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|Paper IPM / Particles And Accelerator / 13972||
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* μ+μ−, another small discrepancy recently occurred. The ratio RK = BR(B+ → K+ μ+ μ−) / BR(B+ → K+ e+ e−) in the low-q2 region has been measured by LHCb showing a 2.6σ deviation from the SM prediction. In contrast to the anomaly in the rare decay B → K* μ+μ− which is affected by power corrections, the ratio RK is theoretically rather clean.
We analyse all the b → s ll data with global fits and in particular explore the possibility of breaking of lepton universality.
Possible cross-checks with an analysis of the inclusive B → Xs l+l− decay are also explored
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