Collider signals and neutralino dark matter detection in relic-density-consistent models without universality

Abstract

We present brief synopses of supersymmetric models where either the neutralino composition or its mass is adjusted so that thermal relic neutralinos from the Big Bang saturate the measured abundance of cold dark matter in the universe. We first review minimal supergravity (mSUGRA), and then examine its various one-parameter extensions where we relax the assumed universality of the soft supersymmetry breaking parameters. Our goal is to correlate relic-density-allowed parameter choices with expected phenomena in direct, indirect and collider dark matter search experiments. For every non-universal model, we first provide plots to facilitate the selection of ``dark-matter allowed'' parameter space points, and then present salient features of each model with respect to searches at Tevatron, LHC and ILC and also direct and indirect dark matter searches. We present benchmark scenarios that allow one to compare and contrast the non-universal models with one another and with the paradigm mSUGRA framework. We show that many implications about sparticle properties and collider signals drawn from the analysis of the relic density constraint within mSUGRA do not carry over to simple one-parameter extensions of the mSUGRA framework. We find that in many relic-density-consistent models, there is one (or more) detectable edge in the invariant mass distribution of same-flavour, opposite sign dileptons in SUSY cascade decay events at the LHC. Finally, we scan the parameter space of these various models, requiring consistency with the LEP2 constraint on the chargino mass, and with the observed relic density, and examine prospects for direct and indirect dark matter detection. We find that in a large number of cases the mechanism that causes the early universe neutralino annihilation rate to be large (so as to produce the measured relic density) also enhances the direct detection rate, and often also the rates for indirect detection of neutralino dark matter.

53 pages, 24 figures; (v2) references added, version to appear in JHEP

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• Low Mass Gluino within the Sparticle Landscape, Implications for Dark Matter, and Early Discovery Prospects at LHC-7
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• Heavy-flavour tagging and the supersymmetry reach of the CERN Large Hadron Collider
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• Resonant scattering and recombination of pseudo-degenerate WIMPs
• Signatures of gaugino mass non-universality in cascade Higgs production at the LHC
• Searching for the Higgsino-Bino Sector at the LHC
• Discriminating Electroweak-ino Parameter Ordering at the LHC and Its Impact on LFV Studies
• A Phenomenological study on the wino radiative decay in anomalous $U(1{)}^{\prime }$ models
• Implications of different supersymmetry breaking patterns for the spectrum and decay of neutralinos and charginos
• Correlation between direct dark matter detection and Br(B_s -> mu mu) with a large phase of B_s - anti-B_s mixing
• Muons from Neutralino Annihilations in the Sun: Flipped SU(5)