Abstract
Non-minimal supersymmetric models that predict a tree-level Higgs mass above the Minimal Supersymmetric Standard Model (MSSM) bound are well motivated by naturalness considerations. Indirect constraints on the stop sector parameters of such models are significantly relaxed compared to the MSSM; in particular, both stops can have weak-scale masses. We revisit the stop-catalyzed electroweak baryogenesis (EWB) scenario in this context. We find that the LHC measurements of the Higgs boson production and decay rates already rule out the possibility of stop-catalyzed EWB. We also introduce a gauge-invariant analysis framework that may generalize to other scenarios in which interactions outside the gauge sector drive the electroweak phase transition.
Highlights
The origin of matter-antimatter asymmetry in the Universe is a longstanding problem at the interface of particle and nuclear physics with cosmology
One of the most interesting possibilities, which has attracted much attention in recent years, is the electroweak baryogenesis (EWB) scenario, where the baryon asymmetry is produced during the electroweak phase transition (EWPT)
We focus on the possibility that low-mass stops may give rise to the first order EWPT, the so-called stop-catalyzed electroweak baryogenesis scenario
Summary
The origin of matter-antimatter asymmetry in the Universe is a longstanding problem at the interface of particle and nuclear physics with cosmology. The basic idea is that a very light stop (m ≈ 100 GeV) modifies the Higgs potential at finite temperatures via quantum loop effects, inducing a barrier along the Higgs direction between the electroweak symmetric and broken vacua and triggering a strongly 1st-order EWPT It has been already shown in [20,21] that this scenario is no longer viable in the context of minimal supersymmetric standard model (MSSM), in light of the LHC measurements of the Higgs boson mass, production cross sections and decay rates (for pre-LHC works on the same subject see [22]).
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