Search for sharp and smooth spectral signatures of $\mu\nu$SSM gravitino dark matter with Fermi-LAT

TL;DR

This paper investigates the potential of detecting $ u$SSM gravitino dark matter through gamma-ray signatures, analyzing decay channels and comparing predictions with Fermi-LAT data to constrain model parameters.

Contribution

It provides a comprehensive analysis of $ u$SSM gravitino decay signatures, including both sharp and smooth spectral features, and derives new constraints from gamma-ray observations.

Findings

Gravitinos above 4 GeV are excluded for certain parameters.

Constraints are relaxed with large gaugino masses, excluding gravitinos above 17 GeV.

Lifetimes below $10^{28}$ seconds are incompatible with observations.

Abstract

The $\mu\nu$SSM solves the $\mu$ problem of supersymmetric models and reproduces neutrino data, simply using couplings with right-handed neutrinos $\nu$'s. Given that these couplings break explicitly $R$ parity, the gravitino is a natural candidate for decaying dark matter in the $\mu \nu$SSM. In this work we carry out a complete analysis of the detection of $\mu \nu$SSM gravitino dark matter through $\gamma$-ray observations. In addition to the two-body decay producing a sharp line, we include in the analysis the three-body decays producing a smooth spectral signature. We perform first a deep exploration of the low-energy parameter space of the $\mu \nu$SSM taking into account that neutrino data must be reproduced. Then, we compare the $\gamma$-ray fluxes predicted by the model with Fermi-LAT observations. In particular, with the 95$\%$ CL upper limits on the total diffuse extragalactic $\gamma$-ray background using 50 months of data, together with the upper limits on line emission from an updated analysis using 69.9 months of data. For standard values of bino and wino masses, gravitinos with masses larger than about 4 GeV, or lifetimes smaller than $10^{28}$ s, produce too large fluxes and are excluded as dark matter candidates. However, when limiting scenarios with large and close values of the gaugino masses are considered, the constraints turn out to be less stringent, excluding masses larger than 17 GeV and lifetimes smaller than $4\times 10^{25}$ s.