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

Masakiyo Kitazawa; Dirk H. Rischke; Igor A. Shovkovy

doi:10.1016/j.physletb.2008.03.067

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arXiv · 0709.2235

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

Masakiyo Kitazawa·Dirk H. Rischke·Igor A. Shovkovy

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Abstract

We explore the formation of diquark molecules and their Bose-Einstein condensation (BEC) in the phase diagram of three-flavor quark matter at nonzero temperature, T, and quark chemical potential, mu. Using a quark model with a four-fermion interaction, we identify possible diquark excitations as poles of the microscopically computed diquark propagator. The quark masses are obtained by solving a dynamical equation for the chiral condensate and are found to determine the stability of the diquark excitations. The stability of diquark excitations is investigated in the T-mu plane for different values of the diquark coupling strength. We find that bound diquark molecules appear at small quark chemical potentials at intermediate coupling and that BEC of non-strange diquark molecules occurs if the attractive interaction between quarks is sufficiently strong.

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Masakiyo Kitazawa, Dirk H. Rischke, Igor A. Shovkovy. 2007-09-14. Bound diquarks and their Bose-Einstein condensation in strongly coupled quark matter. https://doi.org/10.1016/j.physletb.2008.03.067

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