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

C. J. G. Onderwater; LHCb Collaboration

doi:10.1103/PhysRevLett.122.191801

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

C. J. G. Onderwater
, LHCb Collaboration

Precision Frontier

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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.

Original language	English
Article number	191801
Number of pages	13
Journal	Physical Review Letters
Volume	122
Issue number	19
DOIs	https://doi.org/10.1103/PhysRevLett.122.191801
Publication status	Published - 13-May-2019

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@article{7039b92bb3294aa4a87c0375f2daca1c,

title = "Search for Lepton-Universality Violation in B + → K + ℓ + ℓ − Decays",

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.",

author = "R. Aaij and B. Adeva and M. Adinolfi and Z. Ajaltouni and S. Akar and J. Albrecht and F. Alessio and L. Dufour and M Mulder and Onderwater, \{C. J. G.\} and A. Pellegrino and S. Tolk and \{van Veghel\}, M. and \{LHCb Collaboration\}",

year = "2019",

month = may,

day = "13",

doi = "10.1103/PhysRevLett.122.191801",

language = "English",

volume = "122",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "AMER PHYSICAL SOC",

number = "19",

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TY - JOUR

T1 - Search for Lepton-Universality Violation in B + → K + ℓ + ℓ − Decays

AU - Aaij, R.

AU - Adeva, B.

AU - Adinolfi, M.

AU - Ajaltouni, Z.

AU - Akar, S.

AU - Albrecht, J.

AU - Alessio, F.

AU - Dufour, L.

AU - Mulder, M

AU - Onderwater, C. J. G.

AU - Pellegrino, A.

AU - Tolk, S.

AU - van Veghel, M.

AU - LHCb Collaboration

PY - 2019/5/13

Y1 - 2019/5/13

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevLett.122.191801

DO - 10.1103/PhysRevLett.122.191801

M3 - Article

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SN - 0031-9007

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JO - Physical Review Letters

JF - Physical Review Letters

IS - 19

M1 - 191801

ER -

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

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