# penguin diagram

> one-loop Feynman diagram in which a quark temporarily changes flavor (via a W or Z loop) and the flavor-changed quark engages in some tree interaction

**Wikidata**: [Q1529808](https://www.wikidata.org/wiki/Q1529808)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Penguin_diagram)  
**Source**: https://4ort.xyz/entity/penguin-diagram