Z' Mediated Flavor Changing Neutral Currents in B Meson Decays

Details Z' Mediated Flavor Changing Neutral Currents in B Meson Decays Z' Mediated Flavor Changing Neutral Currents in B Meson Decays

2003-10-06

arxiv.org/abs/hep-ph/0310073v2

Phys.Lett.B580:186-196,2004

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, 6 figures. Additional references added. Small modifications and corrections to Eq.(33) and (34) added

Scientific paper

10.1016/j.physletb.2003.11.057

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 -> \phi K, B_d -> \eta' K and B_s -> \mu^+ \mu^- 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_{\phi K_S} but is not sufficient to explain large branching ratio of B_d -> \eta' K with the same parameter value. S_{\phi K_S} and S_{\eta' K_S} are seen to be the dominant observables that constrain the extra weak phase in the model.

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