10 GeV neutralino dark matter and light stau in the MSSM

TL;DR

This paper investigates whether a 10 GeV neutralino dark matter candidate in the MSSM, annihilating via light staus, can explain gamma-ray observations and satisfy collider and precision constraints.

Contribution

It analyzes the parameter space of light staus and neutralinos in the MSSM, linking gamma-ray signals with collider bounds and Higgs decay enhancements.

Findings

10 GeV neutralino can explain gamma-ray emission via tau final states

Light stau masses consistent with LEP and electroweak constraints

Possible enhancement of Higgs to diphoton decay rate

Abstract

It has recently been pointed out that a component of the observed gamma ray emission in the low-latitudes of Fermi Bubble has a spectral shape that can be explained by a 10 GeV dark matter (DM) annihilating to tau leptons with a cross-section of 2 x 10^{-27} cm^3/s. Motivated by this possibility, we revisit the annihilation of a 10 GeV neutralino DM in the MSSM via stau exchange. The required stau masses and mixing, consistent with LEP direct search and electroweak precision constraints, are correlated with a possible enhancement of the Higgs decay rate to two photons. We also explore the implications of such a scenario for DM relic density and the muon anomalous magnetic moment, taking into account the recent ATLAS bounds on the chargino and the first two generation slepton masses, as well as the constraints on the Higgsino fraction of a 10 GeV neutralino.