Towards numerical two-loop integrand reduction
Abstract
We present a method for the integrand-level reduction of two-loop helicity amplitudes in both d=4-2ε and d=4 dimensions. The amplitude is expressed in terms of a set of Feynman integrals and their coefficients that depend on the external kinematics. The analysis presented in this paper, in conjunction with the ongoing development of the computational framework HELAC-2LOOP, paves the road for the construction of an automated program for two-loop amplitude calculations for arbitrary scattering processes.
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