The Crystal Barrel Collaboration

The three reactions pp! … 0 … 0 … 0 , … 0 … 0 · and … 0 ·· in proton-antiproton annihilation in ∞ight at 900 MeV=c are used to search for isoscalar 0 ++ and 2 ++ mesons in the mass range 1000i 2000 MeV, in particular the f0(1710). The description of both … 0 … 0 … 0 and … 0 ·· data sets requires an isoscalar tensor resonance decaying into … 0 … 0 and ·· with a mass of (1867§ 46) MeV and a width of (385§ 58) MeV. The ratio of partial widths i (··)=i (…… )i s 0:27§ 0:10. The analyses of both … 0 … 0 … 0 and … 0 ·· show no signal for the f0(1710). The … 0 ·· data set shows a strong signal of the f 0 2(1525) suggesting a large OZI rule violation for tensor meson production in pp annihilation. The … 0 … 0 … 0 data set also requires the f2(1565). The signal for the f2(1810) reported by earlier experiments is conflrmed neither in … 0 … 0 … 0 nor in … 0 ··. The analysis of … 0 … 0 · leads to an isovector tensor state decaying into … 0 · with a mass of (1698§ 44) MeV and a width of (265§ 55) MeV.