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Mastrolia, Pierpaolo; Mirabella, Edoardo; Peraro, Tiziano
The journal of high energy physics, 06/2012, Letnik: 2012, Številka: 6Journal Article
A bstract We present a semi-analytic method for the integrand reduction of one-loop amplitudes, based on the systematic application of the Laurent expansions to the integrand-decomposition. In the asymptotic limit, the coefficients of the master integrals are the solutions of a diagonal system of equations, properly corrected by counterterms whose parametric form is known a priori. The Laurent expansion of the integrand is implemented through polynomial division. The extension of the integrand-reduction to the case of numerators with rank larger than the number of propagators is discussed as well.
