arXiv:hep-ph/0401152·v1·High Energy Physics — Phenomenology
Generalized Ward identity and gauge invariance of the color-superconducting gap
Defu Hou (Frankfurt U. & Huazhong Normal U.)🇩🇪 · Qun Wang (Frankfurt U. & Shangdong U.)🇩🇪 · Dirk H. Rischke (Frankfurt U.)🇩🇪
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.
Comments: 5 pages, 1 Postscript figure, uses Revtex