Hi guys, Standard Model Is this reaction allowed or not? If yes, how do we represent this on Feynman diagram? (electron) + (photon) ------> (muon negative) + (electron) + positron What about this reaction? (muon neutrino) + (electron antinetrino) -----> (muon negative) + (positron) What are the rules for the construction of Feynman diagrams? What conservation rules do I need to know? It would be good if anyone can explain this through Feynman diagrams with a few words. Thanks a lot!