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arXiv · 1910.12880

A thermal neutrino interaction rate at NLO

G. Jackson·M. Laine
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Abstract

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 $\pi T \gg m_W$, finding a $\sim 15 ... 40\%$ reduction. For a benchmark point, this NLO correction decreases the lepton asymmetries produced by $\sim 1\%$.

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G. Jackson, M. Laine. 2019-10-28. A thermal neutrino interaction rate at NLO. https://doi.org/10.1016/j.nuclphysb.2019.114870

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