Observation of the phi to pi+pi-pi+pi- Decay

Details Observation of the phi to pi+pi-pi+pi- Decay Observation of the phi to pi+pi-pi+pi- Decay

2000-08-14

arxiv.org/abs/hep-ex/0008019v2

Phys.Lett.B491:81-89,2000

Physics

High Energy Physics

High Energy Physics - Experiment

17 pages, 5 figures

Scientific paper

10.1016/S0370-2693(00)01001-7

Using 11.6 pb^{-1} of data collected in the energy range 0.984--1.06 GeV by CMD-2 at VEPP-2M, the cross section of the reaction e+e- to pi+pi-pi+pi- has been studied. For the first time an interference pattern was observed in the energy dependence of the cross section near the phi meson. The branching ratio of the phi to pi+pi-pi+pi- decay double suppressed by the G-parity and OZI rule is measured Br(phi to pi+pi-pi+pi-) = (3.93 +- 1.74 +- 2.14) \cdot 10^{-6}. The upper limits have been placed for the decays phi to pi+pi-pi+pi-pi0 and phi to eta pi+pi- Br(phi to pi+pi-pi+pi-pi0) < 4.6 \cdot 10^{-6} 90% CL, Br(phi to eta pi+pi-) < 1.8 \cdot 10^{-5} 90% CL.

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