Sneutrino Leptogenesis at the Electroweak Scale
High Energy Physics - Phenomenology
2007-05-23 v1
Abstract
We propose an alternative mechanism for leptogenesis at the electroweak scale, through the decays of a left-handed sneutrino. This scenario may be realized in supersymmetric models with non-zero Majorana masses for the neutrino superfield that lead to mixing and mass splitting between the left-handed sneutrino and the corresponding antisneutrino. Soft supersymmetry breaking provides new sources of CP violation in sneutrino-antisneutrino mixing that can generate a lepton asymmetry in decays of the left-handed sneutrino. We show how the three Sakharov conditions for generating the observed baryon asymmetry of the Universe can be fulfilled in this restrictive framework.
Cite
@article{arxiv.hep-ph/0505162,
title = {Sneutrino Leptogenesis at the Electroweak Scale},
author = {John Ellis and Sin Kyu Kang},
journal= {arXiv preprint arXiv:hep-ph/0505162},
year = {2007}
}
Comments
13 pages, 2 figures