Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/222017
Title: Measurement of J/ψ-pair production in pp collisions at √s = 13 TeV and study of gluon transverse-momentum dependent PDFs 
Author: Comerma Montells, Albert
Garcia Moreno, Paula
Garrido Beltrán, Lluís
Gioventù, Alessandra
Gironella Gironell, Pere
Gomez Fernandez, Sergio
Graugés Pous, Eugeni
Lobo Salvia, Aniol
López Huertas, Albert
Manera Escalero, Rafel
Marin Benito, Carla
Mauricio Ferre, Joan
Alfonso Albero, Alejandro
Vazquez Gomez, Ricardo
LHCb Collaboration
Keywords: Física de partícules
Cromodinàmica quàntica
Hadrons
Particle physics
Quantum chromodynamics
Hadrons
Issue Date: 2024
Publisher: Springer Verlag
Abstract: 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.
Note: Reproducció del document publicat a: https://doi.org/10.1007/JHEP03(2024)088
It is part of: Journal of High Energy Physics, 2024, vol. 2024, num.88
URI: https://hdl.handle.net/2445/222017
Related resource: https://doi.org/10.1007/JHEP03(2024)088
ISSN: 1126-6708
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)
Articles publicats en revistes (Institut de Ciències del Cosmos (ICCUB))

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