Implication the observed $\psi(3770)\to p\bar{p}\pi^0$ for studying the $p\bar{p}\to \psi(3770)\pi^0$ process

TL;DR

This study models the $p ar{p} o ext{charmonium} o p ar{p} ext{pion}$ process using effective Lagrangians, fitting parameters to $e^+e^-$ data, and predicts cross sections relevant for future experiments at PANDA.

Contribution

It provides a theoretical prediction of cross sections for $p ar{p} o ext{charmonium} ext{pion}$ processes based on $e^+e^-$ data, including interference effects, aiding future experimental tests.

Findings

Reproduces the line shape of $e^+e^- o par{p} ext{pion}$ data.

Predicts total and differential cross sections for $p ar{p} o ext{charmonium} ext{pion}$.

Highlights the significance of nucleon pole contributions near threshold.

Abstract

We study the charmonium $p \bar{p} \to \psi(3770) \pi^0$ reaction using effective lagrangian approach where the contributions from well established $N^*$ states are considered, and all parameters are fixed in the process of $e^+e^- \to p \bar{p}\pi^0$ at center of mass energy $\sqrt{s} = 3.773$ GeV. The experimental data on the line shape of the mass distribution of the $e^+e^- \to p\bar{p}\pi^0$ can be well reproduced. Based on the studying of $e^+e^- \to p \bar{p}\pi^0$, the total and differential cross sections of the $p \bar{p} \to \psi(3770) \pi^0$ reaction are predicted. At the same time we evaluated also the cross sections of the $p \bar{p} \to \psi(3686) \pi^0$ reaction. It is shown that the contribution of nucleon pole to this reaction is largest close to the reaction threshold. However, the interference between nucleon pole and the other nucleon resonance can still change the angle distributions significantly. Those theoretical results may be test by the future experiments at $\overline{\mbox{P}}$ANDA.