GLUELUMP SPECTRUM AND ADJOINT SOURCE POTENTIAL IN LATTICE QCD(3)

We calculate the potential between ''quarks'' which are in the adjoint representation of SU(2) color in the three-dimensional lattice theory . We work in the scaling region of the theory and at large quark separ ations R. We also calculate the masses M-Qg of color-singlet bound sta tes formed by coupling an adjoint quark to adjoint glue (''gluelumps'' ). Good scaling behavior is found for the masses of both magnetic (ang ular momentum J = 0) and electric (J = 1) gluelumps, and the magnetic gluelump is found to be the lowest-lying state. It is naively expected that the potential for adjoint quarks should saturate above a separat ion R-scr where it becomes energetically favorable to produce a pair o f gluelumps. We obtain a good estimate of the naive screening distance R-scr. However we find little evidence of saturation in the potential out to separations R of about 1.5R(scr). (C) 1997 Published by Elsevi er Science B.V.