Large leptonic Dirac CP phase from broken democracy with random perturbations
- Univ. of Tokyo, Kashiwa (Japan). Kavli IPMU (WPI). UTIAS; Univ. of California, Berkeley, CA (United States). Dept. of Physics
- Univ. of Tokyo, Kashiwa (Japan). Kavli IPMU (WPI). UTIAS; Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
- Univ. of Tokyo, Kashiwa (Japan). Kavli IPMU (WPI). UTIAS
A large value of the leptonic Dirac CP phase can arise from broken democracy, where the mass matrices are democratic up to small random perturbations. Such perturbations are a natural consequence of broken residual symmetries that dictate the democratic mass matrices at leading order. With random perturbations, the leptonic Dirac CP phase has a higher probability to attain a value around . Comparing with the anarchy model, broken democracy can benefit from residual symmetries, and it can produce much better, realistic predictions for the mass hierarchy, mixing angles, and Dirac CP phase in both quark and lepton sectors. Our approach provides a general framework for a class of models in which a residual symmetry determines the general features at leading order, and where, in the absence of other fundamental principles, the symmetry breaking appears in the form of random perturbations.
- Research Organization:
- Univ. of California, Los Angeles, CA (United States); Univ. of Tokyo, Kashiwa (Japan)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); Ministry of Education, Culture, Sports, Science and Technology (MEXT) (Japan); Japan Society for the Promotion of Science (JSPS)
- Grant/Contract Number:
- SC0009937; JP18K13536; 26104001; 26104009; 16H02176; 17H02878
- OSTI ID:
- 1434567
- Alternate ID(s):
- OSTI ID: 1499171
- Journal Information:
- Physics Letters. B, Vol. 781; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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