A full thermal-resummation computation shows that plasmon and plasmino corrections leave the TeV-scale singlet scalar annihilation cross section essentially unchanged, reconfirming existing relic density constraints.
Towards leptogenesis at NLO: the right-handed neutrino interaction rate
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abstract
We compute quantum and thermal corrections to the right-handed neutrino interaction rate in the early universe at next-to-leading order in all the relevant SM couplings (gauge, top Yukawa and higgs couplings). Previous computations considered 2 -> 2 scatterings, finding infra-red divergences. The KLN theorem demands that infra-red divergences cancel in the full result: after adding 1 -> 3 and one-loop virtual corrections that enter at the same order we find a simple result.
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Computing singlet scalar freeze-out with plasmon and plasmino states
A full thermal-resummation computation shows that plasmon and plasmino corrections leave the TeV-scale singlet scalar annihilation cross section essentially unchanged, reconfirming existing relic density constraints.