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Title: Large leptonic Dirac CP phase from broken democracy with random perturbations

Journal Article · · Physics Letters. B
ORCiD logo [1];  [2];  [3]
  1. Univ. of Tokyo, Kashiwa (Japan). Kavli IPMU (WPI). UTIAS; Univ. of California, Berkeley, CA (United States). Dept. of Physics
  2. Univ. of Tokyo, Kashiwa (Japan). Kavli IPMU (WPI). UTIAS; Univ. of California, Los Angeles, CA (United States). Dept. of Physics and Astronomy
  3. 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 S 3 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 ±π/2 . Comparing with the anarchy model, broken democracy can benefit from residual S 3 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
Citation Metrics:
Cited by: 8 works
Citation information provided by
Web of Science

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Cited By (5)

A comparative study between the modified Fritzsch and nearest neighbor interaction textures journal November 2019
A comparative study between the modified Fritzsch and nearest neighbor interaction textures text January 2019
Flavored non-minimal left–right symmetric model fermion masses and mixings journal October 2018
A comparative study between the modified Fritzsch and nearest neighbor interaction textures text January 2019
Flavored multiscalar $\mathbf{S}_{3}$ model with normal hierarchy neutrino mass preprint January 2020

Figures / Tables (5)


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