Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-02-08
JHEP 0203 (2002) 042
Physics
High Energy Physics
High Energy Physics - Phenomenology
JHEP LaTex, 19 pages, 12 figures
Scientific paper
10.1088/1126-6708/2002/03/042
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(beta), 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.
Baer Howard
Balazs Csaba
Belyaev Alexander
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