Leptonic Custodial Symmetry, Quantization of the Electric Charge and the Neutrino in the Standard Model

Details Leptonic Custodial Symmetry, Quantization of the Electric Charge and the Neutrino in the Standard Model Leptonic Custodial Symmetry, Quantization of the Electric Charge and the Neutrino in the Standard Model

1996-06-12

arxiv.org/abs/hep-ph/9606308v1

Mod.Phys.Lett. A11 (1996) 2297-2308

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, Latex

Scientific paper

I study, in the leptonic sector, the role of the $SU(2)_V$ custodial symmetry $\ti{\cal G}$ which was shown in ref. [1] to control the quantization of the electric charge in the $J=0$ mesonic sector. The electroweak theory is considered, according to ref. [2], as a purely vectorial model which interacts with a ``hidden'' sector of composite scalars. $\ti{\cal G}$ can only be a symmetry of the former if the neutrino is a Majorana particle; the latter provides a dynamical modification of the leptonic weak couplings, reconstructing those of the Standard Model with a massless Majorana neutrino.

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