Abstract
We investigate the implications of the Higgs rate measurements from Run 1 of the LHC for the mass of the light scalar top partner (stop) in the Minimal Supersymmetric Standard Model (MSSM). We focus on light stop masses, and we decouple the second, heavy stop and the gluino to the multi-TeV range in order to obtain a Higgs mass of around 125 GeV. We derive lower mass limits for the light stop within various scenarios, taking into account the effects of a possibly light scalar tau partner (stau) or chargino on the Higgs rates, of additional Higgs decays to undetectable new physics, as well as of non-decoupling of the heavy Higgs sector. Under conservative assumptions, the stop can be as light as 123 GeV. Relaxing certain theoretical and experimental constraints, such as vacuum stability and model-dependent bounds on sparticle masses from LEP, we find that the light stop mass can be as light as 116 GeV. Our indirect limits are complementary to direct limits on the light stop mass from collider searches and have important implications for electroweak baryogenesis in the MSSM as a possible explanation for the observed matter-antimatter asymmetry of the Universe.
Highlights
While electroweak baryogenesis demands ingredients beyond the particle content of the Standard Model (SM) [1], it is simple enough to construct working examples for such a scenario in the context of well-motivated extensions of the SM, such as the minimal supersymmetric extension to the Standard Model (MSSM)
We investigate the implications of the Higgs rate measurements from Run 1 of the Large Hadron Collider (LHC) for the mass of the light scalar top partner in the Minimal Supersymmetric Standard Model (MSSM)
In this study we derived indirect limits on the light stop mass in the MSSM from the Higgs rate measurements performed at Run 1 of the LHC
Summary
While electroweak baryogenesis demands ingredients beyond the particle content of the Standard Model (SM) [1], it is simple enough to construct working examples for such a scenario in the context of well-motivated extensions of the SM, such as the minimal supersymmetric extension to the Standard Model (MSSM). Potential admixtures of light stop decay modes with and without intermediate charginos may further weaken the current exclusion limits We conclude that these searches highly depend on the assumed decay mode(s) of the stop and on the mass spectrum of the involved supersymmetric particles. [49, 50]), ruling out, at face value, the possibility of successful EWBG in the MSSM Under these circumstances, light stop masses of ∼ 200 GeV are viable only for a large stop mixing parameter, which would suppress the coupling of the light stop to the light Higgs and prevent it from having a significant effect on the electroweak phase transition [11, 51]. In order to allow for light stop masses below the top mass which exhibit a substantial influence on the strength of the electroweak phase transition, a large mass splitting in the stop sector with a multi-TeV heavy stop and a small to moderate stop mixing parameter is needed.
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