Mesons of the family in processes up to 2 GeV and the chiral-symmetry breakingYu.S. Surovtsev1, D. Krupa2 and M. Nagy2
1 Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, Dubna 141 980, Moscow Region, Russia
2 Institute of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 842 28 Bratislava, Slovakia
(Received: 25 April 2002 / Published online: 26 November 2002)
In a combined analysis of the experimental data on the coupled processes in the channel with IGJPC=0+0++, the various scenarios of these reactions (with different numbers of resonances) are considered. In a model-independent approach, based only on analyticity and unitarity, a resonance is represented by a pole cluster (poles on the Riemann surface) of the definite type that is defined by the state nature. The best scenario contains the resonances f0(665) (with properties of the -meson), f0(980) (with a dominant component), f0(1500) (with a dominant flavour-singlet, e.g., glueball component) and the f0(1710) (with a considerable component). If the f0(1370) exists, it has a dominant component. The coupling constants of the observed states with the considered channels and the and scattering lengths are obtained. The conclusion on the linear realization of chiral symmetry is drawn.
11.55.Bq - Analytic properties of S-matrix.
11.80.Gw - Multichannel scattering.
12.39.Mk - Glueball and nonstandard multi-quark/gluon states.
14.40.Cs - Other mesons with S=C=0, mass < 2.5 GeV.
© Società Italiana di Fisica, Springer-Verlag 2002