Abstract
The discovery of a Higgs boson with a mass of 126 GeV at the LHC when combined with the non-observation of new physics both in direct and indirect searches imposes strong constraints on supersymmetric models and in particular on the top squark sector. The experiments for direct detection of dark matter have provided with yet more constraints on the neutralino LSP mass and its interactions. After imposing limits from the Higgs, flavour and dark matter sectors, we examine the feasibility for a light stop in the context of the pMSSM, in light of current results for stop and other SUSY searches at the LHC. We only require that the neutralino dark matter explains a fraction of the cosmologically measured dark matter abundance. We find that a stop with mass below ∼ 500 GeV is still allowed. We further study various probes of the light stop scenario that could be performed at the LHC Run-II either through direct searches for the light and heavy stop, or SUSY searches not currently available in simplified model results. Moreover we study the characteristics of heavy Higgs for the points in the parameter space allowed by all the available constraints and illustrate the region with large cross sections to fermionic or electroweakino channels. Finally we show that nearly all scenarios with a small stop-LSP mass difference will be tested by Xenon1T provided the NLSP is a chargino, thus probing a region hard to access at the LHC.
Highlights
Keep electroweak precision observables under control and to some extent ameliorate the tension with limits on flavour observables
After imposing limits from the Higgs, flavour and dark matter sectors, we examine the feasibility for a light stop in the context of the phenomenological MSSM (pMSSM), in light of current results for stop and other SUSY searches at the LHC
No statistical meaning can be attached to these numbers, table 2 and the accompanying discussion helps to get an understanding of how the various type of data constrain the MSSM parameter space
Summary
We have chosen a simplified version of the pMSSM where only the ten parameters most relevant for the Higgs and DM sector are let to vary. Note that sleptons close in mass to the LSP can give an important contribution to DM (co-)annihilation, for example this occurs frequently for staus within the constrained MSSM. We ignore this possibility here since the importance of coannihilation will be illustrated with third generation squarks, coannihilation with sleptons rely on. We have used SuSpect-2.41 [87] to compute the pMSSM mass spectrum for a given set of input parameters. This includes two-loop corrections to the Higgs mass and NLO corrections to SUSY particle masses. A more refined analysis along the lines of [88,89,90] might improve the constraints in the large At region
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