Okay so i have a question for you guys(adsbygoogle = window.adsbygoogle || []).push({});

if I have a positron striking an electron at rest to create 2 pions( + and -) and I want to calculate the minimum kinnetic energy that the electrons can possess to create these pions... then the created pions will be at rest correct?

so this gives me two four vectors

[E_{e+}+E_{e-},P_{e+}C,0,0)

the other one being

[E_{pi+}+E_{pi-},0,0,0]

now what really confuses me is.

1) momentum isn't conserved? we're still in the same frame of refernce ie lab frame, shouldn't momentum be conserved?

2) is energy conserved? if so when i equate the energies and equate the four vector length (invariant mass) i get different answers?

Thanks for your help!

Adam

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# 4 momentum is particle physics

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