Neutralino Relic Density including Coannihilations

Details Neutralino Relic Density including Coannihilations Neutralino Relic Density including Coannihilations

1997-04-20

arxiv.org/abs/hep-ph/9704361v2

Phys.Rev.D56:1879-1894,1997

Physics

High Energy Physics

High Energy Physics - Phenomenology

LaTeX, 14 embedded eps figures, uses epsfig. For paper with full resolution figures, see http://www.teorfys.uu.se/~edsjo/Welco

Scientific paper

10.1103/PhysRevD.56.1879

We evaluate the relic density of the lightest neutralino, the lightest supersymmetric particle, in the Minimal Supersymmetric extension of the Standard Model (MSSM). For the first time, we include all coannihilation processes between neutralinos and charginos for any neutralino mass and composition. We use the most sophisticated routines for integrating the cross sections and the Boltzmann equation. We properly treat (sub)threshold and resonant annihilations. We also include one-loop corrections to neutralino masses. We find that coannihilation processes are important not only for light higgsino-like neutralinos, as pointed out before, but also for heavy higgsinos and for mixed and gaugino-like neutralinos. Indeed, coannihilations should be included whenever $|\mu| \lsim 2 |M_1|$, independently of the neutralino composition. When $|\mu| \sim |M_1|$, coannihilations can increase or decrease the relic density in and out of the cosmologically interesting region. We find that there is still a window of light higgsino-like neutralinos that are viable dark matter candidates and that coannihilations shift the cosmological upper bound on the neutralino mass from 3 to 7 TeV.

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