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Amato, S.; Andreotti, M.; Atzeni, M.; Ben-Haim, E.; Betancourt, C.; Bolognani, C. S.; Brea Rodriguez, A.; Buytaert, J.; Cholak, S.; Cliff, H. V.; Craik, D. C.; Currie, R.; De Capua, S.; De Serio, M.; Delaney, B.; Dobishuk, V.; Dolmatov, A.; Duda, P.; Elashri, M. E; Fernandez Gomez, M.; Fini, R. A.; Foulds-Holt, D.; Gallas Torreira, A.; Gao, Y.; Garrido, L.; Gaspar, C.; Geertsema, R. E.; Giugliano, C.; Gkougkousis, E. L.; Grieser, N. A.; Hansmann-Menzemer, S.; Hennessy, K.; Hicheur, A.; Hou, Y.; Hutchcroft, D.; Ibis, P.; Jaimes Elles, S. J.; John, M.; Karpenkov, D.; Ketel, T.; Khreich, G.; Kmiec, M. R.; Kopciewicz, P.; Koppenburg, P.; Kravchenko, P.; Kretzschmar, S.; Kucewicz, W.; Lacarrere, D.; Landesa Gomez, C.; Lazzari, F.; Lee, S. H.; Lenisa, P.; Li, A.; Li, T.; Maisuzenko, D.; Maratas, J. M.; Marshall, P. J.; Millard, E.; Mödden, A.; Mombächer, T.; Moron, J.; Morris, A. G.; Mu, H.; Mulder, M.; Naik, P.; Normand, C.; Okamura, S.; Oliva, F.; Passalacqua, B.; Perret, P.; Pili, M.; Ricci, A. M.; Robertson, G.; Rodriguez Fernandez, E.; Ryzka, J.; Santacesaria, R.; Shang, Y.; Shapkin, M.; Shen, Z.; Shi, B.; Shimizu, Y.; Silva Coutinho, R.; Skidmore, N.; Spaan, B.; Stein, E. N.; Szabelski, A.; Tisserand, V.; Tobin, M.; Van Dijk, M.; Vázquez Sierra, C.; Vesterinen, M.; Vilella Figueras, E.; Villa, A.; Watson, N. K.; Wei, Y.; Westhenry, B. D. C.; Whitehead, M.; Yang, Y.; Zaffaroni, E.; Zhou, T.
The journal of high energy physics, 08/2023, Letnik: 2023, Številka: 8Journal Article
A bstract The associated production of prompt J/ψ and Υ mesons in pp collisions at a centre-of-mass energy of $$ \sqrt{s} $$ s = 13 TeV is studied using LHCb data, corresponding to an integrated luminosity of 4 fb − 1 . The measurement is performed for J/ψ ( Υ ) mesons with a transverse momentum p T < 10 (30) GeV/ c in the rapidity range 2 . 0 < y < 4 . 5. In this kinematic range, the cross-section of the associated production of prompt J/ψ and Υ (1 S ) mesons is measured to be 133 ± 22 ± 7 ± 3 pb, with a significance of 7 . 9 σ , and that of prompt J/ψ and Υ (2 S ) mesons to be 76 ± 21 ± 4 ± 7 pb, with a significance of 4 . 9 σ . The first uncertainty is statistical, the second systematic, and the third due to uncertainties on the used branching fractions. This is the first observation of the associated production of J/ψ and Υ (1 S ) in proton-proton collisions. Differential cross-sections are measured as functions of variables that are sensitive to kinematic correlations between the J/ψ and Υ (1 S ) mesons. The effective cross-sections of the associated production of prompt J/ψ and Υ mesons are obtained and found to be compatible with measurements using other particle productions.
