Constraints from Charge and Colour Breaking Minima in the (M+1)SSM

TL;DR

This paper investigates how charge and color breaking minima constraints restrict the parameter space of the (M+1)SSM, revealing more severe limitations than in the MSSM and discussing their phenomenological consequences.

Contribution

It extends the analysis of charge and color breaking minima constraints from the MSSM to the (M+1)SSM, showing that similar constraints apply despite additional singlet fields.

Findings

Constraints are more restrictive in the (M+1)SSM than in the MSSM.

UFB directions are no longer F-flat but still impose significant bounds.

Phenomenological implications include tighter parameter space restrictions.

Abstract

We study the constraints on the parameter space of the supersymmetric standard model extended by a gauge singlet, which arise from the absence of global minima of the effective potential with slepton or squark vevs. Particular attention is paid to the so-called ``UFB'' directions in field space, which are F-flat in the MSSM. Although these directions are no longer F-flat in the (M+1)SSM, we show that the corresponding MSSM-like constraints on m_0/M_{1/2} apply also to the (M+1)SSM. The net effect of all constraints on the parameter space are more dramatic than in the MSSM. We discuss the phenomenological implications of these constraints.