Annihilation Cross Sections for Relic Densities in the Low Velocity Limit

Details Annihilation Cross Sections for Relic Densities in the Low Velocity Limit Annihilation Cross Sections for Relic Densities in the Low Velocity Limit

1994-04-06

arxiv.org/abs/hep-ph/9404219v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages (LATEX), UM-TH-94-10

Scientific paper

A simple method to calculate the total annihilation cross section of massive cold relics is presented. Exact expressions for $\arel$, $\brel$, and $\crel$ of $\sigma \vrel=\arel+\brel \vrel^2+\crel \vrel^4$ are obtained from simple derivatives of the squared annihilation amplitude. Three examples are given. In one example, the computed annihilation cross section of massive Dirac neutrinos confirms recent correct calculations.

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