Neutralino relic density in minimal supergravity with co-annihilations

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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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

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