Diffractive Vector-Meson Production from the Light-Front Quark Model
Abstract
We study exclusive diffractive electroproduction of the ρ0, ϕ, J/ψ, and ψ(2S) mesons in the color-dipole picture using two spin-orbit light-front wave functions, S-1 and S-2. S-1 follows from the Melosh--Wigner rotation in the light-front quark model (LFQM), while S-2 is the spin-improved form commonly used in holographic and boosted-Gaussian approaches. Both share the same radial wave function, with their parameters determined from the LFQM Hamiltonian. The color-glass-condensate dipole parameters are fixed from inclusive structure-function data, with no fit to diffractive data. We compare the predictions with measurements of cross sections, R=σL/σT, t and W dependences, and σϕ/σρ. S-1 gives a better description of the light-meson observables, while S-2 provides a better description of the charmonium ratio σψ(2S)/σJ/ψ and the J/ψ decay constant. We also present the charge, magnetic, and quadrupole form factors of the four mesons and compare them with available lattice-QCD results.
Related
- Heavy-quark limit of B-meson distribution amplitudes in light-front holography with longitudinal confinement
- Vector Meson Dominance and Vector Meson Production
- Probing Orbital Angular Momentum Distributions in Elastic Vector Meson Production in Longitudinally Polarized Electron--Proton Scattering
- Imprints of nuclear shell structure in exclusive vector meson production
- Radial Excitation Spectra of Light Pseudoscalar and Vector Mesons in Light-Front Holographic QCD
BibTeX
@misc{puhan2026diffractive,
title = {{Diffractive Vector-Meson Production from the Light-Front Quark Model}},
author = {Satyajit Puhan},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.39647},
eprint = {2609.39647},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.39647},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Diffractive Vector-Meson Production from the Light-Front Quark Model
AU - Satyajit Puhan
PY - 2026
DA - 2026/09/30
PB - arXiv
DO - 10.48550/arxiv.2609.39647
UR - https://arxiv.org/abs/2609.39647
AB - We study exclusive diffractive electroproduction of the ρ^0, ϕ, J/ψ, and ψ(2S) mesons in the color-dipole picture using two spin-orbit light-front wave functions, S-1 and S-2. S-1 follows from the Melosh--Wigner rotation in the light-front quark model (LFQM), while S-2 is the spin-improved form commonly used in holographic and boosted-Gaussian approaches. Both share the same radial wave function, with their parameters determined from the LFQM Hamiltonian. The color-glass-condensate dipole parameters are fixed from inclusive structure-function data, with no fit to diffractive data. We compare the predictions with measurements of cross sections, R=σ_L/σ_T, t and W dependences, and σ_ϕ/σ_ρ. S-1 gives a better description of the light-meson observables, while S-2 provides a better description of the charmonium ratio σ_ψ(2S)/σ_J/ψ and the J/ψ decay constant. We also present the charge, magnetic, and quadrupole form factors of the four mesons and compare them with available lattice-QCD results.
ER -