4-momentum problem

  • Thread starter coregis
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  • #1
coregis
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I'm having trouble understanding conservation of 4-momentum. My problem is about dertermining the threshold for triplet production from a photon and an electron using 4-momentum conservation. The answer is 4m0c^2. So far, I say the initial energy is:

E1^2=(pc)^2 + (m0c^2)^2=(hv)^2+(m0c^2)^2

At threshold energy after collision, three particles with no momentum are produced, so

E2^2=(3m0c^2)

E1=E2, but substituting and solving for hv does not work out correctly, and I have not used 4-momentum at all anyhow. What am I doing wrong/forgetting? Help!
 

Answers and Replies

  • #2
David
Science Advisor
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It might help to know what the question actually asks.
 
  • #3
coregis
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David said:
It might help to know what the question actually asks.
verbatim- "Show the threshold for triplet production is 4m0c^2 using the concept of conservation of 4-momentum." Sorry for the paraphrase.
 
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