The production cross-section of J/Psi pairs in proton-proton collisions at a centre-of-mass energy of sqrt{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 /pm 0.28 (stat) \pm 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 Deltay between the two J/Psi mesons. The effective cross-section of double-parton scattering is measured to be sigma_eff = 13.1 \pm 1.8 (stat) \pm 2.3 (syst) mb. The distribution of the azimuthal angle phi_CS of one of the J/Psi mesons in the Collins-Soper frame and the pT-spectrum of the J/Psi pairs are also measured for the study of the gluon transverse-momentum dependent distributions inside protons. The extracted values of and are consistent with zero, but the presence of azimuthal asymmetry at a few percent level is allowed.

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

Bassi G.
Membro del Collaboration Group
;
Kleijne N.
Membro del Collaboration Group
;
Morello M. J.
Membro del Collaboration Group
;
Passaro D.
Membro del Collaboration Group
;
Pica L.
Membro del Collaboration Group
;
Ribatti R.
Membro del Collaboration Group
;
Riccardi D.
Membro del Collaboration Group
;
2024

Abstract

The production cross-section of J/Psi pairs in proton-proton collisions at a centre-of-mass energy of sqrt{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 /pm 0.28 (stat) \pm 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 Deltay between the two J/Psi mesons. The effective cross-section of double-parton scattering is measured to be sigma_eff = 13.1 \pm 1.8 (stat) \pm 2.3 (syst) mb. The distribution of the azimuthal angle phi_CS of one of the J/Psi mesons in the Collins-Soper frame and the pT-spectrum of the J/Psi pairs are also measured for the study of the gluon transverse-momentum dependent distributions inside protons. The extracted values of and are consistent with zero, but the presence of azimuthal asymmetry at a few percent level is allowed.
Measurement of J/ψ-pair production in pp collisions at √s=13 TeV and study of gluon transverse-momentum dependent PDFs
2024
Settore FIS/01 - Fisica Sperimentale
Settore PHYS-01/A - Fisica sperimentale delle interazioni fondamentali e applicazioni
Hadron-Hadron Scattering; Multi-Parton Interactions; QCD; Quarkonium; Double parton scatterings; Matrix-element; Helac-onia; Generator
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11384/154005
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