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Light Resonances and the Low-$q^2$ Bin of $R_{K^*}$ · Around

2017

Light Resonances and the Low-$q^2$ Bin of $R_{K^*}$

Altmannshofer, Wolfgang, Baker, Michael J., Gori, Stefania et al.

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LHCb has reported hints of lepton-flavor universality violation in the rare decays $B \to K^{(*)} \ell^+\ell^-$, both in high- and low-$q^2$ bins.

Although the high-$q^2$ hint may be explained by new short-ranged interactions, the low-$q^2$ one cannot.
We thus explore the possibility that the latter is explained by a new light resonance.
We find that LHCb's central value of $R_{K^*}$ in the low-$q^2$ bin is achievable in a restricted parameter space of new-physics scenarios in which the new, light resonance decays preferentially to electrons and has a mass within approximately $10$ MeV of the di-muon threshold.

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