Search for Physics Beyond the Standard Model from the Higgs Precision Measurements

• Project/Area Number: 15K05047
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Nagoya University
• Principal Investigator: Tanabashi Masaharu 名古屋大学, 理学研究科, 教授 (00270398)
• Project Period (FY): 2015-04-01 – 2019-03-31
• Project Status: Completed (Fiscal Year 2018)
• Budget Amount: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000); Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000); Fiscal Year 2016: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000); Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
• Keywords: 電弱対称性の破れ / 低エネルギー有効理論 / 素粒子現象 / ヒッグス / 非線形シグマ模型 / 拡張されたヒッグス模型 / 電弱対称性の自発的破れ / 摂動論的ユニタリティー / 素粒子質量起源 / ユニタリティー / 電弱精密測定 / 宇宙暗黒物質 / フレーバー精密測定 / コライダー物理

Outline of Final Research Achievements

We investigate W′ interpretations for the ATLAS 2 TeV diboson anomalies. We find the unitarity sum rules and the custodial symmetry are powerful enough to predict various nontrivial relations among WWZ′, WZW′, WWh, WW′h and ZZ′h coupling strengths in a model independent manner.
A generalization of Higgs effective field theory (HEFT) including arbitrary number of extra neutral and charged Higgs bosons (generalized HEFT, GHEFT) is formulated to describe non-minimal electroweak symmetry breaking models. It is shown that the scalar boson scattering amplitudes are described in terms of the Riemann curvature tensor (geometry) of the scalar manifold and the covariant derivatives of the potential.
We also prposed a novel possibility of the DM model buildings in which the mediator particle m is unified with the DM particle d in an approximate dark symmetry multiplet. A pionic DM model is proposed to illustrate this idea in a renormalizable field theory framework.

Academic Significance and Societal Importance of the Research Achievements

2012年にLHC実験で発見されたヒッグス粒子は、素粒子標準理論の予言する唯一のスカラー素粒子であり、あらゆる素粒子の質量の起源を担うと考えられている。しかしながら、素粒子標準理論にはヒッグス粒子以外のスカラー素粒子は存在せず、ヒッグス粒子の正体は、いまだ謎に包まれている。本研究は、ユニタリティーやくりこみ可能性といった純理論的な制約が、ヒッグス粒子あるいはその拡張模型の性質にどのような制限を与えるかを明らかにするものである。今後、ヒッグス粒子結合の精密測定が進むことで、素粒子標準模型の破綻が明らかになることが期待される。

Research Products

• [Journal Article] Review of Particle Physics (2018)
  • Author(s): Tanabashi M.、Hagiwara K.、Hikasa K.、Nakamura K.、Murayama H.、et al.
  • Journal Title: Physical Review D Volume: 98 Issue: 3 Pages: 030001-030001
  • DOI: 10.1103/physrevd.98.030001
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Relic Abundance in a Secluded Dark Matter Scenario with a Massive Mediator (2017)
  • Author(s): Shohei Okawa, Masaharu Tanabashi, Masato Yamanaka
  • Journal Title: Phys. Rev. D Volume: 95 Issue: 2 Pages: 023006-023006
  • DOI: 10.1103/physrevd.95.023006
  • NAID: 120006331837
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Journal Article] Review of Particle Physics (2016)
  • Author(s): Particle Data Group (C. Patrignani, K. Agashe, G. Aielli, C. Amsler, M. Antonelli, D.M. Asner, H. Baer, Sw. Banerjee, R.M. Barnett, Y. Sumino, et al.)
  • Journal Title: Chinese Physics Volume: C40, no.10 Issue: 10 Pages: 1-1808
  • DOI: 10.1088/1674-1137/40/10/100001
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Unitarity sum rules, three-site moose model, and the ATLAS 2 TeV diboson anomalies (2015)
  • Author(s): T. Abe, R. Nagai, S. Okawa, M. Tanabashi
  • Journal Title: Physical Review D Volume: 92 Issue: 5 Pages: 055016-055016
  • DOI: 10.1103/physrevd.92.055016
  • Peer Reviewed / Open Access / Acknowledgement Compliant
• [Presentation] Symmetry and Geometry in Generalized Higgs sector (2019)
  • Author(s): Y. Uchida
  • Organizer: KMI2019
• [Presentation] Symmetry and Geometry in Generalized Higgs sector (2018)
  • Author(s): Y. Uchida
  • Organizer: Asian Linear COllider Workshop 2018
  • Int'l Joint Research
• [Presentation] Symmetry and Geometry in Generalized Higgs sector (2018)
  • Author(s): Y. Uchida
  • Organizer: Higgs Coupling 2018
  • Int'l Joint Research
• [Presentation] ヒッグス有効理論のカストディアル多重項を含む模型への応用 (2018)
  • Author(s): 内田祥紀、長井遼、棚橋誠治、津村浩二
  • Organizer: 日本物理学会第73回年次大会
• [Presentation] Roles of perturbative unitarity in extended Higgs scenarios (2015)
  • Author(s): Masaharu Tanabashi
  • Organizer: KIAS-CFHEP Workshop and the 5th KIAS Workshop on Particle Physics and Cosmology
  • Place of Presentation: KIAS, Seoul, Korea
  • Year and Date: 2015-11-09
  • Int'l Joint Research / Invited
• [Presentation] スリーサイト模型におけるW'とZ' (2015)
  • Author(s): 棚橋誠治
  • Organizer: テラスケール研究会
  • Place of Presentation: 東大理学部
  • Year and Date: 2015-06-27