Field-dependent BRST transformations in Yang-Mills theory

Understand

We find an explicit form for the Jacobian of arbitrary field-dependent BRST transformations in Yang-Mills theory.

• For the functional-integral representation of the (gauge-fixed) Yang-Mills vacuum functional, such transformations merely amount to a precise change in the gauge-fixing functional.
• This proves the independence of the vacuum functional under any field-dependent BRST transformation.
• We also give a formula for the transformation parameter functional which generates a prescribed change of gauge and evaluate it for connecting two arbitrary R_xi gauges.