Charge-breaking constraints on left-right mixing of stau's

TL;DR

This paper investigates how large left-right mixing of staus in the minimal supersymmetric standard model affects vacuum stability, deriving constraints on model parameters using semiclassical techniques and applying them to gauge mediation models.

Contribution

It provides a detailed calculation of vacuum transition rates with a multifield bounce solution to constrain stau mixing parameters.

Findings

Large left-right stau mixing can destabilize the electroweak vacuum.

Constraints on model parameters are derived from vacuum metastability considerations.

Results are applied to low-energy gauge mediation models.

Abstract

In the minimal supersymmetric standard model, large left-right mixing of stau's is sometimes intriguing from phenomenological viewpoints. However, too large left-right mixing is not acceptable since the electroweak-breaking vacuum becomes metastable. In this paper the vacuum transition rate is evaluated by using semiclassical techniques, and constraints on parameters of the model are shown. In the calculation the bounce solution is derived in the multifield space. These constraints are also applied to the case of the low-energy minimal gauge mediation model.