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A type of unicyclic Feynman diagram in which a quark temporarily changes flavor and engages in an interaction.
Definition source: English Wiktionary via Wiktextract
Topics: natural-sciences, physical-sciences, physics
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Meaning relationships
Synonyms: none provided
Antonyms: none provided
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.