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Title: Thermal production of ultrarelativistic right-handed neutrinos: complete leading-order results

Abstract

The thermal production of relativistic right-handed Majorana neutrinos is of importance for models of thermal leptogenesis in the early Universe. Right-handed neutrinos can be produced both by 1↔2 decay or inverse decay and by 2 → 2 scattering processes. In a previous publication we have studied the production via 1↔2 (inverse) decay processes. There we have shown that multiple scattering mediated by soft gauge boson exchange also contributes to the production rate at leading order and gives a strong enhancement. Here we complete the leading order calculation by adding 2 → 2 scattering processes involving either electroweak gauge bosons or third-generation quarks. We find that processes with gauge interactions give the most important contributions. We also obtain a new sum rule for the Hard Thermal Loop resummed fermion propagator.

Authors:
;  [1]
  1. Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld (Germany)
Publication Date:
OSTI Identifier:
22279764
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 03; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BOSON-EXCHANGE MODELS; BOSONS; COSMOLOGICAL MODELS; GAUGE INVARIANCE; MULTIPLE SCATTERING; NEUTRINOS; PARTICLE PRODUCTION; PROPAGATOR; QUARKS; RELATIVISTIC RANGE; SUM RULES; UNIVERSE

Citation Formats

Besak, Denis, and Bödeker, Dietrich. Thermal production of ultrarelativistic right-handed neutrinos: complete leading-order results. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/03/029.
Besak, Denis, & Bödeker, Dietrich. Thermal production of ultrarelativistic right-handed neutrinos: complete leading-order results. United States. doi:10.1088/1475-7516/2012/03/029.
Besak, Denis, and Bödeker, Dietrich. Thu . "Thermal production of ultrarelativistic right-handed neutrinos: complete leading-order results". United States. doi:10.1088/1475-7516/2012/03/029.
@article{osti_22279764,
title = {Thermal production of ultrarelativistic right-handed neutrinos: complete leading-order results},
author = {Besak, Denis and Bödeker, Dietrich},
abstractNote = {The thermal production of relativistic right-handed Majorana neutrinos is of importance for models of thermal leptogenesis in the early Universe. Right-handed neutrinos can be produced both by 1↔2 decay or inverse decay and by 2 → 2 scattering processes. In a previous publication we have studied the production via 1↔2 (inverse) decay processes. There we have shown that multiple scattering mediated by soft gauge boson exchange also contributes to the production rate at leading order and gives a strong enhancement. Here we complete the leading order calculation by adding 2 → 2 scattering processes involving either electroweak gauge bosons or third-generation quarks. We find that processes with gauge interactions give the most important contributions. We also obtain a new sum rule for the Hard Thermal Loop resummed fermion propagator.},
doi = {10.1088/1475-7516/2012/03/029},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 03,
volume = 2012,
place = {United States},
year = {2012},
month = {3}
}