penguin diagram
English
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Etymology
[edit]Coined 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
[edit]penguin diagram (plural penguin diagrams)
- (physics) A type of unicyclic Feynman diagram in which a quark temporarily changes flavor and engages in an interaction.