Takuya Morozumi

Last Updated :2021/04/16

Affiliations, Positions
Graduate School of Advanced Science and Engineering, Associate Professor
E-mail
morozumihiroshima-u.ac.jp
Self-introduction
My research field is elementary particle physics (theory).I I focus on the research related to the origins of the mass of elementary particles and the violation of symmetries.If you are interested in those subjects, let us discuss together.

Basic Information

Educational Backgrounds

  • Kyoto University, Graduate School, Division of Natural Science, Japan, 1986/04, 1989/03
  • Tohoku University, Faculty of Science, Japan, 1980/04, 1984/03

Academic Degrees

  • Ph.D., Kyoto University
  • Master of Science, Kyoto University

Educational Activity

  • 【Bachelor Degree Program】School of Science : Physics
  • 【Master's Program】Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Physics Program
  • 【Doctoral Program】Graduate School of Advanced Science and Engineering : Division of Advanced Science and Engineering : Physics Program

Research Fields

  • Mathematical and physical sciences;Physics;Particle / Nuclear / Cosmic ray / Astro physics

Research Keywords

  • Spin polarization
  • origin of mass
  • CP violation
  • "CKM
  • non-equilibrium field theory
  • tau lepton decay
  • Leptogenesis
  • leptogenesis

Educational Activity

Course in Charge

  1. 2021, Undergraduate Education, 4Term, Advanced Physics
  2. 2021, Undergraduate Education, First Semester, Relativistic Quantum Mechanics
  3. 2021, Undergraduate Education, First Semester, Special Study for Graduation A
  4. 2021, Undergraduate Education, Second Semester, Special Study for Graduation B
  5. 2021, Undergraduate Education, First Semester, Special Lectures in Physics(Mathematics for Physics E (Group Theory))
  6. 2021, Graduate Education (Master's Program) , First Semester, Seminar in Physical Science
  7. 2021, Graduate Education (Master's Program) , Second Semester, Seminar in Physical Science
  8. 2021, Graduate Education (Master's Program) , First Semester, Elementary Particle Physics Seminar
  9. 2021, Graduate Education (Master's Program) , Second Semester, Elementary Particle Physics Seminar
  10. 2021, Graduate Education (Doctoral Program) , First Semester, Special Research for Physical Science
  11. 2021, Graduate Education (Doctoral Program) , Second Semester, Special Research for Physical Science
  12. 2021, Graduate Education (Doctoral Program) , First Semester, Exercises on Advanced Research Presentation
  13. 2021, Graduate Education (Master's Program) , 1Term, Quantum Field Theory
  14. 2021, Graduate Education (Master's Program) , 1Term, Exercise in Physics I
  15. 2021, Graduate Education (Master's Program) , 2Term, Exercise in Physics I
  16. 2021, Graduate Education (Master's Program) , 3Term, Exercise in Physics II
  17. 2021, Graduate Education (Master's Program) , 4Term, Exercise in Physics II
  18. 2021, Graduate Education (Master's Program) , 1Term, Special Exsecise in Physics A
  19. 2021, Graduate Education (Master's Program) , 2Term, Special Exsecise in Physics A
  20. 2021, Graduate Education (Master's Program) , 3Term, Special Exsecise in Physics B
  21. 2021, Graduate Education (Master's Program) , 4Term, Special Exsecise in Physics B
  22. 2021, Graduate Education (Master's Program) , Academic Year, Special Research in Physics
  23. 2021, Graduate Education (Doctoral Program) , Academic Year, Special Research in Physics

Research Activities

Academic Papers

  1. Time variation of particle and antiparticle asymmetry in an expanding universe, PHYSICAL REVIEW D, 90(1), 20140715
  2. Charged Higgs and neutral Higgs pair production of the weak gauge boson fusion process in electron-positron collisions, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 201309
  3. Quark sector CP violation of the universal seesaw model, PHYSICAL REVIEW D, 88(3), 20130830
  4. The form factors of tau -> K pi(eta)nu and the predictions for CP violation beyond the standard model, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 201305
  5. Quantum correction to the tiny vacuum expectation value in the two-Higgs-doublet-model for the Dirac neutrino mass, PHYSICAL REVIEW D, 85(5), 20120301
  6. Effects of large threshold corrections in supersymmetric type-I seesaw model, JOURNAL OF HIGH ENERGY PHYSICS, 201011
  7. Threshold corrections to the radiative breaking of electroweak symmetry and neutralino dark matter in supersymmetric seesaw model, PHYSICAL REVIEW D, 81(1), 201001
  8. Low energy effective Lagrangian for supersymmetric seesaw model, INTERNATIONAL JOURNAL OF MODERN PHYSICS E-NUCLEAR PHYSICS, 16(5), 1437-1443, 200706
  9. Low scale seesaw model and lepton flavor violating rare B decays, PHYSICAL REVIEW D, 73(7), 200604
  10. Cosmological family asymmetry and CP violation, PHYSICAL REVIEW D, 72(1), 200507
  11. A new mechanism for baryogenesis living through electroweak era, PHYSICS LETTERS B, 616(1-2), 108-113, 20050609
  12. Leptogenesis and CP violation of neutrino oscillation, Neutrino Oscillation and their origin= World scientific= co., 447-454, 20040401
  13. ★, Primordial lepton family asymmetries in seesaw model, Prog. Theor. Phys., 111, 123-149, 20040101
  14. CP violation of early universe and the mass scale of heavy Majorana neutrinos, Quantum Aspects of Beam Physics= World Scientific. Co., 20040401
  15. Leptogenesis and low energy CP violation, a link, JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS, 29(8), 1877-1880, 200308
  16. Leptogenesis and low energy CP violation, a link, Journal of Physics G: Nucl. Part. Phys., 29(8), 1877-1880, 20030701
  17. Numerical Study On the correlation between CP violation in neutrino oscillation and baryogenesis, Nuclear Physics Proc., Suppl.111, 303-305, 20020401
  18. A relation between CP violation of low energy and leptogenesis, Nuclear Phys. Proc., Supl111, 303-305, 20020401
  19. Space Like Correlation of Feynman Propagator and Virtually Exchanged Neutrino Mass, 20130701
  20. ★, A BRIDGE BETWEEN CP VIOLATION AT LOW-ENERGIES AND LEPTOGENESIS, Nuclear Physics, B617, 475-492, 20011201
  21. Threshold corrections to the radiative breaking of electroweak symmetry and neutralino dark matter in supersymmetric seesaw model, Physical Review D, D81, 016011, 20100101
  22. Direct CP violation in hadronic tau decays, Nucl.Phys.Proc.Suppl., 189, 84-89, 20090401
  23. Mass Eigenstates and Eigenvalues of Seesaw, CP Violation and the Flavour Puzzle (ISBN 83-919954-1-0), P113-118, 20060401
  24. Cosmological Family Asymmetry and CP violation, Physical Review D, 72, 016006, 20050727
  25. ★, CP violation of neutrino oscillation and leptogenesis, Physical Review Letters, 89, 231601-1-231601-4, 20020401
  26. A relation between CP violation of low energy and leptogenesis, NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS, 111, 303-305, 200211
  27. CP violation in neutrino oscillation and leptogenesis, PHYSICAL REVIEW LETTERS, 89(23), 20021202
  28. Numerical study on the correlation between CP violation in neutrino oscillations and baryogenesis, NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS, 111, 291-293, 200211
  29. CP violation in the seesaw model, PHYSICAL REVIEW D, 64(1), 20010701
  30. Azimuthal angle distribution in B -> K*(-> K pi)l(+) l(-) in the low invariant m(l)+(l)- region, PHYSICAL REVIEW D, 62(3), 20000801
  31. Penguin diagrams in the Delta I=1/2 rule and epsilon '/epsilon with sigma models, PHYSICAL REVIEW D, 62(1), 20000701
  32. Neutrino mixing in the seesaw model, PROGRESS OF THEORETICAL PHYSICS, 103(2), 379-391, 200002
  33. AZIMUTHAL ANGLE DISTRIBUTION IN $B \rightarrow K^{*} (\rightarrow K \pi)$, Physical Review, D62(1), 034013-1-034013-9, 20000801
  34. PENGUIN DIAGRAMS IN THE DELTA I = 1/2 RULE AND EPSILON-PRIME EPSILON WITH SIGMA MODELS, Physical Review, D62(1), 014002-1-014002-10, 20000701
  35. A MODEL INDEPENDENT ANALYSIS OF THE RARE B DECAY $ B \rightarrow X_s l^+ l^-$, Physical Review, D59(1), 074013-1-074013-15, 19990401
  36. NEUTRINO MIXING IN SEESAW MODEL, Progress of Theoretical Physics, 101(3), 379-391, 19990301
  37. QUARK MASS HIERARCHY, FCNC AND CP VIOLATION IN A Seesaw Model, Progress of Theoretical Physics, 101(3), 671-706, 19990301
  38. NEW PHYSICS EFFECTS IN $ B \rightarrow K^* \nu \nu$ DECAYS, Physical Review, D60(1), 094007-1-094007-8, 19990401
  39. ★, Power corrections in the decay rate and distribution in $B \rightarrow X_s l^+ l^-$ in the standard model, Physical Review, D57(7), 4105-4128, 19970401
  40. $B \rightarrow X_q l^+ l^- (q=d,s)$ and determination of $|V_{td}/V_{ts}|, Physical Review, D56(11), 7240-7246, 19971201
  41. The top quark mass and flavour mixing in a Seesaw model of quark masses, Physics Letters, B410(2), 233-240, 19971001
  42. b to s(d) gamma with a Vector-Like Quark As Fourth Generation, Modern Physics Letters, A(10), 309-322, 19950201
  43. EFFECT OF FLAVOR CHANGING NEUTRAL CURRENTS IN THE LEPTONIC ASYMMETRY IN B(D) DECAYS, Physics Letters, B306, 398-402, 19930401
  44. CP asymmetries in B0 decays in the presence of flavor changing neutral currents, Physical Review, D48(3), 1167-1175, 19930801
  45. POSSIBLE APPLICATIONS OF THE LINEAR SIGMA MODEL TO LATTICE COMPUTATIONS WITH LARGE MPi)., Physical Review, D46(5), 2240-2246, 19920901
  46. From QCD to Chiral Dynamics a Smooth Transition, Progress of Theoretical Physics, 87(1), 185-191, 19920101
  47. ★, FORWARD-BACKWARD ASYMMETRY OF DILEPTON ANGULAR IN THE DECAY $ b \rightarrow s l^+ l^-$, Physics Letters, B273(4), 505-512, 19911201
  48. ★, Chiral Weak Dynamics, Physical Review Letters, 65(4), 404-407, 19900301
  49. Discriminating technicolor theories through flavorchanging neutral currents; walking or standing coupling constants, Physical Review Letters, 59(4), 389-392, 19870501
  50. CP Conserving Contribution in the Decays $K_L \rightarrow \pi^0 \gamma \gamma $ and $K_L \rightarrow \pi^0 e^+ e^-$, Progress of Theoretical Physics, 82(1), 371-379, 19890201
  51. A PREDICTION FOR $ d\Gamma (b \rightarrow s l^+ l^-) /d Q^2 $INCLUDING THE LONG DISTANCE EFFECTS, Physics Letters, B218(3), 343-354, 19890201
  52. Chiral Symmetry Nreaking of Strong Coupling QED, Progress of Theoretical Physics, 77(6), 1434-1449, 19870301
  53. COVARIANT QUANTIZATION OF NEVEU-SCHWARZ-RAMOND, Progress of Theoretical Physics, 75(4), 934-952, 19860401
  54. An analysis of Non-compact non-linear sigma model, Progress of Theoretical Physics, 75(3), 677-685, 19860301
  55. Precise discussion of time-reversal asymmetries in B-meson decays, JOURNAL OF HIGH ENERGY PHYSICS, 20150226
  56. CREATION AND EVOLUTION OF PARTICLE NUMBER ASYMMETRY IN AN EXPANDING UNIVERSE, RUSSIAN PHYSICS JOURNAL, 59(11), 1852-1856, 201703
  57. CONSTRAINT ON SEESAW MODEL PARAMETERS WITH ELECTROWEAK VACUUM STABILITY, RUSSIAN PHYSICS JOURNAL, 59(11), 1857-1863, 201703
  58. Phenomenological aspects of possible vacua of a neutrino flavor model, CHINESE PHYSICS C, 42(2), 201802
  59. Effective theory analysis for vector-like quark model, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 201804
  60. Analysis of Dalitz decays with intrinsic parity-violating interactions in resonance chiral perturbation theory, PROGRESS OF THEORETICAL AND EXPERIMENTAL PHYSICS, 201812
  61. A New Mechanism for Generating Particle Number Asymmetry through Interactions, ADVANCES IN HIGH ENERGY PHYSICS, 2019
  62. Hidden relations in three generation seesaw model with Dirac mass matrix of four-zero texture, PHYSICS LETTERS B, 799, 20191210

Publications such as books

  1. 2000/01, Rare Semi/Leptonic B decays , Proceedings of the third international conference on B physics and CP violation, 2000, 01, Report, Takuya Morozumi, ISBN: 978-981-02-4376-0

Invited Lecture, Oral Presentation, Poster Presentation

  1. Study of an anomalous tau decay using a chiral Lagrangian with vector mesons, Takuya Morozumi, Hiroyuki Umeeda, Daiji Kimura, The 13 th International workshop on tau lepton physics, 2014/09/16, Without Invitation, English, Aachen/ Germany
  2. A new mechanism for generating particle number asymmetry through interactions, Morozumi Takuya, Apriadi Salim Adam, Keiko Nagao, Hiroyuki Takata, Maskawa Jyuku Seminar (Kyoto Sangyo Univ.), 2017/11/27, With Invitation, Japanese, Maskawa Jyuku, Kyoto Sangyo Univ., A new mechanism for generating particle number asymmetry (PNA) has been developed.This mechanism is realized with a Lagrangian including a complex scalar field and a neutral scalar field. The complex scalar carries U(1) charge which is associated with the PNA. In the spatially flat universe with a time-dependent scale factor, the time evolution of the PNA is computed. We start with an initial condition where only the condensation of the neutral scalar is non-zero. With the above initial conditions, the PNA vanishes at the initial time and later it is generated through the interaction between the complex scalar and the condensation of the neutral scalar. We investigate the time dependence of the PNA and find that PNA oscillates at the early time and it begins to dump at the later time. The period and the amplitude of the oscillation depend on the mass spectrum of the model, the temperature and the expansion rate of the universe. We discuss the implications of the oscillating behavior of the PNA on scenarios for the generation of the baryon asymmetry of the universe (BAU).
  3. Leptogenesis and CP violation of Neutrino sectors, Takuya Morozumi, 3rd International Conference on Flavor Physics (ICFP), 2005/05/10, With Invitation, English, National Central University, Chung-li, Taiwan, Paoti Chang (National Taiwan Univ.) Yuan-Hann Chang (Nation Central Univ.) Cheng-Wei Chiang (National Central Univ.) Wei-Shu Hou (National Taiwan Univ.) Otto C.W. Kong (National Central Univ.) -- chair Hsiang-nan Li (Academia Sinica) Henry Tsz-king Wong (Academia Sinica), published
  4. Time dependence of particle number asymmetry induced with CP violating interaction., T. Morozumi, Apriadi Salim Adam, Keiko Nagao, Hiroyuki Takata, Quantum Field Theory and Gravity (QFTG2016), 2016/03/08, With Invitation, English
  5. LEPTOGENESIS AND CP VIOLATION OF NEUTRINO OSCILLATION, Takuya Morozumi, T. Endoh, SynKyu Kang, M. Tanimoto, S. Kaneko, The fourth International workshop on Neutrino Oscillation and its origin (NOON2003), 2003/02/14, Without Invitation, English, Y. Itow (ICRR, Univ. of Tokyo) Y. Obayashi (ICRR, Univ. of Tokyo) M. Nakahata (ICRR, Univ. of Tokyo)(scientific secretary) M. Shiozawa (ICRR, Univ. of Tokyo) Y. Suzuki (ICRR, Univ. of Tokyo)(chairman), Kanazawa, published
  6. Relation between CP violation at low energy and leptogenesis, Takuya Morozumi, T. Endoh, A. Purwanto, 2002/01/17, With Invitation, Japanese, Y. Nagashima, Y.Kuno, T.Yamanaka, IIAS, Kyoto, published, VIDEO, Slide
  7. The Creation of the Particle Number Asymmetry in the Universe, Takuya Morozumi, Apriadi Salim Adam,K.Nagao, H. Takata, 4th International Workshop on Dark Matter, Dark Energy and Matter-Antimatter Asymmetry, 2016/12/30, With Invitation, English, Jiunn-Wei Chen (NTU) Chao-Qiang Geng (NCTS/NTHU) (Chair) Xiao-Gang He (NCTS/NTU) Wolung Lee (NTNU) Cheng-Pang Liu (NDHU) (Co-Chair) Kin-Wang Ng (AS) Henry T. Wong (AS), National Center for Theoretical Sciences (NCTS), published
  8. Time variation of particle and anti-particle number in curved spacetime, Takuya Morozumi, R. Hotta, H. Takata, 3rd International Workshop on Dark Matter, Dark Energy and Matter-Antimatter Asymmetry, 2012/12/28, With Invitation, English, Organization Committee Kazuharu Bamba (KMI, Japan) Chuan-Hung Chen (NCKU) Pisin Chen (NTU) Chao-Qiang Geng (NCTS/NTHU) (Chair) Yun-Gui Gong (HUST, China) Je-An Gu (NTU) (Co-Chair) Xiao-Gang He (NCTS/NTU) Guey-Lin Lin (NCTU) Wolung Lee (NTNU) Guo-Chin Liu (TKU) Kin-Wang Ng (AS), NTHU, Hsinchu , Taiwan
  9. Particle Number Asymmetry of the early universe, Takuya Morozumi, K. I. Nagao, Apriadi Salim Adam, Hiroyuki Takata, 5th International workshop on Dark Matter, Dark Energy and Matter-Anti-Matter Asymmetry, 2018/12/28, With Invitation, English, National Center for Theoretical Sciences (NCTS), Hsinchu, Taiwan National Tsing Hua University, 28 Hsinchu, Taiwan 29-31 Fo-Guang-Shan, Kaohsiung, Taiwan
  10. Lepton Number Violation in a unified framework, Takuya Morozumi, Yuta Kawamura, ,Yamato Matsuo , Apriadi Salim Adam,Yusuke Shimizu, Yamato Matsuo ,Yuya Tokunaga, Naoya Toyota,, PACIFIC 2019 Particle Astrophysics and Cosmology Including Fundamental InteraCtions, 2019/09/03, With Invitation, English, Moorea, French Polynesia

External Funds

Acceptance Results of Competitive Funds

  1. KAKENHI, Study on lepto-genesis andlepton number violation with non-equilibrium quantum field theory, 2010, 2012
  2. KAKENHI, 2008, 2009
  3. KAKENHI, 2007, 2007
  4. KAKENHI, 2004, 2005
  5. KAKENHI, Higgs decays and origin of CP violation, 2001, 2002
  6. KAKENHI, 2000, 2000
  7. KAKENHI, Higgs search by means of τ vertex tagging, 2000, 2002
  8. KAKENHI, Supersymmetric Composite Models in the Early Stage of the Universe, 1999, 2001
  9. KAKENHI, 1999, 1999
  10. KAKENHI, 1998, 1998
  11. KAKENHI, 1997, 1997
  12. KAKENHI, Origin of CP and T Violation and Flabor Physiscs, 1996, 1997
  13. KAKENHI, Dynamical Symmetry Breaking in Curved Space-time, 1996, 1998
  14. KAKENHI, The origin of elementary particle interaction, 1994, 1996
  15. KAKENHI, 1994, 1994
  16. KAKENHI, Dynamical Origin of Higgs Mechanism in Electroweak Theory, 1992, 1994
  17. KAKENHI, 2016, 2018
  18. KAKENHI(Grant-in-Aid for Scientific Research (C)), Lepton Number of Cosmic Background Neutrinos and Generation Mechanism of Particle Number in the Universe, 2017, 2021
  19. Kakenhi, 2016, 2020

Social Activities

Organizing Academic Conferences, etc.

  1. 1 st Core-U International Conference;Intense Fields and Extreme Universe, Local Organize Commitee, Secretary of Conference, 2016/, 2016/