Deep exclusive electroproduction of $\pi^+$ at HERMES

TL;DR

This paper analyzes the deep exclusive electroproduction of $^+$ pions at HERMES using a two-component model, comparing theoretical predictions with experimental data and discussing implications for future JLAB experiments.

Contribution

It introduces a two-component model combining soft and hard mechanisms to describe pion electroproduction, aligning with experimental data and providing insights for future experiments.

Findings

At forward angles, the cross section is longitudinal and dominated by Regge pole exchange.

In the off-forward region, the process is transverse with dominant partonic subprocesses.

Results suggest different mechanisms dominate depending on kinematic region.

Abstract

Deeply virtual electroproduction of pion in exclusive reaction $p(e,e'\pi^+)n$ is studied using a two-component model which includes soft hadronic and hard partonic reaction mechanisms. The results are compared with the experimental data measured at HERMES in the deep inelastic region for values of $Q^2>1$ GeV$^2$ and $W^2 > 10$ GeV$^2$. At forward angles the $\pi^+$ cross section is longitudinal and is dominated by exchange of Regge poles, with $\pi$ the dominant trajectory. The off-forward region with $-t>1$ GeV$^2$ is transverse and shows the dominance of partonic subprocesses. An implication of present results for the future JLAB facilities are briefly discussed.