One-loop same helicity four-point amplitude from shifts

26 Feb 2020 Chattopadhyay Pratik Krasnov Kirill

It has been suggested a long time ago by W. Bardeen that non-vanishing of the one-loop same helicity YM amplitudes, in particular such an amplitude at four points, should be interpreted as an anomaly. However, the available derivations of these amplitudes are rather far from supporting this interpretation in that they share no similarity whatsoever with the standard triangle diagram chiral anomaly calculation... (read more)

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  • HIGH ENERGY PHYSICS - THEORY