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I'm studying the $e^{+}e^{-}\rightarrow f^{+} f^{-}$ scattering, where $f$ is a generic fermion ($f^{\pm}\not=e^{\pm}$). I know the process is described by the $s$-channel, but why the $t$-channel or the $u$-channel can't describe it? How can I understand which channel to use to describe the process?

Luca Soriani
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    Have your written down the Feynman diagrams involved in all s,t,u processes? – Cosmas Zachos Feb 10 '20 at 17:43
  • see the answer here https://physics.stackexchange.com/questions/112957/whats-the-difference-between-t-channel-and-s-channel-in-particle-physics – anna v Feb 12 '20 at 05:02
  • Related? https://physics.stackexchange.com/questions/330717/how-to-tell-whether-a-feynman-diagram-is-t-channel-or-s-channel-by-looking – SRS Mar 01 '20 at 06:43

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