Abstract
In SUSY, a light dark matter is usually accompanied by light scalars to achieve the correct relic density, which opens new decay channels of the SM like Higgs boson. Under current experimental constraints including the latest LHC Higgs data and the dark matter relic density, we examine the status of a light neutralino dark matter in the framework of NMSSM and confront it with the direct detection results of CoGeNT, CDMS-II and LUX. We have the following observations: (i) A dark matter as light as 8 GeV is still allowed and its scattering cross section off the nucleon can be large enough to explain the CoGeNT/CDMS-II favored region; (ii) The LUX data can exclude a sizable part of the allowed parameter space, but still leaves a light dark matter viable; (iii) The SM-like Higgs boson can decay into the light dark matter pair with an invisible branching ratio reaching 30% under the current LHC Higgs data, which may be tested at the 14 TeV LHC experiment.
Highlights
A numerical scanIn order to reduce the number of free parameters in our scan over the NMSSM parameter space, we make some assumptions on the parameters that do not influence DM properties significantly
JHEP05(2014)056 the spin-independent neutralino-nucleon scattering cross section can be enhanced to reach the CDMS-II value by the t−channel mediation of a light h1 [23, 24]
Under current experimental constraints including the latest LHC Higgs data and the dark matter relic density, we examine the status of a light neutralino dark matter in the framework of NMSSM and confront it with the direct detection results of CoGeNT, CDMS-II and LUX
Summary
In order to reduce the number of free parameters in our scan over the NMSSM parameter space, we make some assumptions on the parameters that do not influence DM properties significantly. Note here that the ranges of λ and κ a√re motivated to avoid Landau pole, generally corresponding to the requirement of λ2 + κ2 0.7 This has been encoded in NMSSMTools-4.0.0 including the consideration of the interplay between λ and κ in the renormalization group running. Note that we artificially impose a lower bound of 320 GeV for M2 This is motivated by the fact that M2 in our study is not an important parameter, and that as required by the 3l+ E/T constraint M2 should be larger than about 320 GeV in the simplified model discussed in [32, 33] ( see the constraint (viii) discussed below). We require our samples to be consistent with the Higgs data at 2σ level, which corresponds to χ2 − χ2min < 4.0 with χ2 obtained with the HiggsSignals and χ2min denoting the minimum value of χ2 for the surviving samples in our scan. This equation indicates that, if λ and κ approach zero, the couplings ChSMh1h1, ChSMa1a1 can not be very large; while if both of them have a moderate value, accidental cancelation is very essential to suppress the couplings
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