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The lightest scalar glueball
Recently performed investigations of meson spectra allow us to determine the
resonance structure for the waves , , ,
= in the mass region up to 1900 MeV, thus
establishing the meson multiplets and .
Experimental data demonstrate that there are five scalar/isoscalar states in
this mass region. Four of them are states, that is, members of the
and nonets, while the fifth state is an extra
one not accomodated by systematics; it has the properties of the
lightest scalar glueball. Analysis of the -wave performed within the
framework of the dispersion relation technique allows us to reconstruct the
mixing of a pure gluonium with neighbouring scalar states belonging
to and nonets: three scalar mesons share the
gluonium state between each other -- those are two comparatively narrow
resonances and and a broad resonance
. The broad state is a descendant of the gluonium,
keeping about 40-50% of its component.Comment: 48 pages, LaTeX, 25 PostScript figures, epsfig.sty. Submitted to
Russian Journal Uspekhi Fiz. Nauk (Phys-Uspekhi