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Measurement of the mass and production rate of [xi] b [bar] baryons

The first measurement of the production rate of Ξ−b baryons in pp collisions relative to that of Λ0b baryons is reported, using data samples collected by the LHCb experiment, and corresponding to integrated luminosities of 1, 2 and 1.6 fb−1 at √s=7, 8 and 13 TeV, respectively. In the kinematic regio...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Berninghoff, Daniel (Author) , Braun, Svende (Author) , Comerma-Montells, Albert (Author) , D'Argent, Philippe (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) , Hu, Jiangqiao (Author) , Kecke, Matthieu (Author) , Kolpin, Michael (Author) , Kopecná, Renata (Author) , Leverington, Blake (Author) , Malygina, Hanna (Author) , Marks, Jörg (Author) , Meinert, Nis (Author) , Mitzel, Dominik (Author) , Neubert, Sebastian (Author) , Piucci, Alessio (Author) , Skidmore, Nicola (Author) , Stahl, Marian (Author) , Stemmle, Simon (Author) , Uwer, Ulrich (Author) , Viemann, Harald (Author) , Waldi, Roland (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 22 March 2019
In: Physical review
Year: 2019, Volume: 99, Issue: 5
ISSN:2470-0029
DOI:10.1103/PhysRevD.99.052006
Online Access:Verlag, Volltext: https://doi.org/10.1103/PhysRevD.99.052006
Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.99.052006
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Author Notes:R. Aaij et al. (LHCb Collaboration)
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Summary:The first measurement of the production rate of Ξ−b baryons in pp collisions relative to that of Λ0b baryons is reported, using data samples collected by the LHCb experiment, and corresponding to integrated luminosities of 1, 2 and 1.6 fb−1 at √s=7, 8 and 13 TeV, respectively. In the kinematic region 2<η<6 and pT<20 GeV/c, we measure fΞ−bfΛ0bB(Ξ−b→J/ψΞ−)B(Λ0b→J/ψΛ)=(10.8±0.9±0.8)×10−2 [√s=7,8 TeV], fΞ−bfΛ0bB(Ξ−b→J/ψΞ−)B(Λ0b→J/ψΛ)=(13.1±1.1±1.0)×10−2 [√s=13 TeV], where fΞ−b and fΛ0b are the fragmentation fractions of b quarks into Ξ−b and Λ0b baryons, respectively; B represents branching fractions; and the uncertainties are due to statistical and experimental systematic sources. The values of fΞ−b/fΛ0b are obtained by invoking SU(3) symmetry in the Ξ−b→J/ψΞ− and Λ0b→J/ψΛ decays. Production asymmetries between Ξ−b and ¯Ξ+b baryons are also reported. The mass of the Ξ−b baryon is also measured relative to that of the Λ0b baryon, from which it is found that m(Ξ−b)=5796.70±0.39±0.15±0.17 MeV/c2, where the last uncertainty is due to the precision on the known Λ0b mass. This result represents the most precise determination of the Ξ−b mass.
Item Description:LHCb Collaboration: R. Aaij, P. d’Argent, S. Bachmann, D. Berninghoff, S. Braun, M. Brodski, A. Comerma-Montells, M. De Cian, M. Dziewiecki, D. Gerick, J.P. Grabowski, X. Han, S. Hansmann-Menzemer, J. Hu, M. Kecke, M. Kolpin, R. Kopecna, B. Leverington, H. Malygina, J. Marks, D.S. Mitzel, S. Neubert, A. Piucci, N. Skidmore, M. Stahl, S. Stemmle, U. Uwer, A. Zhelezov [und weitere]
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Im Titel steht der Buchstabe b mit einem Oberstrich
Physical Description:Online Resource
ISSN:2470-0029
DOI:10.1103/PhysRevD.99.052006

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