Lepton flavor universality violation without new sources of quark flavor violation

Abstract

We show that new physics models without new flavor violating interactions can explain the recent anomalies in the $b\to s{\ell }^{+}{\ell }^{-}$ transitions. The $b\to s{\ell }^{+}{\ell }^{-}$ arises from a $Z^{\prime }$ penguin which automatically predicts the $V-A$ structure for the quark currents in the effective operators. This framework can be realized either in a renormalizable $U(1{)}^{\prime }$ setup or be due to new strongly interacting dynamics. The di-muon resonance searches at the LHC are becoming sensitive to this scenario since the $Z^{\prime }$ is relatively light, and could well be discovered in future searches by ATLAS and CMS.

Comments: 5 pages, 3 figures, correction of a mistake in eq. (16), Fig. 2 updated, conclusions unchanged