Sneutrino dark matter: Symmetry protection and cosmic ray anomalies

Abstract

We present an R-parity conserving model of sneutrino dark matter within a Higgsphilic Uð1Þ 0 extension of the minimal supersymmetric standard model. In this theory, the parameter and light Dirac neutrino masses are generated naturally upon the breaking of the Uð1Þ 0 gauge symmetry. One of the right-handed sneutrinos is the lightest supersymmetric particle. The leptonic and hadronic decays of another sneutrino, taken to be the next-to-lightest superpartner, allow for a natural fit to the recent results reported by the PAMELA experiment. We perform a detailed calculation of the dark matter relic density in this scenario, and show that the model is consistent with the ATIC and Fermi LAT experiments.

The Next-to-Minimal Supersymmetric Standard Model

“…SUSY models of sterile neutrinos can be naturally realised in U(1) ′ extended models [472]: sterile neutrino masses of O(1 eV) and mixings among the active and sterile neutrinos can then be obtained via the high-dimensional operators, generated by integrating out the heavy fields. In U(1) ′ extended models where the vev s generates Dirac neutrino masses through a dimension-4 term in the superpotential, the decays of the LSP and NLSP (the two lightest sneutrinos) could explain the PAMELA anomaly [475].…”

Neutralino and chargino production in U(1)′ at the LHC

“…Older analyses are available for MSSM [23], though the production, decay and identification of charginos and neutralinos have received some attention very recently, given the failure to find squarks and gluinos at the LHC [24]. While in a previous work [25], we showed that in a minimal U (1) ′ model (with one extra singlet boson), choosing the right-handed sneutrino as the LSP could be consistent with the excess positron observed in satellite experiments, for the purpose of this work, in the secluded sector U(1) ′ , we take the lightest neutralino consistently to be the lightest supersymmetric particle (LSP) and therefore a dark matter (DM) candidate.…”

Scalar neutrinos at the LHC

“…In a previous work [8], we showed that a minimal U(1) ′ model (one extra singlet boson) could be consistent with the excess positron observed in satellite experiments, choosing on of the right-handed sneutrinos as the LSP. However, for the purpose of this work (dependent on parameter space chosen to compare our results with those of MSSM), the secluded sector U(1)…”

“…′ model with one singlet and right handed sneutrinos [8] can explain the excess positron flux observed by various satellite experiments. However, this requires a rather special mass spectrum.…”