Abstract
We present a new global fit of the 19-dimensional phenomenological Minimal Supersymmetric Standard Model (pMSSM-19) that complies with all the latest experimental results from dark matter indirect, direct and accelerator dark matter searches. We show that the model provides a satisfactory explanation of the excess of gamma rays from the Galactic centre observed by the Fermi Large Area Telescope, assuming that it is produced by the annihilation of neutralinos in the Milky Way halo. We identify two regions that pass all the constraints: the first corresponds to neutralinos with a mass 0∼ 80−10 GeV annihilating into WW with a branching ratio of 95%; the second to heavier neutralinos, with mass 0∼ 180−20 GeV annihilating into t̄t with a branching ratio of 87%. We show that neutralinos compatible with the Galactic centre GeV excess will soon be within the reach of LHC run-II—notably through searches for charginos and neutralinos, squarks and light smuons—and of Xenon1T, thanks to its unprecedented sensitivity to spin-dependent cross-section off neutrons.
Highlights
The theoretical framework: the phenomenological Minimal Supersymmetric Standard Model (pMSSM)We here study the pMSSM [29], in which the number of free parameters can be reduced to 19, given the present lack of experimental evidence for SUSY and no experimental indication that one requires the full freedom of a 22-dimensional pMSSM at present
Supersymmetric Standard Model that comply with all the latest experimental results from dark matter indirect, direct and accelerator dark matter searches
We here study the phenomenological Minimal Supersymmetric Standard Model (pMSSM) [29], in which the number of free parameters can be reduced to 19, given the present lack of experimental evidence for SUSY and no experimental indication that one requires the full freedom of a 22-dimensional pMSSM at present
Summary
We here study the pMSSM [29], in which the number of free parameters can be reduced to 19, given the present lack of experimental evidence for SUSY and no experimental indication that one requires the full freedom of a 22-dimensional pMSSM at present In this model, the lightest supersymmetric particle is the lightest neutralino, χ, a combination the neutral electroweak gauginos and higgsinos fields. In our set-up, the Higgs sector is fully described by the ratio of the Higgs vacuum expectation values tan β, the higgsino mass parameter μ and the mass of the pseudoscalar Higgs mA, which are more directly related to the phenomenology of the model. All of the input parameters are defined at the SUSY scale √mt1mt
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