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Precision measurement of the mass and lifetime of the [Xi]−b baryon

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We report on measurements of the mass and lifetime of the Ξ−b baryon using about 1800 Ξ−b decays reconstructed in a proton-proton collision data set corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb experiment. The decays are reconstructed in the Ξ−b→Ξ0cπ−, Ξ0c→pK−K−π+ chan...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Bien, Alexander (Author) , Comerma-Montells, Albert (Author) , De Cian, Michel (Author) , Dordei, Francesca (Author) , Esen, Sevda (Author) , Färber, Christian (Author) , Gersabeck, Evelina (Author) , Grillo, Lucia (Author) , Han, Xiaoxue (Author) , Hansmann-Menzemer, Stephanie (Author) , Jäger, Andreas (Author) , Kolpin, Michael (Author) , Kreplin, Katharina (Author) , Krocker, Georg Alexander (Author) , Leverington, Blake (Author) , Marks, Jörg (Author) , Meißner, Marco (Author) , Neuner, Max (Author) , Nikodem, Thomas (Author) , Seyfert, Paul (Author) , Stahl, Marian (Author) , Stahl, Sascha (Author) , Uwer, Ulrich (Author) , Vesterinen, Mika (Author) , Wandernoth, Sebastian (Author) , Wiedner, Dirk (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 9 December 2014
In: Physical review letters
Year: 2014, Volume: 113, Issue: 24
ISSN:1079-7114
DOI:10.1103/PhysRevLett.113.242002
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevLett.113.242002
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevLett.113.242002
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Author Notes:R. Aaij et al.* (LHCb Collaboration)
Description
Summary:We report on measurements of the mass and lifetime of the Ξ−b baryon using about 1800 Ξ−b decays reconstructed in a proton-proton collision data set corresponding to an integrated luminosity of 3.0 fb−1 collected by the LHCb experiment. The decays are reconstructed in the Ξ−b→Ξ0cπ−, Ξ0c→pK−K−π+ channel and the mass and lifetime are measured using the Λ0b→Λ+cπ− mode as a reference. We measure M(Ξ−b)−M(Λ0b)=178.36±0.46±0.16 MeV/c2, (τΞ−b/τΛ0b)=1.089±0.026±0.011, where the uncertainties are statistical and systematic, respectively. These results lead to a factor of 2 better precision on the Ξ−b mass and lifetime compared to previous best measurements, and are consistent with theoretical expectations.
Item Description:*LHCb Collaboration: R. Aaij, S. Bachmann, A. Bien, A. Comerma-Montells, M. De Cian, F. Dordei, S. Esen, C. Färber, E. Gersabeck, L. Grillo, X. Han, S. Hansmann-Menzemer, A. Jaeger, M. Kolpin, K. Kreplin, G. Krocker, B. Leverington, J. Marks, M. Meissner, M. Neuner, T. Nikodem, P. Seyfert, M. Stahl, S. Stahl, U. Uwer, M. Vesterinen, S. Wandernoth, D. Wiedner, A. Zhelelov [und 673 weitere Personen]
Im Titel ist Xi als griechischer Buchstabe dargestellt
Im Titel ist das Zeichen - hochgestellt und der Buchstabe b tiefgestellt
Gesehen am 01.10.2020
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/PhysRevLett.113.242002

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