https://doi.org/10.1007/s100520100860
Proton-Antiproton annihilation at 900 MeV/c into π0π0π0, π0π0η and π0ηη
1
Universität Zürich, 8057 Zürich, Switzerland
Received:
18
June
2001
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
