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

2017 Fiscal Year Final Research Report

• 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
• Keywords: 素粒子(実験) / K 中間子 / ミュー粒子電子普遍性

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.

Free Research Field

素粒子実験