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Non-abelian gauge extensions for B-decay anomalies
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abstract
We study the generic features of minimal gauge extensions of the Standard Model in view of recent hints of lepton-flavor non-universality in semi-leptonic $b \to s \ell^+ \ell^-$ and $b \to c \ell \nu$ decays. We classify the possible models according to the symmetry-breaking pattern and the source of flavor non-universality. We find that in viable models the $\mathrm{SU(2)}_L$ factor is embedded non-trivially in the extended gauge group, and that gauge couplings should be universal, hinting to the presence of new degrees of freedom sourcing non-universality. Finally, we provide an explicit model that can explain the $B$-decay anomalies in a coherent way and confront it with the relevant phenomenological constraints.
Forward citations
Cited by 2 Pith papers
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Scotogenic mechanism from an extended $\boldsymbol{SU(2)_1 \times SU(2)_2 \times U(1)_Y}$ electroweak symmetry
An electroweak gauge extension with a heavy scalar triplet realizes radiative neutrino masses and an accidental Z2 dark matter parity, with naturally small lepton number violation.
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Gauging the accidental symmetries of the Standard Model, and implications for the flavour anomalies
Gauging an almost arbitrary combination of baryon number, lepton numbers and hypercharge, with three new singlet fermions, yields a Z' framework that can explain the B decay flavour anomalies with a universal axial co...
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