QED Renormalization Given in A Mass-Dependent Subtraction and The Renormalization Group Approach

TL;DR

This paper presents a mass-dependent subtraction scheme for QED renormalization at a time-like point, ensuring physical consistency and providing explicit one-loop expressions for effective parameters across all distance scales.

Contribution

It introduces a gauge-invariant, mathematically convergent mass-dependent subtraction scheme for QED renormalization, with exact solutions to the renormalization group equations.

Findings

Renormalized results are unambiguous and physically faithful.

Effective coupling and mass are explicitly derived for all distance scales.

The approach maintains gauge symmetry and Lorentz invariance.

Abstract

The QED renormalization is restudied by using a mass-dependent subtraction which is performed at a time-like renormalization point. The subtraction exactly respects necessary physical and mathematical requirements such as the gauge symmetry, the Lorentz- invariance and the mathematical convergence. Therefore, the renormalized results derived in the subtraction scheme are faithful and have no ambiguity. Especially, it is proved that the solution of the renormalization group equation satisfied by a renormalized wave function, propagator or vertex can be fixed by applying the renormalization boundary condition and, thus, an exact S-matrix element can be expressed in the form as written in the tree diagram approximation provided that the coupling constant and the fermion mass are replaced by their effective ones. In the one-loop approximation, the effective coupling constant and the effective fermion mass obtained by solving their renormalization group equations are given in rigorous and explicit expressions which are suitable in the whole range of distance and exhibit physically reasonable asymptotic behaviors.