Published in
Elsevier, Physics Letters B, 3(291), p. 347-354, 1992
DOI: 10.1016/0370-2693(92)91057-g
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Proton-antiproton annihilation into ηηπ-observation of a scalar resonance decaying into ηη
Journal article published in 1992 by
C. Amsler,
I. Augustin,
C. A. Baker,
B. M. Barnett,
C. J. Batty,
R. Beckmann,
K. Beuchert,
P. Birien,
J. Bistirlich,
P. Blüm,
R. Bossingham,
H. Bossy,
K. Braune,
D. V. Bugg,
M. Burchell 
and other authors.
and other authors.
This paper is made freely available by the publisher.
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Abstract
The results of a measurement of p̄p annihilation at rest into ηηπ0 are presented. Assuming a resonance dominated model for the annihilation process an isoscalar JPC=0++ resonance decaying into ηη is observed with a mass of 1560±25 MeV/c2 and a width of 245±50 MeV/c2.