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Unitarity-Cuts, Stokes' Theorem and Berry's Phase (1001.3156v1)
Published 18 Jan 2010 in hep-ph
Abstract: Two-particle unitarity-cuts of scattering amplitudes can be efficiently computed by applying Stokes' Theorem, in the fashion of the Generalised Cauchy Theorem. Consequently, the Optical Theorem can be related to the Berry Phase, showing how the imaginary part of arbitrary one-loop Feynman amplitudes can be interpreted as the flux of a complex 2-form.
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