Exclusive diffractive production of real photons and vector mesons in a factorized Regge-pole model with non-linear Pomeron trajectory

TL;DR

This paper develops a Regge-pole model with a non-linear Pomeron trajectory to describe exclusive diffractive production of photons and vector mesons in ep collisions, fitting HERA data with few parameters.

Contribution

It introduces an extended factorized Regge-pole model with a non-linear Pomeron trajectory that effectively describes various diffractive processes in ep collisions.

Findings

Model fits HERA data well for total cross sections.

Accurately describes differential cross sections as functions of t.

Uses minimal free parameters for a broad kinematic range.

Abstract

Exclusive diffractive production of real photons and vector mesons in ep collisions has been studied at HERA in a wide kinematic range. Here we present and discuss a Regge-type model of real photon production (Deeply Virtual Compton Scattering), as well as production of vector mesons (VMP) treated on the same footing by using an extension of a factorized Regge-pole model proposed earlier. The model has been fitted to the HERA data. Despite the very small number of the free parameters, the model gives a satisfactory description of the experimental data, both for the total cross section as a function of the photon virtuality Q2 or the energy W in the center of mass of the gamma\star-p system, and the differential cross sections as a function of the squared four-momentum transfer t with fixed Q2 and W.