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Observation of the decay Λ0b→ψ(2S)pπ−

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The Cabibbo-suppressed decay Λ b 0 → ψ(2S)pπ− is observed for the first time using a data sample collected by the LHCb experiment in proton-proton collisions corresponding to 1.0, 2.0 and 1.9 fb−1 of integrated luminosity at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The ψ(2S) mesons...

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Main Authors: Aaij, Roel (Author) , D'Argent, Philippe (Author) , Bachmann, Sebastian (Author) , Braun, Svende (Author) , De Cian, Michel (Author) , Comerma-Montells, Albert (Author) , Dordei, Francesca (Author) , Esen, Sevda (Author) , Gerick, David (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Kecke, Matthieu (Author) , Khanji, Basem (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Mitzel, Dominik (Author) , Neubert, Sebastian (Author) , Neuner, Max (Author) , Piucci, Alessio (Author) , Stahl, Marian (Author) , Stemmle, Simon (Author) , Tilburg, Jeroen van (Author) , Uwer, Ulrich (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: August 21, 2018
In: Journal of high energy physics
Year: 2018, Issue: 8
ISSN:1029-8479
DOI:10.1007/JHEP08(2018)131
Online Access:Verlag, Volltext: https://doi.org/10.1007/JHEP08(2018)131
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Author Notes:the LHCb collaboration
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Summary:The Cabibbo-suppressed decay Λ b 0 → ψ(2S)pπ− is observed for the first time using a data sample collected by the LHCb experiment in proton-proton collisions corresponding to 1.0, 2.0 and 1.9 fb−1 of integrated luminosity at centre-of-mass energies of 7, 8 and 13 TeV, respectively. The ψ(2S) mesons are reconstructed in the μ+μ− final state. The branching fraction with respect to that of the Λ b 0 → ψ(2S)pK− decay mode is measured to be B(Λ0b→ψ(2S)pπ−)B(Λ0b→ψ(2S)pK−)=(11.4±1.3±0.2)%,B(Λb0→ψ(2S)pπ−)B(Λb0→ψ(2S)pK−)=(11.4±1.3±0.2)%, \frac{\mathrm{\mathcal{B}}\left({\Lambda}_{\mathrm{b}}^0\to \uppsi \left(2\mathrm{S}\right){\mathrm{p}\uppi}^{-}\right)}{\mathrm{\mathcal{B}}\left({\Lambda}_{\mathrm{b}}^0\to \uppsi \left(2\mathrm{S}\right){\mathrm{p}\mathrm{K}}^{-}\right)}=\left(11.4\pm 1.3\pm 0.2\right)\%, where the first uncertainty is statistical and the second is systematic. The ψ(2S)p and ψ(2S)π− mass spectra are investigated and no evidence for exotic resonances is found. Open image in new window
Item Description:Im Titel werden "lambda" und "psi" als griechische Buchstaben dargestellt
Im Titel sind "0" und "b" untereinander geschrieben: "0" hochgestellt, "b" tiefgestellt
The LHCb collaboration: R. Aaij, P. d'Argent, S. Bachmann, S. Braun, A. Comerma-Montells, M. De Cian, F. Dordei, S. Esen, D. Gerick, X. Han, S. Hansmann-Menzemer, M. Kecke, B. Khanji, B. Leverington, J. Marks, D.S. Mitzel, S. Neubert, M. Neuner, A. Piucci, M. Stahl, S. Stemmle, J. van Tilburg, U. Uwer, A. Zhelezov [und weitere]
Gesehen am 28.05.2019
Physical Description:Online Resource
ISSN:1029-8479
DOI:10.1007/JHEP08(2018)131

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