Proton-Antiproton annihilation at 900 MeV/c into π0π0π0, π0π0η and π0ηη
Universität Zürich, 8057 Zürich, Switzerland
Revised: 7 November 2001
Published online: 18 January 2002
The three reactions → π0π0π0, π0π0η and π0ηη in proton-antiproton annihilation in flight at 900 MeV/c are used to search for isoscalar 0++ and 2++ mesons in the mass range 1000--2000 MeV, in particular the f0(1710). The description of both π0π0π0 and π0ηη data sets requires an isoscalar tensor resonance decaying into π0π0 and ηη with a mass of (1867 ± 46) MeV and a width of (385 ± 58) MeV. The ratio of partial widths Γ(ηη)/Γ(ππ) is 0.27 ± 0.10. The analyses of both π0π0π0 and π0ηη show no signal for the f0(1710). The π0ηη data set shows a strong signal of the f'2(1525) suggesting a large OZI rule violation for tensor meson production in annihilation. The π0π0π0 data set also requires the f2(1565). The signal for the f2(1810) reported by earlier experiments is confirmed neither in π0π0π0 nor in π0ηη. The analysis of π0π0η leads to an isovector tensor state decaying into π0η with a mass of (1698 ± 44) MeV and a width of (265 ± 55) MeV.
© Società Italiana di Fisica, Springer-Verlag, 2002