Which Feynman diagram or diagrams include feasible processes?

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SUMMARY

This discussion centers on the feasibility of processes represented by Feynman diagrams, specifically questioning the validity of diagrams labeled as c) and d). Participants emphasize the importance of adhering to the rules governing the vertices of Feynman diagrams to determine which processes are allowed. The original poster (OP) expresses frustration over the inability to explain why certain diagrams are deemed incorrect, while others believe that c) and d) are the only potentially feasible options. The thread concludes with a reminder about the importance of providing reasoning based on established knowledge of Feynman diagrams.

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physicscal
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Homework Statement
Which Feynman diagram or diagrams include feasible processes?
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Homework Help
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Hello friends.
I couldn't do it. Which Feynman diagram or diagrams has include feasible process?
 
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Define "feasible". Do you mean "allowed"? If so, think about what rules the vertices of a Feynman diagram need to satisfy.
 
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Yes. Possible process.

I see c) or d). But they are incorrect. Interesting I can't explain it.
 
physicscal said:
Yes. Possible process.

I see c) or d). But they are incorrect. Interesting I can't explain it.
Can you explain why you think these processes are possible/not possible?

-Dan
 
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We have seen lessons, I research again and again my notes. Just the c or d seems possible process on Feynman diagram. I did them unfortunately they're not correct. I still search on Feynman diagrams on internet. Just c and d nearby to be possible.
 
Please take the time to think about and to answer the question posed to you in #4. Your reply is not an answer to that question, but should contain a reasoning based on what you know about Feynman diagrams.
 
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Then, I have to explain all lesson about Feynman diagram )). Thank you.
 
OP tried to delete his original question to close the thread, which is not allowed. Thread is closed now with the OP restored.
 
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