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Leptogenesis and μ - τ symmetry

Leptogenesis and μ - τ symmetry If an exact μ ↔ τ symmetry is the explanation of the maximal atmospheric neutrino mixing angle, it has interesting implications for the origin of matter via leptogenesis in models where small neutrino masses arise via the seesaw mechanism. For seesaw models with two right-handed neutrinos ( N μ , N τ ) , lepton asymmetry vanishes in the exact μ ↔ τ symmetric limit, even though there are nonvanishing Majorana phases in the neutrino mixing matrix. On the other hand, for three right-handed neutrino models, lepton asymmetry is nonzero and is given directly by the solar mass difference square. We also find an upper bound on the lightest neutrino mass. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Leptogenesis and μ - τ symmetry

Physical Review D , Volume 71 (3) – Feb 1, 2005
5 pages

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References (7)

Publisher
American Physical Society (APS)
Copyright
Copyright © 2005 The American Physical Society
ISSN
1550-2368
DOI
10.1103/PhysRevD.71.033001
Publisher site
See Article on Publisher Site

Abstract

If an exact μ ↔ τ symmetry is the explanation of the maximal atmospheric neutrino mixing angle, it has interesting implications for the origin of matter via leptogenesis in models where small neutrino masses arise via the seesaw mechanism. For seesaw models with two right-handed neutrinos ( N μ , N τ ) , lepton asymmetry vanishes in the exact μ ↔ τ symmetric limit, even though there are nonvanishing Majorana phases in the neutrino mixing matrix. On the other hand, for three right-handed neutrino models, lepton asymmetry is nonzero and is given directly by the solar mass difference square. We also find an upper bound on the lightest neutrino mass.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Feb 1, 2005

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