Search for Lepton-Universality Violation in B+ →k++-Decays

(LHCb Collaboration)

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

A measurement of the ratio of branching fractions of the decays B+→K+μ+μ-and B+→K+e+e-is presented. The proton-proton collision data used correspond to an integrated luminosity of 5.0 fb-1 recorded with the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. For the dilepton mass-squared range 1.1<q2<6.0 GeV2/c4 the ratio of branching fractions is measured to be RK=0.846-0.054+0.060-0.014+0.016, where the first uncertainty is statistical and the second systematic. This is the most precise measurement of RK to date and is compatible with the standard model at the level of 2.5 standard deviations.

Original languageEnglish
Article number191801
JournalPhysical Review Letters
Volume122
Issue number19
DOIs
Publication statusPublished - 13 May 2019

Funding

FundersFunder number
Not addedST/J004332/1, ST/N000250/1, ST/K003410/1, ST/N000331/1, ST/L003163/1, ST/N000242/1
Horizon 2020 Framework Programme792684
Science and Technology Facilities CouncilST/N000234/1, GRIDPP

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