# Test of lepton universality using B+→K+ℓ+ℓ− decays

LHCb Collaboration; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Serra, N; Vollhardt, A; et al (2014). Test of lepton universality using B+→K+ℓ+ℓ− decays. Physical Review Letters, 113(151601):online.

## 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 3.0 fb−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+0.090−0.074(stat)±0.036(syst). This value is the most precise measurement of the ratio of branching fractions to date and is compatible with the SM prediction within 2.6 standard deviations.

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 3.0 fb−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+0.090−0.074(stat)±0.036(syst). This value is the most precise measurement of the ratio of branching fractions to date and is compatible with the SM prediction within 2.6 standard deviations.

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70 citations in Web of Science®
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Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2014 20 Feb 2015 16:24 05 Apr 2016 19:00 American Physical Society 0031-9007 https://doi.org/10.1103/PhysRevLett.113.151601
Permanent URL: https://doi.org/10.5167/uzh-107793