Cosmological tests of charged supersymmetric particles

2014 Fiscal Year Final Research Report

• Project/Area Number: 23540327
• 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: KOHRI Kazunori 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, 准教授 (50565819)
• Project Period (FY): 2011-04-28 – 2015-03-31
• Keywords: 宇宙論 / ダークマタ― / 超対称性粒子

Outline of Final Research Achievements

During the period in which I have been supported by this grant, I have published 34 papers including a single concluding full-length paper. In response to the discovery of the Higgs particle in 2013, the parameter spaces of Minimal Supersymmetric Standard Models (MSSM) have been restricted severely. In order to fit the data of the relic
abundance of the cold dark matter which could be a particle in MSSM, and satisfy the conditions for the successful big-bang nucleosynthesis, the allowed parameter spaces have been severely shrunk or disappeared. However, we have shown that if we add a new singlet particle (singlino) into the MSSM model, the situation is changed. The singlino can become the cold dark matter, and the existence of the long-lived scalar tau lepton can solve both the Lithium 7 and Lithium 6 problems simultaneously in some parameter
spaces. By those achievements, we have summarized all of known important effects on cosmology induced by a long-lived charged massive particle.

Free Research Field

素粒子的宇宙論