Baryon and lepton numbers in two scenarios of leptogenesis

Details Baryon and lepton numbers in two scenarios of leptogenesis Baryon and lepton numbers in two scenarios of leptogenesis

2005-11-06

arxiv.org/abs/hep-ph/0511059v2

Phys.Rev. D73 (2006) 023514

Physics

High Energy Physics

High Energy Physics - Phenomenology

9 pages, 4 figures

Scientific paper

10.1088/0031-8949/2006/T127/033

Baryon and lepton numbers of the Universe in leptogenesis with Dirac neutrino and leptogenesis with Majorana neutrino scenarios are considered. It is shown that despite quite different features of Dirac and Majorana fermions both scenarios yield the same relation among the initial lepton and the final baryon asymmetries. Moreover right-handed neutrinos in the leptogenesis with Dirac neutrino scenario have very little impact on the effective number of relativistic degrees of freedom, constrained by BBN. Thus the two scenarios are similar from the cosmological point of view. It is also pointed out that in thermal equilibrium the 3B+L sum is zero for left-handed fermions.

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