Right-handed sneutrino and gravitino multicomponent dark matter in light of neutrino detectors

Abstract We investigate the possibility that right-handed (RH) sneutrinos and gravitinos can coexist explain dark matter (DM) problem. compare extensions of minimal supersymmetric standard model (MSSM) next-to-MSSM (NMSSM) adding RH neutrinos superfields, with special emphasis on latter. If gravitino is lightest particle (LSP) sneutrino next-to-LSP (NLSP), heavier decays to former plus left-handed (LH) through mixing between scalar partners LH neutrinos. However, interaction suppressed by Planck mass, if LH-RH parameter small, ≪ O (10 -2 ), a long-lived NLSP possible even surpassing age Universe. As byproduct, LSP decay produces monochromatic in ballpark current planned neutrino telescopes like Super-Kamiokande, IceCube Antares we use set constraints show prospects detection. In NMSSM+RHN, assuming gluino mass M 3 = TeV found following lower limits for m 3/2 ≳ 1-600 GeV reheating temperature T R 10 5 - × 7 GeV, ν̃ 10-800 GeV. take TeV, then are relaxed one order magnitude.