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Measurement of Higgs Yukawa coupling to probe new era of high energy physics

Research Project

Project/Area Number 17KK0084
Research Category

Fund for the Promotion of Joint International Research (Fostering Joint International Research)

Allocation TypeMulti-year Fund
Research Field Particle/Nuclear/Cosmic ray/Astro physics
Research InstitutionThe University of Tokyo

Principal Investigator

MASUBUCHI Tatsuya  東京大学, 素粒子物理国際研究センター, 助教 (20512148)

Project Period (FY) 2018 – 2019
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥11,440,000 (Direct Cost: ¥8,800,000、Indirect Cost: ¥2,640,000)
Keywordsヒッグス粒子 / LHC / 湯川結合 / ボトムクォーク / ガス検出器 / MPGD / ヒッグス / 質量起源 / フェルミオン / 高抵抗薄膜
Outline of Final Research Achievements

The main achievement of this research is the first observation of the interaction of the Higgs boson with bottom quarks.
We searched for the decay of the Standard Model(SM) Higgs boson into a bbbar pair with the production in association with a W or Z boson at the LHC-ATLAS experiment. The study using the partial data of 13 TeV proton-proton collision at Run 2 is performed. An observed significance is 5.4 standard deviations with a combination with other searches for the H->bb. The VH production, which is the one of main production channels is also observed at the 5.3 standard deviations.
In the full Run 2 dataset, we measured differential cross sections as a function of the gauge boson transverse momentum in 30-80% uncertainties and found those are consistent with the SM expectations. We also constrained several dimension-6 operators in the effective field theory which contains new interactions expected in the beyond SM.

Academic Significance and Societal Importance of the Research Achievements

本研究の重要な成果である、ヒッグス粒子がボトムクォークに崩壊するモードの初観測は、標準模型のパラメータの一つであるヒッグス粒子とボトムクォークの結合が、標準模型の予想通り湯川結合で記述されていることを世界で初めて観測した結果である。これによって、すでに観測されていた崩壊モードと合わせて全ての第3世代クォーク・レプトンと標準模型ヒッグス粒子が結合することが明らかになり、素粒子物理の大きな謎の一つである世代の解明への試金石となった。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (17 results)

All 2020 2019 2018 Other

All Int'l Joint Research (1 results) Journal Article (5 results) (of which Int'l Joint Research: 5 results,  Open Access: 5 results,  Peer Reviewed: 2 results) Presentation (6 results) (of which Int'l Joint Research: 4 results,  Invited: 5 results) Remarks (4 results) Funded Workshop (1 results)

  • [Int'l Joint Research] 欧州原子核研究機構(CERN)(スイス)2018

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Measurements of WH and ZH production in the H→bb decay channel in pp collisions at 13TeV with the ATLAS detector2020

    • Author(s)
      ATLAS Collaboration
    • Journal Title

      ATLAS Conference Note

      Volume: ATLAS-CONF-2020-006

    • Related Report
      2019 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Journal Article] Measurement of the associated production of a Higgs boson decaying to b quarks with a vector boson at high transverse momentum in pp collisions at √s=13 TeV with the ATLAS detector2020

    • Author(s)
      ATLAS Collaboration
    • Journal Title

      ATLAS Conference Note

      Volume: ATLAS-CONF-2020-007

    • Related Report
      2019 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Journal Article] Observation of H→bb ̄ decays and VH production with the ATLAS detector2018

    • Author(s)
      Aaboud M. , Enari. Y, et. al. (The ATLAS collaboration)
    • Journal Title

      Physics Letters B

      Volume: 786 Pages: 59-86

    • DOI

      10.1016/j.physletb.2018.09.013

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Search for Higgs bosons produced via vector-boson fusion and decaying into bottom quark pairs in s=13??TeV pp collisions with the ATLAS detector2018

    • Author(s)
      ATLAS Collaboration (T. Masubuchi et al.)
    • Journal Title

      Physical Review D

      Volume: 98 Issue: 5 Pages: 052003-052003

    • DOI

      10.1103/physrevd.98.052003

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Measurement of VH, H→bbbar; production as a function of the vector-boson transverse momentum in 13 TeV pp collisions with the ATLAS detector2018

    • Author(s)
      ATLAS Collaboration
    • Journal Title

      ATLAS Conference Note

      Volume: ATLAS-CONF-2018-053

    • Related Report
      2018 Research-status Report
    • Open Access / Int'l Joint Research
  • [Presentation] Introduction ~Goal of Workshop ~2019

    • Author(s)
      Tatsuya Masubuchi
    • Organizer
      ATLAS H->bb Workshop
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] LHC ATLAS実験第2期運転の完了を受けたヒッグス測定と新物理探索の最新結果2019

    • Author(s)
      増渕達也
    • Organizer
      日本物理学会第74回年次大会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Recent Results and Future Prospacts of Higgs Physics at the LHC2019

    • Author(s)
      増渕達也
    • Organizer
      The 4th International Workship on Higgs as Probe of New Physics
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Measurements and searches of Higgs boson decays to two fermions2018

    • Author(s)
      増渕達也
    • Organizer
      CIPANP 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] VH->bb Status2018

    • Author(s)
      増渕達也
    • Organizer
      ATLAS Collaboration Week
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] LHC Higgs最新結果2018

    • Author(s)
      増渕達也
    • Organizer
      新テラスケール研究会 ~ヒッグス粒子発見後の素粒子物理学の新展開~
    • Related Report
      2018 Research-status Report
    • Invited
  • [Remarks] ATLAS Conference note 2020-006

    • URL

      https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2020-006/

    • Related Report
      2019 Annual Research Report
  • [Remarks] ATLAS Conference note 2020-007

    • URL

      https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/CONFNOTES/ATLAS-CONF-2020-007/

    • Related Report
      2019 Annual Research Report
  • [Remarks] プレスリリース Long-sought decay of Higgs boson observed

    • URL

      https://home.cern/news/press-release/physics/long-sought-decay-higgs-boson-observed

    • Related Report
      2018 Research-status Report
  • [Remarks] ヒッグス粒子とボトムクォークの結合、ついに初観測 物質の質量起源の解明

    • URL

      http://www.icepp.s.u-tokyo.ac.jp/information/20180828.html

    • Related Report
      2018 Research-status Report
  • [Funded Workshop] ATLAS H->bb Workshop2019

    • Related Report
      2019 Annual Research Report

URL: 

Published: 2018-01-25   Modified: 2021-02-19  

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