Study of the Processes e+ e- --> eta gamma, e+ e- --> pi0 gamma --> 3 gamma in the c.m. Energy Range 600--1380 MeV at CMD-2

TL;DR

This study measures branching ratios of specific meson decay processes involving eta and pi0 gamma final states in electron-positron collisions within 600-1380 MeV energy range using the CMD-2 detector, providing precise experimental data.

Contribution

It provides new experimental measurements of branching ratios for rho, omega, and phi meson decays into eta gamma and pi0 gamma channels in the specified energy range.

Findings

Measured branching ratios for rho, omega, phi decays into eta gamma.

Measured branching ratios for rho, omega, phi decays into pi0 gamma.

Data improves understanding of meson decay processes.

Abstract

The processes e+ e- --> eta gamma, e+ e- --> pi0 gamma --> 3 gamma have been studied in the c.m. energy range 600--1380 MeV with the CMD-2 detector. The following branching ratios have been determined: Br(rho --> eta gamma) = (3.21 +- 1.39 +- 0.20)x 10^{-4}; Br(omega --> eta gamma) = (4.44 + 2.29 -1.83 +- 0.28)x 10^{-4}; Br(phi --> eta gamma) = (1.373 +- 0.014 +- 0.085)x 10^{-2}; Br(rho --> pi0 gamma) = (6.21 +1.28 - 1.18 +- 0.39)x 10^{-4}; Br(omega --> pi0 gamma) = (9.06 +- 0.20 +- 0.57)x 10^{-2}; Br(phi --> pi0 gamma) = (1.258 +- 0.037 +- 0.077)x 10^{-3};