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Generalized Ward identity and gauge invariance of the color-superconducting gap

Defu Hou·Qun Wang·Dirk H. Rischke
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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 quasi-particle mass shell to subleading order in covariant gauge.

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Defu Hou, Qun Wang, Dirk H. Rischke. 2004-01-21. Generalized Ward identity and gauge invariance of the color-superconducting gap. https://doi.org/10.1103/physrevd.69.071501

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