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VianaVieira, D.Vieites Diaz, M.Viemann, H.Vilasis-Cardona, X.Vitkovskiy, A.Vitti, M.Volkov, V.Vollhardt, A.Bruch, D. VomVoneki, B.Vorobyev, A.Vorobyev, V.Voropaev, N.Waldi, R.Walsh, J.Wang, J.Wang, M.Wang, Y.Wang, Z.Ward, D. R.Wark, H. M.Watson, N. K.Websdale, D.Weiden, A.Weisser, C.Whitehead, M.Wilkinson, G.Wilkinson, M.Williams, I.Williams, M.Williams, M. R. J.Williams, T.Wilson, F. F.Winn, M.Wislicki, W.Witek, M.Wormser, G.Wotton, S. A.Wyllie, K.Xiao, D.Xie, Y.Xing, H.Xu, A.Xu, M.Xu, Q.Xu, Z.Yang, Z.Yao, Y.Yeomans, L. E.Yin, H.Yu, J.Yuan, X.Yushchenko, O.Zarebski, K. A.Zavertyaev, M.Zeng, M.Zhang, D.Zhang, L.Zhang, C.Zhang, Y.Zhelezov, A.Zheng, Y.Zhu, X.Zhukov, V.Zonneveld, J. B.Zucchelli, S.2019-06-182019-06-182019-06-182019-05-1310.1103/PhysRevLett.122.191801https://infoscience.epfl.ch/handle/20.500.14299/158191WOS:000468227800003A measurement of the ratio of branching fractions of the decays B+ -> K+mu(+)mu(-) 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 GeV2/c(4) the ratio of branching fractions is measured to be R-K = 0.846(-0.054-0.014)(+0.060+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.Physics, MultidisciplinaryPhysicstext::journal::journal article::research article