Revisiting mGMSB in light of a 125 GeV Higgs

TL;DR

This paper examines how a Higgs boson mass of around 125 GeV constrains the parameter space and sparticle masses in minimal gauge mediated supersymmetry breaking models, revealing significant lower bounds and cosmological implications.

Contribution

It provides a detailed analysis of the impact of a 125 GeV Higgs on mGMSB models, including bounds on sparticle and gravitino masses, and explores the effects of different messenger field configurations.

Findings

Sparticle masses are constrained to several TeV or higher.

Gravitino mass lower bounds depend on messenger field number.

Non-standard cosmology is needed for consistency with observations.

Abstract

We explore the implications of a 124-126 GeV CP-even Higgs boson on the fundamental parameter space and sparticle spectroscopy of the minimal gauge mediated supersymmetry breaking (mGMSB) scenario. The above mass for the Higgs boson yields stringent lower bounds on the sparticle masses in this class of models. The lightest neutralino and stau masses lie close to 1.5 TeV and 800 GeV respectively, while the majority of the sparticle masses are in the several to multi-TeV range. We show that with a single pair of 5+\bar{5} SU(5) messenger multiplets, the lower limit on the gravitino mass is \sim 360 eV. This is reduced to about 60 eV if five pairs of 5+\bar{5} messenger fields are introduced. Non-standard cosmology and non-standard gravitino production mechanisms are required in order to satisfy cosmological observations.