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Title: Spectator effects during Leptogenesis in the strong washout regime

By including spectator fields into the Boltzmann equations for Leptogenesis, we show that partially equilibrated spectator interactions can have a significant impact on the freeze-out value of the asymmetry in the strong washout regime. The final asymmetry is typically increased, since partially equilibrated spectators ''hide'' a part of the asymmetry from washout. We study examples with leptonic and non-leptonic spectator processes, assuming thermal initial conditions, and find up to 50% enhanced asymmetries compared to the limit of fully equilibrated spectators. Together with a comprehensive overview of the equilibration temperatures for various Standard Model processes, the numerical results indicate the ranges when the limiting cases of either fully equilibrated or negligible spectator fields are applicable and when they are not. Our findings also indicate an increased sensitivity to initial conditions and finite density corrections even in the strong washout regime.
Authors:
 [1] ;  [2]
  1. Physik Department T70, Technische Universität München, James-Franck-Straße, 85748 Garching (Germany)
  2. CERN, Theory Division, CH-1211 Geneva 23 (Switzerland)
Publication Date:
OSTI Identifier:
22375841
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2014; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASYMMETRY; BOLTZMANN EQUATION; CORRECTIONS; FREEZING OUT; INTERACTIONS; PARTICLE PRODUCTION; SENSITIVITY; STANDARD MODEL