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Test of lepton flavor universality with 𝐡+ β†’ 𝐾+⁒ πœ‹+ β’πœ‹βˆ’β’ β„“+ β’β„“βˆ’ decays

The first test of lepton flavor universality between muons and electrons using 𝐡+→𝐾+β’πœ‹+β’πœ‹βˆ’β’β„“+β’β„“βˆ’ (β„“ =𝑒, πœ‡) decays is presented. The measurement is performed with data from proton-proton collisions collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an in...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Carus, Leon (Author) , Caspary, Rowina (Author) , Celani, Sara (Author) , Cocha Toapaxi, Carlos (Author) , De Cian, Michel (Author) , Dittmann, Lucas (Author) , Esen, Sevda (Author) , Glaser, Fabian (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Herrero Gascón, Paula (Author) , Langenbruch, Christoph (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Morgenthaler, Maurice Pierre (Author) , Roy, Shreya (Author) , Ruiz Diaz, Miguel (Author) , Schiller, Manuel (Author) , Tat, Martin Duy (Author) , Tuci, Giulia (Author) , Uecker, Lennart Henning (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Witola, Lukas (Author) , Zhao, Ya (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 9 May, 2025
In: Physical review letters
Year: 2025, Volume: 134, Issue: 18, Pages: 1-13
ISSN:1079-7114
DOI:10.1103/PhysRevLett.134.181803
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.134.181803
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.134.181803
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Author Notes:R. Aaij et al.* (LHCb Collaboration)
Description
Summary:The first test of lepton flavor universality between muons and electrons using 𝐡+→𝐾+β’πœ‹+β’πœ‹βˆ’β’β„“+β’β„“βˆ’ (β„“ =𝑒, πœ‡) decays is presented. The measurement is performed with data from proton-proton collisions collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of 9 fbβˆ’1. The ratio of branching fractions between 𝐡+→𝐾+β’πœ‹+β’πœ‹βˆ’β’π‘’+β’π‘’βˆ’ and 𝐡+→𝐾+β’πœ‹+β’πœ‹βˆ’β’πœ‡+β’πœ‡βˆ’ decays is measured in the dilepton invariant-mass-squared range 1.1<π‘ž2<7.0 GeV2/𝑐4 and is found to be π‘…βˆ’1πΎβ’πœ‹β’πœ‹=1.3⁒1+0.18βˆ’0.17(stat)⁒ +0.12βˆ’0.09⁒(syst), in agreement with the standard model prediction. The first observation of the 𝐡+ →𝐾+β’πœ‹+β’πœ‹βˆ’β’π‘’+β’π‘’βˆ’ decay is also reported.
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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 Gascón, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, S.R. Roy, M. Ruiz Diaz, M. Schiller, M.D. Tat, G. Tuci, L.H. Uecker, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, Y. Zhao, A. Zhelezov [und viele weitere]
Gesehen am 11.02.2026
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.134.181803

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