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Understanding e+e- --> W+W- Process Diagrams
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[QUOTE="davon806, post: 5879968, member: 439351"] I am just following my lecturer's note and he didn't say when we are going to use s or t-channel.I apologize but I'm really confused since this is my first course in particle physics, and I have no previous knowledge in QED so that a lot of course notes online are too difficult for me...:sorry: I'd like to know, if time is flowing from left to right, in both s and t channels? (1st and 2nd pic) To me, the only difference between 1st and 2nd pic is that: 1) e- doesn't physically touch e+ in 2nd pic 2) The exchange particle is different , but I don't know why the force carrier is a neutrino ( It could also be a neutrino in 1st pic) 3) You mentioned the conservation of lepton number, so according to 2nd diagram, we now have ve,e- and W- at the lower vertex. So Le = 1 + 1 = 2 At the upper vertex,Le = 1 - 1 = 0 ? Let say if ve is replaced by a photon, then L is still different at both vertices ( -1 and 1) ? Sorry...Please help:frown: [/QUOTE]
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Understanding e+e- --> W+W- Process Diagrams
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