Antiproton--proton annihilation into pion pairs within effective meson theory

TL;DR

This paper develops an effective meson model to describe antiproton-proton annihilation into pion pairs, successfully reproducing experimental data and predicting angular distributions and energy dependence.

Contribution

It introduces a comprehensive effective meson model with Regge factors for antiproton-proton annihilation into pions, covering multiple channels and energy ranges.

Findings

Model accurately fits existing data

Predicts angular distributions for pion pairs

Reproduces energy dependence of annihilation cross sections

Abstract

Antiproton--proton annihilation into light mesons is revisited in the few GeV energy domain, in view of a global description of the existing data. An effective meson model is developed, with mesonic and baryonic degrees od freedom in $s$, $t$, and $u$ channels. Regge factors are added to reproduce the proper energy behavior and the forward and backward peaked behavior. A comparison with existing data and predictions for angular distributions and energy dependence are done for charged and neutral pion pair production.