# get_squared_amplitude_rcl¶

get_squared_amplitude_rcl(npr, order, pow=None, als=None)

Extracts the computed value of the summed squared amplitude with pow being order in the fundamental couplings at loop-order order for the process with process number npr.

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 Requires to enable IR pole computation via set_compute_ir_poles_rcl() order = ‘NLO-IR2’: loop squared amplitude, IR double pole contribution Requires to enable IR pole computation via set_compute_ir_poles_rcl() pow/als (list/integer) – 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 als $$\propto g_\mathrm{s}^2$$ only (power in $$e$$ is determined automatically from the underlying process) A2 (float)

This routine can be called only after compute_process_rcl for process with process number npr