Relative velocity in special relativity and quantum field theory
General Relativity and Quantum Cosmology
2026-04-28 v1 High Energy Physics - Phenomenology
Abstract
A derivation of the relative velocity used in the definition of the relativistic cross-section is given in terms of manifestly Lorentz invariant quantities. Along the way we find that there is a certain arbitrariness in the usual definition of cross-section.
Cite
@article{arxiv.2604.23836,
title = {Relative velocity in special relativity and quantum field theory},
author = {David Garfinkle},
journal= {arXiv preprint arXiv:2604.23836},
year = {2026}
}