Measurement of the ${e}^{+}{e}^{-}\to p \bar{p}{\pi}^{0}$ cross section at $\sqrt{s}=2.1000-3.0800$ GeV

TL;DR

This study precisely measures the cross section of the process e+e- to p p-bar pi0 across energies from 2.1 to 3.08 GeV, exploring threshold behavior without observing anomalies.

Contribution

First high-precision measurement of the e+e- to p p-bar pi0 cross section over a broad energy range near threshold.

Findings

No anomalous threshold enhancement observed.

Cross sections measured with high precision.

Data covers energies from 2.1 to 3.08 GeV.

Abstract

The process $e^{+}e^{-}\to p\bar{p}\pi^{0}$ is studied at 20 center-of-mass energies ranging from 2.1000 to 3.0800 GeV using 636.8 pb$^{-1}$ of data collected with the BESIII detector operating at the BEPCII collider. The Born cross sections for $e^{+}e^{-}\to p\bar{p}\pi^{0}$ are measured with high precision. Since the lowest center-of-mass energy, 2.1000 GeV, is less than 90 MeV above the $p\bar{p}\pi^0$ energy threshold, we can probe the threshold behavior for this reaction. However, no anomalous threshold enhancement is found in the cross sections for $e^{+}e^{-}\to p\bar{p}\pi^{0}$.