Fermion Masses from Six Dimensions and Implications for Majorana Neutrinos

IWTCP-2; NCTP-39

Frère, J.-M.^1 ; Libanov, M.^2 ; Mollet, S.^1 ; Troitsky, S.^2

Physique Théorique, Université Libre de Bruxelles, CP 225, Bruxelles

B-1050, Belgium^1

Institute for Nuclear Research of the Russian Academy of Sciences, 60th October Anniversary Prospect 7a, Moscow

117312, Russia^2

关键词: Actual measurements;    Large mixing angles;    Localized wave functions;    Lower limits;    Majorana neutrino;    Mass matrices;    Mixing angle;    Neutrinoless double-beta decays;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/627/1/012001/pdf
DOI  :  10.1088/1742-6596/627/1/012001

来源: IOP

【 摘 要 】

In these notes, we review the main results of our approach to fermion masses. The marge mass ratios between fermions, confronted with a unique breaking mechanism leading to vector bosons masses, led us to consider the possibility that they result from the overlap of fermion wave functions. Such overlaps vary indeed very strongly if the observed fermion families in 4 dimensions originate in a single family in 6 dimensions, through localized wave functions. This framework leads in a natural way to large mass ratios and small mixing angles between quarks. What came as a surprise is that if we impose that neutrinos behave as 2- component ("Majorana") particles in 4D, a completely different situation is obtained for them. Instead of diagonal mass matrices, anti-diagonal ones emerge and lead to a generic prediction of combined inverted hierarchy, large mixing angles in the leptonicsector, and a suppression of neutrinoless-double beta decay placing it at the lower limit of the inverted hierarchy branch, a challenging situation for on-going and planned experiments. Our approach predicted the size of the θ13mixing angle before its actual measurement. Possible signals at colliders are only briefly evoked.