The reaction e+e-η π+π-
Achasov N. N. , Karnakov V. A.
At energies 4s — 1.0-1.4 GeV we should expect a threshold enhancement of the cross section for the reaction β+β~^>ηπ+π~ because the reaction channel e+e~^ρ^7]ρ^7)π+7T~ comes into play. The width of the decay φ^>ηπ+π~~ has been calculated for the first time: Br(^—>ηπ+π~) = 0.35X 10~6. This width can be extracted from the interference pattern.