UNQUENCHING THE SCALAR GLUEBALL

Computations in the quenched approximation on the lattice predict the lightest glueball to be a scalar in the 1.5-1.8 GeV region. Here we ca lculate the dynamical effect the coupling to two pseudoscalars has on the mass, width, and decay pattern of such a scalar glueball. Modeling this nonperturbative interaction reveals that, If the pure glue state has a width to two pseudoscalars of similar to 100 MeV as predicted o n the lattice, the resulting hadron has a width to these channels of o nly similar to 30 MeV with a large eta eta component. Experimental res ults need to be reanalyzed in light of these predictions to decide if either the f(0)(1500) or an f(0)(1710) coincides with this dressed glu eball.