A remark on the glueball-gluon coupling

The QCD trace anomaly motivates the consideration of a low energy glueball- gluon coupling phi G(mu upsilon)(alpha)G(alpha)(mu upsilon). We point out t hat this should constitute the leading kinetic term for the gluons at low e nergies. Anti-screening of the gluons by the glueball then induces a classi cal Coulomb potential of color charges which increases at large distances s imilar to r(1/3) and motivates the inclusion of a corresponding term in the inter-quark potential.