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Interaction of Particles 
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#1
Apr2914, 01:45 AM

P: 22

When we describe the amplitude of two interacting particles, we are integrating w.r.t the relative momentum of the particles. Why we do this?
Thank you all of you. 


#2
Apr2914, 02:24 AM

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P: 12,369

Because that is how you work it out.
Did you have another way in mind? 


#3
Apr2914, 03:14 AM

P: 736

Because you integrate over the propagator momentum transfer... the propagator will propagate the momentum from one particle to the other, but its momentum transfer q can take any value....
So you integrate over it to take all possible momenta?? Maybe I;m wrong, without seeing the actual formula... 


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