Non-relativistic pair annihilation of nearly mass degenerate neutralinos and charginos II. P-wave and next-to-next-to-leading order S-wave coefficients

摘要

This paper is a continuation of an earlier work (arXiv:1210.7928) whichcomputed analytically the tree-level annihilation rates of a collection ofnon-relativistic neutralino and chargino two-particle states in the generalMSSM. Here we extend the results by providing the next-to-next-to-leading ordercorrections to the rates in the non-relativistic expansion in momenta and massdifferences, which include leading P-wave effects, in analytic form. Theresults are a necessary input for the calculation of the Sommerfeld-enhanceddark matter annihilation rates including short-distance corrections atnext-to-next-to-leading order in the non-relativistic expansion in the generalMSSM with neutralino LSP.