Abstract
We investigate the prospects for detection of neutralino dark matter in the 19-parameter phenomenological MSSM (pMSSM). We explore very wide ranges of the pMSSM parameters but pay particular attention to the higgsino-like neutralino at the ~ 1 TeV scale, which has been shown to be a well motivated solution in many constrained supersymmetric models, as well as to a wino-dominated solution with the mass in the range of 2-3 TeV. After summarising the present bounds on the parameter space from direct and indirect detection experiments, we focus on prospects for detection of the Cherenkov Telescope Array (CTA). To this end, we derive a realistic assessment of the sensitivity of CTA to photon fluxes from dark matter annihilation by means of a binned likelihood analysis for the Einasto and Navarro-Frenk-White halo profiles. We use the most up to date instrument response functions and background simulation model provided by the CTA Collaboration. We find that, with 500 hours of observation, under the Einasto profile CTA is bound to exclude at the 95% C.L. almost all of the ~ 1 TeV higgsino region of the pMSSM, effectively closing the window for heavy supersymmetric dark matter in many realistic models. CTA will be able to probe the vast majority of cases corresponding to a spin-independent scattering cross section below the reach of 1-tonne underground detector searches for dark matter, in fact even well below the irreducible neutrino background for direct detection. On the other hand, many points lying beyond the sensitivity of CTA will be within the reach of 1-tonne detectors, and some within collider reach. Altogether, CTA will provide a highly sensitive way of searching for dark matter that will be partially overlapping and partially complementary with 1-tonne detector and collider searches, thus being instrumental to effectively explore the nearly full parameter space of the pMSSM.
Highlights
JHEP02(2015)014 observations of neutrinos from the Sun, and in monojet searches at the LHC [9] for some choices of interactions and mediator masses
We investigate the prospects for detection of neutralino dark matter in the 19parameter phenomenological Minimal Supersymmetric Standard Model (MSSM)
After summarising the present bounds on the parameter space from direct and indirect detection experiments, we focus on prospects for detection of the Cherenkov Telescope Array (CTA)
Summary
The pMSSM with 19 free parameters gives a generic coverage of the properties of the CP and R parity conserving MSSM. We assume Gaussian distributions for the constraints, with the exception of those on the Higgs sector, which are imposed through HiggsSignals and HiggsBounds, and the constraints on σpSI from LUX [6]. Some of the scans are driven by the constraint on the anomalous magnetic moment of the muon, δ (g − 2)μ [98, 99], we present our results irrespective of whether the measurement of δ (g − 2)μ is satisfied, as the result is still somewhat controversial and favours the low-mass neutralino region, which is starting to show some tension with data from the LHC. Ωχh2 0.12, the relic density is imposed as an upper bound only, by means of a half Gaussian likelihood
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