Helicity Soft Dipole Pomeron Model for Vetor Meson Photoproduction by Circularly or Linearly Polarized Photons down to the Production Threshold

TL;DR

This paper introduces a dipole Pomeron model based on Regge theory for vector meson photoproduction with polarized photons, accurately fitting data and improving upon previous models, with applications in cosmic photon polarimetry and strong interaction spin dynamics.

Contribution

The paper develops a novel helicity amplitude model with free parameters for vector meson photoproduction, achieving better data agreement and enabling new polarimetry and spin studies.

Findings

Model accurately describes cross sections and spin-density matrix elements.

Improves agreement with experimental data over previous models.

Provides predictions for circular SDMEs.

Abstract

We present a model with dipole Pomeron bassed on Regge theory framework for vetor meson photoproduction by arbitarily polaried photons. The accurate helicity amplitude is constructed with free trajectory parameters. This model consistently describes the total and momentum-transfer differential cross sections and he spin-density matrix elements in photoproduction of $\rho^{0}$, by fitting it to the data of $3$ categories simultaneously to determine its $20$ parameters. The agreements with experimental data of our model improve those of the previous models remarkably and predictions for circular SDMEs are made. The model provides key description of the process for our innovative polarimetry of cosmic photons and essential insight to explore the non-perturbative regime and the spin dynamics of strong interaction.