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Reviews of topical problems


Systematics of quark-antiquark states and scalar exotic mesons


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

Analysis of experimental data from the Crystal Barrel Collaboration on the in-flight p \-{p} annihilation into mesons revealed a large group of mesons in the 1900-2400-MeV range, allowing the systematization of quark-antiquark states in the (n, M2)- and (J, M2)-planes (n being the radial quantum number, and J the spin of a meson of mass M). From the data, meson trajectories in these planes are approximately linear and have a universal slope. A detailed discussion of the scalar meson sector is given for which, based on a recent K-matrix analysis, the nonet classification of quark-antiquark states places two scalar nonets — the basic nonet and that of the first radial excitation — in the range below 2000 MeV. Two isospin 0 scalar states — the broad resonance f0(1200-1600) and the light σ-meson — do not fit into the quark-antiquark classification, i.e., are exotic. The ratios between the coupling constants for hadronic decays to the ππ, K \-{K} , ηη and ηη’ states point to the gluonium nature of the broad state f0(1200-1600).

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Fulltext is also available at DOI: 10.1070/PU2004v047n01ABEH001333
PACS: 12.38.−t, 12.39.Mk, 14.40.−n (all)
DOI: 10.1070/PU2004v047n01ABEH001333
URL: https://ufn.ru/en/articles/2004/1/d/
000221476600004
Citation: Anisovich V V "Systematics of quark-antiquark states and scalar exotic mesons" Phys. Usp. 47 45–67 (2004)
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Оригинал: Анисович В В «Систематизация кварк-антикварковых состояний и экзотические мезоны» УФН 174 49–72 (2004); DOI: 10.3367/UFNr.0174.200401d.0049

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