Please use this identifier to cite or link to this item:
Title: Covert symmetries in the neutrino mass matrix
Author: Björkeroth, Fredrik
Di Luzio, Luca
Mescia, Federico
Nardi, Enrico
Keywords: Física de partícules
Simetria (Física)
Particle physics
Symmetry (Physics)
Issue Date: 11-Feb-2020
Publisher: Springer Verlag
Abstract: The flavour neutrino puzzle is often addressed by considering neutrino mass matrices m with a certain number of vanishing entries (mij = 0 for some values of the indices), since a reduction in the number of free parameters increases the predictive power. Symmetries that can enforce textures zero can also enforce a more general type of conditions f(mij) = 0 with f some function of the matrix elements mij. In this case m can have all entries non-vanishing with no reduction in its predictive power. We classify all generation-dependent U(1) symmetries which, in the presence of two leptonic Higgs doublets, can reduce the number of independent high-energy parameters of type-I seesaw to the minimum number compatible with non-vanishing neutrino mixings and CP violation. These symmetries are broken above the scale where the effective operator is generated and can thus remain covert, in the sense that no explicit evidence of the symmetry can be read off the neutrino mass matrix, and different symmetries can give rise to the same low-energy structure. We find that only two cases are viable: one yields a structure with two zero-textures already considered in the literature, the other has no zero-textures and has never been considered before. It predicts normal ordering, a lightest neutrino mass ∼ 10 meV, a Dirac phase δ ∼ 3π2 and definite values for the Majorana phases.
Note: Reproducció del document publicat a:
It is part of: Journal of High Energy Physics, 2020, num. 66
Related resource:
ISSN: 1126-6708
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

Files in This Item:
File Description SizeFormat 
696373.pdf444.07 kBAdobe PDFView/Open

This item is licensed under a Creative Commons License Creative Commons