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K.Websdale, D.Weiden, A.Weisser, C.Whitehead, M.Wilkinson, G.Wilkinson, M.Williams, I.Williams, M. R. J.Williams, M.Williams, T.Wilson, F. F.Winn, M.Wislicki, W.Witek, M.Wormser, G.Wotton, S. A.Wyllie, K.Xiao, D.Xie, Y.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.Zhang, D.Zhang, L.Zhang, W. C.Zhang, Y.Zhelezov, A.Zheng, Y.Zhu, X.Zhukov, V.Zonneveld, J. B.Zucchelli, S.2020-01-092020-01-092020-01-092019-12-1210.1103/PhysRevLett.123.241802https://infoscience.epfl.ch/handle/20.500.14299/164460WOS:000502271300004A search for the lepton-flavor violating decays B+ -> K+ mu(+/-)e(-/+) is performed using a sample of proton-proton collision data, collected with the LHCb experiment at center-of-mass energies of 7 and 8 TeV and corresponding to an integrated luminosity of 3 fb(-1). No significant signal is observed, and upper limits on the branching fractions are set as B(B+ -> K+ mu(+/-)e(+)) < 7.0(95) x 10(-9) and B(B+ -> K+ mu(+/- )e(-)) < 6.4(8.8) x 10(-9) at 90% (95)% confidence level. The results improve the current best limits on these decays by more than one order of magnitude.Physics, MultidisciplinaryPhysicstooltext::journal::journal article::research article