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Lee, S. (1972). "Higher-Order
Corrections to Leptonic Processes and the Renormalization of Weinberg's Theory of Weak Interactions in the Unitary Gauge".
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components are set to zero. In other words, the unitarity gauge makes the manifest number of scalar degrees of freedom minimal.
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The unitarity gauge is usually used in tree-level calculations. For loop calculations, other gauge choices such as the
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Weinberg, Steven (1971). "Physical
Processes in a Convergent Theory of the Weak and Electromagnetic Interactions".
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Weinberg, Steven (1973). "General Theory of Broken Local
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M.A. L´opez–Osorio, E. Mart´ınez–Pascual, and J.J. Toscano (2004).
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gauge often reduce the mathematical complexity of the calculation.
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Gauge fixing used in theories with spontaneous symmetry breaking
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