Well I am sure this is a lame question, but I am stuck over it for hours. I'm working on Bjorken, Drell book, and I'm trying to calculate the extreme relativistic differential cross section for electron-positron scattering.(adsbygoogle = window.adsbygoogle || []).push({});

Well, I have evaluated the cross section up to my attachment's form...

Then it says in order to keep working we choose the center-of-mass frame system, and gives us the inner products of p_{1},p_{1}',-q_{1},-q_{1}'

p_{1}p_{1}'=q_{1}q_{1}'=2E^{2}sin^{2}(θ/2)

p_{1}(-q_{1}')=p_{1}'(-q_{1})=2Ε^{2}

p_{1}(-q_{1})=p_{1}'(-q_{1}')=2Ε^{2}cos^{2}(θ/2)

However that way I can calculate the quantities on the numerator, but I don't know how to work with the denominator...

could someone just tell me how i can find the 4-components of ps and qs?

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# Question on electron-positron scattering

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