The energy dependence of exclusive heavy vector meson photoproduction cross-sections and NLO BFKL evolution

Abstract

We study the energy dependence of the cross-section for exclusive photoproduction of vector mesons $J/\psi$ and ${\rm Y}$, using a solution to the next-to-leading order (NLO) Balitsky-Fadin-Kuraev-Lipatov (BFKL) equation. Our goal is to use BFKL evolution as a benchmark to provide evidence for the presence of non-linear QCD dynamics and signs for the onset of gluon saturation at highest center of mass energies. Our approach determines initial conditions for the proton from the Bartels-Golec Biernat-Kowalski (BGK) dipole model, and evolves the resulting unintegrated gluon distribution using NLO BFKL evolution. For the nucleus, initial conditions are generated through both the impact parameter dependent saturation model (IP-Sat), using a Wood-Saxon distribution, and a $A^{1/3}$ scaling of the saturation scale of the original BGK model. We find that NLO BFKL evolution provides a very good description of the nuclear modification factor for $J/\psi$ production, if initial conditions are generated through a $A^{1/3}$ scaled BGK model, while the description fails, if initial conditions are created using the IP-Sat model.

arXiv comment22 pages, 13 figures, version accepted for publication in Physical Review D

References in corpus (61)

• Operator expansion for high-energy scattering
• Small-x F_2 Structure Function of a Nucleus Including Multiple Pomeron Exchanges
• Nonlinear Gluon Evolution in the Color Glass Condensate: I
• Nonlinear Gluon Evolution in the Color Glass Condensate: II
• The Renormalization Group Equation for the Color Glass Condensate
• Unitarity at small Bjorken x
• The Wilson renormalization group for low x physics: Gluon evolution at finite parton density
• An Impact Parameter Dipole Saturation Model
• Exclusive diffractive processes at HERA within the dipole picture
• A Modification of the Saturation Model: DGLAP evolution
• Exclusive photoproduction of J/psi mesons at HERA
• Elastic J/Psi Production at HERA
• Exclusive electroproduction of J/psi mesons at HERA
• Elastic Photoproduction of J/psi and Upsilon Mesons at HERA
• Scanning the BFKL pomeron in elastic production of vector mesons at HERA
• Mining for Gluon Saturation at Colliders
• Exclusive vector meson production at high energies and gluon saturation
• The azimuthal decorrelation of jets widely separated in rapidity as a test of the BFKL kernel
• Imaging the nucleus with high-energy photons
• Snowmass 2021 whitepaper: Proton structure at the precision frontier
• Evidence for nuclear gluon shadowing from the ALICE measurements of PbPb ultraperipheral exclusive J/ψ production
• The hard to soft Pomeron transition in small x DIS data using optimal renormalization
• Exclusive photoproduction of {\bf ${\rm Y}$} mesons at HERA
• Measurement of the exclusive ${\rm Y}$ production cross-section in $pp$ collisions at $\sqrt{s}=$7 TeV and 8 TeV
• The effect of NLO conformal spins in azimuthal angle decorrelation of jet pairs
• Central exclusive production of $J/\psi$ and $\psi (2S)$ mesons in $pp$ collisions at $\sqrt{s}=13$TeV
• Description of F2 and FL at small x using a collinearly-improved BFKL resummation
• In depth analysis of the combined HERA data in the dipole models with and without saturation
• Energy dependence of exclusive $J/\psi$ photoproduction off protons in ultra-peripheral p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Interaction of small size wave packet with hadron target
• BFKL evolution and the growth with energy of exclusive J/Psi and Upsilon photo-production cross-sections
• Saturation model of DIS : an update
• First measurement of the $|\text{t}|$-dependence of coherent $J/\psi$ photonuclear production
• Forward Drell-Yan production at the LHC in the BFKL formalism with collinear corrections
• High-Energy QCD Asymptotics of Photon-Photon Collisions
• 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
• Theoretical uncertainties in exclusive electroproduction S-wave heavy quarkonia
• Exclusive ${\rm Y}$ photoproduction in hadronic collisions at CERN LHC energies
• Exclusive J/Psi and Psi(2s) photo-production as a probe of QCD low x evolution equations
• Collinearly improved kernel suppresses Coulomb tails in the impact-parameter dependent Balitsky-Kovchegov evolution
• 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
• Single bottom quark production in kT-factorisation
• Diffractive upsilon production at the LHC
• Energy dependence of coherent photonuclear production of J/$\psi$ mesons in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$=5.02 TeV
• Photonuclear $J/\psi$ production at the LHC: proton-based versus nuclear dipole scattering amplitudes
• Energy dependent nuclear suppression from gluon saturation in exclusive vector meson production
• Selected topics in diffraction with protons and nuclei: past, present, and future
• Unintegrated gluon distributions from the color dipole cross section in the BGK saturation model
• Systematic analysis of the proton mass radius based on photoproduction of vector charmoniums
• Coherent and incoherent vector meson electroproduction in the future electron-ion colliders: the hot-spot predictions
• Finite-size effects on small-$x$ evolution and saturation in proton and nuclear targets
• Exclusive and dissociative J/$\psi$ photoproduction, and exclusive dimuon production, in p$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=8.16$ TeV
• Gluon Saturation Effects in Exclusive Heavy Vector Meson Photoproduction
• Measurement of exclusive $J/\psi$ and $\psi (2S)$ production at $\sqrt{s}=13$ TeV
• Vector meson photoproduction in UPCs with FoCal
• Exclusive quarkonium photoproduction: predictions with the Balitsky-Kovchegov equation including the full impact-parameter dependence
• Contribution of the non-linear term in the Balitsky-Kovchegov equation to the nuclear structure functions
• Exclusive $\rho$ and $J/\Psi$ photoproduction in ultraperipheral $pO$ and $OO$ collisions at energies available at the CERN Large Hadron Collider
• Impact-parameter-dependent solutions to the Balitsky-Kovchegov equation at next-to-leading order

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