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Global fits to b -> s ll data and signs for lepton non-universality · Around

2014

Global fits to b -> s ll data and signs for lepton non-universality

Hurth, T., Mahmoudi, F., Neshatpour, S.

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There are some slight tensions with the SM predictions within the latest LHCb measurements.

Besides the known anomaly in one angular observable of the rare decay B -> K* mu+ mu-, another small discrepancy recently occurred.
The ratio R_K = BR(B+ -> K+ mu+ mu-) / BR(B+ -> K+ e+ e-) in the low-q^2 region has been measured by LHCb showing a 2.6 sigma deviation from the SM prediction.
In contrast to the anomaly in the rare decay B -> K* mu+ mu- which is affected by power corrections, the ratio R_K is theoretically rather clean.

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