Discussion Overview
The discussion centers on Bhabha scattering, specifically the number of leading order Feynman diagrams involved in the process (e+ e- -> e+ e-). Participants explore the implications of different channels (s, t, and u-channel) and their contributions to the scattering event.
Discussion Character
Main Points Raised
- One participant questions why there are only two leading order diagrams in Bhabha scattering, suggesting that there should be contributions from s, t, and u-channel diagrams.
- Another participant asserts that there is only one diagram, clarifying that the s-channel and t-channel contribute to Bhabha scattering, while the u-channel is associated with Moller scattering.
- A different participant expresses confusion, presenting a diagram they believe to be a u-channel diagram for the same reaction.
- One participant clarifies the concept of "crossing" in relation to Feynman diagrams, indicating that it involves a rotation of the diagram rather than a literal crossing of lines.
- A later reply acknowledges a misunderstanding regarding the distinctiveness of the diagram they drew, expressing gratitude for the clarification.
Areas of Agreement / Disagreement
Participants exhibit disagreement regarding the number of leading order diagrams and the role of the u-channel in Bhabha scattering, with no consensus reached on the matter.
Contextual Notes
Some participants may be operating under different assumptions about the definitions and contributions of the various channels in the scattering process, leading to confusion and differing interpretations.
