Constraints on neutrino masses from leptogenesis models

Physics – High Energy Physics – High Energy Physics - Phenomenology

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

16 pages, 6 figures

Scientific paper

10.1016/j.nuclphysb.2004.06.027

Upper bounds on the CP asymmetry relevant for leptogenesis are reexamined and found weaker than in previous literature, both for hierarchical and for quasi-degenerate right-handed neutrinos. Successful leptogenesis implies the usual lower bound on right-handed neutrino masses, and an upper bound on left-handed neutrino masses (which we obtain to be 0.15eV at 3sigma) only if right-handed neutrinos are assumed to be much more hierarchical than left-handed neutrinos. Otherwise both bounds can be considerably relaxed. The constraint on light neutrino masses varies assuming different interpretations of why neutrinos should be quasi-degenerate. With conservative assumptions, we find that a mild quasi-degeneracy allows neutrinos heavier than an eV compatibly with leptogenesis. We also extend computations of thermal leptogenesis to an alternative model of neutrino mass mediated by fermion triplets which was never considered so far for leptogenesis. Leptogenesis can be successful despite the effect of gauge interactions, resulting in only slightly stronger constraints on neutrino masses.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

Constraints on neutrino masses from leptogenesis models does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Constraints on neutrino masses from leptogenesis models, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Constraints on neutrino masses from leptogenesis models will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-511109

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.