005.06.
111. Koji Tsumura, Lepton flavor violation in the Higgs boson decay, KEK Theory Meeting 2005 on Particle Physics Phenomenology, 2005.03.
112. Koji Tsumura, Lepton Flavor Violation in the Higgs boson decay, Sapporo Winter School in Niseko '05, 2005.01.
113. Koji Tsumura, Yukawa Matrix and Lepton Flavor Violation, The 6th International Workshop on Neutrino Factories and Superbeams (NuFACT04), 2004.07.
114. Koji Tsumura, Phase contribution for LFV, The 21st International Conference on Neutrino Physics and Astrophysics (NEUTRINO2004), 2004.06.
115. Koji Tsumura, The Dependence of LFV on phases, KEK Theory Meeting 2004 on Particle Physics Phenomenology, 2004.03.
116. Koji Tsumura, Lepton Flavor Violating process and CP-phases, Sapporo Winter School in Niseko '04, 2004.01.