Nuclear suppression from coherent $J/\psi$ photoproduction at the Large Hadron Collider

Abstract

Using the data on coherent $J/\psi$ photoproduction in Pb-Pb ultraperipheral collisions (UPCs) obtained in Runs 1 and 2 at the Large Hadron Collider (LHC), we determined with a good accuracy the nuclear suppression factor of $S_{Pb}(x)$ in a wide range of the momentum fraction $x$, $10^{-5}\le x\le 0.04$. In the small-$x$ region $x<10^{-3}$, our ${\chi }^2$ fit favors a flat form of $S_{Pb}(x)\approx 0.6$ with approximately a 5% accuracy for $x=6\times 10^{-4}-10^{-3}$ and a 25% error at $x=10^{-4}$. At the same time, uncertainties of the fit do not exclude a slow decrease of $S_{Pb}(x)$ in the small-$x$ limit. At large $x$, $S_{Pb}(x)$ is constrained to better than 10% precision up to $x=0.04$ and is also consistent with the value of $S_{Pb}(x)$ at $⟨x⟩=0.042$, which we extract from the Fermilab data on the $A$ dependence of the cross section of coherent $J/\psi$ photoproduction on fixed nuclear targets. The resulting uncertainties on $S_{Pb}(x)$ are small, which indicates the potential of the LHC data on coherent charmonium photoproduction in Pb-Pb UPCs to provide additional constraints on small-$x$ nPDFs. We explicitly demonstrate this using as an example the EPPS16 and nCTEQ16 nuclear parton distribution functions, whose uncertainties decrease severalfold after the Bayesian reweighting of the discussed UPC data.

arXiv comment18 pages, 3 figures, 3 tables. Revised and extended version including the Run 2 ALICE data at central rapidities and the effect of Bayesian reweighting of the UPC data on EPPS16 and nCTEQ15 nPDFs

References in corpus (61)

• The Color Glass Condensate
• A Large Hadron Electron Collider at CERN: Report on the Physics and Design Concepts for Machine and Detector
• The Physics of Ultraperipheral Collisions at the LHC
• EPPS16: Nuclear parton distributions with LHC data
• nCTEQ15 - Global analysis of nuclear parton distributions with uncertainties in the CTEQ framework
• Physics of Ultra-Peripheral Nuclear Collisions
• Determination of nuclear parton distribution functions and their uncertainties at next-to-leading order
• Exclusive photoproduction of J/psi mesons at HERA
• Nuclear parton distributions at next to leading order
• Elastic J/Psi Production at HERA
• Global Analysis of Nuclear Parton Distributions
• Charmonium and $e^{+}{e}^{-}$ pair photoproduction at mid-rapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=2.76 TeV
• Off-diagonal distributions fixed by diagonal partons at small $x$ and $\xi$
• Gluon saturation and initial conditions for relativistic heavy ion collisions
• Coherent J/$\psi$ photoproduction in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Hard diffractive electroproduction of vector mesons in QCD
• Nuclear Deep-Inelastic Lepton Scattering and Coherence Phenomena
• Leading twist nuclear shadowing phenomena in hard processes with nuclei
• Updated measurements of exclusive $J/\psi$ and $\psi (2S)$ production cross-sections in $pp$ collisions at $\sqrt{s}=7$ TeV
• Interference in Exclusive Vector Meson Production in Heavy Ion Collisions
• Coherent J/psi photoproduction in ultra-peripheral PbPb collisions at sqrt(s[NN]) = 2.76 TeV with the CMS experiment
• Gluon Shadowing in Heavy-Flavor Production at the LHC
• PDF reweighting in the Hessian matrix approach
• J/Psi production in ultraperipheral Pb+Pb and p+Pb collisions at energies available at the CERN Large Hadron Collider
• Diffractive Heavy Quarkonium Photo- and Electroproduction in QCD
• Exclusive photoproduction of a heavy vector meson in QCD
• Global analysis of nuclear parton distribution functions and their uncertainties at next-to-next-to-leading order
• 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
• Nuclear Parton Distributions from Lepton-Nucleus Scattering and the Impact of an Electron-Ion Collider
• 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
• In depth analysis of the combined HERA data in the dipole models with and without saturation
• Central exclusive production of $J/\psi$ and $\psi (2S)$ mesons in $pp$ collisions at $\sqrt{s}=13$TeV
• Mutual heavy ion dissociation in peripheral collisions at ultrarelativistic energies
• Relativistic corrections to the vector meson light front wave function
• Coherent $J/\psi$ and ${\psi }^{\prime }$ photoproduction at midrapidity in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Wavefunction corrections and off-forward gluon distributions in diffractive J/psi electroproduction
• Disentangling coherent and incoherent quasielastic $J/\psi$ photoproduction on nuclei by neutron tagging in ultraperipheral ion collisions at the LHC
• Investigation of diffractive photoproduction of $J/\Psi$ in hadronic collisions
• Exclusive $J/\psi$ and ${\rm Y}$ photoproduction and the low $x$ gluon
• Fading out of J/psi color transparency in high energy heavy ion peripheral collisions
• Non-quadratic improved Hessian PDF reweighting and application to CMS dijet measurements at 5.02 TeV
• Nuclear Structure Functions at Small x from Inelastic Shadowing and Diffraction
• Small $x$ gluon shadowing from LHC data on coherent $J/\psi$ photoproduction
• Investigating saturation effects in ultraperipheral collisions at the LHC with the color dipole model
• Probing the small-$x$ nuclear gluon distributions with isolated photons at forward rapidities in p+Pb collisions at the LHC
• An analysis of the impact of LHC Run I proton-lead data on nuclear parton densities
• Vector boson production in proton-lead and lead-lead collisions at the LHC and its impact on nCTEQ15 PDFs
• A perturbative QCD study of dijets in p+Pb collisions at the LHC
• Inclusive dijet photoproduction in ultraperipheral heavy-ion collisions at the CERN LHC in next-to-leading order QCD
• Coherent photoproduction of $J/\psi$ in nucleus-nucleus collisions in the color dipole approach
• Diffractive dijet photoproduction in ultraperipheral collisions at the LHC in next-to-leading order QCD
• Saturation and forward jets in proton-lead collisions at the LHC
• Constraints on nuclear parton distributions from dijet photoproduction at the LHC
• Bayesian reweighting of nuclear PDFs and constraints from proton-lead collisions at the LHC
• $D$-wave effects in diffractive electroproduction of heavy quarkonia from the photon-like $V\to Q\bar{Q}$ transition
• Probing coherent charmonium photoproduction off light nuclei at medium energies
• Ultra-peripheral nuclear collisions as a source of heavy quarkonia
• Diffraction at HERA, Color Opacity and Nuclear Shadowing
• Cross Section Oscillations in the Coherent Charmonium Photoproduction off Nuclei at Moderate Energies

Cited by in corpus (25)

• Heavy quarks and jets as probes of the QGP
• 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
• Diffractive semi-hard production of a $J/\psi$ or a ${\rm Y}$ from single-parton fragmentation plus a jet in hybrid factorization
• High-energy emissions of light mesons plus heavy flavor at the LHC and the Forward Physics Facility
• Energy dependent nuclear suppression from gluon saturation in exclusive vector meson production
• Selected topics in diffraction with protons and nuclei: past, present, and future
• Mueller-Navelet jets at the LHC: hunting data with azimuthal distributions
• Next-to-leading order perturbative QCD predictions for exclusive $J/\psi$ photoproduction in oxygen-oxygen and lead-lead collisions at the LHC
• Vector quarkonia at the LHC with JETHAD: A high-energy viewpoint
• Deep-inelastic electron-deuteron scattering with spectator nucleon tagging at the electron-ion collider. Extracting free nucleon structure
• Emergence of high-energy dynamics from cascade-baryon detections at the LHC
• A journey into the proton structure: Progresses and challenges
• Photoproduction of low-$p_{\mathrm{T}}$ J/$\psi$ from peripheral to central Pb$-$Pb collisions at 5.02 TeV
• Challenges to the Good-Walker paradigm in coherent and incoherent photoproduction
• Gluon Saturation Effects in Exclusive Heavy Vector Meson Photoproduction
• Measurement of exclusive $J/\psi$ and $\psi (2S)$ production at $\sqrt{s}=13$ TeV
• New opportunities at the photon energy frontier
• Regge phenomenology and coherent photoproduction of charmonium in peripheral heavy ion collisions
• Coherent $J/\psi$ electroproduction on ${}^4$He and ${}^3$He at the Electron-Ion Collider: probing nuclear shadowing one nucleon at a time
• Photoproduction of $J/\psi$ in d+Au ultraperipheral collisions at the BNL Relativistic Heavy Ion Collider
• Gluon imaging using azimuthal correlations in diffractive scattering at the Electron-Ion Collider
• Analysis of $J/\psi$ and $\psi (2S)$ Charmonium Production in Ultraperipheral Lead-Lead and Proton-Lead Collisions at LHC Energies
• Coherent photoproduction of ${\rho }^0,\omega$ and excited vector mesons in ultraperipheral PbPb collisions
• The reggeometric pomeron and exclusive production of $J/\psi$ and $\psi (2S)$ in ultraperipheral collisions at the LHC