Test of lepton universality using B+ → k+ l+ l- decays

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doi:10.1103/PhysRevLett.113.151601

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.

Aaij, R., Adeva, B., Adinolfi, M., Affolder, A., Ajaltouni, Z., Akar, S., et al. (2014). Test of lepton universality using B+ → k+ l+ l- decays. PHYSICAL REVIEW LETTERS, 113(15) [10.1103/PhysRevLett.113.151601].