Precise estimate of charged Wino decay rate

Journal of High Energy Physics

Regular Article - Theoretical Physics

Masataka Mishima¹  Yuhei Nakayama¹  Masahiro Ibe²  Satoshi Shirai³ 

[1] ICRR, The University of Tokyo, 277-8582, Kashiwa, Chiba, Japan;ICRR, The University of Tokyo, 277-8582, Kashiwa, Chiba, Japan;Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, 277-8583, Kashiwa, Japan;Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, 277-8583, Kashiwa, Japan;

关键词: Higher Order Electroweak Calculations;    Dark Matter at Colliders;    Supersymmetry;   

DOI  :  10.1007/JHEP01(2023)017

 received in 2022-11-09, accepted in 2022-12-18,  发布年份 2022

来源: Springer

【 摘 要 】

The Wino is an SU(2)L triplet Majorana fermion and a well-motivated dark matter candidate. The mass difference between the charged and the neutral Winos is small thanks to the SU(2)L symmetry. The small mass difference makes the charged Wino metastable, which provides disappearing charged track signatures at collider experiments. The constraint on the Wino dark matter at the LHC strongly depends on the Wino lifetime. We compute the next-to-leading order (NLO) correction of the charged Wino decay and make the most precise estimate of the decay rate. We find that the NLO decay rate is determined by the mass difference and scarcely depend on the Wino mass itself in the heavy Wino limit. As a result, we find the NLO correction gives a minor impact on the lifetime of 2–4% increase.

【 授权许可】

Unknown   
© The Author(s) 2023

【 图 表 】

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