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arxiv: 0904.2766 · v2 · pith:4YABQSOMnew · submitted 2009-04-17 · ✦ hep-th · hep-ph

Solving for tadpole coefficients in one-loop amplitudes

classification ✦ hep-th hep-ph
keywords coefficientsamplitudesintegralsone-loopadditionalbasiscertaincoefficient
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One-loop amplitudes may be expanded in a basis of scalar integrals multiplied by rational coefficients. We relate the coefficient of the one-point integral to the coefficients of higher-point integrals, by considering the effects of introducing an additional, unphysical propagator, subject to certain conditions.

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