The lightest scalar glueball: retrospective view and the current state of the problem
Recently performed investigations of meson spectra allow us to determine the resonance structure for the waves IJ{sup PC}=00{sup ++}, 10{sup ++}, 02{sup ++}, 12{sup ++}=IJ{sup P}=(1/2)0{sup +} in the mass region up to 1900 MeV, thus establishing the meson multiplets 1{sup 3}P{sub 0}qq-bar and 2{sup 3}P{sub 0}qq-bar. Experimental data demonstrate that there are five scalar/isoscalar states in this mass region. Four of them are qq-bar states, that is, members of the 1{sup 3}P{sub 0}qq-bar and 2{sup 3}P{sub 0}qq-bar nonets, while the fifth state is an extra one not accommodated by qq-bar systematics; it has the properties of the lightest scalar glueball. Analysis of the 00{sup ++}-wave performed within the framework of the dispersion relation technique allows us to reconstruct the mixing of a pure gluonium with neighbouring scalar qq-bar states belonging to 1{sup 3}P{sub 0}qq-bar and 2{sup 3}P{sub 0}qq-bar nonets: three scalar mesons share the gluonium state between each other - those are two comparatively narrow resonances f{sub 0}(1300) and f{sub 0}(1500) and a broad resonance f{sub 0}(1530{sub -250}{sup +90}). The broad state is a descendant of the gluonium, keeping about 40-50% of its component.
- OSTI ID:
- 21185768
- Journal Information:
- AIP Conference Proceedings, Vol. 432, Issue 1; Conference: 7. international conference on hadron spectroscopy, Upton, NY (United States), 25-30 Aug 1997; Other Information: DOI: 10.1063/1.55966; (c) 1998 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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