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2015 Fiscal Year Annual Research Report

ヒッグス粒子の発見による素粒子の質量起源の解明

Planned

Project AreaParticles Physics opening up the Tera-scale horizon using LHC
Project/Area Number 23104002
Research InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

徳宿 克夫  大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 所長 (80207547)

Co-Investigator(Kenkyū-buntansha) 受川 史彦  筑波大学, 数理物質科学研究科(系), 教授 (10312795)
海野 義信  大学共同利用機関法人高エネルギー加速器研究機構, その他部局等, 名誉教授 (40151956)
Project Period (FY) 2011-04-01 – 2016-03-31
Keywords素粒子実験 / ヒッグス粒子 / 標準理論 / ピクセル検出器 / 耐放射線検出器 / 国際研究者交流スイス
Outline of Annual Research Achievements

本研究は、LHCでの国際協力で建設されたアトラス検出器を用いてヒッグス粒子を発見し、ゲージ対称性の破れと質量の起源の謎の解明を目指す。LHCは重心系エネルギー7TeV及び8TeVでデータを収集した後長期シャットダウンに入り、2015年の春から13TeVでの衝突を開始し、研究終了までに3fb-1の積算ルミノシティを得た。
既に2012年に質量126GeVの新粒子を発見し、スピン・パリティなどの解析と通して、ヒッグス粒子と同定できていた。今年度は7及び8TeVのデータ全部を使って、Higgs粒子の様々な崩壊モードの観測を試みた。τ粒子対への崩壊が確認でき、ヒッグス粒子がフェルミ粒子と結合することを直接示す結果となった。その他様々な崩壊モードを測定し7,8TeVデータの解析をほぼ終結させた。
今年度収集した13TeVデータでの解析も進めている。データ量が少なくまだ「再発見」には至っていないが、解析手法は確立できた。
他の質量領域での第2のヒッグス粒子の探索も進めた。今年度の13TeVのデータで2光子の不変質量分布で750GeV付近に構造が見えている。現時点のデータ量ではこれが新粒子によるものかどうかはわからないが、加速器の性能が大きく改善しているので2016年のデータで決着できると考える。
ピクセル検出器の開発も順調に進んだ。放射線損傷後 飛跡検出効率が落ちる原因を究明し、素子のレイアウトの変更により、検出効率99%を維持できる事をビームテストで確認した。また、薄型センサー/薄型読み出しチップ(厚み150/150 μm)の接合(バンプボンディング)に於いても、バンプ接合不良を発生させる原因を特定し安定した接合技術を確立した。これらにより、ATLASアップグレードに向けてピクセルセンサーの重要な開発事項を完了し、実機製作への目処を付けることができた。

Research Progress Status

27年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

27年度が最終年度であるため、記入しない。

Research Products

(54 results)

All 2016 2015 Other

All Int'l Joint Research Journal Article Presentation Remarks

  • [Int'l Joint Research] CERN/ジュネーブ大学/ベルン大学(スイス)

    • Country Name
      スイス
    • Counterpart Institution
      CERN/ジュネーブ大学/ベルン大学
    • # of Other Institutions
      3
  • [Int'l Joint Research] ジェノバ大学/ローマ大学/レッチェ大学(イタリア)

    • Country Name
      イタリア
    • Counterpart Institution
      ジェノバ大学/ローマ大学/レッチェ大学
    • # of Other Institutions
      14
  • [Int'l Joint Research] DESY/ボン大学/ゲッチンゲン大学(ドイツ)

    • Country Name
      ドイツ
    • Counterpart Institution
      DESY/ボン大学/ゲッチンゲン大学
    • # of Other Institutions
      15
  • [Int'l Joint Research] カルフォルニア州立大バークレー校/BNL/SLAC(アメリカ)

    • Country Name
      アメリカ
    • Counterpart Institution
      カルフォルニア州立大バークレー校/BNL/SLAC
    • # of Other Institutions
      41
  • [Int'l Joint Research] オックスフォード大学/リバプール大学/ケンブリッジ大学(イギリス)

    • Country Name
      イギリス
    • Counterpart Institution
      オックスフォード大学/リバプール大学/ケンブリッジ大学
    • # of Other Institutions
      15
  • [Int'l Joint Research]

    • # of Other Countries
      37
  • [Journal Article] Search for invisible decays of a Higgs boson using vector-boson fusion in pp collisions at √s =8 TeV with the ATLAS detector2016

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Journal of High Energy Physics

      Volume: 01 Pages: 172

    • DOI

      10.1007/JHEP01(2016)172

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for a high-mass Higgs boson decaying to a W boson pair in pp collisions at √s = 8 TeV with the ATLAS detector2016

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Journal of High Energy Physics

      Volume: 01 Pages: 32

    • DOI

      10.1007/JHEP01(2016)032

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for new phenomena in events with at least three photons collected in pp collisions at √s= 8 TeV with the ATLAS detector2016

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      The European Physical Journal C

      Volume: 76 Pages: 210

    • DOI

      10.1140/epjc/s10052-016-4034-8

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for dark matter produced in association with a Higgs boson decaying to two bottom quarks in pp collisions at √s=8 TeV with the ATLAS detector2016

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Physical Review D

      Volume: 93 Pages: 072007

    • DOI

      10.1103/PhysRevD.93.072007

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Observation and measurement of Higgs boson decays to WW* with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Physical Review D

      Volume: 92 Pages: 012006

    • DOI

      10.1103/PhysRevD.92.012006

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Journal of High Energy Physics

      Volume: 4 Pages: 117

    • DOI

      10.1007/JHEP04(2015)117

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Constraints on the off-shell Higgs boson signal strength in the high-mass ZZ and WW final states with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      The European Physical Journal C

      Volume: 75 Pages: 335

    • DOI

      10.1140/epjc/s10052-015-3542-2

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Determination of spin and parity of the Higgs boson in the WW*→eνμν decay channel with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      The European Physical Journal C

      Volume: 75 Pages: 231

    • DOI

      10.1140/epjc/s10052-015-3518-2

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for a Charged Higgs Boson Produced in the Vector-boson Fusion Mode with Decay H±→W± Z using pp Collisions at sqrt(s)=8TeV with the ATLAS Experiment2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Physical Review Letters

      Volume: 115 Pages: 031801

    • DOI

      10.1103/PhysRevLett.115.031801

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for the Standard Model Higgs boson produced in association with top quarks and decaying into bb in pp collisions at sqrt(s)=8TeV with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      The European Physical Journal C

      Volume: 75 Pages: 349

    • DOI

      10.1140/epjc/s10052-015-3543-1

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Combined Measurement of the Higgs Boson Mass in pp Collisions at sqrt(s)=7 and 8 TeV with the ATLAS and CMS Experiments2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration, CMS Collaboration)
    • Journal Title

      Physical Review Letters

      Volume: 114 Pages: 191803

    • DOI

      10.1103/PhysRevLett.114.191803

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for invisible decays of the Higgs boson produced in association with a hadronically decaying vector boson in pp collisions at √s=8 TeV with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      The European Physical Journal C

      Volume: 75 Pages: 337

    • DOI

      10.1140/epjc/s10052-015-3551-1

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Measurements of the Total and Differential Higgs Boson Production Cross Sections Combining the H→γγ and H→ZZ ∗ →4ℓ Decay Channels at √s =8 TeV with the ATLAS Detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Physical Review Letters

      Volume: 115 Pages: 091801

    • DOI

      10.1103/PhysRevLett.115.091801

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for Higgs bosons decaying to aa in the μμττ final state in pp llisions at s √s = 8 TeV with the ATLAS experiment2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Physical Review D

      Volume: 92 Pages: 052002

    • DOI

      10.1103/PhysRevD.92.052002

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for new light gauge bosons in Higgs boson decays to four-lepton final states in pp collisions at sqrt(s)=8TeV with the ATLAS detector at the LHC2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Physical Review D

      Volume: 92 Pages: 092001

    • DOI

      10.1103/PhysRevD.92.092001

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for Higgs boson pair production in the bbbb final state from pp collisions at √s=8 TeV with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      The European Physical Journal C

      Volume: 75 Pages: 412

    • DOI

      10.1140/epjc/s10052-015-3628-x

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for Dark Matter in Events with Missing Transverse Momentum and a Higgs Boson Decaying to Two Photons in pp Collisions at √s=8 TeV with the ATLAS Detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Physical Review Letters

      Volume: 115 Pages: 131801

    • DOI

      10.1103/PhysRevLett.115.131801

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Modelling Z→ττprocesses in ATLAS with τ-embedded Z→μμ data2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Journal of Instrumentation

      Volume: 10 Pages: P09018

    • DOI

      10.1088/1748-0221/10/09/P09018

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Study of the spin and parity of the Higgs boson in diboson decays with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      The European Physical Journal C

      Volume: 75 Pages: 476

    • DOI

      10.1140/epjc/s10052-015-3685-1

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for the associated production of the Higgs boson with a top quark pair in multilepton final states with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Physics Letters B

      Volume: 749 Pages: 519-541

    • DOI

      10.1016/j.physletb.2015.07.079

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Study of (W/Z)H production and Higgs boson couplings using H→WW∗ decays with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Journal of High Energy Physics

      Volume: 08 Pages: 137

    • DOI

      10.1007/JHEP08(2015)137

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Measurements of the Higgs boson production and decay rates and coupling strengths using pp collision data at √s=7 and 8 TeV in the ATLAS experiment2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      The European Physical Journal C

      Volume: 76 Pages: 6

    • DOI

      10.1140/epjc/s10052-015-3769-y

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for an additional, heavy Higgs boson in the H→ZZ decay channel at √s = 8 TeV in pp collision data with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      The European Physical Journal C

      Volume: 76 Pages: 45

    • DOI

      10.1140/epjc/s10052-015-3820-z

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Constraints on non-Standard Model Higgs boson interactions in an effective Lagrangian using differential cross sections measured in the H→γγdecay channel at √s=8 TeV with the ATLAS detecto2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Physics Letters B

      Volume: 753 Pages: 69-85

    • DOI

      10.1016/j.physletb.2015.11.071

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for lepton-flavour-violating H→μτdecays of the Higgs boson with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Journal of High Energy Physics

      Volume: 11 Pages: 211

    • DOI

      10.1007/JHEP11(2015)211

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Constraints on new phenomena via Higgs boson couplings and invisible decays with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Journal of High Energy Physics

      Volume: 11 Pages: 206

    • DOI

      10.1007/JHEP11(2015)206

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Searches for Higgs boson pair production in the hh→bbττ, γγWW∗, γγbb, bbbb channels with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Physical Review D

      Volume: 92 Pages: 092004

    • DOI

      10.1103/PhysRevD.92.092004

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Search for flavour-changing neutral current top quark decays t→Hq in pp collisions at √s=8 TeV with the ATLAS detector2015

    • Author(s)
      G. Aad et al. (ATLAS Collaboration)
    • Journal Title

      Journal of High Energy Physics

      Volume: 12 Pages: 61

    • DOI

      10.1007/JHEP12(2015)061

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Journal Article] Irradiation and testbeam of KEK/HPK planar p-type pixel modules for HL-LHC2015

    • Author(s)
      K. Nakamura et al.
    • Journal Title

      Journal of Instrumentation

      Volume: 10 Pages: C06008

    • DOI

      10.1088/1748-0221/10/06/C06008

    • Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
  • [Presentation] Latest development in HPK/KEK n^+-in-p planar pixel sensors for very high radiation environments2016

    • Author(s)
      Y. Unno
    • Organizer
      11th "Trento" Workshop on Advanced Silicon Radiation Detectors
    • Place of Presentation
      Paris (France)
    • Year and Date
      2016-02-22 – 2016-02-24
    • Int'l Joint Research
  • [Presentation] Invisible Higgs decays and constraints on BSM Higgs2015

    • Author(s)
      S. Tsuno
    • Organizer
      Higgs Coupling 2015
    • Place of Presentation
      Lumley Castle (UK)
    • Year and Date
      2015-10-12 – 2015-10-15
    • Int'l Joint Research
  • [Presentation] Higgs boson interactions with the gauge sector (gg, WW, ZZ) in ATLAS2015

    • Author(s)
      T. Kishimoto
    • Organizer
      Higgs Coupling 2015
    • Place of Presentation
      Lumley Castle (UK)
    • Year and Date
      2015-10-12 – 2015-10-15
    • Int'l Joint Research
  • [Presentation] Development of n$^+$-in-p planar pixel sensors for very high radiation environments, designed to retain high efficiency after irradiation2015

    • Author(s)
      Y. Unno et al.
    • Organizer
      10th International "Hiroshima" Symposium on Development and Application of Semiconductor Tracking Detectors
    • Place of Presentation
      Xi'an (China)
    • Year and Date
      2015-09-26 – 2015-09-29
    • Int'l Joint Research
  • [Presentation] Test-beam evaluation of newly developed n^+-in-p planar pixel sensors aiming for use in high radiation environment2015

    • Author(s)
      K. Kimura et al.
    • Organizer
      10th International "Hiroshima" Symposium on Development and Application of Semiconductor Tracking Detectors
    • Place of Presentation
      Xi'an (China)
    • Year and Date
      2015-09-26 – 2015-09-29
    • Int'l Joint Research
  • [Presentation] Noise evaluation of silicon strip super-module with ABCN250 readout chips for ATLAS detector upgrade2015

    • Author(s)
      K. Todome et al.
    • Organizer
      10th International "Hiroshima" Symposium on Development and Application of Semiconductor Tracking Detectors
    • Place of Presentation
      Xi'an (China)
    • Year and Date
      2015-09-26 – 2015-09-29
    • Int'l Joint Research
  • [Presentation] Charge Collection and Field Profile Studies in Heavily Irradiated Silicon Strip Sensors for the ATLAS Inner Tracker Upgrade2015

    • Author(s)
      K. Hara et al.
    • Organizer
      10th International "Hiroshima" Symposium on Development and Application of Semiconductor Tracking Detectors
    • Place of Presentation
      Xi'an (China)
    • Year and Date
      2015-09-26 – 2015-09-29
    • Int'l Joint Research
  • [Presentation] Study of Surface Properties of ATLAS12 Strip Sensors and their Radiation Resistance2015

    • Author(s)
      M. Mikestikova et al.
    • Organizer
      10th International "Hiroshima" Symposium on Development and Application of Semiconductor Tracking Detectors
    • Place of Presentation
      Xi'an (China)
    • Year and Date
      2015-09-26 – 2015-09-29
    • Int'l Joint Research
  • [Presentation] Properties of Full-Size ATLAS12 Sensors2015

    • Author(s)
      B. Hommels et al.
    • Organizer
      10th International "Hiroshima" Symposium on Development and Application of Semiconductor Tracking Detectors
    • Place of Presentation
      Xi'an (China)
    • Year and Date
      2015-09-26 – 2015-09-29
    • Int'l Joint Research
  • [Presentation] Silicon sensor study for the forward strip tracker of the ATLAS experiment for the HL-LHC2015

    • Author(s)
      R. Mori et al
    • Organizer
      10th International "Hiroshima" Symposium on Development and Application of Semiconductor Tracking Detectors
    • Place of Presentation
      Xi'an (China)
    • Year and Date
      2015-09-26 – 2015-09-29
    • Int'l Joint Research
  • [Presentation] Embedded pitch adapters: a high-yield interconnection solution for strip sensors2015

    • Author(s)
      M. Ullan et al.
    • Organizer
      10th International "Hiroshima" Symposium on Development and Application of Semiconductor Tracking Detectors
    • Place of Presentation
      Xi'an (China)
    • Year and Date
      2015-09-26 – 2015-09-29
    • Int'l Joint Research
  • [Presentation] ATLAS results on jet-related physics with V+jets2015

    • Author(s)
      K. Nagano
    • Organizer
      3rd Large Hadron Collider Phyesics (LHCP2015)
    • Place of Presentation
      St. Petersburg (Russia)
    • Year and Date
      2015-08-31 – 2015-09-05
    • Int'l Joint Research
  • [Presentation] Higgs Boson and and Flavor at the ATLAS and CMS Experiments2015

    • Author(s)
      H. Okawa
    • Organizer
      SUSY2015, 23rd International Conference on Supersymmetry and Unification of Fundamental Interactions
    • Place of Presentation
      Lake Tahoe (USA)
    • Year and Date
      2015-08-23 – 2015-08-29
    • Int'l Joint Research
  • [Presentation] ATLAS difermion results2015

    • Author(s)
      K. Nakamura
    • Organizer
      Higgs Hunting 2015
    • Place of Presentation
      Paris (France)
    • Year and Date
      2015-07-30 – 2015-08-01
    • Int'l Joint Research
  • [Presentation] Latest results on Higgs final-states with photons in ATLAS2015

    • Author(s)
      Y. Yamaguchi
    • Organizer
      Photon 2015
    • Place of Presentation
      Novosibirsk (Russia)
    • Year and Date
      2015-06-15 – 2015-06-19
    • Int'l Joint Research
  • [Presentation] Study of Higgs boson production in bosonic decay channels at the LHC (incl. off-shell production)2015

    • Author(s)
      S. Oda
    • Organizer
      Blois 2015
    • Place of Presentation
      Blois (France)
    • Year and Date
      2015-05-31 – 2015-06-05
    • Int'l Joint Research
  • [Remarks] ATLAS実験日本グループのWebページ

    • URL

      http://atlas.kek.jp/index.html

  • [Remarks] ATLAS実験の一般向けWebページ(英語)

    • URL

      http://atlas.ch/

  • [Remarks] ATLAS実験の物理成果のWebページ(英語)

    • URL

      https://twiki.cern.ch/twiki/bin/view/AtlasPublic

URL: 

Published: 2017-01-06  

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