Deep exclusive charged $\pi$ electroproduction above the resonance region

TL;DR

This paper presents a combined Regge pole and resonance model for high-energy exclusive charged pion electroproduction off nucleons, successfully describing experimental cross sections and scaling behaviors observed at JLAB and DESY.

Contribution

It introduces a novel hybrid model integrating Regge trajectories with nucleon resonance effects, providing accurate descriptions of experimental data in the resonance and deep inelastic regions.

Findings

Model accurately describes measured cross sections at JLAB and DESY.

Scaling behavior of cross sections aligns with experimental data.

Predictions for polarized asymmetries at JLAB 12 GeV are provided.

Abstract

A description of exclusive charged pion electroproduction $(e,e'\pi^{\pm})$ off nucleons at high energies is proposed. The model combines a Regge pole approach with residual effect of nucleon resonances. The exchanges of $\pi$(140), vector $\rho(770)$ and axial-vector $a_1(1260)$ and $b_1(1235)$ Regge trajectories are considered. The contribution of nucleon resonances is described using a dual connection between the exclusive hadronic form factors and inclusive deep inelastic structure functions. The model describes the measured longitudinal, transverse and interference cross sections at JLAB and DESY. The scaling behavior of the cross sections is in agreement with JLAB and deeply virtual HERMES data. The results for a polarized beam-spin azimuthal asymmetry in $(\vec{e},e'\pi^{\pm})$ are presented. Model predictions for JLAB at 12 GeV are given.