K-MATRIX ANALYSIS OF THE Kπ S-WAVE IN THE MASS REGION 900− 2100 MEV AND NONET CLASSIFICATION OF SCALAR qq̄-STATES
نویسنده
چکیده
A K-matrix re-analysis of the Kπ S-wave is performed in the mass region 900− 2100 MeV, and solutions which describe the data well are found. The solution with two resonances in the (IJP = 1 20 +)-wave has poles at (1415 ± 25)i(165 ± 25) MeV and (1820 ± 40) -i(125 ± 50) MeV, close to the previous result of D. Aston et al., Nucl.Phys., B296 (1988) 493. The corresponding bare states, which are the subjects of a qq̄ classification, are: Kbare 0 (1220 +50 −60) and K bare 0 (1885 +50 −80). Within the restored bare states, a construction of the 1P0 qq̄ and 2 P0 qq̄ nonets is completed. The three resonance solutions are analysed as well, the corresponding bare states are found, and the qq̄-nonet classification is suggested. In all variants of our qq̄classification, the resonances a0(980) and f0(980) (or their bare counterparts) are non-exotic, and an extra scalar/isoscalar state exists in the mass region 1300-1700 MeV, being a good candidate for the lightest scalar glueball.
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