  An important first step in the program of hadronization of chiral quark
models is the bosonization in meson and diquark channels. This procedure is
presented at finite temperatures and chemical potentials for the SU(2) flavor
case of the NJL model with special emphasis on the mixing between scalar meson
and scalar diquark modes which occurs in the 2SC color superconducting phase.
The thermodynamic potential is obtained in the gaussian approximation for the
meson and diquark fields and it is given the Beth-Uhlenbeck form. This allows a
detailed discussion of bound state dissociation in hot, dense matter (Mott
effect) in terms of the in-medium scattering phase shift of two-particle
correlations. It is shown for the case without meson-diquark mixing that the
phase shift can be separated into a continuum and a resonance part. In the
latter, the Mott transition manifests itself by a change of the phase shift at
threshold by \pi\ in accordance with Levinson's theorem, when a bound state
transforms to a resonance in the scattering continuum. The consequences for the
contribution of pionic correlations to the pressure are discussed by evaluating
the Beth-Uhlenbeck equation of state in different approximations. A similar
discussion is performed for the scalar diquark channel in the normal phase.
Further developments and applications of the developed approach are outlined.
