  The masses of two-gluon glueballs are studied with a semirelativistic
potential model whose interaction is a scalar linear confinement supplemented
by a one-gluon exchange mechanism. The gluon is massless but the leading
corrections of the dominant part of the Hamiltonian are expressed in terms of a
state dependent constituent gluon mass. The Hamiltonian depends only on 3
parameters: the strong coupling constant, the string tension, and a gluon size
which removes all singularities in the leading corrections of the potential.
Accurate numerical calculations are performed with a Lagrange mesh method. The
masses predicted are in rather good agreement with lattice results and with
some experimental glueball candidates.
