Cutoff-independent regularization of four-fermion interactions for color superconductivity

We implement a cutoff-independent regularization of four-fermion interactions to calculate the color-superconducting gap parameter in quark matter. The traditional cutoff regularization has difficulties for chemical potentials {mu} of the order of the cutoff {lambda}, predicting in particular a vani...

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Bibliographic Details
Published in:Physical review. C, Nuclear physics Nuclear physics, 2006-01, Vol.73 (1), Article 018201
Main Authors: Farias, R. L. S., Dallabona, G., Krein, G., Battistel, O. A.
Format: Article
Language:English
Subjects:
COLOR MODEL
COUPLING
DENSITY
FERMI INTERACTIONS
NUCLEAR PHYSICS AND RADIATION PHYSICS
POTENTIALS
QUANTUM CHROMODYNAMICS
QUARK MATTER
SUPERCONDUCTIVITY
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Summary:We implement a cutoff-independent regularization of four-fermion interactions to calculate the color-superconducting gap parameter in quark matter. The traditional cutoff regularization has difficulties for chemical potentials {mu} of the order of the cutoff {lambda}, predicting in particular a vanishing gap at {mu}{approx}{lambda}. The proposed cutoff-independent regularization predicts a finite gap at high densities and indicates a smooth matching with the weak coupling QCD prediction for the gap at asymptotically high densities.
ISSN:0556-2813
1089-490X
DOI:10.1103/PhysRevC.73.018201