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The link posted by akhmetelli suggests it's because of parity nonconservation: in the center-of-mass frame for the scattering, at high energy, only left-handed particles and right-handed antiparticles participate in the weak interaction. The two particles may always scatter through an angle of 0ยบ; the technical term for that is "they missed." So the ...


Looks like the answer is quite messy - I cannot reproduce it here - ...

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