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Ground and first radially excited scalar isoscalar meson states and a scalarglueball are described in a nonlocal U(3)xU(3) quark model. The glueball isintroduced into the effective meson Lagrangian by means of the dilaton model onthe base of the scale invariance of the meson Lagrangian. The scale invariancebreaking by current quark masses and gluon anomalies is taken into account. Theglueball anomalies turn out to be important for the description of theglueball-quarkonia mixing. The masses of five scalar isoscalar meson states andtheir strong decay widths are calculated. The state f_0(1500) is shown to becomposed mostly of the scalar glueball.Comment: Latex, 2 figures, uses package graphic

Ground and excited scalar isoscalar meson states in a U(3)×U(3) quark model with a glueball