Test of Lepton Universality Using B+ -> K(+)l(+)l(-) Decays

R. Aaij, S. Ali, J.F.J. van den Brand, K. De Bruyn, P.N.Y. David, C. Farinelli, V.A.M. Heijne, T.J. Ketel, R.F. Koopman, A. Kozlinskiy, J. van Leerdam, M.H.M. Merk, S. Oggero, A. Pellegrino, H.G. Raven, H. Snoek, V. Syropoulos, S. Tolk, Collaboration LHCb

Research output: Contribution to JournalArticleAcademicpeer-review

Abstract

A measurement of the ratio of the branching fractions of the B+→K+μ+μ- and B+→K+e+e- decays is presented using proton-proton collision data, corresponding to an integrated luminosity of 3.0fb-1, recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. The value of the ratio of branching fractions for the dilepton invariant mass squared range 1<q2<6GeV2/c4 is measured to be 0.745-0.074+0.090(stat)±0.036(syst). This value is the most precise measurement of the ratio of branching fractions to date and is compatible with the standard model prediction within 2.6 standard deviations.
Original languageEnglish
Article number151601
JournalPhysical Review Letters
Volume113
Issue number15
DOIs
Publication statusPublished - 2014

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