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

The LHCb Collaboration; W. Barter; F. Betti; A. Bohare; P. E. L. Clarke; R. Currie; S. Eisenhardt; K. Farmer; S. Gambetta; Y. Liu; S.E. Mitchell; F. Muheim; M. Needham; F. Oliva; R.H. O'Neil; O. Ozcelik; S. Petrucci; M. Richardson-Slipper; G. Robertson; G. Sarpis; L. Soares Lavra; C. Vrahas; M. R. J. Williams

doi:10.1007/JHEP03(2024)088

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

The LHCb Collaboration
, W. Barter
, F. Betti
, A. Bohare
, P. E. L. Clarke
, R. Currie
, S. Eisenhardt
, K. Farmer
, S. Gambetta
, Y. Liu
, S.E. Mitchell
, F. Muheim
, M. Needham
, F. Oliva
, R.H. O'Neil
, O. Ozcelik
, S. Petrucci
, M. Richardson-Slipper
, G. Robertson
, G. Sarpis

L. Soares Lavra, C. Vrahas, M. R. J. Williams

School of Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

Abstract

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 < 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 difference ∆y between the two J/ψ mesons. The effective cross-section of double-parton scattering is measured to be σeff = 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 transverse-momentum 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.

Original language	English
Article number	88
Pages (from-to)	1-39
Number of pages	39
Journal	Journal of High Energy Physics
Volume	2024
Issue number	3
DOIs	https://doi.org/10.1007/JHEP03(2024)088
Publication status	Published - 14 Mar 2024

Keywords / Materials (for Non-textual outputs)

Hadron-Hadron Scattering
Multi-Parton Interactions
QCD
Quarkonium

Access to Document

10.1007/JHEP03(2024)088Licence: Creative Commons: Attribution (CC-BY)

3 Active
4 Finished

Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/04/23 → 30/09/26
Project: Research
Experimental Particle Physics at the University of Edinburgh
Leonidopoulos, C. (Principal Investigator)
Science and Technology Facilities Council
1/10/22 → 30/09/26
Project: Research
Beautiful Flavours: Discovering New Physics with B-hadrons and Tau-leptons
Barter, W. (Principal Investigator)
UKRI (formerly RCUK)
1/07/22 → 11/08/27
Project: Research

Cite this

The LHCb Collaboration, Barter, W., Betti, F., Bohare, A., Clarke, P. E. L., Currie, R., Eisenhardt, S., Farmer, K., Gambetta, S., Liu, Y., Mitchell, S. E., Muheim, F., Needham, M., Oliva, F., O'Neil, R. H., Ozcelik, O., Petrucci, S., Richardson-Slipper, M., Robertson, G., ... Williams, M. R. J. (2024). 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(3), 1-39. Article 88. https://doi.org/10.1007/JHEP03(2024)088

@article{e25c813a34634ce199e2d328403e064d,

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

abstract = "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 < 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 difference ∆y between the two J/ψ mesons. The effective cross-section of double-parton scattering is measured to be σeff = 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 transverse-momentum 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.",

keywords = "Hadron-Hadron Scattering, Multi-Parton Interactions, QCD, Quarkonium",

author = "\{The LHCb Collaboration\} and W. Barter and F. Betti and A. Bohare and Clarke, \{P. E. L.\} and R. Currie and S. Eisenhardt and K. Farmer and S. Gambetta and Y. Liu and S.E. Mitchell and F. Muheim and M. Needham and F. Oliva and R.H. O'Neil and O. Ozcelik and S. Petrucci and M. Richardson-Slipper and G. Robertson and G. Sarpis and Lavra, \{L. Soares\} and C. Vrahas and Williams, \{M. R. J.\}",

year = "2024",

month = mar,

day = "14",

doi = "10.1007/JHEP03(2024)088",

language = "English",

volume = "2024",

pages = "1--39",

journal = "Journal of High Energy Physics",

issn = "1126-6708",

publisher = "Springer",

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}

The LHCb Collaboration, Barter, W, Betti, F, Bohare, A, Clarke, PEL , Currie, R , Eisenhardt, S, Farmer, K, Gambetta, S, Liu, Y, Mitchell, SE, Muheim, F , Needham, M , Oliva, F, O'Neil, RH, Ozcelik, O, Petrucci, S, Richardson-Slipper, M, Robertson, G, Sarpis, G, Lavra, LS, Vrahas, C & Williams, MRJ 2024, '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, vol. 2024, no. 3, 88, pp. 1-39. https://doi.org/10.1007/JHEP03(2024)088

TY - JOUR

T1 - Measurement of J/ψ-pair production in pp collisions at √s = 13 TeV and study of gluon transverse-momentum dependent PDFs

AU - The LHCb Collaboration

AU - Barter, W.

AU - Betti, F.

AU - Bohare, A.

AU - Clarke, P. E. L.

AU - Currie, R.

AU - Eisenhardt, S.

AU - Farmer, K.

AU - Gambetta, S.

AU - Liu, Y.

AU - Mitchell, S.E.

AU - Muheim, F.

AU - Needham, M.

AU - Oliva, F.

AU - O'Neil, R.H.

AU - Ozcelik, O.

AU - Petrucci, S.

AU - Richardson-Slipper, M.

AU - Robertson, G.

AU - Sarpis, G.

AU - Lavra, L. Soares

AU - Vrahas, C.

AU - Williams, M. R. J.

PY - 2024/3/14

Y1 - 2024/3/14

N2 - 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 < 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 difference ∆y between the two J/ψ mesons. The effective cross-section of double-parton scattering is measured to be σeff = 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 transverse-momentum 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.

AB - 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 < 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 difference ∆y between the two J/ψ mesons. The effective cross-section of double-parton scattering is measured to be σeff = 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 transverse-momentum 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.

KW - Hadron-Hadron Scattering

KW - Multi-Parton Interactions

KW - QCD

KW - Quarkonium

U2 - 10.1007/JHEP03(2024)088

DO - 10.1007/JHEP03(2024)088

M3 - Article

SN - 1126-6708

VL - 2024

SP - 1

EP - 39

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

IS - 3

M1 - 88

ER -

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

Abstract

Keywords / Materials (for Non-textual outputs)

Access to Document

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Projects

Experimental Particle Physics at the University of Edinburgh

Experimental Particle Physics at the University of Edinburgh

Beautiful Flavours: Discovering New Physics with B-hadrons and Tau-leptons

Cite this