Relic density of neutralinos in minimal supergravity

Details Relic density of neutralinos in minimal supergravity Relic density of neutralinos in minimal supergravity

2002-11-14

arxiv.org/abs/hep-ph/0211213v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 10 pages. Talk given by Alexander Belyaev at SUSY'02, "The 10th International Conference on Supersymmetry and Unificati

Scientific paper

We evaluate the relic density of neutralinos in the minimal supergravity (mSUGRA) model. All 2->2 neutralino annihilation diagrams, as well as all initial states 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(beta), annihilation through the 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.

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