Meson resonances in forward-angle $\pi^+\pi^-$ photoproduction

TL;DR

This paper models $^+^-$ photoproduction at forward angles and high energies, predicting mass distributions that align with experimental data, highlighting the dominance of specific resonances in different partial waves.

Contribution

It introduces a model assuming pion exchange dominance to calculate mass distributions, successfully matching experimental observations for low partial waves.

Findings

Model predictions agree well with experimental data.

$S$, $P$, and $D$ waves are dominated by $f_0(980)$, $ ho(770)$, and $f_2(1270)$ resonances.

The approach effectively describes forward-angle $^+^-$ photoproduction at high energies.

Abstract

Assuming that the $\pi^+\pi^-$ photoproduction at forward angles and high energies is dominated by one pion exchange we calculate the $\pi^+\pi^-$ mass distributions for low partial waves. Predictions of the model agree well Assuming that the $\pi^+\pi^-$ photoproduction at forward angles and high energies is dominated by one pion exchange we calculate the $\pi^+\pi^-$ mass distributions for low partial waves. Predictions of the model agree well with the experimental data which indicate that the $S$, $P$ and $D$ waves are dominated by the $f_0(980)$, $\rho(770)$ and $f_2(1270)$, resonances respectively.