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Measurement of the ratio of branching fractions B (B+c→J [psi] [tau] + [nu] [tau])/B(B+c→J/[psi] [mu] + [nu] [mu])

A measurement is reported of the ratio of branching fractions R(J/ψ)=B(B+c→J/ψτ+ντ)/B(B+c→J/ψμ+νμ), where the τ+ lepton is identified in the decay mode τ+→μ+νμ¯ντ. This analysis uses a sample of proton-proton collision data corresponding to 3.0 fb−1 of integrated luminosity recorded with the LHCb ex...

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Main Authors: Aaij, Roel (Author) , D'Argent, Philippe (Author) , Bachmann, Sebastian (Author) , Berninghoff, Daniel (Author) , Braun, Svende (Author) , Comerma-Montells, Albert (Author) , De Cian, Michel (Author) , Dziewiecki, Michal (Author) , Gerick, David (Author) , Grabowski, Jascha (Author) , Grünberg, Oliver (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Heß, Miriam (Author) , Kecke, Matthieu (Author) , Khanji, Basem (Author) , Kolpin, Michael (Author) , Kopecná, Renata (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Mitzel, Dominik (Author) , Meinert, Nis (Author) , Neubert, Sebastian (Author) , Neuner, Max (Author) , Piucci, Alessio (Author) , Stahl, Marian (Author) , Stemmle, Simon (Author) , Uwer, Ulrich (Author) , Viemann, Harald (Author) , Waldi, Roland (Author) , Zhelezov, Alexey (Author) , Tilburg, Jeroen van (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 4 April 2018
In: Physical review letters
Year: 2018, Volume: 120, Issue: 12
ISSN:1079-7114
DOI:10.1103/PhysRevLett.120.121801
Online Access:Verlag, Volltext: https://doi.org/10.1103/PhysRevLett.120.121801
Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.120.121801
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Author Notes:R. Aaij et al.* (LHCb Collaboration)
Description
Summary:A measurement is reported of the ratio of branching fractions R(J/ψ)=B(B+c→J/ψτ+ντ)/B(B+c→J/ψμ+νμ), where the τ+ lepton is identified in the decay mode τ+→μ+νμ¯ντ. This analysis uses a sample of proton-proton collision data corresponding to 3.0 fb−1 of integrated luminosity recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. A signal is found for the decay B+c→J/ψτ+ντ at a significance of 3 standard deviations corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be R(J/ψ)=0.71±0.17(stat)±0.18(syst). This result lies within 2 standard deviations above the range of central values currently predicted by the standard model.
Item Description:published 23 March 2018; corrected 4 April 2018
Im Titel sind "+" hochgestellt, "mu" und "tau" tiefgestellt
Im Titel sind "+" und "c" untereinander geschrieben: "+" hochgestellt, "c" tiefgestellt
Im Titel werden psi, tau, mu und nu als griechische Buchstaben dargestellt
R. Aaij, P. d'Argent, S. Bachmann, D. Berninghoff, S. Braun, M. De Cian, A. Comerma-Montells, M. Dziewiecki, D. Gerick, J.P. Grabowski, X. Han, S. Hansmann-Menzemer, M. Kecke, B. Khanji, M. Kolpin, R. Kopecna, 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] (LHCb Collaboration)
Gesehen am 12.06.2019
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.120.121801

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