期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 12, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2014/12/032
关键词
leptogenesis; baryon asymmetry; neutrino theory
资金
- Swiss National Science Foundation (SNF) [200020-155935]
- Swiss National Science Foundation (SNF) [200020_155935] Funding Source: Swiss National Science Foundation (SNF)
The production rate of right-handed neutrinos from a Standard Model plasma at a temperature above a hundred GeV has previously been evaluated up to NLO in Standard Model couplings (g similar to 2/3) in relativistic (M similar to pi T) and non-relativistic regimes (M >> pi T), and up to LO in an ultrarelativistic regime (M less than or similar to gT). The last result necessitates an all-orders resummation of the loop expansion, accounting for multiple soft scatterings of the nearly light-like particles participating in 1 <-> 2 reactions. In this paper we suggest how the regimes can be interpolated into a result applicable for any right-handed neutrino mass and at all temperatures above 160GeV. The results can also be used for determining the lepton number washout rate in models containing right-handed neutrinos. Numerical results are given in a tabulated form permitting for their incorporation into leptogenesis codes. We note that due to effects from soft Higgs bosons there is a narrow intermediate regime around M similar to g(1/2)T in which our interpolation is phenomenological and a more precise study would be welcome.
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