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arXiv · 1604.03088

Non-abelian gauge extensions for B-decay anomalies

Sofiane M. Boucenna·Alejandro Celis·Javier Fuentes-Martin·Avelino Vicente·Javier Virto
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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 $b \to c \ell ν$ 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.

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Sofiane M. Boucenna, Alejandro Celis, Javier Fuentes-Martin, Avelino Vicente, Javier Virto. 2016-05-18. Non-abelian gauge extensions for B-decay anomalies. https://doi.org/10.1016/j.physletb.2016.06.067

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