MeV-GeV $\gamma$-ray telescopes probing axino LSP/gravitino NLSP as dark matter in the $\mu \nu$SSM

Abstract

Axino and gravitino are promising candidates to solve the dark matter (DM) problem in the framework of supersymmetry. In this work, we assume that the axino is the lightest supersymmetric particle (LSP), and therefore contributes to DM. In the case of R-parity violating models, the axino can decay into a neutrino-photon pair with a lifetime much longer than the age of the Universe, yielding a potentially detectable signal. Interestingly, a gravitino next-to-LSP (NLSP) can live enough as to contribute to the relic density. We study both scenarios, only axino LSP as DM, and axino LSP with gravitino NLSP as DM. We carry out the analysis in the context of the $\mu \nu$SSM, which solves the $\mu$ problem and reproduces neutrino data, only adding couplings involving right-handed neutrinos. In particular, we perform a complete analysis of the relevant parameter space of the model considering constraints from neutrino physics, cosmological observations, and $\gamma$-ray detection. We find that the axino or the gravitino can produce a signal detectable by future MeV-GeV $\gamma$-ray telescopes. In addition, in a parameter region where we get a well-tempered mixture of both particles, a double-line signal arises as a smoking gun.

Version published in JCAP, discussions expanded, references added, 27 pages, 6 figures

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Cited by in corpus (16)

• The new $(g-2{)}_{\mu }$ result and the $\mu \nu$SSM
• Dark matter searches by the planned gamma-ray telescope GAMMA-400
• Searching for Supersymmetry: The $\mu \nu$SSM
• Higgs boson decay $h\to Z\gamma$ and muon magnetic dipole moment in the $\mu \nu$SSM
• munuSSM: A python package for the $\mu$-from-$\nu$ Supersymmetric Standard Model
• Portal Effective Theories: A framework for the model independent description of light hidden sector interactions
• Muon anomalous magnetic dipole moment in the $\mu \nu$SSM
• Vacuum (meta-)stability in the $\mu \nu$SSM
• WIMP Dark Matter in the U$\mu \nu$SSM
• Phenomenological implications of sterile neutrinos in the $\mu \nu$SSM and dark matter
• Lightest Higgs boson decays $h\to MZ$ in the $\mu$ from $\nu$ supersymmetric standard model
• Right-handed sneutrino and gravitino multicomponent dark matter in light of neutrino detectors
• Right-handed neutrinos, domain walls and tadpoles in the superstring inspired $\mu \nu$SSM
• Fenomenología de modelos supersimétricos: partículas y materia oscura
• Searching for Gluino LSP at the LHC
• Searching for stop LSP at the LHC