トップクォークで探る真空と時空

• Project Area: New expansion of particle physics of post-Higgs era by LHC revealing the vacuum and space-time structure
• Project/Area Number: 16H06493
• Research Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
• Allocation Type: Single-year Grants
• Review Section: Science and Engineering
• Research Institution: Nagoya University
• Principal Investigator: 戸本 誠 名古屋大学, 理学研究科, 特任教授 (80432235)
• Co-Investigator(Kenkyū-buntansha): 山崎 祐司 神戸大学, 理学研究科, 教授 (00311126)
• Project Period (FY): 2016-06-30 – 2021-03-31
• Project Status: Granted (Fiscal Year 2020)
• Budget Amount: ¥156,000,000 (Direct Cost: ¥120,000,000、Indirect Cost: ¥36,000,000); Fiscal Year 2020: ¥29,250,000 (Direct Cost: ¥22,500,000、Indirect Cost: ¥6,750,000); Fiscal Year 2019: ¥29,250,000 (Direct Cost: ¥22,500,000、Indirect Cost: ¥6,750,000); Fiscal Year 2018: ¥29,250,000 (Direct Cost: ¥22,500,000、Indirect Cost: ¥6,750,000); Fiscal Year 2017: ¥29,250,000 (Direct Cost: ¥22,500,000、Indirect Cost: ¥6,750,000); Fiscal Year 2016: ¥39,000,000 (Direct Cost: ¥30,000,000、Indirect Cost: ¥9,000,000)
• Keywords: 素粒子実験 / トップクォーク / LHC-ATLAS実験 / LHC-ALTAS実験

Outline of Annual Research Achievements

2012年までに収集した重心系エネルギー7, 8 TeV、2015年から2018年度までに収集した重心系エネルギー13 TeV、140 /fbの陽子陽子衝突データを用いて、トップクォークに関する以下の研究を推進した。
（1）複数のジェットを随伴するトップクォーク対生成の微分断面積測定などを行った。トップクォークのハドロン崩壊終状態、トップクォーク測定のバックグラウンドの理解に関連の深い、多重散乱モデル、ハドロン終状態の形状の測定を進めた。
（2）B01班と連携して、トップクォークの湯川結合に不可欠なttH過程の世界初観測を実現した。ヒッグス粒子の様々な崩壊過程を用いて6.3σの統計的有意度でttH生成断面積の測定に成功した。
（3）t→qZやt→qHなどの希過程の探索を行い、それらの崩壊分岐比の上限を1/1000から1/10000のレベルにまで下げた。トップクォーク対の荷電非対称度の測定による新物理探索を行なった。
（4）4トップクォーク過程やトップクォーク対に崩壊する重い共鳴粒子の探索を行なった。さらには、スカラートップクォーク、ニュートラリーノ、チャージーノの3種の超対称性粒子の質量差に応じたスカラートップクォークの探索を行なった。これはA01班との連携研究である。
「統合型μ粒子」の開発に関しては、2017年度の研究でまとめた技術仕様設計書（TDR）に基づき、TGC飛跡トリガー、MDT飛跡トリガーで用いる予定のトリガー回路のの量産化に向けた放射線耐性試験を名古屋大学のCo照射施設、神戸大学のタンデム加速器施設にて実施した。また、大規模FPGAを用いたトリガー論理回路のデザインも開始した。第3実験に向けたマルチスレッド対応のソフトウェアトリガーの開発も進めた。

Current Status of Research Progress

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

Reason

計画調書に記載した（1）テラスケール領域におけるQCDの性質の理解、（2）トップクォークの湯川結合による「真空」の解明、（3）新物理の間接的探索、（4）新物理の直接的探索と「時空」の解明、の全てに対して研究実績で記述した研究成果を新しく出し、その成果を学術論文や国内外の会議で発表した。（2）に関連するttHの世界初観測が2018年度の研究の最大の成果である。当初は第3実験のデータを用いて実現されると思われていたが、この過程の背景事象となるトップクォーク対事象をあらかじめ理解できていたこと、機械学習などを積極的に取り入れたことにより第2実験での測定を達成した。
「統合型μ粒子トリガー」の開発では、高輝度LHC実験に向けた順調にR&Dが進んでいる。特に、2018年度は、μ粒子トリガーの前段回路で使用予定の回路素子の放射線耐性試験を精力的に実施し、素子が高輝度LHC実験の高放射線環境下でも耐えうること立証できた。
以上の観点により、概ね順調に進んでいると言える。

Strategy for Future Research Activity

2019年度と2020年度はLHC加速器はシャットダウンする。この期間に進めるべき研究は、①2018年度までに取得したデータを用いたトップクォークの研究、② 第3実験に向けたソフトウェアトリガーとトップクォーク物理の解析の準備、③ 高輝度LHC実験に向けたトリガー回路のR&Dの3点があげられる。①では、140 /fbの全データを用いたトップクォークの質量精密測定やトップクォークをプローブとした新物理の間接・直接測定を推進する。②ではシミュレーションを用いて第3実験におけるトップクォーク物理に関する感度予想などを追及し、第3実験でデータ収集を行うためのマルチスレッド対応のソフトウェアトリガーを完成させる。③では、検出器近くに設置する前段回路の量産プロトタイプ回路の開発を進めるとともに、大規模FPGAを用いたトリガー論理回路を完成させる。

Research Products

• [Int'l Joint Research] CERN(スイス)
• [Int'l Joint Research] マックスプランク研究所(ドイツ)
• [Int'l Joint Research] ローマ大学/ボローニャ大学(イタリア)
• [Int'l Joint Research] ミシガン大学(米国)
• [Int'l Joint Research] ロンドン大学(英国)
• [Int'l Joint Research]
• [Int'l Joint Research] CERN(スイス)
• [Int'l Joint Research] マックスプランク研究所(ドイツ)
• [Int'l Joint Research] ミシガン大学(米国)
• [Int'l Joint Research] ローマ大学/ボローニャ大学(イタリア)
• [Int'l Joint Research] ロンドン大学(英国)
• [Int'l Joint Research]
• [Int'l Joint Research] CERN(スイス)
• [Int'l Joint Research] マックスプランク研究所(ドイツ)
• [Int'l Joint Research] ローマ大学/ボローニャ大学(イタリア)
• [Int'l Joint Research] ミシガン大学(アメリカ)
• [Int'l Joint Research] ロンドン大学(イギリス)
• [Int'l Joint Research]
• [Journal Article] Search for four-top-quark production in the single-lepton and opposite-sign dilepton final states in pp collisions at sqrt{s}=13 TeV with the ATLAS detector (2019)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Physical Review D Volume: 99 Pages: 52009-52009
  • DOI: 10.1103/physrevd.99.052009
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Search for new phenomena in events with same-charge leptons and b-jets in pp collisions at sqrt{s}=13 TeV with the ATLAS detector (2018)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2018 Pages: 39-39
  • DOI: 10.1007/jhep12(2018)039
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Probing the Quantum Interference between Singly and Doubly Resonant Top-Quark Production in pp Collisions at sqrt{s}=13 TeV with the ATLAS Detector (2018)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Physics Review Letters Volume: 121 Pages: 152002-152002
  • DOI: 10.1103/physrevlett.121.152002
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Search for flavor-changing neutral currents in top quark decays t→Hc and t→Hu in multilepton final states in proton-proton collisions at sqrt{s}=13 TeV with the ATLAS detector (2018)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Physical Review D Volume: 98 Pages: 32002-32002
  • DOI: 10.1103/physrevd.98.032002
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of colour flow using jet-pull observables in ttbar events with the ATLAS experiment at sqrt{s}=13 TeV (2018)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: The European Physical Journal C Volume: 78 Pages: 847-847
  • DOI: 10.1140/epjc/s10052-018-6290-2
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Search for heavy particles decaying into top-quark pairs using lepton-plus-jets events in proton_proton collisions at sqrt{s}=13 TeV with the ATLAS detector (2018)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: The European Physical Journal C Volume: 78 Pages: 565-565
  • DOI: 10.1140/epjc/s10052-018-5995-6
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Search for flavour-changing neutral current top-quark decays t → qZ in proton-proton collisions at sqrt{s}=13 TeV with the ATLAS detector (2018)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2018 Pages: 176-176
  • DOI: 10.1007/jhep07(2018)176
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurements of differential cross sections of top quark pair production in association with jets in pp collisions at sqrt{s}=13 TeV using the ATLAS detector (2018)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2018 Pages: 159-159
  • DOI: 10.1007/jhep10(2018)159
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurements of differential cross-sections of highly boosted top quarks decaying to all-hadronic final states in collisions at using the ATLAS detector (2018)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Physical Review D Volume: 98 Pages: 12003-12003
  • DOI: 10.1103/physrevd.98.012003 10.1103/PHYSREVD.98.012003
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Combination of inclusive and differential ttbar charge asymmetry measurements using ATLAS and CMS data at sqrt{s}=7 and 8 TeV (2018)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2018 Pages: 33-33
  • DOI: 10.1007/jhep04(2018)033
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of the production cross-section of a single top quark in association with a Z boson in proton-proton collisions at 13 TeV with the ATLAS detector (2018)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Physics Letters B Volume: 780 Pages: 557-577
  • DOI: 10.1016/j.physletb.2018.03.023
  • 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 detector (2018)
  • Author(s): ATLAS Collaboration
  • Journal Title: Physical Review D Volume: 97 Pages: 072003-072003
  • DOI: 10.1103/physrevd.97.072003
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Search for the standard model Higgs boson produced in association with top quarks and decaying into a bbar pair in pp collisions at sqrt{s}=13__TeV with the ATLAS detector (2018)
  • Author(s): M. Aaboud, K. Hanagaki, et al. [ATLAS Collaboration]
  • Journal Title: Physical Review D Volume: 97 Pages: 72016-72016
  • DOI: 10.1103/physrevd.97.072016
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector (2018)
  • Author(s): M. Aaboud, K. Hanagaki, J. Tojo, F. Ukegawa, et al. [ATLAS Collaboration]
  • Journal Title: Physics Letters B Volume: 784 Pages: 173-173
  • DOI: 10.1016/j.physletb.2018.07.035
  • NAID: 120006542239
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Search for top-squark pair production in final states with one lepton, jets, and missing transverse momentum using 36 fb－1_of √s=13 TeV_pp_collision data with the ATLAS detector (2018)
  • Author(s): T. Saito et al., The ATLAS Collaboration
  • Journal Title: J. High Energ. Phys. Volume: 2018 Pages: 108-108
  • DOI: 10.1007/jhep06(2018)108
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of differential cross-sections of a single top quark produced in association with a W boson at sqrt{s}=13 TeV with ATLAS (2018)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: The European Physical Journal C Volume: 78 Pages: 186-186
  • DOI: 10.1140/epjc/s10052-018-5649-8
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Direct top-quark decay width measurement in the ttbar lepton+jets channel at sqrt{s}=8 TeV with the ATLAS experiment (2018)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: The European Physical Journal C Volume: 78 Pages: 129-129
  • DOI: 10.1140/epjc/s10052-018-5595-5
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of the cross-section for producing a W boson in association with a single top quark in pp collisions at sqrt{s}=13 TeV with ATLAS (2018)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2018 Pages: 63-63
  • DOI: 10.1007/jhep01(2018)063
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of lepton differential distributions and the top quark mass in ttbar production in pp collisions at sqrt{s}=8 TeV with the ATLAS detector (2017)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: The European Physical Journal C Volume: 77 Pages: 804-804
  • DOI: 10.1140/epjc/s10052-017-5349-9
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurements of top-quark pair differential cross-sections in the lepton+jets channel in pp collisions at sqrt{s}=13 TeV using the ATLAS detector (2017)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2017 Pages: 191-191
  • DOI: 10.1007/jhep11(2017)191
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Analysis of the Wtb vertex from the measurement of triple-differential angular decay rates of single top quarks produced in the t-channel at sqrt{s}=8 TeV with the ATLAS detector (2017)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2017 Pages: 17-17
  • DOI: 10.1007/jhep12(2017)017
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Search for top quark decays t → qH, with H → γγ, in sqrt{s}=13 TeV pp collisions using the ATLAS detector (2017)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2017 Pages: 129-129
  • DOI: 10.1007/jhep10(2017)129
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of the ttbar+γ production cross section in proton-proton collisions at sqrt{s}=8 TeV with the ATLAS detector (2017)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2017 Pages: 86-86
  • DOI: 10.1007/jhep11(2017)086
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of the ttbar production cross section in the τ+jets final state in pp collisions at squr{s}=8 TeV using the ATLAS detector (2017)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Physical Review D Volume: 95 Pages: 72003-72003
  • DOI: 10.1103/physrevd.95.072003
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Probing the W tb vertex structure in t-channel single-top-quark production and decay in pp collisions at sqrt{s}=8 TeV with the ATLAS detector (2017)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2017 Pages: 124-124
  • DOI: 10.1007/jhep04(2017)124
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Top-quark mass measurement in the all-hadronic tt decay channel at sqrt(s)=8 TeV with the ATLAS detector (2017)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2017 Pages: 118-118
  • DOI: 10.1007/jhep09(2017)118
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Fiducial, total and differential cross-section measurements of t-channel single top-quark production in pp collisions at 8 TeV using data collected by the ATLAS detector (2017)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: The European Physical Journal C Volume: 77 Pages: 531-531
  • DOI: 10.1140/epjc/s10052-017-5061-9
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurements of top-quark pair differential cross-sections in the eμ channel in pp collisions at sqrt{s}=13 TeV using the ATLAS detector (2017)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: The European Physical Journal C Volume: 77 Pages: 292-292
  • DOI: 10.1140/epjc/s10052-017-4821-x
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of the W boson polarisation in ttbar events from pp collisions at sqrt{s}=8 TeV in the lepton+jets channel with ATLAS (2017)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: The European Physical Journal C Volume: 77 Pages: 264-264
  • DOI: 10.1140/epjc/s10052-017-4819-4
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of jet activity produced in top-quark events with an electron, a muon and two b-tagged jets in the final state in pp collisions at sqrt{s}=13 TeV with the ATLAS detector (2017)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: The European Physical Journal C Volume: 77 Pages: 220-220
  • DOI: 10.1140/epjc/s10052-017-4766-0
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of the inclusive cross-sections of single top-quark and top-antiquark t-channel production in pp collisions at sqrt{s}=13 TeV with the ATLAS detector (2017)
  • Author(s): M. Aabound, Y. Horii, J. Maeda, O. Sasaki, M. Tomoto, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2017 Pages: 86-86
  • DOI: 10.1007/jhep04(2017)086
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of the ttZ and ttW production cross sections in multilepton final states using 3.2 /fb of pp collisinos at sqrt(s) = 13 TeV with the ATLAS detector (2017)
  • Author(s): 1.M. Aaboud, M. Tomoto, Y. Horii, J. Maeda, O. Sasaki, S. Shimizu, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: The European Physics Journal C Volume: 77 Pages: 40-40
  • DOI: 10.1140/epjc/s10052-016-4574-y
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of charge and CP asymmetries in b-hadron decays using top-quark events collected by the ATLAS detector in pp collisions at sqrt(s) = 8 TeV (2017)
  • Author(s): 1.M. Aaboud, M. Tomoto, Y. Horii, J. Maeda, O. Sasaki, S. Shimizu, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2017 Pages: 71-71
  • DOI: 10.1007/jhep02(2017)071
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of top-qaruk pair to Z-boson cross-section ratios in sqrt(s) = 13, 8, 7 TeV with the ATLAS detector (2017)
  • Author(s): 1.M. Aaboud, M. Tomoto, Y. Horii, J. Maeda, O. Sasaki, S. Shimizu, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2017 Pages: 117-117
  • DOI: 10.1007/jhep02(2017)117
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurements of the charge asymmetry in top-quark pair production in the dilepton final state at sqrt(s)=8 TeV with the ATLAS detector (2016)
  • Author(s): 1.M. Aaboud, M. Tomoto, Y. Horii, J. Maeda, O. Sasaki, S. Shimizu, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Physical Review D Volume: 94 Pages: 032006-032006
  • DOI: 10.1103/physrevd.94.032006
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of the top quark mass in the ttbar → dilepton channel from sqrt(s) = 8 TeV ATLAS data (2016)
  • Author(s): 1.M. Aaboud, M. Tomoto, Y. Horii, J. Maeda, O. Sasaki, S. Shimizu, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Phyiscs Letter B Volume: 761 Pages: 350-371
  • DOI: 10.1016/j.physletb.2016.08.042
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of the ttbar production cross-section using eμ events with b-tagged jets in pp collisions at sqrt(s) = 13 TeV with the ATLAS detector (2016)
  • Author(s): 1.M. Aaboud, M. Tomoto, Y. Horii, J. Maeda, O. Sasaki, S. Shimizu, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Phyiscs Letter B Volume: 761 Pages: 136-157
  • DOI: 10.1016/j.physletb.2016.08.019
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of top quark pair differential cross sections in the dilepton channel in pp collisions at sqrt(s) = 7 and 8 TeV with ATLAS (2016)
  • Author(s): 1.M. Aaboud, M. Tomoto, Y. Horii, J. Maeda, O. Sasaki, S. Shimizu, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Physical Review D Volume: 94 Pages: 092003-092003
  • DOI: 10.1103/physrevd.94.092003
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Development of a sub-nanosecond time-to-digital converter based on a field-programmable gate array (2016)
  • Author(s): Y. Sano, M. Tomoto, Y. Horii,a O. Sasaki, et. al.
  • Journal Title: Journal of Instrumentation Volume: 11
  • DOI: 10.1088/1748-0221/11/03/c03053
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of jet activity in top quark events using the eμ final state with two b-tagged jets in pp collisions at s = 8 $$ \sqrt{s}=8 $$ TeV with the ATLAS detector (2016)
  • Author(s): 1.M. Aaboud, M. Tomoto, Y. Horii, J. Maeda, O. Sasaki, S. Shimizu, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2016 Pages: 74-74
  • DOI: 10.1007/jhep09(2016)074
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of the centrality dependence of the charged-particle pseudorapidity distribution in proton-lead collisions at sqrt(sNN) = 5.02 TeV with the ATLAS detector (2016)
  • Author(s): 1.M. Aaboud, M. Tomoto, Y. Horii, J. Maeda, O. Sasaki, S. Shimizu, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: The European Physical Journal C Volume: 76 Pages: 199-199
  • DOI: 10.1140/epjc/s10052-016-4002-3
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Study of hard double-parton scattering in four-jet events in pp collisions at sqrt(s)=7 TeV with the ATLAS experiment (2016)
  • Author(s): 1.M. Aaboud, M. Tomoto, Y. Horii, J. Maeda, O. Sasaki, S. Shimizu, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: Journal of High Energy Physics Volume: 2016 Pages: 110-110
  • DOI: 10.1007/jhep11(2016)110
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Measurement of event-shape observables in Z→l+l- events in pp collisions at sqrt(s)= 7 TeV with the ATLAS detector at the LHC (2016)
  • Author(s): 1.M. Aaboud, M. Tomoto, Y. Horii, J. Maeda, O. Sasaki, S. Shimizu, Y. Yamazaki et. al. [ATLAS Collaboration]
  • Journal Title: The European Physical Journal C Volume: 76 Pages: 375-375
  • DOI: 10.1140/epjc/s10052-016-4176-8
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] Development of the ATLAS muon trigger system on multi-threaded software framework (2019)
  • Author(s): 林田翔太
  • Organizer: The 4th KMI International Symposium (KMI 2019)
  • Int'l Joint Research
• [Presentation] Development of the muon tracking trigger based on Thin Gap Chamber for the ATLAS experiment at High-Luminosity LHC (2019)
  • Author(s): 麻田晴香
  • Organizer: The 4th KMI International Symposium (KMI 2019)
  • Int'l Joint Research
• [Presentation] Mitigation of the radiation effects on the readout electronics of the Thin Gap Chamber for the ATLAS experiment at HL-LHC (2019)
  • Author(s): 稲熊勇人
  • Organizer: The 4th KMI International Symposium (KMI 2019)
  • Int'l Joint Research
• [Presentation] Projection of inclusive Search for Gluinos and Squarks at the HL-LHC ATLAS experiment (2019)
  • Author(s): 脇田萌
  • Organizer: The 4th KMI International Symposium (KMI 2019)
  • Int'l Joint Research
• [Presentation] LHC-ATLAS実験Run-2におけるベクトルボゾン融合過程でのヒッグス対生成事象hh->4b事象の探索結果 (2019)
  • Author(s): 佐野祐太
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] LHC-ATLAS実験におけるH→μμ探索に向けたFSR事象に着目した不変質量分解能向上手法のZボソンデータを用いた検証 (2019)
  • Author(s): 川口智美
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] LHC-ATLAS実験Run-3に向けた新しいマルチスレッド対応ミューオントリガー系の性能評価 (2019)
  • Author(s): 林田翔太
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] 高輝度LHC-ATLAS実験のミューオン飛跡トリガーにおけるVirtex UltraScale+ FPGA利用法の研究 (2019)
  • Author(s): 麻田晴香
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] 高輝度LHC-ATLAS実験に向けたTGC検出器の前段読み出し回路の放射線対策 (2019)
  • Author(s): 稲熊勇人
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] LHC-ATLAS実験Run-3に向けた細分化カロリメータ情報を用いたレベル1タウ粒子トリガーの性能評価 (2019)
  • Author(s): 江角悠
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] Observation of ttH production at ATLAS (2019)
  • Author(s): 堀井泰之
  • Organizer: The 4th KMI International Symposium (KMI 2019)
  • Int'l Joint Research
• [Presentation] LHC-ATLAS 実験における低い横運動量ミューオンのトリガー効率の改善 (2019)
  • Author(s): 酒井 貴義
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] LHC-ATLAS実験におけるTGC検出器Run-2運転の総括 (2019)
  • Author(s): 川出健太郎
  • Organizer: 日本物理学会第74回年次大会
  • Invited
• [Presentation] The ATLAS Muon Trigger (2018)
  • Author(s): 林田翔太
  • Organizer: 23rd International Conference on Computing in High Energy and Nuclear Physics (CHEP 2018)
  • Int'l Joint Research
• [Presentation] LHC-ATLAS実験におけるベクトルボゾン融合過程でのヒッグス対生成事象hh→4bを用いた重いヒッグス粒子探索手法の確立 (2018)
  • Author(s): 佐野祐太
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] LHC-ATLAS実験のH→μμ探索における不変質量再構成手法の改善 (2018)
  • Author(s): 川口智美
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] 高輝度LHC-ATLAS実験に向けた TGC検出器の読み出し回路に搭載するASICの動作検証 (2018)
  • Author(s): 伊藤秀一
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] LHC-ATLAS実験Run-3に向けたマルチスレッディング技術のミューオントリガーメニューへの実装 (2018)
  • Author(s): 林田翔太
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] 高輝度LHC-ATLAS実験に向けたTGC検出器によるμ粒子飛跡トリガーの大規模FPGAへの実装 (2018)
  • Author(s): 麻田晴香
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] 高輝度LHC-ATLAS実験に向けたTGC検出器の前段読み出し回路の放射線対策手法の開発 (2018)
  • Author(s): 稲熊勇人
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] LHC-ATLAS実験Run-3に向けた細分化カロリメータ情報を用いたレベル1タウトリガーアルゴリズムの開発 (2018)
  • Author(s): 江角悠
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] 高輝度LHC-ATLAS実験のルミノシティ向上を見据えたTGC検出器によるμ粒子飛跡再構成トリガーアルゴリズムの開発 (2018)
  • Author(s): 若松一輝
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] 高輝度LHC-ATLAS実験におけるグルイーノとスクォークの探索感度推定 (2018)
  • Author(s): 脇田萌
  • Organizer: 日本物理学会2018年秋季大会
• [Presentation] Upgrade of the ATLAS Muon System for High-Luminosity LHC (2018)
  • Author(s): 堀井泰之
  • Organizer: XXXIX International Conference on High Energy Physics (ICHEP 2018)
  • Int'l Joint Research / Invited
• [Presentation] Observation of Higgs boson production in association with a ttbar pair (2018)
  • Author(s): 堀井泰之
  • Organizer: XXXIX International Conference on High Energy Physics (ICHEP 2018)
  • Int'l Joint Research / Invited
• [Presentation] HL-LHC計画に向けた検出器開発状況 (2018)
  • Author(s): 堀井泰之
  • Organizer: 日本物理学会2018年秋季大会
  • Invited
• [Presentation] Top-antitop charge asymmetry measurements in the dilepton channel with the ATLAS detector (2018)
  • Author(s): 木戸 将吾
  • Organizer: TOP 2018, 11th International Workshop on Top Quark Physics
  • Int'l Joint Research
• [Presentation] LHC-ATLAS実験Run-2におけるダイレプトン事象を用いたトップクォーク対電荷非対称度の測定 (2018)
  • Author(s): 木戸 将吾
  • Organizer: 日本物理学会 第74回年次大会
• [Presentation] Software-based data acquisition system for Level-1 end-cap muon trigger in ATLAS Run-3 (2018)
  • Author(s): 竹田 康亮
  • Organizer: CHEP 2018, 23rd International Conference on Computing in High Energy and Nuclear Physics, Sofia, Bulgaria
  • Int'l Joint Research
• [Presentation] LHC-ATLAS実験における高エネルギータウ粒子の再構成効率の改善 (2018)
  • Author(s): 竹田 康亮
  • Organizer: 日本物理学会第74回年次大会
• [Presentation] 素粒子物理学実験屋が今後測定したい物理量 (2018)
  • Author(s): 山崎祐司
  • Organizer: 日本物理学会2018年秋季大会
  • Invited
• [Presentation] 高輝度LHC-ATLAS実験に向けたTGC検出器の前段読み出し回路のシステム開発 (2018)
  • Author(s): 伊藤秀一
  • Organizer: 日本物理学会 第73回年次大会, 2018年3月23日, 東京理科大学野田キャンパス
• [Presentation] LHC-ATLAS実験Run-3に向けたマルチスレッディング実装フレームワークでのハイレベルミューオントリガー開発 (2018)
  • Author(s): 林田翔太
  • Organizer: 日本物理学会 第73回年次大会, 2018年3月23日, 東京理科大学野田キャンパス
• [Presentation] 高輝度LHC-ATLAS実験環境下におけるTGC検出器によるμ粒子飛跡トリガーレートの評価 (2018)
  • Author(s): 川口智美
  • Organizer: 日本物理学会 第73回年次大会, 2018年3月23日, 東京理科大学野田キャンパス
• [Presentation] LHC-ATLAS実験Run-2における2つのジェットと4bクォークの終状態を用いた重いヒッグス粒子の探索 (2018)
  • Author(s): 佐野祐太
  • Organizer: 日本物理学会 第73回年次大会, 2018年3月23日, 東京理科大学野田キャンパス
• [Presentation] LHC-ATLAS実験Run-3に向けたレベル１ミューオントリガーのpT閾値増設に伴う新たなpT閾値決定の研究 (2018)
  • Author(s): 吉田登志輝
  • Organizer: 日本物理学会 第73回年次大会, 2018年3月23日, 東京理科大学野田キャンパス
• [Presentation] Reconstruction techniques in supersymmetry searches in the ATLAS experiment (2017)
  • Author(s): 小野木宏太
  • Organizer: 25th International Conference on Supersymmetry and the Unification of Fundamental Interactions (SUSY 2017)
  • Int'l Joint Research / Invited
• [Presentation] 高輝度LHC-ATLAS実験に向けたTGC検出器によるμ粒子飛跡トリガーアルゴリズムの開発と性能評価 (2017)
  • Author(s): 川口智美
  • Organizer: 日本物理学会 2018 年秋季大会, 2017年9月12-15日,宇都宮大学 峰キャンパス
• [Presentation] Upgrade of the ATLAS Thin Gap Chambers Electronics for HL-LHC (2017)
  • Author(s): 川口智美
  • Organizer: International Conference on Technology and Instrumentation in Particle Physics (TIPP 2017)
  • Int'l Joint Research / Invited
• [Presentation] Upgrade of the ATLAS Thin Gap Chamber Electronics for HL-LHC (2017)
  • Author(s): 堀井泰之
  • Organizer: Topical Workshop on Electronics for Particle Physics 2017 (TWEPP 2017)
  • Int'l Joint Research / Invited
• [Presentation] Measurements of ttbar+X using the ATLAS detector (2017)
  • Author(s): 川出健太郎
  • Organizer: EPS-HEP 2017, European Conference on High Energy Physics, 2017年7月5-12日，ヴェニス，イタリア
  • Int'l Joint Research / Invited
• [Presentation] Searches for exotic resonances with top tagging (2017)
  • Author(s): 前田順平
  • Organizer: BOOST 2017, Embassy Suites Buffalo, NY, USA
  • Int'l Joint Research / Invited
• [Presentation] Determination of Top-Quark Properties (2017)
  • Author(s): 山崎祐司
  • Organizer: LP2017, The 28th International Symposium on Lepton Photon Interactions at High Energies, 2017年8月7-12日，中山大学，中国広州市
  • Int'l Joint Research / Invited
• [Presentation] Top quark production cross-section measurements (2017)
  • Author(s): 陳叶
  • Organizer: ICNFP2017 6th International Conference on New Frontiers in Physics, 2017年8月17-29日，Conference Center of the Orthodox Academy of Creta，ギリシャ
  • Int'l Joint Research / Invited
• [Presentation] LHC-ATLAS実験Run-3初段ミューオントリガーシステムのためのデータ収集システム統合試験 (2017)
  • Author(s): 竹田康亮
  • Organizer: 日本物理学会 2018 年秋季大会, 2017年9月12-15日,宇都宮大学 峰キャンパス
• [Presentation] LHC-ATLAS実験Run-2におけるダイレプトン終状態を用いたトップクォーク対荷電非対称の測定 (2017)
  • Author(s): 木戸将吾
  • Organizer: 日本物理学会 2018 年秋季大会, 2017年9月12-15日,宇都宮大学 峰キャンパス
• [Presentation] Review on the LHC Run2 results (2017)
  • Author(s): 中浜優
  • Organizer: The 3rd KMI International Symposium on "Quest for the Origin of Particles and the Universe" (KMI2017)
  • Int'l Joint Research / Invited
• [Presentation] Muon Trigger development toward High luminosity LHC (2017)
  • Author(s): 戸本誠
  • Organizer: The 3rd KMI International Symposium on "Quest for the Origin of Particles and the Universe" (KMI2017)
  • Int'l Joint Research / Invited
• [Presentation] Vacuum and spacetime with top physics (2017)
  • Author(s): 戸本誠
  • Organizer: Physics in LHC and the Early Universe
  • Int'l Joint Research / Invited
• [Presentation] LHC-ATLAS実験Run2における0レプトン終状態を用いたグルイーノの探索 (2) (2017)
  • Author(s): 佐野裕太
  • Organizer: 日本物理学会年次大会
• [Presentation] LHC-ATLAS実験Run2における1つの低運動量レプトンと複数ジェットを持つ終状態を用いたスカラートップクォーク対生成の探索 (2017)
  • Author(s): 小野木宏太
  • Organizer: 日本物理学会年次大会
• [Presentation] 高輝度LHC-ATLAS実験に向けたTGC検出器によるミューオントラックトリガー手法の開発 (2017)
  • Author(s): 川口智美
  • Organizer: 日本物理学会年次大会
• [Presentation] 高輝度LHC-ATLAS実験のエンドキャップミューオントリガーのための高速データ転送回路の動作検証 (2017)
  • Author(s): 宿谷琴子
  • Organizer: 日本物理学会年次大会
• [Presentation] ATLAS実験13TeV運転の纏めとヒッグスなどの測定結果 (2017)
  • Author(s): 川出健太郎
  • Organizer: 日本物理学会第72回年次大会
  • Invited
• [Presentation] ATLASミューオントリガー用のネットワークを用いたデータ収集システムのためのソフトウェア開発 (2017)
  • Author(s): 竹田康亮
  • Organizer: 第23回東京大学素粒子センターシンポジウム
• [Presentation] LHC-ATLAS実験Run3のためのレベル1ミューオントリガーにおけるDAQソフトウェアの開発 (2017)
  • Author(s): 谷岡凌
  • Organizer: 第23回東京大学素粒子センターシンポジウム
• [Presentation] ATLAS実験のミューオン検出器でのフェイクヒットの研究 (2017)
  • Author(s): 若宮光太郎
  • Organizer: 第23回東京大学素粒子センターシンポジウム
• [Presentation] LHC-ATLAS実験sqrt(s)=13TeVにおけるハドロン崩壊を用いたトップクォーク対生成微分断面積の測定 (2017)
  • Author(s): 陳叶
  • Organizer: 日本物理学会2017年春季大会
• [Presentation] LHC-ATLASミューオントリガーにおけるプロセス間通信を用いたデータ収集システムのためのソフトウェア開発 (2017)
  • Author(s): 竹田康亮
  • Organizer: 日本物理学会2017年春季大会
• [Presentation] LHC-ATLAS実験におけるミューオン検出器でのフェイクヒットの成因研究 (2017)
  • Author(s): 若宮光太郎
  • Organizer: 日本物理学会2017年春季大会
• [Presentation] ATLAS/CMS Upgrades (2016)
  • Author(s): 堀井泰之
  • Organizer: Heavy Quarks and Leptons 2016
  • Int'l Joint Research / Invited
• [Presentation] Review of Top Quark Production at LHC and Tevatron (2016)
  • Author(s): 川出健太郎
  • Organizer: Heavy Quarks and Leptons 2016
  • Int'l Joint Research / Invited
• [Presentation] ATLAS Muon Trigger and Readout Considerations (2016)
  • Author(s): 堀井泰之
  • Organizer: ECFA High Luminosity LHC Experiments Workshop 2016
  • Int'l Joint Research / Invited
• [Presentation] Test of QCD at Colliders (2016)
  • Author(s): 清水志真
  • Organizer: Blois 2016 for Particle Physics and Cosmology
  • Int'l Joint Research / Invited
• [Presentation] Activities of Kobe University Particle Physics Group, ATLAS (2016)
  • Author(s): 藏重久弥
  • Organizer: Kick Off Symposium for Honolulu Office of Kobe University
  • Int'l Joint Research / Invited
• [Presentation] Selected results related to forward physics from the ATLAS experiment (2016)
  • Author(s): 山﨑祐司
  • Organizer: France-Japan SAKURA Workshop on small-x physics at the LHC
  • Int'l Joint Research / Invited
• [Presentation] Exotic physics searches in the ATLAS experiment (2016)
  • Author(s): 前田順平
  • Organizer: The 7th Kobe University Brussels European Centre Symposium
  • Int'l Joint Research / Invited
• [Presentation] LHC-ATLAS (2016)
  • Author(s): 山﨑祐司
  • Organizer: Flavor Physics Workshop 2016
  • Invited
• [Presentation] Recent measurements of top-quark pair differential cross-sections at sqrt(s) = 7, 8, and 13,TeV with the LHC-ATLAS experiment (2016)
  • Author(s): 川出健太郎
  • Organizer: The 3rd International Symposium on “Quest for the Origin of Particles and the Universe” (KMI2017)
  • Int'l Joint Research / Invited
• [Presentation] LHC-ATLAS実験Run-2における1レプトンと複数ジェットを持つ終状態を用いたスカラートップクォーク対生成の探索 (2016)
  • Author(s): 小野木宏太
  • Organizer: 日本物理学会秋季大会
• [Presentation] 高エネルギー素粒子実験におけるフラッシュベースIGLOO2FPGAの利用に向けた放射線耐性試験 (2016)
  • Author(s): 佐野祐太
  • Organizer: 日本物理学会秋季大会
• [Presentation] 高輝度LHC-ATLAS実験に向けたMDT検出器のフロントエンド回路開発 (2016)
  • Author(s): 水越健太
  • Organizer: 日本物理学会秋季大会
• [Presentation] 高輝度LHC-ATLAS実験に向けたエンドキャップミューオントリガーのための高速データ転送回路の開発 (2016)
  • Author(s): 宿谷琴子
  • Organizer: 日本物理学会秋季大会
• [Presentation] Application of flash-based field-programmable gate arrays in high energy experiments (2016)
  • Author(s): 佐野祐太
  • Organizer: Topical Workshop on Electronics for Particle Physics (TWEPP2016)
  • Int'l Joint Research / Invited
• [Presentation] 宇宙線を用いたMicroMEGASの位置分解能の抵抗膜構造による依存性の測定 (2016)
  • Author(s): 斉藤大起
  • Organizer: 日本物理学会2016年秋季大会