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Measurement of the branching fraction ratio RK at large dilepton invariant mass

A test of lepton universality between muons and electrons is performed using B+ → K+ℓ+ℓ− decays (where ℓ = e, μ), in the dilepton invariant-mass-squared region above 14.3 GeV2/c4. The data used for the measurement consists of beauty meson decays produced in proton-proton collisions, corresponding to...

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Hauptverfasser: Aaij, Roel (VerfasserIn) , Bachmann, Sebastian (VerfasserIn) , Carus, Leon (VerfasserIn) , Caspary, Rowina (VerfasserIn) , Celani, Sara (VerfasserIn) , Cocha Toapaxi, Carlos (VerfasserIn) , De Cian, Michel (VerfasserIn) , Dittmann, Lucas (VerfasserIn) , Esen, Sevda (VerfasserIn) , Glaser, Fabian (VerfasserIn) , Günther, Paul André (VerfasserIn) , Han, Xiaoxue (VerfasserIn) , Hansmann-Menzemer, Stephanie (VerfasserIn) , Herrero Gascón, Paula (VerfasserIn) , Langenbruch, Christoph (VerfasserIn) , Leverington, Blake (VerfasserIn) , Marks, Jörg (VerfasserIn) , Morgenthaler, Maurice Pierre (VerfasserIn) , Roy, Shreya (VerfasserIn) , Ruiz Diaz, Miguel (VerfasserIn) , Tat, Martin Duy (VerfasserIn) , Tuci, Giulia (VerfasserIn) , Uecker, Lennart Henning (VerfasserIn) , Unverzagt, Daniel Joachim (VerfasserIn) , Uwer, Ulrich (VerfasserIn) , Wang, Chishuai (VerfasserIn) , Zhao, Ya (VerfasserIn) , Zhelezov, Alexey (VerfasserIn)
Körperschaft: LHCb Collaboration (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 17 July 2025
In: Journal of high energy physics
Year: 2025, Heft: 7, Pages: 1-36
ISSN:1029-8479
DOI:10.1007/JHEP07(2025)198
Online-Zugang:Verlag, kostenfrei, Volltext: https://doi.org/10.1007/JHEP07(2025)198
Volltext
Verfasserangaben:the LHCb collaboration*

MARC

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245 1 0 |a Measurement of the branching fraction ratio RK at large dilepton invariant mass  |c the LHCb collaboration* 
246 3 3 |a Measurement of the branching fraction ratio R K at large dilepton invariant mass 
264 1 |c 17 July 2025 
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500 |a *The LHCb collaboration: R. Aaij, S. Bachmann, L. Carus, R. Caspary, S. Celani, C. Cocha Toapaxi, M. De Cian, L. Dittmann, S. Esen, F.C. Glaser, P.A. Günther, X. Han, S. Hansmann-Menzemer, P. Herrero Gascon, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, S.R. Roy, M. Ruiz Diaz, M.D. Tat, G. Tuci, L.H. Uecker, D.J. Unverzagt, U. Uwer, C. Wang, Y. Zhao, A. Zhelezov [und sehr viele weitere Personen] 
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500 |a Gesehen am 02.02.2026 
520 |a A test of lepton universality between muons and electrons is performed using B+ → K+ℓ+ℓ− decays (where ℓ = e, μ), in the dilepton invariant-mass-squared region above 14.3 GeV2/c4. The data used for the measurement consists of beauty meson decays produced in proton-proton collisions, corresponding to an integrated luminosity of 9 fb−1, collected by the LHCb experiment between 2011 and 2018. The ratio of branching fractions for B+ → K+μ+μ− and B+ → K+e+e− decays is measured to be $$ {R}_K=1.0{8}_{-0.09}^{+0.11}{\left(\textrm{stat}\right)}_{-0.04}^{+0.04}\left(\textrm{syst}\right) $$, which is consistent with the Standard Model prediction of unity. This constitutes the most precise test of lepton flavour universality using B+ → K+ℓ+ℓ− decays with dilepton invariant-mass-squared above the ψ(2S) mass, whilst being the first of its kind at a hadron collider. 
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SRT |a LHCBCOLLABMEASUREMEN1720 

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