P. S. Bhupal Dev, Subhadeep Mondal, Biswarup Mukhopadhyaya, Sourov Roy
We study the possibility of a light Dark Matter (DM) within a constrained Minimal Supersymmetric Standard Model (cMSSM) framework augmented by a SM singlet-pair sector to account for the non-zero neutrino masses by inverse seesaw mechanism. Working within a `hybrid' scenario with the MSSM sector fixed at high scale and the singlet neutrino sector at low scale, we find that, contrary to the case of pure cMSSM where the neutralino DM cannot be very light, we can have a light sneutrino DM below 100 GeV satisfying all the current experimental constraints from cosmology, collider as well as low-energy experiments. We also note that the supersymmetric inverse seesaw mechanism with sneutrino as the lightest supersymmetric partner can have enhanced same-sign dilepton final states with large missing transverse energy (mET) coming from gluino and squark pair as well as squark-gluino associated productions and their cascade decay through charginos. We present a collider study for the same-sign dilepton+jets+mET signal in this scenario and propose some distinctions with a pure cMSSM case which also gives the same-sign dilepton final states. We also comment on the implications of such a light DM scenario on the invisible decay width of an 125 GeV Higgs boson.
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http://arxiv.org/abs/1207.6542
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