Gluonium and the 0++ spectrum

We suggest that the sigma (broad ππ s-wave states below 1 GeV) and the Ssup(*)(0.98) can be interpreted by a mixing between a scalar gluonium and an SU(2) singlet meson with a mixing angle of the order of 140-190. The decays of the sigma and of the Ssup(*) into a pseudoscalar pair are shown to be dominated by their gluon component. In this way, one expects a universal coupling of the sigma and of the Ssup(*) to ππ and Kanti K. The above scheme is confronted to the psi-decays and to some scattering data. A radial excitation assignment of the G(1.6) is discussed. (orig.)