A thermal neutrino interaction rate at NLO

G. Jackson & M. Laine
The interaction rate of an ultrarelativistic active neutrino at a temperature below the electroweak crossover plays a role in leptogenesis scenarios based on oscillations between active neutrinos and GeV-scale sterile neutrinos. By making use of a Euclideanization property of a thermal light-cone correlator, we determine the O(g)correction to such an interaction rate in the high-temperature limit πT>>mW, finding a ∼15...40%reduction. For a benchmark point, this NLO correction decreases the lepton asymmetries produced by ∼1%.
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