COMPLETE WETTING IN SUPERSYMMETRIC QCD - OR WHY QCD STRINGS CAN END ON DOMAIN-WALLS

As argued by Witten on the basis of M theory, QCD strings can end on d omain walls. We present an explanation of this effect in the framework of effective field theories for the Polyakov loop and the gluino cond ensate in N = 1 supersymmetric QCD. The domain walls separating confin ed phases with different values of the gluino condensate are completel y wet by a layer of deconfined phase at the high-temperature phase tra nsition. As a consequence, even at low temperatures, the Polyakov loop has a nonvanishing expectation value on the domain wall. Thus, close to the wall, the free energy of a static quark is finite and the strin g emanating from it can end on the wall. [S0031-9007(98)07172-5].