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Neutralino relic density in minimal supergravity with co-annihilations

Neutralino relic density in minimal supergravity with co-annihilations
Neutralino relic density in minimal supergravity with co-annihilations
We evaluate the relic density of neutralinos in the minimal supergravity (mSUGRA) model. All 2?2 neutralino annihilation diagrams, as well as all processes involving sleptons, charginos, neutralinos and third generation squarks are included. Relativistic thermal averaging of the velocity times cross sections is performed. We find that co-annihilation effects are only important on the edges of the model parameter space, where some amount of fine-tuning is necessary to obtain a reasonable relic density. Alternatively, at high tan ?, annihilation through very broad Higgs resonances gives rise to an acceptable neutralino relic density over broad regions of parameter space where little or no fine-tuning is needed. Finally, we compare our results against the reach of various e+e? and hadron colliders for supersymmetric matter.
dark matter, supersymmetric standard model
1-20
Baer, Howard
193c3082-95fb-469b-9548-e972a10e9341
Balázs, Csaba
9112535d-e793-4c3c-91a1-52ce80728e8a
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3
Baer, Howard
193c3082-95fb-469b-9548-e972a10e9341
Balázs, Csaba
9112535d-e793-4c3c-91a1-52ce80728e8a
Belyaev, Alexander
6bdb9638-5ff9-4b65-a8f2-34bae3ac34b3

Baer, Howard, Balázs, Csaba and Belyaev, Alexander (2002) Neutralino relic density in minimal supergravity with co-annihilations. Journal of High Energy Physics, JHEP03 (42), 1-20. (doi:10.1088/1126-6708/2002/03/042).

Record type: Article

Abstract

We evaluate the relic density of neutralinos in the minimal supergravity (mSUGRA) model. All 2?2 neutralino annihilation diagrams, as well as all processes involving sleptons, charginos, neutralinos and third generation squarks are included. Relativistic thermal averaging of the velocity times cross sections is performed. We find that co-annihilation effects are only important on the edges of the model parameter space, where some amount of fine-tuning is necessary to obtain a reasonable relic density. Alternatively, at high tan ?, annihilation through very broad Higgs resonances gives rise to an acceptable neutralino relic density over broad regions of parameter space where little or no fine-tuning is needed. Finally, we compare our results against the reach of various e+e? and hadron colliders for supersymmetric matter.

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More information

Published date: 22 April 2002
Additional Information: We evaluate the relic density of neutralinos in the minimal supergravity model including all neutralino annihilation and co-annihilation processes, classifying for the first time the regions of the mSUGRA parameter space with acceptable relic density. The ISARED public code for neurtralino relic density evaluation has been created.
Keywords: dark matter, supersymmetric standard model
Organisations: Physics & Astronomy

Identifiers

Local EPrints ID: 46738
URI: http://eprints.soton.ac.uk/id/eprint/46738
PURE UUID: d943b9d9-7417-4040-8733-c0969fa874af
ORCID for Alexander Belyaev: ORCID iD orcid.org/0000-0002-1733-4408

Catalogue record

Date deposited: 17 Jul 2007
Last modified: 10 Dec 2019 01:42

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