Teppei Kitahara, Takahiro Yoshinaga
ATLAS and CMS collaborations have presented results of excess of the Higgs to diphoton decay channel. In the Minimal Supersymmetric Standard Model (MSSM), this situation can be achieved by a light stau and a large left-right mixing of the staus. However, this parameter region is severely constrained by vacuum stability. In order to relax the vacuum stability, we focus on the parameter region where the mass difference between two staus is large. This region was not considered in the literature. In this paper, we show that the stau with large mass difference can relax the vacuum stability sufficiently even if lighter stau mass is kept light. We find that when the mass difference of two staus is large, the enhancement of the Higgs to diphoton decay rate becomes small in spite of relaxation of the vacuum stability. Because of this feature, O(70)% enhancement of the Higgs to diphoton decay rate is difficult at light stau scenario in the MSSM.
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http://arxiv.org/abs/1303.0461
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