Systematics of quark-antiquark states and scalar exotic mesons

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  • 13 August 2002
Abstract
The analysis of the experimental data of Crystal Barrel Collaboration on the p p-bar annihilation in flight with the production of mesons in the final state resulted in a discovery of a large number of mesons over the region 1900-2400 MeV, thus allowing us to systematize quark-antiquark states in the (n,M^2) and (J,M^2) planes, where n and J are radial quantum number and spin of the meson with the mass M. The data point to meson trajectories in these planes being approximately linear, with a universal slope. The sector of scalar mesons is discussed in more detail, where, on the basis of the recent K-matrix analysis, the nonet classification of quark-antiquark states is performed: in the region below 2000 MeV, two scalar nonets are fixed, that is, the basic 1^3P_0 q q-bar nonet and that of the first radial excitation, 2^3P_0 q q-bar. In the scalar sector, there are two states with the isospin I=0, which are extra ones with respect to the q q-bar classification, i.e. exotic states: the broad resonance f_0(1200-1600) and the light sigma-meson. The ratios of coupling constants for the transitions f_0 -> pi pi, K K-bar, eta eta, eta eta' point to the gluonium nature of the broad state f_0(1200-1600) and enable us to estimate the ratios of the gluonium and quarkonium components in the f_0(980), f_0(1300), f_0(1500), and f_0(1750). The performed classification of scalar meson states is in a reasonable agreement with the estimate of quarkonium components obtained from the analysis of experimental data on the radiative decays.

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