Abstract
A combined fit is presented to data on p ̄ p annihilation in flight to final states ηπ 0 π 0, π 0 π 0, ηη, ηη′ and π − π +. The emphasis lies in improving an earlier study of ηπ 0 π 0 by fitting data at nine p̄ momenta simultaneously and with parameters consistent with the two-body channels. There is evidence for all of the I=0, C=+1 q ̄ q states expected in this mass range. New resonances are reported with masses and widths ( M, Γ) as follows: J PC =4 −+ (2328±38, Γ=240±90) MeV, 1 ++ (1971±15, 240±45) MeV, 0 −+ (2285±20, 325±30) MeV, and 0 −+ (2010 +35 −60, 270±60) MeV. Errors on the masses and widths of other resonances are also reduced substantially. All states lie close to parallel straight line trajectories of excitation number vs. mass squared.
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