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.
Highlights
In addition to previously identified mechanisms for bringing the supersymmetric relic density into the range allowed by cosmology, we identify a novel u R/cR − χ10 coannihilation mechanism that appears in the supersymmetric SU(5) GUT model and discuss the role of ντ coannihilation
One point of view has been to consider the simple parametrization of soft SUSY breaking in which the gaugino and scalar masses, as well as the trilinear soft SUSY-breaking parameters, are all constrained to be universal at the SUSY GUT scale
We have explored in this paper the experimental, phenomenological, astrophysical and cosmological constraints on the minimal SUSY SU(5) GUT model
Summary
In the absence so far of any experimental indications of supersymmetry (SUSY) [1,2,3,4,5,6,7,8,9], nor any clear theoretical guidance how SUSY may be broken, the building of models and the exploration of phenomenological constraints on them [10,11,12,13,14,15,16,17] have adopted a range of assumptions. An alternative point of view has been to discard all universality assumptions, and treat the soft SUSY-breaking parameters as all independent phenomenological quantities (the pMSSM [15,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64]), imposing diagonal mass matrices and the minimal flavour violation (MFV) criterion Intermediate between these extremes, models with one or two non-universal soft SUSY-breaking 104 Page 2 of 29. C (2017) 77:104 contributions to Higgs masses (the NUHM1 [10,11,12,13,65,66,67,68,69] and NUHM2 [14,67,68,69,70,71]) have been considered
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