九州大学 研究者情報
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基本情報 研究活動 教育活動
山中 隆志(やまなか たかし) データ更新日:2020.04.06



主な研究テーマ
シリコンストリップ検出器を用いたミューオン異常磁気モーメントおよび電気双極子モーメントの測定
キーワード:ミューオン, 異常磁気モーメント, 電気双極子モーメント, シリコンストリップ検出器
2017.05.
従事しているプロジェクト研究
J-PARC muon g-2/EDM experiment (E34)
2017.05~2020.03, 代表者:三部勉, 高エネルギー加速器研究機構 素粒子原子核研究所, 高エネルギー加速器研究機構.
研究業績
主要原著論文
1. ATLAS Collaboration, Search for squarks and gluinos in final states with jets and missing transverse momentum using 36 fb^-1 of √s = 13 TeV pp collision data with the ATLAS detector, PHYSICAL REVIEW D, 10.1103/PhysRevD.97.112001, 97, 112001, 2018.06, A search for the supersymmetric partners of quarks and gluons (squarks and gluinos) in final states containing hadronic jets and missing transverse momentum, but no electrons or muons, is presented. The data used in this search were recorded in 2015 and 2016 by the ATLAS experiment in √s=13 TeV proton-proton collisions at the Large Hadron Collider, corresponding to an integrated luminosity of 36.1 fb^−1. The results are interpreted in the context of various models where squarks and gluinos are pair
produced and the neutralino is the lightest supersymmetric particle. An exclusion limit at the 95% confidence level on the mass of the gluino is set at 2.03 TeV for a simplified model incorporating only a gluino and the lightest neutralino, assuming the lightest neutralino is massless. For a simplified model involving the strong production of mass-degenerate first- and second-generation squarks, squark masses below 1.55 TeV are excluded if the lightest neutralino is massless. These limits substantially extend the region of supersymmetric parameter space previously excluded by searches with the ATLAS detector..
2. M. Abe, S. Bae, G. Beer, G. Bunce, H. Choi, S. Choi, M. Chung, W. da Silva, S. Eidelman, M. Finger,Y. Fukao, T. Fukuyama, S. Haciomeroglu, K. Hasegawa, K. Hayasaka, N. Hayashizaki, H. Hisamatsu, T. Iijima, H. Iinuma, H. Ikeda, M. Ikeno, K. Inami, K. Ishida, T. Itahashi, M. Iwasaki, Y. Iwashita, Y. Iwata, R. Kadono, S. Kamal, T. Kamitani, S. Kanda, F. Kapusta, K. Kawagoe, N. Kawamura, B. Kim, Y. Kim, T. Kishishita, R. Kitamura, H. Ko, T. Kohriki, Y. Kondo, T. Kume, M. J. Lee, S. Lee, W. Lee, G. M. Marshall, Y. Matsuda, T. Mibe, Y. Miyake, T. Murakami, K. Nagamine, H. Nakayama, S. Nishimura1, D. Nomura1,T. Ogitsu1, S. Ohsawa,K. Oide1,Y. Oishi, S. Okada,A. Olin, Z. Omarov, M. Otani, G. Razuvaev, A. Rehman, N. Saito, N. F. Saito, K. Sasaki, O. Sasaki, N. Sato, Y. Sato, Y. K. Semertzidis, H. Sendai, Y. Shatunov, K. Shimomura, M. Shoji, B. Shwartz, P. Strasser1, Y. Sue, T. Suehara, C. Sung, K. Suzuki, T.Takatomi, M.Tanaka, J.Tojo,Y. Tsutsumi,T. Uchida,K. Ueno, S.Wada, E.Won, H.Yamaguchi, T.Yamanaka, A.Yamamoto, T.Yamazaki, H.Yasuda,M.Yoshida, and T.Yoshioka, A new approach for measuring the muon anomalous magnetic moment and electric dipole moment, Progress of Theoretical and Experimental Physics, 10.1093/ptep/ptz030, 2019, 5, 053C02, 2019.05, This paper introduces a new approach to measure the muon magnetic moment anomaly aμ = (g − 2)/2 and the muon electric dipole moment (EDM) dμ at the J-PARC muon facility. The goal of our experiment is to measure aμ and dμ using an independent method with a factor of 10 lower muon momentum, and a factor of 20 smaller diameter storage-ring solenoid compared with previous and ongoing muon g − 2 experiments with unprecedented quality of the storage magnetic field. Additional significant differences from the present experimental method include a factor of 1000 smaller transverse emittance of the muon beam (reaccelerated thermal muon beam), its efficient vertical injection into the solenoid, and tracking each decay positron from muon decay to obtain its momentum vector. The precision goal for aμ is a statistical uncertainty
of 450 parts per billion (ppb), similar to the present experimental uncertainty, and a systematic uncertainty less than 70 ppb. The goal for EDM is a sensitivity of 1.5 × 10^−21 e · cm..
3. ATLAS Collaboration, Search for squarks and gluinos in final states with jets and missing transverse momentum at √s=13 TeV with the ATLAS detector, The European Physical Journal C, 10.1140/epjc/s10052-016-4184-8, 76, 392, 2016.06, [URL], A search for squarks and gluinos in final states containing hadronic jets, missing transverse momentum but no electrons or muons is presented. The data were recorded in 2015 by the ATLAS experiment in √s= 13 TeV proton--proton collisions at the Large Hadron Collider. No excess above the Standard Model background expectation was observed in 3.2 fb^−1 of analyzed data. Results are interpreted within simplified models that assume R-parity is conserved and the neutralino is the lightest supersymmetric particle. An exclusion limit at the 95% confidence level on the mass of the gluino is set at 1.51 TeV for a simplified model incorporating only a gluino octet and the lightest neutralino, assuming the lightest neutralino is massless. For a simplified model involving the strong production of mass-degenerate first- and second-generation squarks, squark masses below 1.03 TeV are excluded for a massless lightest neutralino. These limits substantially extend the region of supersymmetric parameter space excluded by previous measurements with the ATLAS detector..
主要学会発表等
1. Takashi Yamanaka for the J-PARC E34 Collaboration, Muon g-2/EDM Experiment at J-PARC, 2019 KPS Spring Meeting, 2019.04, A new precise muon g-2/EDM measurement is planned at J-PARC. The recent experiment at BNL measured muon g-2 at 0.54 ppm but there is a discrepancy from the Standard Model expectation by more than three standard deviations. The experiment at J-PARC aims to measure muon g-2 with a different method from BNL or another experiment ongoing at FNAL and also to improve a sensitivity to muon EDM. We use a novel technique of muon beam thermalization, accelerate muons to 300 MeV/c, inject and store them in high precision MRI-type magnet with the storage orbit diameter of 66 cm and 3 T field and focuses with weak magnetic field. Positron tracks from muon decays are reconstructed by the silicon strip detector. By using different approaches from BNL and FNAL, J-PARC experiment will provide a independent measurement. The overall design and its preparation status will be presented..
2. T. Yamanaka, T. Aoyagi, H. Ikeda, M. Ikeno, T. Ito, K. Ueno, T. Uchida, K. Kawagoe, T. Kishishita, T. Kume, T. Kohriki, N. Saito, O. Sasaki, T. Sata, N. Sato, Y. Sato, M. Shoji, S. Shirabe, T. Suehara, Y. Sue, T. Suda, H. Sendai, T. Takatomi, M. Tanaka, K. Tsukada, Y. Tsutsumi, J. Tojo, K. Namba, S. Nishimura, Y. Honda, M. Matama, T. Mibe, T. Murakami, H. Yasuda, T. Yoshioka, and J-PARC muon g-2/EDM Collaboration, Positron Tracking Detector for J-PARC Muon g-2/EDM Experiment, 15th Vienna Conference on Instrumentation, 2019.02.
3. Takashi Yamanaka, Muon g-2/EDM measurement at J-PARC, 10th International Workshop on Fundamental Phisics Using Atoms, 2018.01, [URL], A new precise muon g-2/EDM measurement is planned at J-PARC. The recent experiment at BNL
measured muon g-2 at 0.5 ppm but there is a discrepancy from the standard model expectation by
three standard deviation. The experiment at J-PARC uses a novel technique of ultra-cold muon beam,
accelerates muons to 300 MeV/c, injects and stores them in ultra-high precision MRI-type magnet with 66 cm diameter and 3 T field and focuses with weak magnetic field. Positron tracks from muon decays are reconstructed by the silicon strip detector. By using different approaches from BNL and another experiment ongoing at FNL, J-PARC experiment will provide a independent measurement. The overall design and its preparation status will be reported..
学会活動
所属学会名
日本物理学会

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pure2017年10月2日から、「九州大学研究者情報」を補完するデータベースとして、Elsevier社の「Pure」による研究業績の公開を開始しました。
 
 
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