Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-12-17
JCAP 1103:042,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
26 pages, 8 figures; added references, added comments on 2 to 2 scattering processes, improved appearance of fig. 8, corrected
Scientific paper
10.1088/1475-7516/2011/03/042
The production rate of heavy Majorana neutrinos is relevant for models of thermal leptogenesis in the early Universe. In the high temperature limit the production can proceed via the 1 <-> 2 (inverse) decays which are allowed by the thermal masses. We consider new production mechanisms which are obtained by including additional soft gauge interactions with the plasma. We show that an arbitrary number of such interactions gives leading order contributions, and we sum all of them. The rate turns out to be smooth in the region where the 1 <-> 2 processes are kinematically forbidden. At higher temperature it is enhanced by a factor 3 compared to the 1 <-> 2 rate.
Anisimov Alexey
Besak Denis
Bodeker Dietrich
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