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 ofpow
(orals
),order
,colour
andhel
.Parameters:  npr (int) – process number
 order (str) –
looporder of the contribution:
 order = ‘LO’ : tree squared amplitude
 order = ‘NLO’ : loop squared amplitude
 order = ‘NLOD4’: loop squared amplitude, bare loop contribution
 order = ‘NLOCT’: loop squared amplitude, counterterms contribution
 order = ‘NLOR2’: loop squared amplitude, rational terms contribution
 order = ‘NLOIR1’: loop squared amplitude, IR single pole contribution
 hel (int[l]) –
helicity (array) with entries:
 lefthanded fermions/antifermions: 1
 righthanded 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)
Returns: A2
Return type: (float)