Generalized Ward identity and gauge invariance of the color-superconducting gap
De-fu Hou, Qun Wang, Dirk H. Rischke
DOI 10.1103/PhysRevD.69.071501 · Physical Review D
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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 quasiparticle mass shell to subleading order in the covariant gauge.
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