The lightest scalar glueball

V.V. Anisovich
B.P. Konstantinov St. Petersburg Institute of Nuclear Physics, Russian Academy of Sciences, Gatchina, Leningrad Region, Rusian Federation

Recent studies of meson spectra have enabled the resonance structure of the IJ^PC = 00⁺⁺, 10⁺⁺, 02⁺⁺, 12⁺⁺, and IJ^P = 1/2 0⁺ waves to be found for masses ranging up to 1900 MeV, thus fully reconstructing the 1³ P₀q \-{q} and 2³P₀q \-{q} meson multiplets. There is firm experimental evidence for the existence of five scalar-isoscalar states in this mass range, four of which are q \-{q} states and members of the 1³ P₀q \-{q} and 2³ P₀q \-{q} nonets, whereas the fifth falls out of the quark picture and displays all the properties of the lightest possible scalar glueball. A dispersion analysis of the 00⁺⁺ wave elucidates how the mixture of the pure glueball state (or gluonium) with neighboring scalar q \-{q} states forms: three scalar mesons, namely two relatively narrow f₀(1300) and f₀(1500) resonances and a very broad f₀(1530_-250⁺⁹⁰) resonance, share the gluonium, the broad resonance being the gluonium’s descendant and accounting for about 40 to 50% of it.

PACS: 12.39.Mk, 12.38.−t, 14.40.−n (all)
DOI: 10.1070/PU1998v041n05ABEH000390
URL: https://ufn.ru/en/articles/1998/5/a/
Web of Science

000075061000001
Citation: Anisovich V V "The lightest scalar glueball" Phys. Usp. 41 419–439 (1998)

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Оригинал: Анисович В В «Легчайший скалярный глюбол» УФН 168 481–502 (1998); DOI: 10.3367/UFNr.0168.199805a.0481

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