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Morgoth
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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.
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 p1,p1',-q1,-q1'
p1p1'=q1q1'=2E2sin2(θ/2)
p1(-q1')=p1'(-q1)=2Ε2
p1(-q1)=p1'(-q1')=2Ε2cos2(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?
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 p1,p1',-q1,-q1'
p1p1'=q1q1'=2E2sin2(θ/2)
p1(-q1')=p1'(-q1)=2Ε2
p1(-q1)=p1'(-q1')=2Ε2cos2(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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