BPS AND NON-BPS DOMAIN-WALLS IN SUPERSYMMETRIC QCD WITH SU(3) GAUGE GROUP

We study the spectrum of the domain walls interpolating between differ ent chirally asymmetric vacua in supersymmetric QCD with the SU(3) gau ge group and including 2 pairs of chiral matter multiplets in fundamen tal and anti-fundamental representations. For small enough masses m < m approximate to .286 Lambda(SQCD), there are two different domain wa ll solutions which are BPS-saturated and two types of ''wallsome sphal erons''. At m = m, two BPS branches join together and, in the interva l m < m < m** = 3.704 Lambda(SQCD), BPS equations have no solutions b ut there are solutions to the equations of motion describing a non-BPS domain wall and a sphaleron. For m > m*, there are no solutions what soever. (C) 1998 Published by Elsevier Science B.V. All rights reserve d.