Abstract
The reaction e+e-→ π+π-π0η has been studied in the center-of-mass energy region below 2 GeV in the experiment with the SND detector at the VEPP-2000 e+e- collider. The reaction proceeds via the four intermediate states: ωη, $ \phi \eta $, a0(980)ρ, and a structureless π+π-π0η state, which may be, for example, ρ(1450)π state with ρ(1450) → ρ(770)η. The total e+e-→ π+π-π0η cross section and the cross section for its components, ωη, $ \phi \eta $, and a sum of a0(980)ρ and the structureless state, have been measured separately. Our results are in agreement with previous measurements and have comparable or better accuracies.
Highlights
The main goal of experiments at the VEPP-2000 e+e− collider [1] is the precision measurement of the total cross section of e+e− annihilation into hadrons in the center-of-mass (c.m.) energy (E) region below 2 GeV
The process e+e− → π+π−π0η gives a sizeable contribution to the total cross section above 1.6 GeV. It was established [2] that the e+e− → π+π−π0η reaction proceeds through ωη, φη, a0(980)ρ intermediate states and a structureless π+π−π0η mechanism
The only measurement of the e+e− → π+π−π0η reaction and the cross sections for the subprocesses e+e− → a0ρ and e+e− → nres was performed in the CMD-3 experiment [9] at VEPP-2000
Summary
The main goal of experiments at the VEPP-2000 e+e− collider [1] is the precision measurement of the total cross section of e+e− annihilation into hadrons in the center-of-mass (c.m.) energy (E) region below 2 GeV. The process e+e− → π+π−π0η gives a sizeable contribution to the total cross section above 1.6 GeV. It was established [2] that the e+e− → π+π−π0η reaction proceeds through ωη, φη, a0(980)ρ intermediate states and a structureless π+π−π0η mechanism (nres). The only measurement of the e+e− → π+π−π0η reaction and the cross sections for the subprocesses e+e− → a0ρ and e+e− → nres was performed in the CMD-3 experiment [9] at VEPP-2000. We analyze the π+π−π0η final state with the η meson decayed to γγ and measure separately cross section for its intermediate states
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