Leptogenesis and {mu}-{tau} symmetry

Journal Article · Tue Feb 01 00:00:00 EST 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.033001· OSTI ID:20705913

Mohapatra, R N; Nasri, S ^[1]

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1. Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)

If an exact {mu}{r_reversible}{tau} 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{sub {mu}},N{sub {tau}}), lepton asymmetry vanishes in the exact {mu}{r_reversible}{tau} 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.

• OSTI ID: 20705913
• Journal Information: Physical Review. D, Particles Fields, Vol. 71, Issue 3; Other Information: DOI: 10.1103/PhysRevD.71.033001; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ASYMMETRY
MASS DIFFERENCE
MUON NEUTRINOS
STANDARD MODEL
SYMMETRY
TAU NEUTRINOS
WEINBERG ANGLE