Inclusive quarkonium production in pp collisions at √s = 5.02 TeV

S. Acharya, J. Adolfsson, S. Basu, P. Christiansen, O. Matonoha, A.F. Nassirpour, A. Ohlson, A. Oskarsson, T. Richert, O.V. Rueda, D. Silvermyr, N. Zurlo, ALICE Collaboration

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This article reports on the inclusive production cross section of several quarkonium states, J / ψ, ψ(2 S) , Υ (1 S) , Υ (2 S) , and Υ (3 S) , measured with the ALICE detector at the LHC, in pp collisions at s=5.02 TeV. The analysis is performed in the dimuon decay channel at forward rapidity (2.5 < y< 4). The integrated cross sections and transverse-momentum (pT) and rapidity (y) differential cross sections for J / ψ, ψ(2 S) , Υ (1 S) , and the ψ(2 S) -to-J / ψ cross section ratios are presented. The integrated cross sections, assuming unpolarized quarkonia, are: σJ / ψ (pT< 20 GeV/c) = 5.88 ± 0.03 ± 0.34μb, σψ ( 2 S ) (pT< 12 GeV/c) = 0.87 ± 0.06 ± 0.10μb, σΥ ( 1 S ) (pT< 15 GeV/c) = 45.5 ± 3.9 ± 3.5 nb, σΥ (2 S) (pT< 15 GeV/c) = 22.4 ± 3.2 ± 2.7 nb, and σΥ (3 S) (pT< 15 GeV/c) = 4.9 ± 2.2 ± 1.0 nb, where the first (second) uncertainty is the statistical (systematic) one. For the first time, the cross sections of the three Υ states, as well as the ψ(2 S) one as a function of pTand y, are measured at s=5.02 TeV at forward rapidity. These measurements also significantly extend the J / ψpTreach and supersede previously published results. A comparison with ALICE measurements in pp collisions at s=2.76, 7, 8, and 13 TeV is presented and the energy dependence of quarkonium production cross sections is discussed. Finally, the results are compared with the predictions from several production models. © 2023, The Author(s).
Original languageEnglish
Article number61
JournalEuropean Physical Journal C
Issue number1
Publication statusPublished - 2023

Subject classification (UKÄ)

  • Subatomic Physics


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