Abstract
Different mechanisms operate in various regions of the MSSM parameter space to bring the relic density of the lightest neutralino, tilde{chi }^0_{1}, assumed here to be the lightest SUSY particle (LSP) and thus the dark matter (DM) particle, into the range allowed by astrophysics and cosmology. These mechanisms include coannihilation with some nearly degenerate next-to-lightest supersymmetric particle such as the lighter stau tilde{tau }_{1}, stop tilde{t}_{1} or chargino tilde{chi }^pm _{1}, resonant annihilation via direct-channel heavy Higgs bosons H / A, the light Higgs boson h or the Z boson, and enhanced annihilation via a larger Higgsino component of the LSP in the focus-point region. These mechanisms typically select lower-dimensional subspaces in MSSM scenarios such as the CMSSM, NUHM1, NUHM2, and pMSSM10. We analyze how future LHC and direct DM searches can complement each other in the exploration of the different DM mechanisms within these scenarios. We find that the {tilde{tau }_1} coannihilation regions of the CMSSM, NUHM1, NUHM2 can largely be explored at the LHC via searches for / !!!! E_T events and long-lived charged particles, whereas their H / A funnel, focus-point and tilde{chi }^pm _{1} coannihilation regions can largely be explored by the LZ and Darwin DM direct detection experiments. We find that the dominant DM mechanism in our pMSSM10 analysis is tilde{chi }^pm _{1} coannihilation: parts of its parameter space can be explored by the LHC, and a larger portion by future direct DM searches.
Highlights
The density of cold dark matter (CDM) in the Universe is very tightly constrained, in particular by measurements of the cosmic microwave background radiation, which yield CDMh2 = 0.1186 ± 0.0020 [1] and are consistent with other, less precise, determinations
Different mechanisms operate in various regions of the minimal SUSY extension of the Standard Model (MSSM) parameter space to bring the relic density of the lightest neutralino, χ10, assumed here to be the lightest SUSY particle (LSP) and the dark matter (DM) particle, into the range allowed by astrophysics and cosmology
We find that the τ1 coannihilation regions of the constrained MSSM (CMSSM), NUHM1, NUHM2 can largely be explored at the LHC via searches for E/T events and longlived charged particles, whereas their H/A funnel, focuspoint and χ1± coannihilation regions can largely be explored by the LZ and Darwin DM direct detection experiments
Summary
The density of cold dark matter (CDM) in the Universe is very tightly constrained, in particular by measurements of the cosmic microwave background radiation, which yield CDMh2 = 0.1186 ± 0.0020 [1] and are consistent with other, less precise, determinations This determination of the CDM density at the percent level imposes a corresponding constraint on the parameters of any model that provides the dominant fraction of the CDM density. Reproducing correctly the cosmological CDM density requires, in general, some special choice of the SUSY model parameters, which may be some particular combination of sparticle masses and/or couplings Examples of the former include hypersurfaces in the SUSY parameter space where the LSP is almost degenerate in mass with some next-tolightest SUSY particle (NLSP), such as the lighter stau τ1.
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