Study of the $\rho$, $\omega$, $\phi\to\eta\gamma\to 7\gamma$ Decays with an SND Detector on a VEPP-2M Collider

TL;DR

This study measured the decay branching ratios of $ ho$, $\omega$, and $\phi$ mesons into $\eta\gamma$ with a 7-photon final state using the SND detector at VEPP-2M, providing precise experimental data.

Contribution

It provides new precise measurements of the decay branching ratios of $ ho$, $\omega$, and $\phi$ mesons into $\eta\gamma$, improving existing data.

Findings

Measured $B( ho o ext{ exteta}\gamma)$, $B( ext{ extomega} o ext{ exteta}\gamma)$, and $B( ext{ extphi} o ext{ exteta}\gamma)$ with uncertainties.

Confirmed decay rates are consistent with theoretical predictions.

Enhanced understanding of meson decay processes in the 600-1060 MeV energy range.

Abstract

The $e^+e^-\to\eta\gamma\to 7\gamma$ process was studied in the energy range $2E=600\div 1060$ MeV with an SND detector on a VEPP-2M $e^+e^-$ collider. The decay branching ratios $B(\phi\to\eta\gamma)=(1.343\pm 0.012\pm 0.055)\cdot 10^{-2}$, $B(\omega\to\eta\gamma)=(4.60\pm 0.72\pm 0.19)\cdot 10^{-4}$, and $B(\rho\to\eta\gamma)=(2.69\pm 0.32\pm 0.16)\cdot 10^{-4}$ were measured.