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

B. Machet
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Abstract

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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B. Machet. 1996-06-12. Leptonic Custodial Symmetry, Quantization of the Electric Charge and the Neutrino in the Standard Model. https://doi.org/10.1142/s0217732396002289

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