CERN Accelerating science

Preprint
Report number	hep-ph/0505162 ; CERN-PH-TH-2005-077 ; SNUTP-05-005 ; CERN-PH-TH-2005-077 ; SNUTP-2005-005
Title	Sneutrino Leptogenesis at the Electroweak Scale
Author(s)	Ellis, John R. (CERN) ; Kang, Sin Kyu (Seoul Natl. U.)
Affiliation	(CERN)
Publication	2005
Imprint	18 May 2005
Number of pages	13
Subject category	Particle Physics - Phenomenology
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.
Other source	Inspire