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Two-loop Integrand Decomposition into Master Integrals and Surface Terms · Around

2015

Two-loop Integrand Decomposition into Master Integrals and Surface Terms

Ita, Harald

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Loop amplitudes are conveniently expressed in terms of master integrals whose coefficients carry the process dependent information.

Similarly before integration, the loop integrands may be expressed as a linear combination of propagator products with universal numerator-tensors.
Such a decomposition is an important input for the numerical unitarity approach, which constructs integrand coefficients from on-shell tree amplitudes.
We present a new method to organise multi-loop integrands into a direct sum of terms that integrate to zero (surface terms) and remaining master integrands.

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