The gauge-fixing parameter ξ dependence of two-point gauge variant correlation functions is studied for QED and QCD. We show that, in three Euclidean dimensions, or for four-dimensional thermal gauge theories, the usual procedure of getting a general covariant gauge-fixing term by averaging over a class of covariant gauge-fixing conditions leads to a nontrivial gauge-fixing parameter dependence...

We present a methodology and a prototype of a source-to-source transformation tool for error fixing in C/C++ program source code for missing condition checks after a method call. The missing condition checks in a C program could lead to a program crash. This tool can be extended for other programming languages in addition to C/C++. The developed tool includes the ability to generate and apply a...

We discuss how the renormalisation scheme ambiguities in QCD can be fixed, when two observables are related, by requiring the coefficients in the perturbative expansion relating the two observables to have their conformal limit values, i.e. to be independent of the β-function of the renormalised coupling. We show how the next-to-leading order BLM automatic scale fixing method can be extended to...