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Journal of High Energy Physics


Production of prompt J/ψ meson pairs in proton-proton collisions at s" role="presentation" style="box-sizing: inherit; display: inline; line-height: normal; word-spacing: normal; overflow-wrap: normal; text-wrap: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">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−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 T J/ψ) and rapidity (|y J/ψ|): |y J/ψ | < 1.2 for p J/ψT > 6.5 GeV/c; 1.2 < |y J/ψ| < 1.43 for a p T threshold that scales linearly with |y J/ψ| from 6.5 to 4.5 GeV/c; and 1.43 < |y J/ψ| < 2.2 for p J/ψT > 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%.


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