Search for Lepton-Universality Violation in B + → K + ℓ + ℓ − Decays



Aaij, R, Beteta, C Abellan, Adeva, B, Adinolfi, M, Aidala, CA, Ajaltouni, Z, Akar, S, Albicocco, P, Albrecht, J, Alessio, F
et al (show 841 more authors) (2019) Search for Lepton-Universality Violation in B + → K + ℓ + ℓ − Decays. Physical Review Letters, 122.

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Abstract

A measurement of the ratio of branching fractions of the decays B + → K + μ + μ − 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     GeV 2 / c 4 the ratio of branching fractions is measured to be R K = 0.84 6 + 0.060 − 0.054 + 0.016 − 0.014 , 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.

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 15 Aug 2019 09:42
Last Modified: 24 Oct 2021 15:10
DOI: 10.1103/PhysRevLett.122.191801
Open Access URL: http://doi.org/10.1103/PhysRevLett.122.191801
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3051815