Study of the $ππ$ mass spectra in the process $e^+e^- \to π^+π^-π^0$ at $\sqrt[]{s} \simeq 1020$ MeV

Details Study of the $ππ$ mass spectra in the process $e^+e^- \to π^+π^-π^0$ at $\sqrt[]{s} \simeq 1020$ MeV Study of the $ππ$ mass spectra in the process $e^+e^- \to π^+π^-π^0$ at $\sqrt[]{s} \simeq 1020$ MeV

2001-06-12

arxiv.org/abs/hep-ex/0106048v1

Phys.Rev.D65:032002,2002

Physics

High Energy Physics

High Energy Physics - Experiment

22 pages REVTEX and 19 figures

Scientific paper

10.1103/PhysRevD.65.032002

The invariant mass spectra of the $\pi^+\pi^-$ and $\pi^\pm\pi^0$ pairs in the process $e^+e^- \to \pi^+\pi^-\pi^0$ were studied in the SND experiment at the VEPP-2M collider in the energy region $\sqrt[]{s} \simeq 1020$ MeV. These studies were based on about $0.5 \times 10^6$ experimental events. The spectra were analyzed in the framework of the vector meson dominance model. It was found that the experimental data can be described with $e^+e^- \to \rho\pi \to \pi^+\pi^-\pi^0$ transition only. Upper limit on the branching ratio of the $\phi(1020)\to\pi^+\pi^-\pi^0$ decay through intermediate states different from $\rho\pi$ was obtained at the 90 % confidence level: $B(\phi\to\pi^+\pi^-\pi^0)<6 \cdot 10^{-4}$. The $\rho$-meson mass and width which follow from the spectra analysis are $m_\rho=775.0\pm 1.3$ MeV, $\Gamma_\rho=150.4 \pm 3.0$ MeV. Neutral and charged $\rho$-mesons mass difference was found to equal $m_{\rho^\pm}-m_{\rho^0}=-1.3\pm2.3$ MeV. In the $\pi^+\pi^-$ mass spectrum the $\rho-\omega$ interference was seen at two standard deviations level.

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