penguin diagram
English
editEtymology
editCoined by John Ellis in 1977, based on the shape of the diagram and inspired by a bet made with Melissa Franklin to put the word "penguin" in his next paper.
Noun
editpenguin diagram (plural penguin diagrams)
- (physics) A type of unicyclic Feynman diagram in which a quark temporarily changes flavor and engages in an interaction.