Analysis and calibratioin of a search for lepton flaver universality violation using stopped positive kaons

• Project/Area Number: 15K05113
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: High Energy Accelerator Research Organization
• Principal Investigator: IGARASHI Youichi 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, 研究機関講師 (50311121)
• Co-Investigator(Kenkyū-buntansha): 清水 俊 大阪大学, 理学研究科, 助教 (60294146)
• Research Collaborator: IMAZATO Jun 高エネルギー加速器研究機構, 素粒子原子核研究所, 名誉教授 ; YAMAZAKI Hirohito 高エネルギー加速器研究機構, 放射線科学センター, 准教授 (40107686) ; HORIE Keito 大阪大学, 理学研究科, 技術職員 (80432467) ; ITO Hiroshi 神戸大学, 大学院理学研究科, 研究員 (60814720)
• Project Period (FY): 2015-04-01 – 2018-03-31
• Project Status: Completed (Fiscal Year 2017)
• Budget Amount: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000); Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000); Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000); Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
• Keywords: 素粒子(実験) / K 中間子 / ミュー粒子電子普遍性 / 素粒子実験

Outline of Final Research Achievements

Electron and Muon have the same behavior without their mass on the standard model.This is known as Lepton Flavor Universality (LFU).
The experiment searches the new physics by a search of the violation of LFU using the charged Kaon decay.The ratio of the branching ratio of K→μν and K→eν was measured precisely using the J-PARC high intensity beam by the experiment.
This research calibrated the detectors and developed a calculation method of the energy and an algorithm of the particle identification. And also a detector Monte Carlo simulation program was developed to understand the detector system. From these, the research succeeded a counting of the target decay modes, a screening and an understanding of a background decay mode which is the structure dependent radiative decay.

Research Products

• [Int'l Joint Research] Hampton University/Jefferson Laboratory/Iowa State University(米国)
• [Int'l Joint Research] University of British Columbia/TRIUMF(Canada)
• [Int'l Joint Research] INR(ロシア連邦)
• [Int'l Joint Research] Hampton University/Jefferson Laboratory/Iowa State University(米国)
• [Int'l Joint Research] University of British Columbia/TRIUMF(Canada)
• [Int'l Joint Research] INR(ロシア連邦)
• [Journal Article] Improved search for heavy neutrinos in the decay π→eν (2018)
  • Author(s): PIENU Collaboration
  • Journal Title: PHYSICAL REVIEW D Volume: 97 Issue: 7 Pages: 072012-072012
  • DOI: 10.1103/physrevd.97.072012
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Precision Measurement of the $\pi$$^+$$\rightarrow$$e^+$$\nu$$_e$ Branching Ratio in the PIENU Experiment (2017)
  • Author(s): Ito Shintaro、Aguilar-Arevalo A、Aoki M.、Blecher M.、I. Britton D、A. Bryman D、vom Bruch D、Chen S.、Comfort J.、Cuen-Rochin S、Doria L.、Gumplinger P.、Husseina A.、Igarashi Y.、Kettell. S.、Kurchaninov L.、Littenberg L.、Malbrunot C.、E. Mischke R、Numao T.、Protopopescu D.、Sher A.、Sullivan T.、Vavilov D.
  • Journal Title: Proc. of Science, The 3rd International Symposium on “Quest for the Origin of Particles and the Universe" (KMI2017) Volume: 294 Pages: 034-034
  • DOI: 10.22323/1.294.0034
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Initial results from the PIENU experiment (2017)
  • Author(s): T. Sullivan, A. Aguilar-Arevalo, M. Aoki, M. Blecher, D.I Britton, D.A Bryman, D. vom Bruch, S. Chen, J. Comfort, S. Cuen-Rochin, L. Doria, P. Gumplinger, A. Hussein, Y. Igarashi, S. Ito, S.H Kettell, L. Kurchaninov, L.S Littenberg, C. Malbrunot, R.E Mischke, T. Numao, D. Protopopescu, A. Sher, D. Vavilov
  • Journal Title: Hyperfine Interact Proceedings Volume: 238 no. 1, 3 Issue: 1 Pages: 3-3
  • DOI: 10.1007/s10751-016-1367-5
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Search for massive neutrinos in π+→e+νeπ+→e+νe decay (2017)
  • Author(s): S. Ito, A. Aguilar-Arevalo, M. Aoki, M. Blecher, D.I. Britton, D.A. Bryman, D.vom Bruch, S. Chen , J. Comfort, S. Cuen-Rochin, L. Doria, P. Gumplinger, A. Hussein, Y. Igarashi, S. Kettell, L. Kurchaninov, L. Littenberg, C. Malbrunot, R.E. Mischke, T. Numao, D. Protopopescu, A. Sher, T. Sullivan, D. Vavilov
  • Journal Title: Hyperfine Interact Proceedings Volume: 238 no 1, 3 Issue: 1 Pages: 1-1
  • DOI: 10.1007/s10751-016-1375-5
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] The design and basic performance of a Spiral Fiber Tracker for the J-PARC E36 experiment (2017)
  • Author(s): O. Mineev, S. Bianchin, M.D. Hasinoff, K. Horie, Y. Igarashi, J. Imazato, H. Ito, H. Kawai, S. Kodama, M. Kohl, Yu. Kudenko, S. Shimizu, M. Tabata, A. Toyoda, N. Yershov
  • Journal Title: Nuclear Instruments and Methods in Physics Research Section A Volume: 847 Pages: 136-141
  • DOI: 10.1016/j.nima.2016.11.057
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Data acquisition system for the J-PARC E36 experiment (2016)
  • Author(s): Y. Igarashi, H. Lu, R. Tanuma
  • Journal Title: 20th IEEE-NPSS Real Time Conference Proceedings Volume: - Pages: 1-4
  • DOI: 10.1109/rtc.2016.7543154
  • Open Access / Int'l Joint Research / Acknowledgement Compliant
• [Journal Article] Fabrication of silica aerogel with n = 1.08 for e+/μ+ separation in a threshold Cherenkov counter of the J-PARC TREK/E36 experiment (2015)
  • Author(s): M. Tabata, A. Toyoda, H. Kawai, Y. Igarashi, J. Imazato, S. Shimizu, H. Yamazaki
  • Journal Title: Nuclear Instruments and Methods in Physics Research A Volume: 795 Pages: 206-212
  • DOI: 10.1016/j.nima.2015.06.002
  • Peer Reviewed / Int'l Joint Research
• [Presentation] J-PARC E36実験Γ(K+→e+ν)/Γ(K+→μ+ν)測定によるレプトン普遍性破れ探索実験の解析進捗(1) (2018)
  • Author(s): 清水俊, 五十嵐洋一, 伊藤博士, 今里純, 木村翔太, 小林篤史, 堀江圭都
  • Organizer: 日本物理学会 2018年第73回年次大会
• [Presentation] J-PARC E36実験Γ(K+→e+ν)/Γ(K+→μ+ν)測定によるレプトン普遍性破れ探索実験の解析進捗(1) (2018)
  • Author(s): 堀江圭都, 清水俊, 伊藤博士, , 今里純, 五十嵐洋一, 木村翔太, 小林篤史 for the J-PARC E36 collaboration
  • Organizer: 日本物理学会 2018年第73回年次大会
• [Presentation] Γ(K+→ e+ν) / Γ(K+→ μ+ν) 測定によるレプトン普遍性破れ探索実験の解析(2) (2017)
  • Author(s): 堀江圭都 for the E36 TREK collaboration (清水俊, 五十嵐 洋一, 他)
  • Organizer: 日本物理学会 第72回年次大会
  • Place of Presentation: 大阪大学 豊中キャンパス (大阪府・豊中市)
  • Year and Date: 2017-03-17
• [Presentation] J-PARC E36実験：Γ(K+ -> e+ ν)/Γ(K+ -> μ+ ν)測定によるレプトン普遍性破れ探索実験のガンマ線測定最適化の研究 (2017)
  • Author(s): 伊藤博士, 堀江圭都, 五十嵐洋一, 今里純, 河合秀幸, 児玉諭士, 清水俊
  • Organizer: 日本物理学会 第72回年次大会
  • Place of Presentation: 大阪大学 豊中キャンパス (大阪府・豊中市)
  • Year and Date: 2017-03-17
• [Presentation] J-PARC,E36実験Γ(K+->e+ ν)/Γ(K+->μ+ ν)測定によるレプトン普遍性破れ探索実験の解析(2) (2017)
  • Author(s): 堀江圭都 for the TREK collaboration (清水 俊、五十嵐 洋一、他)
  • Organizer: 日本物理学会 2017年第72回年次大会
• [Presentation] J-PARC E36実験：Γ(K+ -> e+ ν)/Γ(K+ -> μ+ ν)測定によるレプトン普遍性破れ探索実験のガンマ線測定最適化の研究 (2017)
  • Author(s): 伊藤博士, 堀江圭都, 河合秀幸, 清水俊
  • Organizer: 日本物理学会 2017年第72回年次大会
• [Presentation] Data acquisition system for the J-PARC E36 experiment (2016)
  • Author(s): Y. Igarashi
  • Organizer: 20th IEEE-NPSS Real Time Conference
  • Place of Presentation: パドヴァ (イタリア)
  • Year and Date: 2016-07-05
  • Int'l Joint Research
• [Remarks] The J-PARC TREK Colaboration
  • URL: http://trek.kek.jp
• [Remarks] The J-PARC TREK Collaboration
  • URL: http://trek.kek.jp/
• [Remarks] J-PARC Experiment E36
  • URL: http://trek.kek.jp/e36/index.html