Coherent $J/\psi$ and ${\psi }^{\prime }$ photoproduction at midrapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV

Abstract

The coherent photoproduction of $J/\psi$ and ${\psi }^{\prime }$ mesons was measured in ultra-peripheral Pb-Pb collisions at a center-of-mass energy $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV with the ALICE detector. Charmonia are detected in the central rapidity region for events where the hadronic interactions are strongly suppressed. The $J/\psi$ is reconstructed using the dilepton ($l^{+}{l}^{-}$) and proton-antiproton decay channels, while for the ${\psi }^{\prime }$, the dilepton and the $l^{+}{l}^{-}{\pi }^{+}{\pi }^{-}$ decay channels are studied. The analysis is based on an event sample corresponding to an integrated luminosity of about 233 ${\mu b}^{-1}$. The results are compared with theoretical models for coherent $J/\psi$ and ${\psi }^{\prime }$ photoproduction. The coherent cross section is found to be in a good agreement with models incorporating moderate nuclear gluon shadowing of about 0.65 at a Bjorken-$x$ of around $6\times 10^{-4}$, such as the EPS09 parametrization, however none of the models is able to fully describe the rapidity dependence of the coherent $J/\psi$ cross section including ALICE measurements at forward rapidity. The ratio of ${\psi }^{\prime }$ to $J/\psi$ coherent photoproduction cross sections was also measured and found to be consistent with the one for photoproduction off protons.

arXiv comment29 pages, 6 captioned figures, 4 tables, authors from page 23, published version, figures at http://alice-publications.web.cern.ch/node/6778

References in corpus (43)

• Performance of the ALICE Experiment at the CERN LHC
• EPS09 - a New Generation of NLO and LO Nuclear Parton Distribution Functions
• The ALICE TPC, a large 3-dimensional tracking device with fast readout for ultra-high multiplicity events
• The Physics of Ultraperipheral Collisions at the LHC
• nCTEQ15 - Global analysis of nuclear parton distributions with uncertainties in the CTEQ framework
• EPPS16: Nuclear parton distributions with LHC data
• Physics of Ultra-Peripheral Nuclear Collisions
• Performance of the ALICE VZERO system
• Exclusive Vector Meson Production in Relativistic Heavy Ion Collisions
• Alignment of the ALICE Inner Tracking System with cosmic-ray tracks
• Exclusive photoproduction of J/psi mesons at HERA
• STARlight: A Monte Carlo simulation program for ultra-peripheral collisions of relativistic ions
• Charmonium and $e^{+}{e}^{-}$ pair photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=2.76 TeV
• Nuclear shadowing
• Coherent J/$\psi$ photoproduction in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Leading twist nuclear shadowing phenomena in hard processes with nuclei
• LHC Forward Physics
• Coherent J/psi photoproduction in ultra-peripheral PbPb collisions at sqrt(s[NN]) = 2.76 TeV with the CMS experiment
• J/Psi production in ultraperipheral Pb+Pb and p+Pb collisions at energies available at the CERN Large Hadron Collider
• Incoherent diffractive J/Psi-production in high energy nuclear DIS
• Imaging the nucleus with high-energy photons
• Measurement of the cross section for electromagnetic dissociation with neutron emission in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV
• Evidence for nuclear gluon shadowing from the ALICE measurements of PbPb ultraperipheral exclusive J/ψ production
• Coherent and incoherent $J/\psi$ photonuclear production in an energy-dependent hot-spot model
• Diffractive Photoproduction of Psi(2S) Mesons at HERA
• Energy dependence of dissociative $J/\psi$ photoproduction as a signature of gluon saturation at the LHC
• Exclusive J/ψ production in ultraperipheral collisions at the LHC: constrains on the gluon distributions in the proton and nuclei
• Coherent J/$\psi$ photoproduction at forward rapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Central exclusive production of $J/\psi$ and $\psi (2S)$ mesons in $pp$ collisions at $\sqrt{s}=13$TeV
• Coherent photoproduction of vector mesons in heavy ion ultraperipheral collisions: Update for run 2 at the CERN Large Hadron Collider
• nNNPDF2.0: Quark Flavor Separation in Nuclei from LHC Data
• Psi(2S) -> pi^+ pi^- J/psi Decay Distributions
• Investigation of diffractive photoproduction of $J/\Psi$ in hadronic collisions
• Coherent rho and J/psi photoproduction in ultraperipheral processes with electromagnetic dissociation of heavy ions at RHIC and LHC
• Theoretical uncertainties in exclusive electroproduction S-wave heavy quarkonia
• Coherent $\psi$(2S) photo-production in ultra-peripheral Pb-Pb collisions at ${\sqrt{s}}_{\mathrm{NN}}$ = 2.76 TeV
• Small $x$ gluon shadowing from LHC data on coherent $J/\psi$ photoproduction
• Diffractive photoproduction of radially excited psi(2S) mesons in photon-Pomeron reactions in PbPb collisions at the CERN LHC
• Coherent photoproduction of $J/\psi$ in nucleus-nucleus collisions in the color dipole approach
• Photonuclear $J/\psi$ production at the LHC: proton-based versus nuclear dipole scattering amplitudes
• Nucleon dissociation and incoherent $J/\psi$ photoproduction on nuclei in ion ultraperipheral collisions at the CERN Large Hadron Collider
• On theoretical uncertainty of color dipole phenomenology in the J/Psi and Upsilon photoproduction in pA and AA collisions at the CERN Large Hadron Collider
• D-wave effects in heavy quarkonium production in ultraperipheral nuclear collisions

Cited by in corpus (26)

• The ALICE experiment: a journey through QCD
• Exclusive $J/\psi$ photoproduction in ultraperipheral Pb+Pb collisions at the LHC to next-to-leading order perturbative QCD
• Probing small Bjorken-$x$ nuclear gluonic structure via coherent J/$\psi$ photoproduction in ultraperipheral PbPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Nuclear suppression from coherent $J/\psi$ photoproduction at the Large Hadron Collider
• Properties of the QCD Matter: A Review of Selected Results from the ALICE Experiment
• Energy dependent nuclear suppression from gluon saturation in exclusive vector meson production
• Selected topics in diffraction with protons and nuclei: past, present, and future
• Next-to-leading order perturbative QCD predictions for exclusive $J/\psi$ photoproduction in oxygen-oxygen and lead-lead collisions at the LHC
• Investigation of the background in coherent $J/\psi$ production at the EIC
• Light-front wavefunctions of mesons by design
• Strong Interaction Physics at the Luminosity Frontier with 22 GeV Electrons at Jefferson Lab
• Observation of strong nuclear suppression in exclusive $J/\psi$ photoproduction in Au$+$Au ultra-peripheral collisions at RHIC
• Challenges to the Good-Walker paradigm in coherent and incoherent photoproduction
• First measurement of the $|t|$-dependence of incoherent J/$\psi$ photonuclear production
• Exclusive $J/\psi$, $\psi (2s)$, and $e^{+}{e}^{-}$ pair production in Au$+$Au ultra-peripheral collisions at RHIC
• Exploring Baryon Resonances with Transition Generalized Parton Distributions: Status and Perspectives
• Novel Cross Section Ratios as Possible Signals of Saturation in UPCs
• Photoproduction of K${}^{+}$K${}^{-}$ pairs in ultra-peripheral collisions
• Measurement of exclusive $J/\psi$ and $\psi (2S)$ production at $\sqrt{s}=13$ TeV
• Probing gluon fluctuations in nuclei with the first energy-dependent measurement of incoherent J/$\psi$ photoproduction in ultraperipheral PbPb collisions
• Physics with high-luminosity proton-nucleus collisions at the LHC
• Coherent photo- and electroproduction of charmonia on nuclear targets revisited: Green function formalism
• Nuclear deformation effects in photoproduction of $\rho$ mesons in ultraperipheral isobaric collisions
• Observation of coherent $\varphi$(1020) meson photoproduction in ultraperipheral PbPb collisions at $\sqrt{s_{\text{NN}}}$ = 5.36 TeV
• Probing the gluonic structure of the deuteron with $J/\psi$ photoproduction in d+Au ultra-peripheral collisions
• The reggeometric pomeron and exclusive production of $J/\psi$ and $\psi (2S)$ in ultraperipheral collisions at the LHC