TL;DR
This paper details the implementation of the $\xi$-process in the DVCS amplitude to maintain gauge invariance in QCD and QED, providing insights into the contour gauge used in various processes.
Contribution
It introduces a detailed application of the $\xi$-process to DVCS amplitude ensuring gauge invariance and clarifies the contour gauge in different contexts.
Findings
Successful demonstration of the $\xi$-process in DVCS amplitude.
Enhanced understanding of the contour gauge in QCD and QED.
Ensured gauge invariance in the DVCS amplitude.
Abstract
In this note, we demonstrate in detail the -process implementation applied to the deeply virtual Compton scattering amplitude to ensure both the QCD and QED gauge invariance. The presented details are also important for understanding of the contour gauge used in different processes.
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