The discussion focuses on the S-Channel process represented by the reaction a+b->c+d, specifically addressing the two time-ordered diagrams associated with this process. One diagram represents the annihilation of particles a and b into a photon, which then produces particles c and d. The second time-ordered diagram emphasizes the importance of vertex ordering, where the annihilation vertex precedes the photon emission vertex, distinguishing it from standard Feynman diagrams that combine both into a single representation.
PREREQUISITESParticle physicists, students of quantum field theory, and anyone interested in understanding the nuances of S-Channel processes and time-ordered diagrams.
If you are working with time-ordered diagrams, things are different than with usual Feynman diagrams.Silviu said:Hello I encountered a problem in which it is specify that there are 2 time-ordered diagram for the s-channel for a certain process a+b->c+d. I understand that there is the one that can be associated with annihilation, but what would be a second one?
Thank you!