# infrared divergence

> situation quantum field theories with massless particles, in which Feynman integrals diverge due to low-energy (long-distance) contributions, requiring a cutoff representing detector threshold

**Wikidata**: [Q3032223](https://www.wikidata.org/wiki/Q3032223)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Infrared_divergence)  
**Source**: https://4ort.xyz/entity/infrared-divergence