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A quark-meson-diquark plasma is considered within the PNJL model fordynamical chiral symmetry breaking and restoration in quark matter. Based on ageneralized Beth-Uhlenbeck approach to mesons and diquarks we present thethermodynamics of this system including the Mott dissociation of mesons anddiquarks at finite temperature. A striking result is the suppression of thediquark abundance below the chiral restoration temperature by the coupling tothe Polyakov loop, because of their color degree of freedom. This is understoodin close analogy to the suppression of quark distributions by the samemechanism. Mesons as color singlets are unaffected by the Polyakov-loopsuppression. At temperatures above the chiral restoration mesons and diquarksare both suppressed due to the Mott effect, whereby the positive resonancecontribution to the pressure is largely compensated by the negative scatteringcontribution in accordance with the Levinson theorem.

Polyakov-loop suppression of colored states in a quark-meson-diquark plasma