Likelihood analysis of the pMSSM11 in light of LHC 13-TeV data

We use MasterCode to perform a frequentist analysis of the constraints on a phenomenological MSSM model with 11 parameters, the pMSSM11, including constraints from [Formula: see text] /fb of LHC data at 13 TeV and PICO, XENON1T and PandaX-II searches for dark matter scattering, as well as previous accelerator and astrophysical measurements, presenting fits both with and without the [Formula: see text] constraint. The pMSSM11 is specified by the following parameters: 3 gaugino masses [Formula: see text] , a common mass for the first-and second-generation squarks [Formula: see text] and a distinct third-generation squark mass [Formula: see text] , a common mass for the first-and second-generation sleptons [Formula: see text] and a distinct third-generation slepton mass [Formula: see text] , a common trilinear mixing parameter A, the Higgs mixing parameter [Formula: see text] , the pseudoscalar Higgs mass [Formula: see text] and [Formula: see text] . In the fit including [Formula: see text] , a Bino-like [Formula: see text] is preferred, whereas a Higgsino-like [Formula: see text] is mildly favoured when the [Formula: see text] constraint is dropped. We identify the mechanisms that operate in different regions of the pMSSM11 parameter space to bring the relic density of the lightest neutralino, [Formula: see text] , into the range indicated by cosmological data. In the fit including [Formula: see text] , coannihilations with [Formula: see text] and the Wino-like [Formula: see text] or with nearly-degenerate first- and second-generation sleptons are active, whereas coannihilations with the [Formula: see text] and the Higgsino-like [Formula: see text] or with first- and second-generation squarks may be important when the [Formula: see text] constraint is dropped. In the two cases, we present [Formula: see text] functions in two-dimensional mass planes as well as their one-dimensional profile projections and best-fit spectra. Prospects remain for discovering strongly-interacting sparticles at the LHC, in both the scenarios with and without the [Formula: see text] constraint, as well as for discovering electroweakly-interacting sparticles at a future linear [Formula: see text] collider such as the ILC or CLIC.