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Z' Mediated Flavor Changing Neutral Currents in B Meson Decays

Vernon Barger·Cheng-Wei Chiang·Paul Langacker·Hye-Sung Lee
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Abstract

We study the effects of an extra U(1)' gauge boson with flavor changing couplings with fermion mass eigenstates on certain B meson decays that are sensitive to such new physics contributions. In particular, we examine to what extent the current data on B_d -> ϕK, B_d -> η' K and B_s -> μ^+ μ^- decays may be explained in such models, concentrating on the example in which the flavor changing couplings are left-chiral. We find that within reasonable ranges of parameters, the Z' contribution can readily account for the anomaly in S_{ϕK_S} but is not sufficient to explain large branching ratio of B_d -> η' K with the same parameter value. S_{ϕK_S} and S_{η' K_S} are seen to be the dominant observables that constrain the extra weak phase in the model.

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Vernon Barger, Cheng-Wei Chiang, Paul Langacker, Hye-Sung Lee. 2003-10-14. Z' Mediated Flavor Changing Neutral Currents in B Meson Decays. https://doi.org/10.1016/j.physletb.2003.11.057

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