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Measurement of prompt J/psi pair production in pp collisions at sqrt(s) = 7 TeV

Abstract : Production of prompt J/psi meson pairs in proton-proton collisions at sqrt(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 inverse femtobarns. The two J/psi mesons are fully reconstructed via their decays into muon pairs. This observation provides for the first time access to the high-transverse-momentum region of J/psi 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/psi transverse momentum pt[J/psi] and rapidity abs(y[J/psi]): abs(y[J/psi]) < 1.2 for pt[J/psi] > 6.5 GeV; 1.2 < abs(y[J/psi]) < 1.43 for a pt threshold that scales linearly with abs(y[J/psi]) from 6.5 to 4.5 GeV; and 1.43 < abs(y[J/psi]) < 2.2 for pt[J/psi] > 4.5 GeV. The total cross section, assuming unpolarized prompt J/psi pair production is 1.49 +/- 0.07 (stat.) +/- 0.13 (syst.) nb. Different assumptions about the J/psi polarization imply modifications to the cross section ranging from -31% to +27%.
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Contributor : Sylvie Flores <>
Submitted on : Tuesday, June 3, 2014 - 7:11:30 AM
Last modification on : Wednesday, January 6, 2021 - 6:44:02 PM

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V. Khachatryan, S. Baffioni, F. Beaudette, P. Busson, C. Charlot, et al.. Measurement of prompt J/psi pair production in pp collisions at sqrt(s) = 7 TeV. Journal of High Energy Physics, Springer, 2014, 09(2014), pp.094. ⟨10.1007/JHEP09(2014)094⟩. ⟨in2p3-00998920⟩



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