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The fine-tuning price of neutralino dark matter in models with non-universal Higgs masses

Ellis, John, King, S.F. and Roberts, J.P (2008) The fine-tuning price of neutralino dark matter in models with non-universal Higgs masses Journal of High Energy Physics, 2008, (04, 099) (doi:10.1088/1126-6708/2008/04/099).

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We study the amounts of fine-tuning of the parameters of the MSSM with non-universal soft supersymmetry-breaking contributions to the Higgs masses (the NUHM) that would be required for the relic neutralino density to lie within the range favoured by WMAP and other astrophysical and cosmological observations. Such dark matter fine-tuning is analogous to the commonly studied electroweak fine-tuning associated with satisfying the electroweak symmetry breaking conditions, which we also study for completeness. We identify several distinct regions of the NUHM parameter space: a bulk region, a tilde tau?tilde chi10 coannihilation region, a pseudoscalar Higgs funnel region, a focus-point bino/higgsino region and a tilde nu?tilde chi10 coannihilation region. Within each region, we analyse specific representative points for which we provide breakdowns of the contributions to the dark matter fine-tuning associated with the different NUHM parameters. In general, the NUHM offers points with both smaller and larger amounts of dark matter fine-tuning than points in the corresponding regions of the CMSSM. Lower amounts of dark matter fine-tuning typically arise at points where several different (co)annihilation processes contribute, e.g., at junctions between regions with different dominant processes. We comment on the prospects for using collider measurements to estimate the likely dark matter density within the NUHM framework.

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Published date: April 2008
Keywords: Supersymmetry phenomenology, cosmology of theories beyond the sm
Organisations: High Energy Physics


Local EPrints ID: 144073
PURE UUID: 1920f6ee-afe0-458f-b1d5-3bdd20bea02e

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Date deposited: 19 Apr 2011 16:14
Last modified: 18 Jul 2017 23:08

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Author: John Ellis
Author: S.F. King
Author: J.P Roberts

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