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First evidence for direct CP violation in beauty to charmonium decays

The 𝐢⁒𝑃 asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay 𝐡+ →𝐽/πœ“β’πœ‹+ are precisely measured relative to the favored decay 𝐡+ →𝐽/πœ“β’πΎ+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fbβˆ’1 recorded at a center-of-mass ener...

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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) , 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: 12 March, 2025
In: Physical review letters
Year: 2025, Volume: 134, Issue: 10, Pages: 1-13
ISSN:1079-7114
DOI:10.1103/PhysRevLett.134.101801
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevLett.134.101801
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.134.101801
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Author Notes:R. Aaij et al.* (LHCb Collaboration)
Description
Summary:The 𝐢⁒𝑃 asymmetry and branching fraction of the Cabibbo-Kobayashi-Maskawa-suppressed decay 𝐡+ →𝐽/πœ“β’πœ‹+ are precisely measured relative to the favored decay 𝐡+ →𝐽/πœ“β’πΎ+ using a sample of proton-proton collision data corresponding to an integrated luminosity of 5.4 fbβˆ’1 recorded at a center-of-mass energy of 13 TeV during 2016-2018. The results of the 𝐢⁒𝑃 asymmetry difference and branching fraction ratio are Ξ”β’π’œπΆβ’π‘ƒβ‰‘π’œπΆβ’π‘ƒβ‘(𝐡+→𝐽/πœ“β’πœ‹+)βˆ’π’œπΆβ’π‘ƒβ‘(𝐡+→𝐽/πœ“β’πΎ+)=(1.29Β±0.49Β±0.08)Γ—10βˆ’2, β„›πœ‹/𝐾≑[ℬ⁑(𝐡+→𝐽/πœ“β’πœ‹+)/ℬ⁑(𝐡+→𝐽/πœ“β’πΎ+)]=(3.852Β±0.022Β±0.018)Γ—10βˆ’2, where the first uncertainties are statistical and the second are systematic. A combination with previous LHCb results based on data collected at 7 and 8 TeV in 2011 and 2012 yields Ξ”β’π’œπΆβ’π‘ƒ =(1.42 Β±0.43 Β±0.08) Γ—10βˆ’2 and β„›πœ‹/𝐾 =(3.846 Β±0.018 Β±0.018) Γ—10βˆ’2. The combined Ξ”β’π’œπΆβ’π‘ƒ value deviates from zero by 3.2 standard deviations, providing the first evidence for direct 𝐢⁒𝑃 violation in the amplitudes of beauty decays to charmonium final states.
Item Description: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.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 08.01.2026
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.134.101801

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