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

R. L. S. Farias·G. Dallabona·G. Krein·O. A. Battistel
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Abstract

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 μof the order of the cutoff Λ, predicting in particular a vanishing gap at μ\sim Λ. 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.

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R. L. S. Farias, G. Dallabona, G. Krein, O. A. Battistel. 2006-04-11. Cutoff-independent regularization of four-fermion interactions for color superconductivity. https://doi.org/10.1103/physrevc.73.018201

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