Enhanced diphoton rates at Fermi and the LHC

TL;DR

This paper demonstrates that MSSM singlet extensions can simultaneously explain Fermi LAT gamma-ray signals and LHC Higgs observations, while satisfying all current experimental constraints.

Contribution

It provides a specific model example where a 130 GeV neutralino explains gamma-ray signals and a 125 GeV Higgs with enhanced diphoton decay rate, consistent with data.

Findings

Neutralino annihilation cross section matches Fermi signals.

Higgs boson mass and decay rates align with LHC measurements.

Model satisfies relic density and direct detection limits.

Abstract

We show that within MSSM singlet extensions the experimental hints beyond the standard model from the Fermi LAT telescope as well as from the LHC can be explained simultaneously while being consistent with all experimental constraints. In particular we present an example point which features a $\sim$ 130 GeV lightest neutralino with an annihilation cross section into photons consistent with the indication from the Fermi satellite with simultaneously the right relic abundance, a continuum photon spectrum consistent with observation, direct detection cross section below the experimental limits, electroweak observables consistent with experiment and a 125 GeV light Higgs boson with a slightly enhanced $h \rightarrow \gamma \gamma$ rate.