Calculating the Q(Q)over-bar potential in (2+1)-dimensional light-front QCD

Pure glue QCD is formulated on a (2 + 1)-dimensional transverse lattice, using discrete light-front quantization. The transverse component of the gauge fields is taken to be compact, but in a linearized approximation with an effective potential. The (rest-frame) <Q(Q)over bar> potential is evaluated numerically using Lanzcos matrix diagonalization. We first discuss the strong coupling limit analytically and then present numerical results beyond the strong coupling limit. The physical origin of confinement on a transverse lattice depends on the orientation of the external char es: For longitudinally separated charges, confinement arises from the instantaneous Coulomb interaction and for transversely separated quarks a string of link-fields forms. In the general case one obtains a superposition of both effects. Despite the asymmetry in the microscopic mechanism, already a very simple ansatz for the effective link-field potential provides an almost rotationally invariant <Q(Q)over bar> potential. The momentum carried by the glue depends strongly on the orientation of the external charges, which might have observable consequences.