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A Natural origin for the LHCb anomalies

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arxiv 1608.02362 v2 pith:X7KADRE7 submitted 2016-08-08 hep-ph

classification hep-ph
keywords anomalieselectroweakflavorbottomdynamicsflavor-changinglhcbmuon
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abstract

The anomalies recently found by the LHCb collaboration in $B$-meson decays seem to point towards the existence of new physics coupled non-universally to muons and electrons. We show that a beyond-the-Standard-Model dynamics with these features naturally arises in models with a warped extra-dimension that aim to solve the electroweak Hierarchy Problem. The attractiveness of our set-up is the fact that the dynamics responsible for generating the flavor anomalies is automatically present, being provided by the massive Kaluza--Klein excitations of the electroweak gauge bosons. The flavor anomalies can be easily reproduced by assuming that the bottom and muon fields have a sizable amount of compositeness, while the electron is almost elementary. Interestingly enough, this framework correlates the flavor anomalies to a pattern of corrections in the electroweak observables and in flavor-changing processes. In particular the deviations in the bottom and muon couplings to the $Z$-boson and in $\Delta F = 2$ flavor-changing observables are predicted to be close to the present experimental bounds, and thus potentially testable in near-future experiments.

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  1. Associated $Z^\prime$ production in the flavorful $U(1)$ scenario for $R_{K^{(*)}}$

    hep-ph 2019-08 conditional novelty 5.0 of 10

    A flavorful Z' model for the B-meson anomalies predicts discoverable associated-production signatures at the HL-LHC: dimuon + b-jets for M_Z' up to ~500 GeV and tri-muon + missing energy for larger muon couplings.

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