Natural Implementation of Neutralino Dark Matter

Abstract

The prediction of neutralino dark matter is generally regarded as one of the successes of the Minimal Supersymmetric Standard Model (MSSM). However the successful regions of parameter space allowed by WMAP and collider constraints are quite restricted. We discuss fine-tuning with respect to both dark matter and Electroweak Symmetry Breaking (EWSB) and explore regions of MSSM parameter space with non-universal gaugino and third family scalar masses in which neutralino dark matter may be implemented naturally. In particular allowing non-universal gauginos opens up the bulk region that allows Bino annihilation via t-channel slepton exchange, leading to ``supernatural dark matter'' corresponding to no fine-tuning at all with respect to dark matter. By contrast we find that the recently proposed ``well tempered neutralino'' regions involve substantial fine-tuning of MSSM parameters in order to satisfy the dark matter constraints, although the fine tuning may be ameliorated if several annihilation channels act simultaneously. Although we have identified regions of ``supernatural dark matter'' in which there is no fine tuning to achieve successful dark matter, the usual MSSM fine tuning to achieve EWSB always remains.

Version to appear in JHEP. 26 pages, 6 figures

References in corpus (1)

• The Well-Tempered Neutralino

Cited by in corpus (12)

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• The Dark Side of mSUGRA
• Diphoton decays of stoponium at the Large Hadron Collider
• Collider signals and neutralino dark matter detection in relic-density-consistent models without universality
• A New Measure of Fine Tuning
• Pseudo-Dirac Bino Dark Matter
• Exploring compressed supersymmetry with same-sign top quarks at the Large Hadron Collider
• Neutralino Dark Matter with Inert Higgsinos and Singlinos
• The top squark-mediated annihilation scenario and direct detection of dark matter in compressed supersymmetry
• The Fine-Tuning Price of Neutralino Dark Matter in Models with Non-Universal Higgs Masses