Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Flavoured $B-L$ Local Symmetry and Anomalous Rare $B$ Decays   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.

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The categories of this paper are: cond-mat
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: cs
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: supr-con