Updated measurement of the $e^+e^- \to \omega \pi^0 \to \pi^0\pi^0\gamma$ cross section with the SND detector

TL;DR

This paper presents an updated measurement of the $e^+e^- o \omega \pi^0$ cross section in the 1.05--2.00 GeV range using the SND detector, correcting previous radiative correction errors and testing the conserved vector current hypothesis.

Contribution

The study provides a corrected and more precise measurement of the cross section, incorporating a refined radiative correction and applying a vector meson dominance model with three $ ho$-like states.

Findings

Updated cross section measurement with corrected radiative corrections

Test of the conserved vector current hypothesis in tau decay

Fit of data with a three-$ ho$-like state vector meson dominance model

Abstract

We analyze a 37 pb$^{-1}$ data sample collected with the SND detector at the VEPP-2000 $e^+e^-$ collider in the center-of-mass energy range 1.05--2.00 GeV and present an updated measurement of the $e^+e^- \to \omega \pi^0 \to \pi^0\pi^0\gamma$ cross section. In particular, we correct the mistake in radiative correction calculation made in our previous measurement based on a part of the data. The measured cross section is fitted with the vector meson dominance model with three $\rho$-like states and used to test the conserved vector current hypothesis in the $\tau^-\to\omega\pi^-\nu_{\tau}$ decay.