The $\phi(1020)\to\pi^0\pi^0\gamma$ decay

TL;DR

This paper reports the measurement of the branching ratio of the decay $ o o o o$ at VEPP-2M, showing dominance of the $f_0(980) o$ intermediate state and determining its parameters.

Contribution

The study provides the first precise measurement of the branching ratio for this decay and characterizes the $f_0(980)$ meson parameters within this process.

Findings

Branching ratio measured as (1.221 ± 0.098 ± 0.061)×10^{-4}.

$f_0(980)$ intermediate state dominates the decay.

$f_0(980)$ meson parameters were obtained.

Abstract

In the SND experiment at VEPP-2M $e^+e^-$ collider the $\phi(1020)\to\pi^0\pi^0\gamma$ decay was studied and its branching ratio was measured: $B(\phi\to\pi^0\pi^0\gamma)=(1.221\pm 0.098\pm0.061)\cdot10^{-4}$. It was shown, that $f_0(980)\gamma$ intermediate state dominates in this decay and the $f_0(980)$-meson parameters were obtained.