2-3 symmetry: Flavor changing b, {tau} decays, and neutrino mixing
- Department of Physics, University of Toronto, 60 St. George Street, Toronto, ON, M5S 1A7 (Canada)
The observed pattern of neutrino mixing may be the result of a 2-3({mu}-{tau}) symmetry in the leptonic sector. We consider a two Higgs doublet model with a 2-3 symmetry in the down-type quark and the charged lepton sector. The breaking of the 2-3 symmetry by the strange quark mass and the muon mass leads to flavor changing neutral currents in the quark sector and the charged lepton sector that are suppressed by m{sub s}/m{sub b} and m{sub {mu}}/m{sub {tau}} in addition to the mass of the heavy Higgs boson of the second Higgs doublet. A Higgs boson mass of m{sub H}{approx}600-900 GeV can explain the deviation from the standard model reported in several rare B decays. Predictions for other B decays are made, and a new CP phase is predicted in B{sub s}-B{sub s} mixing. The lepton flavor violating decays {tau}{yields}{mu}l(q)l(q) are below the experimental limits. The breaking of 2-3 symmetry in the lepton sector can lead to deviations of the atmospheric neutrino mixing angle from the maximal value by {approx}2 degrees.
- OSTI ID:
- 20774418
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 72, Issue 11; Other Information: DOI: 10.1103/PhysRevD.72.113002; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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