Analysis of the reaction p̄p → K+K−π0 at 900 and at 1642 MeV/c

The antiproton-proton annihilation into KKπ has been studied at incident beam momenta of 900 and 1642 MeV/c with the Crystal Barrel detector at LEAR. A partial wave analysis has been carried out. At lower momenta a J = 1−− state which is probably a superposition of the vectors φ(1680) and ρ(1700) has been observed at a mass of 1700± 8 MeV (Γ = 143± 24 MeV). There is a strong production of f0(1500) at both momenta. f ′ 2(1525) is also clearly distinguished by its interference with f0(1500). Another state at M = 1750±13 MeV (Γ = 148±34 MeV) with spin 0 preferred over spin 1,2 and 3 has been observed at higher momentum. This resonance is most likely the f0(1710).