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For example in e-e- -> e-e- scattering (electron-electron scattering) the differential cross section goes to infinity as theta goes to zero. Consequently the cross section is infinite.

But how can we measure and interpret the cross section/differential cross section and interpret it as a probability/event rate if it yields infinite values?

This problem DOESN't exist in e-mu- -> e-mu- scattering. What is the fundamental difference between these two processes?

All computations are done to lowest order.

thx

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# Infinite cross section in scattering

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