  Strong-interaction physics that lies beyond the standard model may
conveniently be described by an effective Lagrangian. The only genuinely
gluonic CP-conserving term at dimension six is the three-gluon-field-strength
operator $G^3$. This operator, which alters the 3-gluon and 4-gluon vertices
form their standard model forms, turns out to be difficult to detect in final
states containing light jets. Its effects on top quark pair production hold the
greatest promise of visibility.
