In quantum field theory, penguin diagrams are a class of Feynman diagrams which are important for understanding CP violating processes in the Standard Model. They refer to one-loop processes in which a quark temporarily changes flavor (via a W or Z loop), and the flavor-changed quark engages in some tree interaction, typically a strong one.
In quantum field theory, penguin diagrams are a class of Feynman diagrams which are important for understanding CP violating processes in the Standard Model. They refer to one-loop processes in which a quark temporarily changes flavor (via a W or Z loop), and the flavor-changed quark engages in some tree interaction, typically a strong one.
Source: Wikipedia "Penguin diagram" · CC BY-SA 4.0
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