Search for New Physics Beyond the Standard Model with Rare Neutral Kaon Decays

2015 Fiscal Year Final Research Report

• Project/Area Number: 23224007
• Research Category: Grant-in-Aid for Scientific Research (S)
• Allocation Type: Single-year Grants
• Research Field: Particle/Nuclear/Cosmic ray/Astro physics
• Research Institution: Osaka University
• Principal Investigator: YAMANAKA TAKU 大阪大学, 理学(系)研究科(研究院), 教授 (20243157)
• Co-Investigator(Kenkyū-buntansha): KOMATSUBARA Takeshi 高エネルギー加速器研究機構, 素粒子原子核研究所, 教授 (30242168) ; NANJO Hajime 京都大学, 理学研究科, 助教 (40419445) ; TAJIMA Yasuhisa 山形大学, 学内共同利用施設等, 准教授 (50311577) ; MATSUMURA Toru 防衛大学校, 応用科学群, 講師 (00545957) ; SUZUKI Shiro 佐賀大学, 工学研究科, その他 (50089851)
• Co-Investigator(Renkei-kenkyūsha): LIM GeiYoub 高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (90332113) ; NOMURA Tadashi 高エネルギー加速器研究機構, 素粒子原子核研究所, 准教授 (10283582)
• Project Period (FY): 2011-04-01 – 2016-03-31
• Keywords: 素粒子実験 / K中間子 / CP対称性の破れ / 標準理論を超える物理

Outline of Final Research Achievements

To search for new physics beyond the standard model, that breaks the CP symmetry, we will search for a rare KL decay mode using the J-PARC high intensity proton accelerator. We developed various new detectors for the new experiment, and started taking data. We showed that the new experiment has 2 orders of magnitude higher sensitivity than the previous experiment. We also found a new type of background events, and developed various techniques to suppress it. We plan to reach the original goal by collecting data with an increasing beam power, despite a 3 years of delay caused by the earthquake and a radiation accident.

Free Research Field

素粒子実験