Abstract
The couplings of scalar gluonium as well as quark-antiquark scalar nonet states to the pseudoscalar mesons are discussed on the basis of the low-energy theorems of broken chiral symmetry and scale invariance implemented using phenomenological Lagrangians. Mixing between pure gluonium σ and theSU(3)F singlet quarkoniumS0 is considered. Taking for the masses ofS0 and σ the values based on estimates of the quark model and of recent QCD lattice calculations, respectively, and using the “standard” values of the gluon condensate then the mixture ofS0 and σ in the physical statesG and ɛ is predicted to be approximately half- and- half. We predictG to have properties consistent with the GAMSf0(1590) meson, while ɛ is predicted to be the wide effective gluonium state below 1 GeV. On this basis we suggest a possible consistent description of the whole scalar xxxxx nonet. The picture containsS*(975) neither as xxxxxxx nor asgg state and we support thus still more exotic interpretation of theS*(975) effect.
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