Tests of Lepton Universality Using B0→K0Sℓ+ℓ− and B+→K*+ℓ+ℓ− Decays

Physical Review Letters. 2022. No. 128. Article 191802.

Aaij R., Abdelmotteleb A. S., Abellán Beteta C., Abudinén F., Ackernley T., Arzymatov K., Belavin V., Borisyak M., Ratnikov F., Ustyuzhanin A., Boldyrev A., Derkach D., Hushchyn M., Karpov M., Maevskiy A., Mokhnenko S., Ryzhikov A., Popov S., Philippov A.

Tests of lepton universality in B0→K0Sℓ+ℓ− and B+→K*+ℓ+ℓ− decays where ℓ is either an electron or a muon are presented. The differential branching fractions of B0→K0Se+e− and B+→K*+e+e− decays are measured in intervals of the dilepton invariant mass squared. The measurements are performed using proton-proton collision data recorded by the LHCb experiment, corresponding to an integrated luminosity of 9  fb−1 . The results are consistent with the standard model and previous tests of lepton universality in related decay modes. The first observation of B0→K0Se+e− and B+→K*+e+e− decays is reported.

Keywords: HEP, Big Data analysis

Publication based on the results of: Machine learning to check and improve the quality of data collected at the Large Hadron Collider and other particle physics experiments (2022)