SU(3)Fgauge family model and new symmetry breaking scale from FCNC processes

Abstract

Based on the SU (3) F gauge family symmetry model which was proposed to explain the observed mass and mixing pattern of neutrinos, we investigate the symmetry breaking, the mixing pattern in quark and lepton sectors, and the contribution of the new gauge bosons to some flavour changing neutral currents (FCNC) processes at low energy. With the current data of the mass differences in the neutral pseudo-scalar P 0 −P 0 systems, we find that the SU (3) F symmetry breaking scale can be as low as 300TeV and the mass of the lightest gauge boson be about 100TeV. Other FCNC processes, such as the lepton flavour number violation process µ − → e − e + e − and the semi-leptonic rare decay K → πνν, contain contributions via the new gauge bosons exchanging. With the constrains got from P 0 −P 0 system, we estimate that the contribution of the new physics is around 10 −16 , far below the current experimental bounds.

Lepton flavor violation and neutrino masses from A5 and CP in the non-universal MSSM

“…Nevertheless, if flavor dependent new physics is close to the electroweak scale, as naturally expected in most of the extensions of the SM, it will provide additional information on flavor dynamics helping us to inspect the mechanism responsible for neutrino masses and to determine the parameters of the model. One example of this, which has been explored in previous works [13][14][15][16][17][18][19] but we do not consider here, supposes that the flavor symmetry is broken around the electroweak scale. In that case, the scalar flavons may mediate lepton flavor violating (LFV) processes in a measurable way while the fields themselves could be produced and detected in future colliders.…”