https://doi.org/10.1140/epjc/s10052-021-09741-1
Regular Article - Theoretical Physics
Implications of the Muon g-2 result on the flavour structure of the lepton mass matrix
1
School of Physics, Nankai University, 300071, Tianjin, China
2
CAS Key Laboratory of Theoretical Physics, Institute of Theoretical Physics, Chinese Academy of Sciences, 100190, Beijing, China
3
Departamento de Física, Universidad de Córdoba, Campus de Rabanales Edif. C2, 14071, Córdoba, Spain
4
Laboratory of High Energy and Computational Physics, NICPB, Rävala 10, 10143, Tallinn, Estonia
5
Departament de Física Tèorica, Universitat de València, Dr. Moliner 50, 46100, Burjassot, Spain
6
IFIC, Universitat de València-CSIC, 46071, Paterna, Spain
Received:
26
July
2021
Accepted:
11
October
2021
Published online:
21
October
2021
The confirmation of the discrepancy with the Standard Model predictions in the anomalous magnetic moment by the Muon g-2 experiment at Fermilab points to a low scale of new physics. Flavour symmetries broken at low energies can account for this discrepancy but these models are much more restricted, as they would also generate off-diagonal entries in the dipole moment matrix. Therefore, if we assume that the observed discrepancy in the muon 
is explained by the contributions of a low-energy flavor symmetry, lepton flavour violating processes can constrain the structure of the lepton mass matrices and therefore the flavour symmetries themselves predicting these structures. We apply these ideas to several discrete flavour symmetries popular in the leptonic sector, such as 
, 
, and 
.
© The Author(s) 2021
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