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Natural implementation of neutralino dark matter

Natural implementation of neutralino dark matter
Natural implementation of neutralino dark matter
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.
supersymmetry phenomenology, cosmology of theories beyond the SM
1-28
King, S.F.
f8c616b7-0336-4046-a943-700af83a1538
Roberts, J.P
2c91ea9a-930f-4266-ae19-6c1169eb7b53
King, S.F.
f8c616b7-0336-4046-a943-700af83a1538
Roberts, J.P
2c91ea9a-930f-4266-ae19-6c1169eb7b53

King, S.F. and Roberts, J.P (2006) Natural implementation of neutralino dark matter. Journal of High Energy Physics, 9 (36), 1-28. (doi:10.1088/1126-6708/2006/09/036).

Record type: Article

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.

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More information

Published date: 14 September 2006
Keywords: supersymmetry phenomenology, cosmology of theories beyond the SM

Identifiers

Local EPrints ID: 57390
URI: http://eprints.soton.ac.uk/id/eprint/57390
PURE UUID: a21acc1a-9b14-4aba-8ed0-9d582b35c974

Catalogue record

Date deposited: 14 Aug 2008
Last modified: 30 Jul 2019 17:43

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