Scalar Glueball: Analysis of the (IJ PC = 00++)-wave
1997; Springer Nature; Volume: 359; Issue: 2 Linguagem: Inglês
10.1007/s002180050385
ISSN1431-5831
AutoresA. V. Anisovich, V.V. Anisovich, A. Sarantsev,
Tópico(s)High-Energy Particle Collisions Research
ResumoBasing on the previously performed K-matrix analysis of experimental data, we investigate, in the framework of the propagator matrix (D-matrix) technique, the 1100–1900 MeV mass region, where overlapping resonances f 0(1300), f 0(1500), f 0 (1530 ± 250 90 ), and f 0(1780) are located. Necessary elements of the D-matrix technique are developed. The D-matrix analysis confirms previous K-matrix results: in the region 900–1900 MeV five scalar/isoscalar states are located. Four of them are members of the two qq̅-nonets, while one state is an extra for the qq̅ systematics, being a good candidate for the lightest scalar glueball. The D-matrix analysis shows that this extra state, a candidate for the lightest scalar glueball, is dispersed, due to a mixing with qq̅- states, over three resonances: f 0(1300), f 0(1500), and f 0 (1530 ± 250 90 ). The broad resonance f 0 (1530 ± 250 90 ) is a descendant of the lightest glueball carrying about 50% of the gluonium component, the rest of the gluonium is shared between f 0(1300) and f 0(1500). The broad resonance is formed by accumulating a large part of the neighbouring resonance widths that elaborates some type of a trap for the adjoining states.
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