Exercise:
Consider the following Feynman diagrams: abcliste abc center tikzpicture feynman vertex a at e^-; vertex b at ; vertex c at - e^-; vertex d at gamma; diagram* a -- plain b -- plain c b -- blue photon d ; feynman tikzpicture center abc center tikzpicture feynman vertex a at -- e^-; vertex b at - e^+; vertex c at ; vertex d at ; vertex e at - mu^-; vertex f at mu^+; diagram* a -- plain c -- plain b c -- blue photon edge label'gamma d e -- plain d -- plain f ; feynman tikzpicture center abc center tikzpicture feynman vertex a at e^-; vertex b at -. e^-; vertex v at .; vertex v at .; diagram* a -- plain v v -- plain b v -- plain half left looseness. v v -- blue photon half left looseness. v ; node at -. gamma; %node at . e^-; %node at . e^-; feynman tikzpicture center abcliste abcliste abc Ase a horizontal timaxis. Which of the diagrams are possible? Draw the corresponding arrows in the fermionic lines. tabbing hspacecm A hspacecm B hspacecm C tabbing abc Now ase a vertical timaxis. Which of the diagrams are possible? Draw the corresponding arrows in the fermionic lines. tabbing hspacecm A hspacecm B hspacecm C tabbing abc Which diagram corresponds to a pair-creation? Indicate the correct time orientation. tabbing hspacecm A hspacecm B hspacecm C tabbing abc Which diagram corresponds to a self-energy correction? Indicate the correct time orientation. tabbing hspacecm A hspacecm B hspacecm C tabbing abc In diagram c what particle xorresponds to the ermediate fermion? multiple choices are possible tabbing hspace.cm A electron hspace.cm B muon hspace.cm C electron-neutrino hspace.cm D muon-neutrino hspace.cm E quark tabbing abc For which diagrams can the photon be replaced by a Z boson? tabbing hspacecm A hspacecm B hspacecm C tabbing abc For which diagrams can the photon be replaced by a W boson? tabbing hspacecm A hspacecm B hspacecm C tabbing abcliste

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