Generalized Ward identity and gauge invariance of the color-superconducting gap
arXiv:hep-ph/0401152 · doi:10.1103/PhysRevD.69.071501
Abstract
We derive a generalized Ward identity for color-superconducting quark matter via the functional integral approach. The identity implies the gauge independence of the color-superconducting gap parameter on the quasi-particle mass shell to subleading order in covariant gauge.
5 pages, 1 Postscript figure, uses Revtex
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