Study of the radiative decay $\phi \to \eta \gamma$ with CMD-2 detector

TL;DR

This paper reports on the measurement of the branching ratio for the radiative decay of the phi meson into eta and gamma using data from the CMD-2 detector, providing precise experimental results.

Contribution

First measurement of the branching ratio for $ o eta o rip$ decay mode with the CMD-2 detector at VEPP-2M.

Findings

Branching ratio B($ o eta$) = (1.18 ± 0.03 ± 0.06)%

Data collected corresponds to 1.9 pb^{-1} at VEPP-2M

Analysis confirms the decay mode and measures its probability.

Abstract

Using the $1.9 pb^{-1}$ of data collected with the CMD-2 detector at VEPP-2M the decay mode $\phi \to \eta \gamma$, $\eta \to \pi^+\pi^-\pi^0$ has been studied. The obtained branching ratio is B($\phi \to \eta \gamma) = (1.18 \pm 0.03 \pm 0.06) %$.