Comments on ISR method in modern experiment and influence of final state radiation

TL;DR

This paper investigates the impact of final state radiation in electron-positron annihilation into proton-antiproton pairs, highlighting its significance in specific kinematic regions relevant to BaBar and BESIII experiments.

Contribution

It provides a detailed analysis of how final state radiation affects measurements in $e^+e^- o ar p p$ processes, emphasizing the need to include this effect in experimental data interpretation.

Findings

Final state radiation can be significant at low photon energy fractions.

The effect influences the accuracy of cross-section measurements.

It is essential to account for this radiation in experimental analyses.

Abstract

We study the effect of final state radiation in the process $e^++e^- \to \bar p+ p$, in the kinematical conditions of BaBar and BESIII experiment. We show that this effect could be large, in particular in the low $x$ region ($x$ is the photon energy fraction) and should be taken into account.