Abstract
We revisit MSSM scenarios with light neutralino as a dark matter candidate in view of the latest LHC and dark matter direct and indirect detection experiments. We show that scenarios with a very light neutralino (~ 10 GeV) and a scalar bottom quark close in mass, can satisfy all the available constraints from LEP, Tevatron, LHC, flavour and low energy experiments and provide solutions in agreement with the bulk of dark matter direct detection experiments, and in particular with the recent CDMS results.
Highlights
Direct searches for dark matter (DM) at underground experiments and for Higgs bosons and new particles at the CERN LHC collider represent powerful probes into extensions of the Standard Model (SM), including a weakly interacting massive particle (WIMP) protected by a symmetry ensuring its stability.In the last few years, the DAMA/LIBRA [1], CoGeNT [2], and CRESST-II [3] experiments have all reported excesses of events over their estimated backgrounds, which can be interpreted as due to low-mass dark matter WIMPs interacting in their detectors
In an earlier paper [6], we showed that the events of DAMA/LIBRA, CoGeNT, and CRESST-II were consistent with a supersymmetric (SUSY) scenario with a light neutralino ~01 and an almost degenerate scalar lepton, gaugino, or scalar bottom, which would have escaped searches based on hadronic jets plus missing transverse energy (MET) signatures at the LHC, due to the very low transverse energy of the jets
The recent analysis of the CDMS-II data has isolated three possible signal events, with a small expected background [13]. If these events are due to the interaction of WIMPs in the CDMS detector, the WIMP mass and scattering cross section would be comparable to those already highlighted by the other experiments reporting possible excesses of events
Summary
Direct searches for dark matter (DM) at underground experiments and for Higgs bosons and new particles at the CERN LHC collider represent powerful probes into extensions of the Standard Model (SM), including a weakly interacting massive particle (WIMP) protected by a symmetry ensuring its stability. In the last few years, the DAMA/LIBRA [1], CoGeNT [2], and CRESST-II [3] experiments have all reported excesses of events over their estimated backgrounds, which can be interpreted as due to low-mass dark matter WIMPs interacting in their detectors. These claims had to be confronted to the negative results of searches conducted by the CDMS [4] and XENON [5] experiments, as well as the absence of new physics reported by the ATLAS and CMS experiments at the LHC.
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