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We describe baryons as quark-diquark bound states at finite temperature anddensity within the NJL model for chiral symmetry breaking and restoration inquark matter. Based on a generalized Beth-Uhlenbeck approach to mesons anddiquarks we present in a first step the thermodynamics of quark-diquark matterwhich includes the Mott dissociation of diquarks at finite temperature. In asecond step we solve the Bethe-Salpeter equation for the baryon as aquark-diquark bound state in quark-diquark matter. We obtain a stable, boundbaryon even beyond the Mott temperature for diquark dissociation since thephase space occupation effect (Pauli blocking for quarks and Bose enhancementfor diquarks) in the Bethe-Salpeter kernel for the nucleon approximately cancelso that the nucleon mass follows the in-medium behaviour of the quark anddiquark masses towards chiral restoration. In this situation the baryon isobtained as a "borromean" three-quark state in medium because the two-particlestate (diquark) is unbound while the three-particle state (baryon) is bound.

NJL model approach to diquarks and baryons in quark matter