2021 Impact factor 4.991
Particles and Fields
Eur. Phys. J. C 7, 543-549
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.


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