Measurement of J/ψ-pair production in pp collisions at s = 13 TeV and study of gluon transverse-momentum dependent PDFs

A bstract The production cross-section of J/ψ pairs in proton-proton collisions at a centre-of-mass energy of s = 13 TeV is measured using a data sample corresponding to an integrated luminosity of 4 . 2 fb − 1 collected by the LHCb experiment. The measurement is performed with both J/ψ mesons in th...

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Veröffentlicht in:	The journal of high energy physics 2024-03, Vol.2024 (3), p.88
Hauptverfasser:	Agapopoulou, C., Alessio, F., Aliouche, Z., Bachmayer, M., Biolchini, A., Bohare, A., Braun, S., Brossa Gonzalo, A., Buonincontri, L., Bursche, A., Calabrese, R., Campora Perez, D. H., Capelli, S., Carbone, A., Cesare, S., Chen, S., Cojocariu, L., Cooke, N., Craik, D. C., Dai, X., Davies, J. E., De Bruyn, K., De Capua, S., Didenko, S., Elashri, M., Fiorini, M., Fleuret, F., Foreman, L. F., Franzoso, E., Fulghesu, T., Gao, Y., Geertsema, R. E., Gligorov, V. V., Haefeli, G., Haimberger, J., Henderson, C., Huang, W., Hutchcroft, D., Jaimes Elles, S. J., Jones, T. P., Juszczak, I., Kautz, J. W., Ketel, T., Kretzschmar, S., Kubat, J., Lane, J. J., Langer, J., Lazzeroni, C., Lesiak, T., Lindner, R., Liu, K., Liu, Y., Ma, G. M., Majewski, M. W., Marks, J., Martinazzoli, L., Materok, M., Mattioli, K. R., Muhammad, E., Mũnoz-Rojas, F., Nogga, P., Padeken, K. O., Passalacqua, B., Pastore, A., Pereima, D., Pham, H., Pietrzyk, G., Pizzichemi, M., Qi, H. R., Raven, G., Reiss, F., Rolf, D. L., Romanovskiy, V., Ruiz Fernandez, R. A., Saitta, B., Sarpis, M., Saur, M., Schmitt, S., Schulte, N., Schulte, S., Simi, G., Skwarnicki, T., Solovyev, I., Stenyakin, O., Strekalina, D., Sun, L., Terentev, A., Van Hulse, C. B., van Veghel, M., Vazquez Regueiro, P., Veltri, M., Vilasis-Cardona, X., Vrahas, C., Wang, X. W., Wang, Y., Wang, Z., Wotton, S. A., Xu, J., Zhao, Y., Zhuo, J.
Format:	Artikel
Sprache:	eng
Schlagworte:	Classical and Quantum Gravitation Collaboration Collisions Elementary Particles Experiments Gluons Hadron-Hadron Scattering Large Hadron Collider Luminosity Mesons Multi-Parton Interactions Pair production Partons Physics Physics and Astronomy Protons QCD Quantum Field Theories Quantum Field Theory Quantum Physics Quarkonium Quarks Regular Article - Experimental Physics Relativity Theory Scattering cross sections Sensors String Theory Transverse momentum
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Zusammenfassung:	A bstract The production cross-section of J/ψ pairs in proton-proton collisions at a centre-of-mass energy of s = 13 TeV is measured using a data sample corresponding to an integrated luminosity of 4 . 2 fb − 1 collected by the LHCb experiment. The measurement is performed with both J/ψ mesons in the transverse momentum range 0 < p T < 14 GeV/ c and rapidity range 2 . 0 < y < 4 . 5. The cross-section of this process is measured to be 16 . 36 ± 0 . 28 (stat) ± 0 . 88 (syst) nb. The contributions from single-parton scattering and double-parton scattering are separated based on the dependence of the cross-section on the absolute rapidity difference ∆ y between the two J/ψ mesons. The effective cross-section of double-parton scattering is measured to be σ eff = 13 . 1 ± 1 . 8 (stat) ± 2 . 3 (syst) mb. The distribution of the azimuthal angle ϕ CS of one of the J/ψ mesons in the Collins-Soper frame and the p T -spectrum of the J/ψ pairs are also measured for the study of the gluon transverse-momentum dependent distributions inside protons. The extracted values of ⟨cos 2 ϕ CS ⟩ and ⟨cos 4 ϕ CS ⟩ are consistent with zero, but the presence of azimuthal asymmetry at a few percent level is allowed.
ISSN:	1029-8479 1126-6708 1029-8479
DOI:	10.1007/JHEP03(2024)088