We use MasterCode to perform a frequentist analysis of the constraints on a phenomenological MSSM model with 11 parameters, the pMSSM$_{11}$, including constraints from ∼36/fb of LHC data at 13 TeV and PICO, XENON$_1$T and PandaX-II searches for dark matter scattering, as well as previous accelerator and astrophysical measurements, presenting fits both with and without the (g−2)$_μ$ constraint. The pMSSM$_{11}$ is specified by the following parameters: 3 gaugino masses M$_{1,2,3}$, a common mass for the first-and second-generation squarks $m_{\tilde{q}}$ and a distinct third-generation squark mass $m_{\tilde{q}}3$, a common mass for the first-and second-generation sleptons $m_{\tilde{ℓ}}$ and a distinct third-generation slepton mass $m_{\tilde{τ}}$, a common trilinear mixing parameter A, the Higgs mixing parameter μ, the pseudoscalar Higgs mass $M_A$ and tanβ. In the fit including (g−2)$_μ$, a Bino-like $\tilde{χ}^{0}_1$ is preferred, whereas a Higgsino-like $\tilde{χ}^{0}_1$ is mildly favoured when the (g−2)$_μ$ constraint is dropped. We identify the mechanisms that operate in different regions of the pMSSM${11}$ parameter space to bring the relic density of the lightest neutralino, $\tilde{χ}^{0}_1$, into the range indicated by cosmological data. In the fit including (g−2)$_μ$, coannihilations with $\tilde{χ}^{0}_2$ and the Wino-like $\tilde{χ}^{±}_1$ or with nearly-degenerate first- and second-generation sleptons are active, whereas coannihilations with the $\tilde{χ}^{0}_2$ and the Higgsino-like $\tilde{χ}^{±}_1$ or with first- and second-generation squarks may be important when the (g−2)$_μ$ constraint is dropped. In the two cases, we present $χ^2$ 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 (g−2)$_μ$ constraint, as well as for discovering electroweakly-interacting sparticles at a future linear $e^{+}e^−$ collider such as the ILC or CLIC.

The European physical journal / C 78(3), 256 (2018). doi:10.1140/epjc/s10052-018-5697-0

Published by Springer, Berlin