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

GERMAN A. GOMEZ-VARGAS, DANIEL E. LOPEZ -FOGLIANI, CARLOS MUNOZ, ANDRES D. PEREZ

ASTROPARTICLE PHYSICS

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 2021 vol. 125 p. 1 - 10

0927-6505

In R-parity violating supersymmetry, the gravitino as the lightestsupersymmetric particle (LSP) is a good candidate for dark matter,with the interesting characteristic to be detectable through γ-raytelescopes. We extend this analysis considering an axino next-to-LSP(NLSP) as a coexisting dark matter particle contributing with adetectable signal in the γ-ray spectrum. The analysis is carried outin the framework of the μνSSM, which solves the μ problemreproducing simultaneously neutrino data only with the addition ofright-handed neutrinos. We find that important regions of theparameter space can be tested by future MeV-GeV γ-ray telescopesthrough the line signal coming from the decay of the axino NLSP intophoton-neutrino. In a special region, a double-line signal from axinoNLSP and gravitino LSP is possible with both contributionsdetectable.p { margin-bottom: 0.1in; line-height: 120%; }a:link { }