Central exclusive production of $J/\psi$ and $\psi (2S)$ mesons in $pp$ collisions at $\sqrt{s}=13$TeV

Abstract

Measurements are reported of the central exclusive production of \jpsi and \psitwos mesons in $pp$ collisions at a centre-of-mass energy of 13 TeV. Backgrounds are significantly reduced compared to previous measurements made at lower energies through the use of new forward shower counters. The products of the cross-sections and the branching fractions for the decays to dimuons, where both muons are within the pseudorapidity range $2.0<\eta <4.5$, are measured to be $$\begin{array}{rcl}{\sigma }_{J/\psi \to {\mu }^{+}{\mu }^{-}}& =& 435\pm 18\pm 17\pm 16\mathrm{pb},\\ {\sigma }_{\psi (2S)\to {\mu }^{+}{\mu }^{-}}& =& 11.1\pm 1.1\pm 0.3\pm 0.4\mathrm{pb}.\end{array}$$ The first uncertainties are statistical, the second are systematic, and the third are due to the luminosity determination. The cross-sections are also measured differentially for meson rapidities between 2.0 and 4.5. Good agreement is observed with theoretical predictions. Photoproduction cross-sections are derived and compared to previous experiments, and a deviation from a pure power-law extrapolation of lower energy data is observed.

arXiv commentAll figures and tables, and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2018-011.html

References in corpus (12)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• LHCb Detector Performance
• Exclusive photoproduction of J/psi mesons at HERA
• Elastic J/Psi Production at HERA
• Precision luminosity measurements at LHCb
• Central Exclusive Particle Production at High Energy Hadron Colliders
• Exclusive vector meson production at HERA
• Exclusive physics at the LHC with SuperChic 2
• The HeRSCheL detector: high-rapidity shower counters for LHCb
• Predictions of exclusive psi(2S) production at the LHC
• Exclusive heavy vector meson photoproduction in hadronic collisions at the LHC: predictions of the Color Glass Condensate model for Run 2 energies

Cited by in corpus (39)

• The ALICE experiment: a journey through QCD
• Coherent J/$\psi$ photoproduction at forward rapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Coherent $J/\psi$ and ${\psi }^{\prime }$ photoproduction at midrapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Measurement of exclusive ${\rm Y}$ photoproduction from protons in pPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• QCD evolution based evidence for the onset of gluon saturation in exclusive photo-production of vector mesons
• Observation and measurement of forward proton scattering in association with lepton pairs produced via the photon fusion mechanism at ATLAS
• Exclusive J/Psi and Psi(2s) photo-production as a probe of QCD low x evolution equations
• Exclusive $J/\psi$ photoproduction in ultraperipheral Pb+Pb collisions at the LHC to next-to-leading order perturbative QCD
• How to include exclusive $J/\psi$ production data in global PDF analyses
• Nuclear suppression from coherent $J/\psi$ photoproduction at the Large Hadron Collider
• Very low $x$ gluon density determined by LHCb exclusive $J/\psi$ data
• Coherent photoproduction of $J/\psi$ in nucleus-nucleus collisions in the color dipole approach
• Energy dependent nuclear suppression from gluon saturation in exclusive vector meson production
• Selected topics in diffraction with protons and nuclei: past, present, and future
• Systematic analysis of the proton mass radius based on photoproduction of vector charmoniums
• Measurement of the central exclusive production of charged particle pairs in proton-proton collisions at $\sqrt{s}=200$ GeV with the STAR detector at RHIC
• Prospects for quarkonium studies at the high-luminosity LHC
• Finite-size effects on small-$x$ evolution and saturation in proton and nuclear targets
• Exclusive photoproduction of excited quarkonia in ultraperipheral collisions
• The ${\psi }^{(\ast )}p$ scattering length based on near-threshold charmoniums photoproduction
• Heavy quarkonia production at LHC and EIC using Basis Light-Front Quantization wavefunctions
• Challenges to the Good-Walker paradigm in coherent and incoherent photoproduction
• Exclusive and dissociative J/$\psi$ photoproduction, and exclusive dimuon production, in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV
• Momentum transfer squared dependence of exclusive quarkonia photoproduction in UPCs
• Measurement of the production cross-section of $J/\psi$ and $\psi (2$S$)$ mesons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector
• Exploring Baryon Resonances with Transition Generalized Parton Distributions: Status and Perspectives
• Azimuthal correlations within exclusive dijets with large momentum transfer in photon-lead collisions
• Asymptotic gluon density within the color dipole picture in the light of HERA high-precision data
• Global Bayesian Analysis of $\mathrm{J}/\psi$ Photoproduction on Proton and Lead Targets
• Measurement of exclusive $J/\psi$ and $\psi (2S)$ production at $\sqrt{s}=13$ TeV
• Exclusive quarkonium photoproduction: predictions with the Balitsky-Kovchegov equation including the full impact-parameter dependence
• Observation of exotic $J/\psi \varphi$ resonant structure in diffractive processes in proton-proton collisions
• Exclusive diffractive J/psi and Psi(2S) production in dipole model using a holographic AdS/QCD light front wavefunction with longitudinal confinement
• Measurement of the near-threshold J$/\psi$ photoproduction cross section with the CLAS12 experiment
• The energy dependence of exclusive heavy vector meson photoproduction cross-sections and NLO BFKL evolution
• Physics with high-luminosity proton-nucleus collisions at the LHC
• Determination of the HERA coherent diffractive $J/\psi$ production cross section via artificial neural network
• Probing nuclear structure with the Balitsky-Kovchegov equation in full impact-parameter dependence
• Predictions of exclusive ${\rm Y}$ photoproduction at the LHC and future colliders