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We explore the formation of diquark molecules and their Bose-Einsteincondensation (BEC) in the phase diagram of three-flavor quark matter at nonzerotemperature, T, and quark chemical potential, mu. Using a quark model with afour-fermion interaction, we identify possible diquark excitations as poles ofthe microscopically computed diquark propagator. The quark masses are obtainedby solving a dynamical equation for the chiral condensate and are found todetermine the stability of the diquark excitations. The stability of diquarkexcitations is investigated in the T-mu plane for different values of thediquark coupling strength. We find that bound diquark molecules appear at smallquark chemical potentials at intermediate coupling and that BEC of non-strangediquark molecules occurs if the attractive interaction between quarks issufficiently strong.

Bound diquarks and their Bose-Einstein condensation in strongly coupled quark matter