The \mu-problem, the NMSSM and string theory

TL;DR

This paper explores string theory solutions to the supersymmetric mu-problem, focusing on heterotic orbifolds and NMSSMs, which can naturally generate the mu-term and reduce fine-tuning in the MSSM.

Contribution

It presents recent developments in string-derived models, showing how approximate R symmetries and NMSSMs can naturally solve the mu-problem.

Findings

Approximate R symmetry induces mu-term in orbifold models.

String-derived NMSSMs offer a natural mu-term solution.

Models help avoid fine-tuning in the MSSM.

Abstract

We discuss recent developments on the solution of the so-called supersymmetric mu-problem in the context of heterotic orbifolds. In particular, an approximate R symmetry can induce an admissible mu-term in Minkowski vacua of orbifold models with the MSSM spectrum. A natural solution to the mu-problem is also offered by explicit string-derived NMSSMs. These models help avoid the fine-tuning of the MSSM.