Reanalysis of the $e^+e^-\to\eta\gamma$ reaction cross section

TL;DR

This paper reanalyzes the $e^+e^- o ext{eta} ext{gamma}$ cross section data from the VEPP-2M collider, aiming to improve accuracy by addressing previous ambiguities in the energy dependence modeling using the Vector Dominance Model.

Contribution

It provides a revised analysis of the cross section data with improved modeling of energy dependence, enhancing the precision of previous measurements.

Findings

Refined cross section approximation under new model assumptions

Reduced uncertainties in the energy dependence analysis

Enhanced understanding of the $e^+e^- o ext{eta} ext{gamma}$ process

Abstract

In the experiment with the SND detector at the VEPP-2M $e^+e^-$ collider measuring the $e^+e^-\to \eta\gamma$ cross section in the energy range $0.6<\sqrt{s}<1.38 \mathrm{GeV}$ the reanalysis of data is performed. The goal is to improve the accuracy of the previous results by analysing ambiguities in the approximation of energy dependence of the $e^+e^-\to \eta\gamma$ cross section, which were not taken into account in our previous study. We report new results on the approximation of the $e^+e^-\to \eta\gamma$ cross section based on Vector Dominance Model under new model parameter assumptions.