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one question in this growing amplitude business that i don't understand. Usually one says that conformal field theories do not have any non-trivial scattering amplitudes because one cannot define asymptotic states. But say we consider now N=4 Super Yang Mills and moreover treelevel. It is a conformal theory but it has non-vanishing amplitudes, like the infamous MHV amplitude. How can that be that an conformal field theory has non-vanishing amplitudes?

Cheers,

earth2

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# Amplitudes in CFT vanish. Why does N=4 have them?

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