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Improved measurement of η/η′ mixing in B(s)0 →J/ψη(ʹ) decays

Branching fraction ratios between the decays B(s)0 → J/ψη(ʹ) are measured using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. They are used to constrain the η/η′ mixing angle, ϕP, and...

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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) , 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) , Schmelling, Michael (Author) , Tat, Martin Duy (Author) , Tuci, Giulia (Author) , Uecker, Lennart Henning (Author) , Unverzagt, Daniel Joachim (Author) , Uwer, Ulrich (Author) , Wang, Chishuai (Author) , Wolf, Tom (Author) , Zavertyaev, Mikhail (Author) , Zhao, Ya (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: October 14, 2025
In: Journal of high energy physics
Year: 2025, Volume: 2025, Issue: 10, Pages: 1-31
ISSN:1029-8479
DOI:10.1007/JHEP10(2025)113
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1007/JHEP10(2025)113
Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1007/JHEP10(2025)113
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Author Notes:the LHCb collaboration
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Summary:Branching fraction ratios between the decays B(s)0 → J/ψη(ʹ) are measured using proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13 TeV, corresponding to an integrated luminosity of 9 fb−1. They are used to constrain the η/η′ mixing angle, ϕP, and to probe the presence of a possible glueball component in the η′ meson, described by the gluonic mixing angle ϕG. While the value of ϕP is compatible with existing experimental determinations and theoretical calculations, the angle ϕG differs from zero by more than four standard deviations, which points to a substantial glueball component in the η′ meson and/or unexpectedly large contributions from gluon-mediated processes in these decays. The absolute branching fractions are also measured relative to that of the well-established decay, which serves as the normalisation channel. These results supersede the previous LHCb measurements and are the most precise to date.
Item Description:Im Titel sind " ' ", "0" und "(')" hochgestellt und "(s)" ist tiefgestellt
The LHCb collaboration: R. Aaij, S. Bachmann, L. Carus, R. Caspary, S. Celani, C.E. Cocha Toapaxi, L. Dittmann, S. Esen, F. Glaser, P.A. Günther, X. Han, S. Hausmann-Menzemer, P. Herrero Gascon, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, S.R. Roy, M. Ruiz Diaz, M. Schiller, M. Schmelling, M.D. Tat, G. Tuci, L.H. Uecker, D.J. Unverzagt, U. Uwer, C. Wang, T. Wolf, M. Zavertyaev, Y. Zhao, A. Zhelezov und weitere 1174
Gesehen am 05.05.2026
Physical Description:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP10(2025)113

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