Unregulated divergences of Feynman integrals

• Published in: Physics letters. B Vol. 862; p. 139299
• Main Author: Chen, Wen
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2025; Elsevier

Feynman integrals can be expanded asymptotically with respect to some small parameters at the integrand level, a technique known as the expansion by regions. A naive expansion by regions may break down due to divergences not regulated by the spacetime dimension, exemplified by the rapidity divergenc...