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Diffractive electroproduction of light vector particles: Leading Fock-state contribution in the presence of significant higher Fock-state effects

Chao Shi1,*, Liming Lu1, Jian-feng Li2,†, and Wenbao Jia1

  • *Contact author: cshi@nuaa.edu.cn
  • †Contact author: ljf169@ntu.edu.cn
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Phys. Rev. D 112, 074027 – Published 23 October, 2025

DOI: https://doi.org/10.1103/42x8-bztl

Abstract

We study exclusive diffractive production of vector mesons and photons using the color-dipole model with leading Fock-state light-front wave functions derived from Dyson-Schwinger and Bethe-Salpeter equations. New results for the ϕ meson and real photon are presented. Without data fitting, our calculation well matches HERA data in certain kinematical domains. The key finding of this paper is that in a color-dipole model study for ρ/γ and ϕ, where light quarks are involved, the leading qq¯ approximation is valid only when Q2 exceeds 20 and 10  GeV2 respectively, unlike J/ψ which can be well described for Q2≈0  GeV2. This underscores the special role of ϕ electroproduction in the color-dipole picture: it strikes a balance between the large dipole size typical of light mesons and the smaller size associated with high-Q2 photons, making it potentially well suited for probing gluon saturation effects.

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Phys. Rev. D 112, 074027– Published 23 October, 2025
  • Received 6 August 2025
  • Accepted 6 October 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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