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We study numerically the interaction and disorder effects for twoquasiparticles in two and three dimensions. The dependence of theinteraction-induced Breit-Wigner width on the excitation energy above the Fermilevel, the disorder strength and the system size is determined. A regime isfound where the width is practically independent of the excitation energy. Theresults allow to estimate the two quasiparticle mobility edge.Comment: revtex, 4 pages, 4 figure

Two Interacting Quasiparticles Above the Fermi Sea