Stop-Catalyzed Baryogenesis Beyond the MSSM

TL;DR

This paper examines the viability of stop-catalyzed electroweak baryogenesis in non-minimal supersymmetric models, concluding that current LHC data rules out this scenario, and introduces a gauge-invariant analysis framework.

Contribution

It provides a comprehensive analysis of stop-catalyzed baryogenesis beyond the MSSM and proposes a new gauge-invariant framework for studying electroweak phase transitions.

Findings

LHC Higgs data rules out stop-catalyzed EWB in these models.

Non-minimal SUSY models allow weak-scale stops due to relaxed constraints.

The paper introduces a gauge-invariant analysis method for phase transition studies.

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.