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Increasing the Neutralino Relic Abundance with Slepton Coannihilations: Consequences for Indirect Dark Matter Detection

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dc.contributor.author Provenza, Alessio en_US
dc.contributor.author Profumo, Stefano en_US
dc.date.accessioned 2006-10-11T07:24:40Z en_US
dc.date.accessioned 2011-09-07T20:27:14Z
dc.date.available 2006-10-11T07:24:40Z en_US
dc.date.available 2011-09-07T20:27:14Z
dc.date.issued 2006-10-11T07:24:40Z en_US
dc.identifier.citation JCAP 0612 (2006) 019 en_US
dc.identifier.uri http://preprints.sissa.it/xmlui/handle/1963/1870 en_US
dc.description.abstract We point out that if the lightest supersymmetric particle (LSP) is a Higgsino- or Wino-like neutralino, the net effect of coannihilations with sleptons is to increase the relic abundance, rather than producing the usual suppression, which takes place if the LSP is Bino-like. The reason for the enhancement lies in the effective thermally averaged cross section at freeze-out: sleptons annihilate (and co-annihilate) less efficiently than the neutralino(s)-chargino system, therefore slepton coannihilations effectively act as parasite degrees of freedom at freeze-out. Henceforth, the thermal relic abundance of LSP's corresponds to the cold Dark Matter abundance for smaller values of the LSP mass, and larger values of the neutralino pair annihilation cross section. In turn, at a given thermal neutralino relic abundance, this implies larger indirect detection rates, as a result of an increase in the fluxes of antimatter, gamma rays and neutrinos from the Sun orginating from neutralino pair annihilations. en_US
dc.format.extent 205353 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.relation.ispartofseries SISSA;56/2006/EP en_US
dc.relation.ispartofseries arXiv.org;hep-ph/0609290 en_US
dc.relation.uri 10.1088/1475-7516/2006/12/019 en_US
dc.title Increasing the Neutralino Relic Abundance with Slepton Coannihilations: Consequences for Indirect Dark Matter Detection en_US
dc.type Preprint en_US
dc.contributor.department Elementary Particle Theory en_US
dc.contributor.area Physics en_US


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