Phased breaking of {mu}-{tau} symmetry and leptogenesis
- Department of Physics, Yonsei University, Seoul 120-749 (Korea, Republic of)
- Center for Quantum Spacetime, Sogang University, Seoul 121-742 (Korea, Republic of)
Nonvanishing U{sub e3} has been theoretically related to a certain flavor symmetry breaking in the neutrino sector. We propose a scenario to break the {mu}-{tau} symmetry so as to accommodate the nonvanishing U{sub e3}. Our scenario is constructed in the context of a seesaw model, and the {mu}-{tau} symmetry breaking is achieved by introducing a CP phase in the Dirac Yukawa matrix. We also show how the deviation of {theta}{sub 23} from the maximal mixing and nonvanishing U{sub e3} depend on the CP phase. Neutrino mixings and the neutrino mass-squared differences are discussed, and the amplitude in neutrinoless double beta decay m{sub ee} are also predicted. We found that a tiny breaking of the {mu}-{tau} symmetry due to mass splitting between two degenerate heavy Majorana neutrinos on top of the Dirac CP phase can lead to successful leptogenesis. We examine how leptogenesis can be related with low energy neutrino measurement, and show that our predictions for U{sub e3} and m{sub ee} can be constrained by the current observation of baryon asymmetry.
- OSTI ID:
- 20782971
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 73, Issue 9; Other Information: DOI: 10.1103/PhysRevD.73.093005; (c) 2006 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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