Two flavor color superconductivity in nonlocal chiral quark models

Details Two flavor color superconductivity in nonlocal chiral quark models Two flavor color superconductivity in nonlocal chiral quark models

2004-09-07

arxiv.org/abs/hep-ph/0409072v1

Phys.Rev. D70 (2004) 074026

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages incl. 5 Postscript figures

Scientific paper

10.1103/PhysRevD.70.074026

We study the competence between chiral symmetry restoration and two flavor color superconductivity (2SC) using a relativistic quark model with covariant nonlocal interactions. We consider two different nonlocal regulators: a Gaussian regulator and a Lorentzian regulator. We find that although the phase diagrams are qualitative similar to those obtained using models with local interactions, in our case the superconducting gaps at medium values of the chemical potential are larger. Consequently, we obtain that in that region the critical temperatures for the disappearance of the 2SC phase might be of the order of 100-120 MeV. We also find that for ratios of the quark-quark and quark-antiquark couplings somewhat above the standard value 3/4, the end point and triple point in the $T-\mu$ phase diagram meet and a phase where both the chiral and diquark condensates are non-negligible appears.

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