High Energy Physics - Experiment
[Submitted on 21 Mar 2019 (v1), last revised 17 May 2019 (this version, v2)]
Title:Search for lepton-universality violation in $B^+\to K^+\ell^+\ell^-$ decays
View PDFAbstract:A measurement of the ratio of branching fractions of the decays $B^+\to K^+\mu^+\mu^-$ and $B^+\to K^+e^+e^-$ is presented. The proton-proton collision data used correspond to an integrated luminosity of $5.0\,$fb$^{-1}$ recorded with the LHCb experiment at centre-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 $R_K = {0.846\,^{+\,0.060}_{-\,0.054}\,^{+\,0.016}_{-\,0.014}}$, 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.
Submission history
From: Mitesh Patel [view email][v1] Thu, 21 Mar 2019 21:59:18 UTC (2,076 KB)
[v2] Fri, 17 May 2019 16:57:40 UTC (2,022 KB)
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