Flavoured $B−L$ local symmetry and anomalous rare $B$ decays

By R. Alonso, P. Cox, C. Han, T. Yanagida. 2017

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Abstract We consider a flavoured B − L gauge symmetry under which only the third generation fermions are charged. Such a symmetry can survive at low energies ( ∼ TeV ) while still allowing for two superheavy right-handed neutrinos, consistent with neutrino masses via see-saw and leptogenesis. We describe a mechanism for generating Yukawa couplings in this model and also discuss the low-energy phenomenology. Interestingly, the new gauge boson could explain the recent hints of lepton universality violation at LHCb, with a gauge coupling that remains perturbative up to the Planck scale. Finally, we discuss more general U ( 1 ) symmetries and show that there exist only two classes of vectorial U ( 1 ) that are both consistent with leptogenesis and remain phenomenologically viable at low-energies.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/3df29f0a52827e89dda5faf94de0c71f3ecac2a4