# get_polarized_squared_amplitude_rcl¶

get_polarized_squared_amplitude_rcl(npr, order, hel, pow=None, als=None)

Extracts a specific contribution to the polarized squared amplitude of the process with process number npr, according to the values of pow (or als), order, colour and hel.

Parameters: npr (int) – process number order (str) – loop-order of the contribution: order = ‘LO’ : tree squared amplitude order = ‘NLO’ : loop squared amplitude order = ‘NLO-D4’: loop squared amplitude, bare loop contribution order = ‘NLO-CT’: loop squared amplitude, counterterms contribution order = ‘NLO-R2’: loop squared amplitude, rational terms contribution order = ‘NLO-IR1’: loop squared amplitude, IR single pole contribution hel (int[l]) – helicity (array) with entries: left-handed fermions/antifermions: -1 right-handed fermions/antifermions: +1 logitudinal vector bosons: 0 transverse vector bosons: -1, +1 scalar particles: 0 pow/gs (int[]) – array with values representing the powers in fundamental couplings in the order as dictated by the model file, e.g. [2, 3] $$\equiv g_\mathrm{s}^2 e^3$$, or, if supported by the model, the power in terms of $$g_\mathrm{s}$$ only (power in $$e$$ is determined automatically from the underlying process) A2 (float)