Measurement of prompt J/ψ pair production in pp collisions at s √s = 7 Tev
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; Klute, Markus; Lai, Yue Shi; Lee, Yen-Jie; Ma, Teng; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Stoeckli, Fabian; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Zanetti, Marco; Roland, Christof E; Roland, Gunther M; Sumorok, Konstanty C; Yang, Mingming; Wyslouch, Victoria; Bauer, Gerry P; Levin, Andrew Michael; Luckey Jr, P David; ... Show more Show less
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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%.
Date issued
2014-09Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
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
ISSN
1029-8479