Measurement of the Λb cross section and the [over bar]Λ[subscript b] ratio with J/ψΛ decays in pp collisions at √s = 7 TeV
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Chatrchyan-2012-Measurement of the c.pdf
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Author(s)
Bendavid, Joshua L.
Busza, Wit
Butz, Erik M.
Cali, Ivan Amos
Chan, M.
Dutta, Valentina
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Hahn, Kristian Allan
Kim, Y.
Alternative Title
Measurement of the Λb cross section and the Λ¯b ratio with J/ψΛ decays in pp collisions at √s = 7 TeV
Date Issued
August 2012
Journal
Physics Letters B
Publisher
Elsevier B.V.
Citation
Chatrchyan, S., V. Khachatryan, A.M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. “Measurement of the Λb cross section and the Λ¯b ratio with J/ψΛ decays in pp collisions at √s = 7 TeV.” Physics Letters B 714, no. 2–5 (August 2012): 136–157.
Version
Final published version
Abstract
The Λb differential production cross section and the cross section ratio σ(Λ¯b)/σ(Λb) are measured as functions of transverse momentum pΛ¯b[over]T and rapidity |yΛb| in pp collisions at √s = 7 TeV using data collected by the CMS experiment at the LHC. The measurements are based on Λb decays reconstructed in the exclusive final state J/ψΛ, with the subsequent decays J/ψ→μ+μ−and Λ→pπ, using a data sample corresponding to an integrated luminosity of 1.9 fb[superscript −1]. The product σ(Λb)×B(Λb→J/ψΛ) versus pΛ¯b[over]T falls faster than that of b mesons. The measured value of σ(Λb)×B(Λb→J/ψΛ) for pTΛb>10 GeV and |yΛb|<2.0 is 1.16±0.06±0.12 nb, and the integrated σ(Λ¯b)/σ(Λb) ratio is 1.02±0.07±0.09, where the uncertainties are statistical and systematic, respectively.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1016/j.physletb.2012.05.063
