More indications for lepton nonuniversality in b → sl+l-

Recently the LHCb collaboration has confirmed the evidence for lepton flavour nonuniversality at the 3.1 Sigma level via an updated measurement of R-K. In this work we analyse this evidence within a model independent approach. We make projections for future measurements which indicate that LHCb will be in the position to discover lepton nonuniversality with the Run 3 data in a single observable. We analyse other ratios based on our analysis of the present measurements of the ratios R-K((*)) and analyse if they are able to differentiate between various new physics options within the effective field theory at present or in the near future. We also compare the present deviations in the ratios with NP indications in the angular observables of exclusive b -> sll transitions. Finally, we update our global analysis considering all b -> sll observables altogether, including a 20-parameter fit in connection of a Wilks' test. (C) 2021 Published by Elsevier B.V.

Automated summary

The study by the LHCb collaboration confirms evidence for lepton flavour nonuniversality through updated measurements of R-K at a 3.1 Sigma level. Projections for future measurements suggest that LHCb may discover lepton nonuniversality in a single observable with Run 3 data. The study also analyzes other ratios and their ability to differentiate between various new physics options within effective field theory. Additionally, deviations in the ratios are compared with NP indications in angular observables of exclusive b -> sll transitions.