Cross section of the reaction $e^+ e^- \to π^+π^-π^+π^- $ below 1 GeV at CMD-2

Details Cross section of the reaction $e^+ e^- \to π^+π^-π^+π^- $ below 1 GeV at CMD-2 Cross section of the reaction $e^+ e^- \to π^+π^-π^+π^- $ below 1 GeV at CMD-2

1999-12-10

arxiv.org/abs/hep-ex/9912020v1

Phys.Lett.B475:190-197,2000

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 5 figures

Scientific paper

10.1016/S0370-2693(00)00043-5

Using 3.07 ${pb}^{-1}$ of data collected in the energy range 0.60-0.97 GeV by CMD-2, about 150 events of the process $\epm \to \pch$ have been selected. The energy dependence of the cross section agrees with the assumption of the $a_1(1260) \pi$ intermediate state which is dominant above 1 GeV. For the first time \fourpi events are observed at the $\rho$ meson energy. Under the assumption that all these events come from the $\rho$ meson decay, the value of the cross section at the $\rho$ meson peak corresponds to the following decay width: \Gamma(\rho^0 \to \fourpi) = (2.8 \pm 1.4 \pm 0.5) {keV} or to the branching ratio B(\rho^0 \to \fourpi) = (1.8 \pm 0.9 \pm 0.3) \cdot 10 ^{-5}.

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