DOI 10.1007/s100529801020
Scale of leptogenesis
J. Faridani1 - S. Lola2 - P.J. O'Donnell3 - U. Sarkar4
1 Department of Statistics and Actuarial Science,
University of Waterloo,
Waterloo, Ont. N2L 3G1, Canada
2 Theory Division, CERN, CH-1211 Geneva, Switzerland
3 Physics Department, University of Toronto, Toronto, Ontario M5S 1A7,
Canada
4 Theory Group, Physical Research Laboratory,
Ahmedabad, 380 009, India
Received: 14 April 1998 / Revised version: 8 August 1998 / Published online: 11 February 1999
Abstract
We study the scale at which one can generate the lepton asymmetry
of the universe which could then get converted to a baryon
asymmetry during the electroweak phase transition. We consider
the possibility that the Yukawa couplings could be arbitrarily
small but sufficiently large to generate enough lepton asymmetry.
This forbids the possibility of the (B-L) breaking scale to be
less than 10 TeV.
Copyright Springer-Verlag
