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 $$ /fb of LHC data at 13 TeV and PICO, XENON1T and PandaX-II searches for dark matter scattering, as well as previous accelerator and astrophysical measurements, presenting fits both with and without the $$ constraint. The pMSSM11 is specified by the following parameters: 3 gaugino masses $$ , a common mass for the first-and second-generation squarks $$ and a distinct third-generation squark mass $$ , a common mass for the first-and second-generation sleptons $$ and a distinct third-generation slepton mass $$ , a common trilinear mixing parameter A, the Higgs mixing parameter $$ , the pseudoscalar Higgs mass $$ and $$ . In the fit including $$ , a Bino-like $$ is preferred, whereas a Higgsino-like $$ is mildly favoured when the $$ 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, $$ , into the range indicated by cosmological data. In the fit including $$ , coannihilations with $$ and the Wino-like $$ or with nearly-degenerate first- and second-generation sleptons are active, whereas coannihilations with the $$ and the Higgsino-like $$ or with first- and second-generation squarks may be important when the $$ constraint is dropped. In the two cases, we present $$ 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 $$ constraint, as well as for discovering electroweakly-interacting sparticles at a future linear $$ collider such as the ILC or CLIC.