Search for Lepton-Universality Violation in B^{+}→K^{+}ℓ^{+}ℓ^{-} Decays.
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Peer-reviewed
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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<q^{2}<6.0 GeV^{2}/c^{4} the ratio of branching fractions is measured to be R_{K}=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 R{K} to date and is compatible with the standard model at the level of 2.5 standard deviations.
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LHCb Collaboration <a href="#n1">1</a>
Journal Title
Phys Rev Lett
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0031-9007
1079-7114
1079-7114
Volume Title
122
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American Physical Society (APS)
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Science and Technology Facilities Council (ST/N000234/1)