Studies of a thermally averaged p-wave Sommerfeld factor

Abstract

Thermal pair annihilation of heavy particles, such as dark matter or its co-annihilation partners, can be strongly influenced by attractive interactions. We investigate the case that pair annihilation proceeds through a velocity-suppressed $p$-wave operator, in the presence of an SU(3) gauge force. Making use of a non-relativistic effective theory, the thermal average of the pair-annihilation rate is estimated both through a resummed perturbative computation and through lattice simulation, in the range $M/T\sim \mathrm{10...30}$. Bound states contribute to the annihilation process and enhancement factors of up to $\sim 100$ can be found.

15 pages

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Cited by in corpus (1)

• Bound-state formation, dissociation and decays of darkonium with potential non-relativistic Yukawa theory for scalar and pseudoscalar mediators