RETRACTED: Dirac leptogenesis via scatterings

Physical review. D/Physical review. D., vol. 108

Abstract

Leptogenesis typically requires the introduction of heavy particles whose out-of-equilibrium decays are essential for generating a matter-antimatter asymmetry, according to one of Sakharov's conditions. We show that, in Dirac leptogenesis, scatterings between the light degrees of freedom---Standard Model particles plus Dirac neutrinos---suffice to generate the asymmetry. Sakharov's conditions are satisfied because the right-handed neutrino partners are out of equilibrium. Consequently, heavy degrees of freedom never needed to be produced in the early Universe, allowing for a reheating temperature below their mass scale. We solve the Boltzmann equations and discuss the viable parameter space together with observational signatures such as an increased number of effective neutrinos in the early Universe as well as proton decay for some realizations.

Authors 3

1. Julian Heeck

   University of Virginia

   Affiliation as printed

   Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714, USA

2. Jan Heisig Aachen Institute for Theoretical Particle Physics and Cosmology

   RWTH Aachen University · University of Virginia

   Affiliation as printed

   Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714, USA

   Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen University, D-52056 Aachen, Germany

3. Anil Thapa

   University of Virginia

   Affiliation as printed

   Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714, USA