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Search for B+c → π+μ+μ− decays and measurement of the branching fraction ratio β(B+c → ψ(2S)π+)/β(B+c → J/ψπ+)

The first search for nonresonant B+c → π+μ+μ− decays is reported. The analysis uses proton–proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb−1 . No evidence for an excess of signal events over background is observed and an...

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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) , Esen, Sevda (Author) , Frau, Giulia (Author) , Glaser, Fabian (Author) , Günther, Paul André (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Herrero Gascón, Paula (Author) , Hu, Jiangqiao (Author) , Kubat, Jakub (Author) , Langenbruch, Christoph (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Morgenthaler, Maurice Pierre (Author) , Pais, Preema (Author) , Roy, Shreya (Author) , Ruiz Diaz, Miguel (Author) , Schmelling, Michael (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: 7 May 2024
In: The European physical journal. C, Particles and fields
Year: 2024, Volume: 84, Issue: 5, Pages: 1-17
ISSN:1434-6052
DOI:10.1140/epjc/s10052-024-12669-x
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1140/epjc/s10052-024-12669-x
Verlag, kostenfrei, Volltext: https://link.springer.com/article/10.1140/epjc/s10052-024-12669-x
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Author Notes:LHCb Collaboration
Description
Summary:The first search for nonresonant B+c → π+μ+μ− decays is reported. The analysis uses proton–proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb−1 . No evidence for an excess of signal events over background is observed and an upper limit is set on the branching fraction ratio B(B+c → π+μ+μ−)/B(B+c → J/ψπ+) < 2.1×10−4 at 90% confidence level. Additionally, an updated measurement of the ratio of the B+c → ψ(2S)π+ and B+c → J/ψπ+ branching fractions is reported. The ratio B(B+c → ψ(2S)π+)/B(B+c → J/ψπ+) is measured to be 0.254 ± 0.018 ± 0.003 ± 0.005, where the first uncertainty is statistical, the second systematic, and the third is due to the uncertainties on the branching fractions of the leptonic J/ψ and ψ(2S) decays. This measurement is the most precise to date and is consistent with previous LHCb results.
Item Description:Im Titel sind die Zeichen "+" und "-" hochgestellt
Im Titel ist der Buchstabe "c" in B+c jeweils tiefgestellt
The LHCb collaboration: R. Aaij, S. Bachmann, L. Carus, R. Caspary, S. Celani, C.E. Cocha Toapaxi, M. De Cian, S. Esen, G. Frau, F. Glaser, P.A. Günther, X. Han, S. Hausmann-Menzemer, P. Herrero Gascon, J. Hu, J. Kubat, C. Langenbruch, B. Leverington, J. Marks, M.P. Morgenthaler, P.R. Pais, S.R. Roy, M. Ruiz Diaz, M. Schmelling, G. Tuci, L.H. Uecker, D.J. Unverzagt, U. Uwer, C. Wang, L. Witola, Y. Zhao, A. Zhelezov und weitere 1066
Gesehen am 08.10.2024
Physical Description:Online Resource
ISSN:1434-6052
DOI:10.1140/epjc/s10052-024-12669-x

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