Abstract
Using the charmonium light-front wavefunctions obtained by diagonalizing an effective Hamiltonian with the one-gluon exchange interaction and a confining potential inspired by light-front holography in the basis light-front quantization formalism, we compute production of charmonium states in diffractive deep inelastic scattering and ultra-peripheral heavy ion collisions within the dipole picture. Our method allows us to predict yields of all vector charmonium states below the open flavor thresholds in high-energy deep inelastic scattering, proton–nucleus and ultra-peripheral heavy ion collisions, without introducing any new parameters in the light-front wavefunctions. The obtained charmonium cross section is in reasonable agreement with experimental data at HERA, RHIC and LHC. We observe that the cross-section ratio σΨ(2s)/σJ/Ψ reveals significant independence of model parameters.
Highlights
Exclusive vector meson production in diffractive deep inelastic scattering (DIS) and deeply virtual Compton scattering (DVCS) are effective tools for studying Quantum Chromodynamics (QCD) [1]
Models incorporating saturation physics successfully describe the high precision data harvested at the Hadron–Electron Ring Accelerator (HERA) [4,5,6,7,8,9] and are instrumental for deriving predictions for future experiments at the Large Hadron electron Collider (LHeC) [10] and the Electron–Ion Collider (EIC) [11]
We study diffractive charmonium production with a theoretical light-front wavefunction (LFWF) obtained from the basis light-front quantization approach
Summary
Exclusive vector meson production in diffractive deep inelastic scattering (DIS) and deeply virtual Compton scattering (DVCS) are effective tools for studying Quantum Chromodynamics (QCD) [1] At low x these processes are dominated by gluon saturation [2,3]. Recent progress in the basis light-front quantization (BLFQ) approach [16,17,18,19,20] has paved an avenue for improving the understanding of the heavy quarkonium system It has enabled the computation of the LFWFs for any heavy quarkonium state and calculate the corresponding diffractive cross sections. The main goal of this letter is to employ the theoretically sound and phenomenologically-constrained BLFQ wavefunctions to compute the diffractive cross sections for the heavy quarkonium production at low x using the dipole model to take into account the gluon saturation
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