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ヒッグス粒子発見後の素粒子物理学の新展開~LHCによる真空と時空構造の解明~

Administrative Group

Project AreaNew expansion of particle physics of post-Higgs era by LHC revealing the vacuum and space-time structure
Project/Area Number 16H06488
Research Category

Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Allocation TypeSingle-year Grants
Review Section Science and Engineering
Research InstitutionThe University of Tokyo

Principal Investigator

浅井 祥仁  東京大学, 大学院理学系研究科(理学部), 教授 (60282505)

Project Period (FY) 2016-06-30 – 2021-03-31
Project Status Granted (Fiscal Year 2020)
Budget Amount *help
¥21,840,000 (Direct Cost: ¥16,800,000、Indirect Cost: ¥5,040,000)
Fiscal Year 2020: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2019: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2018: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2017: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2016: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
KeywordsLHC / 超対称性粒子 / ヒッグス粒子 / 暗黒物質
Outline of Annual Research Achievements

ヒッグス粒子の発見により、「素粒子」自体の研究から、素粒子を使って「時空や真空」を探る新しい段階へ進みつつある。本領域は、衝突エネルギーを倍増させたLHC加速器を用いて、H27年度からH30年度まで合わせて、170fb-1近いデータを収集できた。予測を超える大きな成果が得られた。1) ヒッグス粒子と他の素粒子との結合の強さを測定した。物質を形成するフェルミオンとの結合も測定し、ボトムクォーク、トップクォーク、タウレプトンとの結合の強さを誤差10-20%で測定した。力を伝えるゲージ粒子ばかりでなく、フェルミ粒子の質量起源もヒッグス粒子であることが分かった。2) 世代の解明:また、第2世代の素粒子であるミュー粒子とヒッグス粒子の結合の強さを測定し、世代の違いをヒッグス粒子が作っていること分かった。3)ヒッグス粒子などの精密測定より、我々の宇宙が安定ではなく、準安定であることが分かった。これは、我々の宇宙の真空が一番エネルギーが低いのではなく、別の最低エネルギーに相当する状態があることを示すものであり、新現象の存在を示唆する結果である。この新現象が何に対応しているかの研究を領域全体で進めている。最近観測されている、フレーバー関係の精密測定と標準理論の予言からの乖離や、muonのg-2の精密測定の結果のズレ、暗黒物質などの成果を包含して、新しい現象の可能性とLHCでの観測が期待される素粒子現象について、複数の可能性まで絞り込んだ。理論と実験や幅広い研究者が参加しており、LHCの第3期実験や公募研究での他の研究と合わせて、その可能性を検証できることがわかった。

Current Status of Research Progress
Current Status of Research Progress

2: Research has progressed on the whole more than it was originally planned.

Reason

H27年度からH30年度まで合わせて、170fb-1近いデータを収集できた。これから、これらのデータを用いた解析を進め、上の成果が示す様に多くの成果が得られた。新現象のヒントが、どのような物理現象によるものなのかなどの議論を領域全体で進めている。令和2年度は、新型コロナウィルスの影響で、国際会議がキャンセルされるなどの影響を強く受けた。本領域の準備していた国際会議も、1年延期し、テラスケール研究会もオンライン開催になるなどの、研究発表を行い、議論を深める場の確保と言う点では、大きな影響を受けた。

Strategy for Future Research Activity

H27年度からH30年度まで合わせて、170fb-1近いデータを収集できた。それらのデータの解析を進め、 1)現在観測されている小さな乖離(2-3σ程度)の理解、LHCbでのアノマリーに対応する探索を進め、muon g-2などの成果と、合わせて本領域で得られたヒントと結びつける研究を領域全体で進める。 2)1)で鍵となるのは、超対称性粒子が暗黒物質となるニュートラリノとの質量差が比較的小さい領域であり、従来の研究ではカバーできていない。検出器の理解やバックグラウンドの理解が鍵になるため、領域全体や公募研究の成果とあわせて情報を共有して研究を進めていく。

Report

(4 results)
  • 2019 Annual Research Report
  • 2018 Annual Research Report
  • 2017 Annual Research Report
  • 2016 Annual Research Report

Research Products

(57 results)

All 2021 2020 2019 2018 2017 Other

All Int'l Joint Research (24 results) Journal Article (10 results) (of which Int'l Joint Research: 10 results,  Peer Reviewed: 10 results,  Open Access: 10 results) Presentation (12 results) (of which Int'l Joint Research: 11 results,  Invited: 2 results) Funded Workshop (11 results)

  • [Int'l Joint Research] INFN Roma-I/INFN Pisa/University of Florence(イタリア)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] CERN(スイス)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] SLAC/Boston University/University of Michigan(米国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Max-Plank Institute(ドイツ)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Durham University/University of Cambridge(英国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] INFN Roma-I/INFN Pisa/University of Florence(イタリア)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] CERN(スイス)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] SLAC/Boston University/University of Michigan(米国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Mac-Planck Institute(ドイツ)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] Durham University/University of Cambridge(英国)

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2018 Annual Research Report
  • [Int'l Joint Research] INFN Roma-I/INFN Pisa/University of Florence(イタリア)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] CERN(スイス)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] SLAC/Boston University/University of Michigan(米国)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] Mac-Planck Institute(ドイツ)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] Durham University/University of Cambridge(英国)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] INFN Roma-I/INFN Pisa/University of Florence(イタリア)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] CERN(スイス)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] SLAC/Boston University/University of Michigan(米国)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] Mac-Planck Institute(ドイツ)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research] Durham University/University of Cambridge(英国)

    • Related Report
      2016 Annual Research Report
  • [Int'l Joint Research]

    • Related Report
      2016 Annual Research Report
  • [Journal Article] Measurement of the associated production of a Higgs boson decaying into b-quarks with a vector boson at high transverse momentum in pp collisions at √s=13 TeV with the ATLAS detector2021

    • Author(s)
      The ATLAS Collaboration (S.Asai et al)
    • Journal Title

      Physics Letters B

      Volume: 816 Pages: 136204-136204

    • DOI

      10.1016/j.physletb.2021.136204

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] A search for the dimuon decay of the Standard Model Higgs boson with the ATLAS detector2021

    • Author(s)
      ATLAS Collaboration
    • Journal Title

      Physics Letters B

      Volume: 812 Pages: 135980-135980

    • DOI

      10.1016/j.physletb.2020.135980

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Search for long-lived, massive particles in events with displaced vertices and missing transverse momentum in sqrt(s) = 13 TeV pp collisions with the ATLAS detector2018

    • Author(s)
      M. Aaboud, K. Hanagaki, J. Tojo, F. Ukegawa, et al. [ATLAS Collaboration]
    • Journal Title

      Phys. Rev. D

      Volume: 97 Issue: 5 Pages: 52012-52012

    • DOI

      10.1103/physrevd.97.052012

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Evidence for the associated production of the Higgs boson and a top quark pair with the ATLAS detector2018

    • Author(s)
      ATLAS Collaboration
    • Journal Title

      Physical Review D

      Volume: 97 Issue: 7 Pages: 072003-072003

    • DOI

      10.1103/physrevd.97.072003

    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Search for W W/W Z resonance production in lvqq final states in pp collisions at √s = 13 TeV with the ATLAS detector2018

    • Author(s)
      The ATLAS collaboration (M. Aaboud, M. Ishino, H. Nanjo, T. Sumida, K. Yorita et al.)
    • Journal Title

      Journal of High Energy Physics

      Volume: 3 Issue: 3 Pages: 42-42

    • DOI

      10.1007/jhep03(2018)042

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Model independent evaluation of the Wilson coefficient of the Weinberg operator in QCD2018

    • Author(s)
      T. Abe, J. Hisano and R. Nagai
    • Journal Title

      Journal of High Energy Physics

      Volume: 3 Pages: 175-175

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Search for squarks and gluinos in events with an isolated lepton, jets, and missing transverse momentum at √ s = 13 TeV with the ATLAS detector2017

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

      Physical Review D

      Volume: 96 Issue: 11 Pages: 112010-112010

    • DOI

      10.1103/physrevd.96.112010

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Evidence for the H→bb decay with the ATLAS detector2017

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

      Journal of High Energy Physics

      Volume: 2017 Issue: 12 Pages: 024-092

    • DOI

      10.1007/jhep12(2017)024

    • Related Report
      2017 Annual Research Report 2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Search for new phenomena with large jet multiplicities and missing transverse momentum using large-radius jets and flavour-tagging at ATLAS in 13 TeV pp collisions2017

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

      Journal of High Energy Physics

      Volume: 12 Issue: 12 Pages: 1-50

    • DOI

      10.1007/jhep12(2017)034

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Subnanosecond time-to-digital converter implemented in a Kintex-7 FPGA2017

    • Author(s)
      Sano Y.、Horii Y.、Ikeno M.、Sasaki O.、Tomoto M.、Uchida T.
    • Journal Title

      Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment

      Volume: 874 Pages: 50-56

    • DOI

      10.1016/j.nima.2017.08.038

    • Related Report
      2016 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 「素粒子物理実験」とAIの接点2019

    • Author(s)
      田中 純一
    • Organizer
      JSAI2019
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] Search for additional neutral Higgs bosons in the MSSM2018

    • Author(s)
      J. Tanaka
    • Organizer
      ICHEP2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Status and highlights from the ATLAS experiment2018

    • Author(s)
      K. Nagano
    • Organizer
      LHCP2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Single Event Upsets in the ATLAS IBL Frontend ASICs2018

    • Author(s)
      Y. Takubo
    • Organizer
      Pixel2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Study of efficiency and noise of fine pitch planar pixel detector for ATLAS ITk upgrade2018

    • Author(s)
      K. Nakamura
    • Organizer
      Pixel2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Searches for new physics in final states with top quarks with ATLAS2018

    • Author(s)
      M. Aoki
    • Organizer
      LHCP2018
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Coupling and mass with 13 TeV data and expectations2017

    • Author(s)
      S. Oda
    • Organizer
      52nd Recontres de Moriond in Electroweak Interactions and Unified Thories
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Measurements of ttbar+X using the ATLAS detector2017

    • Author(s)
      K. Kawade
    • Organizer
      EPS-HEP 2017
    • Related Report
      2017 Annual Research Report
    • Int'l Joint Research
  • [Presentation] ATLAS Detector Performance in Run2 and Upgrade Plans2017

    • Author(s)
      Masaya Ishino (for ATLAS collaboration)
    • Organizer
      High-Energy Physics International Conference in Quantum Chromodynamics
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Mono-jet searches2017

    • Author(s)
      Osamu Jinnouchi (for ATLAS and CMS collaborations)
    • Organizer
      DM @ LHC 2017
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Baryon-number violating nucleon decay - Review from theoretical2017

    • Author(s)
      Junji Hisano
    • Organizer
      NNN17
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Searches for Beyond SM Higgs bosons2017

    • Author(s)
      Soshi Tsuno
    • Organizer
      The 28th International Symposium on Lepton Photon Interactions at High Energies
    • Related Report
      2016 Annual Research Report
    • Int'l Joint Research
  • [Funded Workshop] Dark Matter searches in the 2020s2020

    • Related Report
      2019 Annual Research Report
  • [Funded Workshop] KEK-PH20202020

    • Related Report
      2019 Annual Research Report
  • [Funded Workshop] HPNP20192019

    • Related Report
      2018 Annual Research Report
  • [Funded Workshop] DIS20182018

    • Related Report
      2018 Annual Research Report
  • [Funded Workshop] ATLAS Overview Week2018

    • Related Report
      2018 Annual Research Report
  • [Funded Workshop] HC20182018

    • Related Report
      2018 Annual Research Report
  • [Funded Workshop] 新テラスケール研究会2018

    • Related Report
      2017 Annual Research Report
  • [Funded Workshop] AJ物理ワークショップ2018

    • Related Report
      2017 Annual Research Report
  • [Funded Workshop] 新テラスケール研究会2017

    • Related Report
      2016 Annual Research Report
  • [Funded Workshop] Anomaries in b to sll and its implications2017

    • Related Report
      2016 Annual Research Report
  • [Funded Workshop] 新テラスケール研究会2017

    • Related Report
      2016 Annual Research Report

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Published: 2016-07-04   Modified: 2022-02-22  

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