Radiative bound state formation cross sections for dark matter interacting via a Yukawa potential
A bstractWe calculate the cross sections for the radiative formation of bound states by dark matter whose interactions are described in the non relativistic regime by a Yukawa potential. These cross sections are important for cosmological and phenomenological studies of dark matter with long range interactions, residing in a hidden sector, as well as for TeV scale WIMP dark matter. We provide the leading order contributions to the cross sections for the dominant capture processes occurring via emission of a vector or a scalar boson. We offer a detailed inspection of their features, including their velocity dependence within and outside the Coulomb regime, and their resonance structure. For pairs of annihilating particles, we compare bound state formation with annihilation.