Abstract
We show that new physics models without new flavor violating interactions can explain the recent anomalies in the $b\ensuremath{\rightarrow}s{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$ transitions. The $b\ensuremath{\rightarrow}s{\ensuremath{\ell}}^{+}{\ensuremath{\ell}}^{\ensuremath{-}}$ arises from a ${Z}^{\ensuremath{'}}$ penguin which automatically predicts the $V\ensuremath{-}A$ structure for the quark currents in the effective operators. This framework can either be realized in a renormalizable $U(1{)}^{\ensuremath{'}}$ setup or be due to new strongly interacting dynamics. The dimuon resonance searches at the LHC are becoming sensitive to this scenario since the ${Z}^{\ensuremath{'}}$ is relatively light, and could well be discovered in future searches by ATLAS and CMS.
Highlights
Lepton flavor universality (LFU) of electroweak interactions is one of the key predictions of the standard model (SM)
We show that new physics models without new flavor violating interactions can explain the recent anomalies in the b → slþl− transitions
The V − A current in the quark sector is a clear prediction of the models, while the structure of the couplings to leptons depends on the details of the model
Summary
Lepton flavor universality (LFU) of electroweak interactions is one of the key predictions of the standard model (SM). The NP models that we are proposing as possible explanations of b → slþl− anomalies have several salient features They are examples of NP with (general) minimal flavor violation (MFV) [47,48,49,50,51] and satisfy the present experimental bounds from other flavor changing neutral current transitions, beside b → slþl−. There is more freedom in the structure of couplings to muons, where both V − A and V þ A currents are possible Since in this class of models the b → slþl− transition is generated at the one-loop level, the Z0 is quite light, with a mass of a few hundred GeV, and can be searched for at the LHC in high pT processes
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