Neutrino decay into fermionic quasiparticles in leptogenesis

Details Neutrino decay into fermionic quasiparticles in leptogenesis Neutrino decay into fermionic quasiparticles in leptogenesis

2010-04-22

arxiv.org/abs/1004.3999v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 3 figures, proceedings of "Beyond the standard models of particle physics, cosmology and astrophysics", Cape Town, Fe

Scientific paper

We calculate the decay rate of the lightest heavy Majorana neutrino in a thermal bath using finite temperature cutting rules and effective Green's functions according to the hard thermal loop resummation technique. Compared to the usual approach where thermal masses are inserted into the kinematics of final states, we find that deviations arise through two different leptonic dispersion relations. The decay rate differs from the usual approach by more than one order of magnitude in the temperature range which is interesting for the weak washout regime. This work summarizes the results of Ref. [1], to which we refer the interested reader.

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