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Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/222017
Measurement of J/ψ-pair production in pp collisions at √s = 13 TeV and study of gluon transverse-momentum dependent PDFs
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The production cross-section of J/ψ pairs in proton-proton collisions at a centreof-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 < pT < 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 diference ∆y between the two J/ψ mesons. The efective cross-section of double-parton scattering is measured to be σef = 13.1 ± 1.8 (stat) ± 2.3 (syst) mb. The distribution of the azimuthal angle ϕCS of one of the J/ψ mesons in the Collins-Soper frame and the pT-spectrum of the J/ψ pairs are also measured for the study of the gluon transversemomentum dependent distributions inside protons. The extracted values of ⟨cos 2ϕCS⟩ and ⟨cos 4ϕCS⟩ are consistent with zero, but the presence of azimuthal asymmetry at a few percent level is allowed.
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COMERMA MONTELLS, Albert, et al. Measurement of J/ψ-pair production in pp collisions at √s = 13 TeV and study of gluon transverse-momentum dependent PDFs . Journal of High Energy Physics. 2024. Vol. 2024, num. 88. ISSN 1126-6708. [consulted: 18 of August of 2026]. Available at: https://hdl.handle.net/2445/222017