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seratend said:(what zapper said: we can measure the momentum pz with the precision we want depending only on the technology feasibility).
Seratend.
Actually, I said py, since in my example, the particles are moving in the z-direction when it hits the slit that is oriented along the x-direction. So the slit has a width Delta(y).
But, those are just details... :)
Zz.