Singlet deflected anomaly/gauge mediation

TL;DR

This paper explores an extended anomaly/gauge mediation model involving a singlet, addressing the mu-b_mu problem and examining cosmological constraints and R-parity violation effects.

Contribution

It introduces a novel scenario with direct singlet interactions in anomaly/gauge mediation, providing a viable NMSSM-like framework free of the mu-b_mu problem.

Findings

Viable NMSSM-like scenario without mu-b_mu problem

Cosmological constraints favor small anomaly-mediation contributions

R-parity violation enlarges parameter space significantly

Abstract

We study an extension of the standard anomaly/gauge mediation scenario where the messenger fields have direct interactions with an extra gauge singlet. This realizes a phenomenologically viable NMSSM-like scenario free of the mu-b_mu problem. Current cosmological constraints imply a small size for the anomaly-mediation contributions, unless some source of R-parity violation is permitted. In the latter case the allowed regions in the parameter space can be substantially larger than in the corresponding gauge-mediation scenario.