A-Level Physics - Year 1 (AS): Where are hadrons and leptons positioned in a Feynman diagram, and can they meet at a vertex?

Question

Where are hadrons and leptons positioned in a Feynman diagram, and can they meet at a vertex?

daavide · Accepted Answer

Hadrons/quarks are on the left, and leptons are on the right, and they must not meet at a vertex.

Where are hadrons and leptons positioned in a Feynman diagram, and can they meet at a vertex?