Study of the Process e+ e- --> pi0 pi0 gamma in c.m. Energy Range 600--970 MeV at CMD-2

TL;DR

This study measures the cross section of e+ e- --> pi0 pi0 gamma in the 600-970 MeV range, determining branching ratios for rho and omega decays and providing evidence for rho --> f0(600) gamma decay.

Contribution

It presents new measurements of branching ratios for specific meson decays and evidence for the rho --> f0(600) gamma process in the specified energy range.

Findings

Measured B(rho --> pi0 pi0 gamma) = (5.2^{+1.5}_{-1.3} +- 0.6) x 10^{-5}

Evidence for rho --> f0(600) gamma decay with B = (6.0^{+3.3}_{-2.7} +- 0.9) x 10^{-5}

Set upper limit on B(omega --> eta pi0 gamma) < 3.3 x 10^{-5} at 90% CL

Abstract

The cross section of the process e+ e- --> pi0 pi0 gamma has been measured in the c.m. energy range 600--970 MeV with the CMD-2 detector. The following branching ratios have been determined: B(rho --> pi0 pi0 gamma) =(5.2^{+1.5}_{-1.3} +- 0.6)x10^{-5} and B(omega --> pi0 pi0 gamma) =(6.4^{+2.4}_{-2.0} +- 0.8)x10^{-5}. Evidence for the rho --> f0(600) gamma decay has been obtained: B(rho --> f0(600) gamma) = (6.0^{+3.3}_{-2.7}\pm 0.9)x10^{-5}. From a search for the process e+ e- --> eta pi0 gamma the following upper limit has been obtained: B(omega --> eta pi0 gamma) < 3.3 10^{-5} at 90% CL.