Measurement of prompt J/ψ pair production in pp collisions at s √s = 7 Tev
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Khachatryan-2014-Measurement of promp.pdf
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Author(s)
Apyan, Aram
Barbieri, Richard Alexander
Busza, Wit
Cali, Ivan Amos
Chan, M.
Di Matteo, Leonardo
Dutta, Valentina
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Gulhan, Doga Can
Date Issued
September 2014
Journal
Journal of High Energy Physics
Publisher
Springer-Verlag Berlin Heidelberg
Citation
Khachatryan, V., A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, J. Erö, et al. “Measurement of Prompt J/ψ Pair Production in Pp Collisions at s $$ \sqrt{s} $$ = 7 Tev.” J. High Energ. Phys. 2014, no. 9 (September 2014).
Version
Final published version
Abstract
Production of prompt J/ψ meson pairs in proton-proton collisions at s√ = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb[superscript −1]. The two J/ψ mesons are fully reconstructed via their decays into μ + μ − pairs. This observation provides for the first time access to the high-transverse-momentum region of J/ψ pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/ψ transverse momentum (p[subscript T][superscript J/ψ] ) and rapidity (|y [superscript J/ψ] |): |y [superscript J/ψ] | < 1.2 for p T[superscript J/ψ] > 6.5 GeV/c; 1.2 < |y [superscript J/ψ] | < 1.43 for a p T threshold that scales linearly with |y [superscript J/ψ] | from 6.5 to 4.5 GeV/c; and 1.43 < |y[superscript J/ψ] | < 2.2 for p [subscript T] [superscript J/ψ] > 4.5 GeV/c. The total cross section, assuming unpolarized prompt J/ψ pair production is 1.49 ± 0.07 (stat) ±0.13 (syst) nb. Different assumptions about the J/ψ polarization imply modifications to the cross section ranging from −31% to +27%.
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/10.1007/JHEP09(2014)094
