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Measurement of b hadron production fractions in 7 TeV pp collisions

Measurements of b hadron production ratios in proton-proton collisions at a center-of-mass energy of 7 TeV with an integrated luminosity of 3 pb−1 are presented. We study the ratios of strange B meson to light B meson production fs/(fu+fd) and Λ0b baryon to light B meson production fΛb/(fu+fd) as a...

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Main Authors: Aaij, Roel (Author) , Bachmann, Sebastian (Author) , Bien, Alexander (Author) , Blouw, Johan (Author) , Britsch, Markward (Author) , Dordei, Francesca (Author) , Eisele, Franz (Author) , Färber, Christian (Author) , Hansmann-Menzemer, Stephanie (Author) , Jäger, Andreas (Author) , Kreplin, Katharina (Author) , Krocker, Georg Alexander (Author) , Krokovny, Pavel (Author) , Langenbruch, Christoph (Author) , Linn, Christian (Author) , Marks, Jörg (Author) , Meißner, Marco (Author) , Seyfert, Paul (Author) , Stahl, Sascha (Author) , Tilburg, Jeroen van (Author) , Uwer, Ulrich (Author) , Wandernoth, Sebastian (Author) , Wiedner, Dirk (Author) , Zhelezov, Alexey (Author)
Corporate Author: LHCb Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 24 February 2012
In: Physical review. D, Particles, fields, gravitation, and cosmology
Year: 2012, Volume: 85, Issue: 3
ISSN:1550-2368
DOI:10.1103/PhysRevD.85.032008
Online Access:Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevD.85.032008
Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevD.85.032008
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Author Notes:R. Aaji et al.* (The LHCb Collaboration)
Description
Summary:Measurements of b hadron production ratios in proton-proton collisions at a center-of-mass energy of 7 TeV with an integrated luminosity of 3 pb−1 are presented. We study the ratios of strange B meson to light B meson production fs/(fu+fd) and Λ0b baryon to light B meson production fΛb/(fu+fd) as a function of the charmed hadron-muon pair transverse momentum pT and the b hadron pseudorapidity η, for pT between 0 and 14 GeV and η between 2 and 5. We find that fs/(fu+fd) is consistent with being independent of pT and η, and we determine fs/(fu+fd)=0.134±0.004+0.011−0.010, where the first error is statistical and the second systematic. The corresponding ratio fΛb/(fu+fd) is found to be dependent upon the transverse momentum of the charmed hadron-muon pair, fΛb/(fu+fd)=(0.404±0.017(stat)±0.027(syst)±0.105(Br))×[1−(0.031±0.004(stat)±0.003(syst))×pT(GeV)], where Br reflects an absolute scale uncertainty due to the poorly known branching fraction B(Λ+c→pK−π+). We extract the ratio of strange B meson to light neutral B meson production fs/fd by averaging the result reported here with two previous measurements derived from the relative abundances of ¯¯¯B0s→D+sπ− to ¯¯¯B0→D+K− and ¯¯¯B0→D+π−. We obtain fs/fd=0.267+0.021−0.020.
Item Description:R. Aaij, S. Bachmann, A. Bien, J. Blouw, M. Britsch, F. Dordei, F. Eisele, C. Fäber, S. Hansmann-Menzemer, A. Jaeger, K. Kreplin, G. Krocker, P. Krokovny, C. Langenbruch, C. Linn, J. Marks, M. Meissner, P. Seyfert, S. Stahl, J. v. Tilburg, U. Uwer, S. Wandernoth, D. Wiedner, A. Zhelezov [und weitere]
Gesehen am 31.10.2018
Physical Description:Online Resource
ISSN:1550-2368
DOI:10.1103/PhysRevD.85.032008

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