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.| File | Dimensione | Formato | |
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JHEP03(2024)088.pdf
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