CERN Accelerating science

Article
Report number	hep-ph/9809209
Title	Electroweak Baryon Number Violation and Constraints on Left-handed Majorana Neutrino Masses
Author(s)	Sarkar, U (Ahmedabad, Phys. Res. Lab)
Publication	1999
Imprint	2 Sep 1998
Number of pages	20
In:	1st International Symposium on Lepton and Baryon Number Violation, Trento, Italy, 20 - 25 Apr 1998, pp.361-380
Subject category	Particle Physics - Phenomenology
Abstract	During a large period of time, the anomalous baryon number violating interactions are in equilibrium, when the $(B+L)$ asymmetry is washed out. If there is any lepton number violation during this period, that will also erase the $(B-L)$ asymmetry. As a result, survival of the baryon asymmetry of the universe pose strong constraints on lepton number violating interactions. We review here the constraints on the left-handed Majorana neutrino masses arising from this survival requirement of the baryon asymmetry of the universe. We then briefly review models of leptogenesis, where lepton number violation is used to generate a baryon asymmetry of the universe and hence the constraints on the Majorana neutrino mass is relaxed.

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