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2013

On minimal Z' explanations of the B->K*mu+mu- anomaly

Gauld, Rhorry, Goertz, Florian, Haisch, Ulrich

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Recently LHCb has announced a discrepancy of 3.7 sigma in one of the theoretically clean observables accessible through studies of angular correlations in B->K*mu+mu-.

We point out that in the most minimal Z' setup that can address this anomaly there is a model-independent triple-correlation between new physics (NP) in B->K*mu+mu-, B_s-Bbar_s mixing, and non-unitarity of the quark-mixing matrix.
This triple-correlation can be cast into a simple analytic formula that relates the NP contribution DeltaC9 to the Wilson coefficient of the semileptonic vector operator to a shift in the mass difference DeltaM_{B_s} and a violation of |Vud|^2+ |Vus|^2+ |Vub|^2 = 1.
In contrast to the individual observables the found relation depends only logarithmically on the Z' mass.

On minimal Z' explanations of the B->K*mu+mu- anomaly · Around

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