0++-glueball/qq-state mixing in the mass region near 1500 MeV

Based on the results of the K-matrix fit of the (IJPC = 00++) wave [V.V. Anisovich, Yu.D. Prokoshkin and A.V. Sarantsev, Phys. Lett. B 389 (1996) 388; V.V. Anisovich and A.V. Sarantsev, Phys. Lett. B 382 (1996) 429], we analyze the analytic structure of the amplitude and qq/glueball content of resonances in the mass region 1200–1900 MeV, where an extra state for qq-systematics exists being a good candidate for the lightest scalar glueball. Our analysis shows that the pure glueball state is dispersed over three resonances: f0(1300), f0(1500) and f0(1530−250+90), while the glueball admixture in f0(1750) is small. The broad resonance f0(1530−250+90) is the descendant of the lightest pure glueball. The mass of the pure glueball is 1630 ± 3070 MeV, in agreement with Lattice calculation results [F.E. Close and M.J. Teper, On the lightest scalar glueball, preprint RAL-96-040 (1996); G.S. Bali et al., Phys. Lett. B 309 (1993) 378; J. Sexton, A. Vaccarino and D. Weingarten, Phys. Rev. Lett. 75 (1995) 4563].