Status of CMSSM in light of current LHC Run-2 and LUX data

TL;DR

This study assesses the current viability of the CMSSM model using comprehensive data from LHC Run-2, LUX, and other experiments, revealing significant restrictions on its parameter space and predicting higher mass bounds for supersymmetric particles.

Contribution

It provides the first global fit of the CMSSM incorporating the latest LHC and LUX data, updating the status and constraints of the model.

Findings

Stau coannihilation region mostly excluded by LHC Run-2.

LUX-2016 limits heavily restrict focus point region.

Masses of stop, neutralino, and gluino are pushed to higher values.

Abstract

Motivated by the latest results of the LHC Run-2 and LUX experiments, we examine the status of the constrained minimal supersymmetric standard model (CMSSM) by performing a global fit. We construct a likelihood function including the electroweak precision observables, $B$-physics measurements, LHC Run-1 and -2 data of SUSY direct searches, Planck observation of the dark matter relic density and the combined LUX Run-3 and -4 detection limits. Based on the profile likelihood functions of 1 billion samples, we obtain the following observations: (i) The stau coannihilation region has been mostly excluded by the latest LHC Run-2 data; (ii) The focus point region has been largely covered by the LUX-2016 limits while the $A$-funnel region has been severely restricted by flavor observables like $B_s \to \mu^+\mu^-$. The remaining parts of both regions will be totally covered by the future LZ dark matter experiment; (iii) The masses of the stop, the lightest neutralino and the gluino have been pushed up to 1033 GeV, 449 GeV and 2285 GeV, respectively.