Vacuum stability in stau-neutralino coannihilation in MSSM

doi:10.1016/j.physletb.2018.12.001

CORC > 理论物理研究所 > 中国科学院理论物理研究所 > 理论物理所科研产出 > 理论物理所1978-2010年知识产出

	Vacuum stability in stau-neutralino coannihilation in MSSM
	Duan, GH ; Han, CC ; Peng, B 6; Wu, L 2,3; Yang, JM
刊名	PHYSICS LETTERS B
	2019
卷号	788 页码:475-479
关键词	MINIMAL SUPERGRAVITY RELIC DENSITY CONSTRAINTS MASS POTENTIALS PROGRAM CHARGE LIGHT
ISSN号	0370-2693
DOI	10.1016/j.physletb.2018.12.001
英文摘要	The stau-neutralino coannihilation provides a feasible way to accommodate the observed cosmological dark matter (DM) relic density in the minimal supersymmetric standard model (MSSM). In such a coannihilation mechanism the stau mass usually has an upper bound since its annihilation rate becomes small with the increase of DM mass. Inspired by this observation, we examine the upper limit of stau mass in the parameter space with a large mixing of staus. We find that the stau pair may dominantly annihilate into dibosons and hence the upper bound on the stau mass (similar to 400 GeV) obtained from the f (f) over bar final states can be relaxed. Imposing the DM relic density constraint and requiring a long lifetime of the present vacuum, we find that the lighter stau mass can be as heavy as about 1.4 TeV for the stau maximum mixing. However, if requiring the present vacuum to survive during the thermal history of the universe, this mass limit will reduce to about 0.9 TeV. We also discuss the complementarity of vacuum stability and direct detections in probing this stau coannihilation scenario. (C) 2018 The Author(s). Published by Elsevier B.V.
学科主题	Astronomy & Astrophysics ; Physics
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/23511]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China 2.Univ Tokyo, UTIAS, Kavli IPMU WPI, Kashiwa, Chiba 2778583, Japan 3.Nanjing Normal Univ, Dept Phys, Nanjing 210023, Jiangsu, Peoples R China 4.Nanjing Normal Univ, Inst Theoret Phys, Nanjing 210023, Jiangsu, Peoples R China 5.Tohoku Univ, Dept Phys, Sendai, Miyagi 9808578, Japan 6.Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Duan, GH,Han, CC,Peng, B,et al. Vacuum stability in stau-neutralino coannihilation in MSSM[J]. PHYSICS LETTERS B,2019,788:475-479.
APA	Duan, GH,Han, CC,Peng, B,Wu, L,&Yang, JM.(2019).Vacuum stability in stau-neutralino coannihilation in MSSM.PHYSICS LETTERS B,788,475-479.
MLA	Duan, GH,et al."Vacuum stability in stau-neutralino coannihilation in MSSM".PHYSICS LETTERS B 788(2019):475-479.