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Köln 2004 – scientific programme

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HK: Physik der Hadronen und Kerne

HK 46: Theory VII

HK 46.4: Talk

Thursday, March 11, 2004, 17:45–18:00, D

Thermodynamics of two-colour QCD in the Nambu Jona-Lasinio model — •Claudia Ratti1,2 and Wolfram Weise1,21Physik-Department, Technische Universität München, D-85747 Garching, GERMANY — 2ECT*, Villa Tambosi, Strada delle Tabarelle 286, I-38050 Villazzano (Trento) ITALY

We investigate two-flavour and two-colour QCD at finite temperature and chemical potential within the Nambu and Jona-Lasinio model; by minimizing the thermodynamical potential of the system, we find that a second order phase transition occurs at a value of the chemical potential equal to half the mass of the Goldstone modes. For chemical potentials beyond this value the scalar diquarks Bose condense and the diquark condensate is nonzero. We obtain the behaviour of the chiral condensate, the diquark condensate, the baryon charge density, the pion decay constant, and the scalar diquark, pion and sigma masses as a function of the temperature and chemical potential. Very good agreement is found both with lattice results and with the predictions from chiral perturbation theory.

Work supported in part by INFN and BMBF

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