Abstract
We perform a likelihood analysis of the constraints from accelerator experiments and astrophysical observations on supersymmetric (SUSY) models with SU(5) boundary conditions on soft SUSY-breaking parameters at the GUT scale. The parameter space of the models studied has seven parameters: a universal gaugino mass m_{1/2}, distinct masses for the scalar partners of matter fermions in five- and ten-dimensional representations of SU(5), m_5 and m_{10}, and for the mathbf {5} and {bar{mathbf{5}}} Higgs representations m_{H_u} and m_{H_d}, a universal trilinear soft SUSY-breaking parameter A_0, and the ratio of Higgs vevs tan beta . In addition to previous constraints from direct sparticle searches, low-energy and flavour observables, we incorporate constraints based on preliminary results from 13 TeV LHC searches for jets + events and long-lived particles, as well as the latest PandaX-II and LUX searches for direct Dark Matter detection. In addition to previously identified mechanisms for bringing the supersymmetric relic density into the range allowed by cosmology, we identify a novel {tilde{u}_R}/{tilde{c}_R} - tilde{chi }^{0}_{1} coannihilation mechanism that appears in the supersymmetric SU(5) GUT model and discuss the role of {{tilde{nu }}_tau } coannihilation. We find complementarity between the prospects for direct Dark Matter detection and SUSY searches at the LHC.
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