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On the W^+W^- and bb Rescattering Processes in tt Decay

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We derive a reduction formula whereby the amplitude of the total process of W^+W^- or bb rescattering, following tt pair production and decay, is expressed in terms of products of the amplitudes for each subprocesses. The formula is applicable to general one-loop Feynman amplitudes when the leading Landau singularity occurs with four loop-particles on shell.

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