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Title: Right-handed neutrino production rate at T > 160 GeV

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 ∼ 2/3) in relativistic (M ∼ πT) and non-relativistic regimes (M >> πT), and up to LO in an ultrarelativistic regime (M ∼< 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 ∼ g{sup 1/2}T in which our interpolation is phenomenological and a more precise study would be welcome.
Authors:
 [1] ;  [2]
  1. Department of Physics and Helsinki Institute of Physics, University of Helsinki, P.O.Box 64, FI-00014 Helsinki (Finland)
  2. Institute for Theoretical Physics, Albert Einstein Center, University of Bern, Sidlerstrasse 5, CH-3012 Bern (Switzerland)
Publication Date:
OSTI Identifier:
22382064
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 12; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; EXPANSION; GEV RANGE 100-1000; HIGGS BOSONS; INTERPOLATION; LEPTON NUMBER; MASS; NEUTRINOS; PARTICLE PRODUCTION; PLASMA; RELATIVISTIC RANGE; SCATTERING; STANDARD MODEL