The settings modules

The default values for the functions and routines contained in the PySmeQcd package and – more specifically – in the PySmeQcd.oneloop module are stored, respectively, in the PySmeQcd.settings and PySmeQcd.oneloop.oneloop_settings modules.

In what follows, we describe each of these settings. Please have a look at the Symbol table for reference on the symbols used below.

Contents:

The PySmeQcd.settings module

Global default settings for the PySmeQcd package.

Theory settings

N = 3

Number of colors N

Nf = 0

Number of fermions N_{f}

xi = 0

Gauge parameter \xi

Renormalization settings

mu0 = 6.099699589795203

Adimensional renormalization scale \mu_{0}

Numerical settings

step_h = 1e-08

Step parameter for numerical derivatives and branch-cut differences

stp = (-1-1j)

Starting point for complex root-finding algorithms

The PySmeQcd.oneloop.oneloop_settings module

Default settings for the SmeQcd.oneloop module.

Diagrams settings

gluetype = 'uc'

Diagram selector for the gluon propagator (full QCD only)

quarktype = 'ms'

Diagram selector for the quark propagator (full QCD only)

Mass settings

m = 0.65577

Gluon mass parameter m, in GeV

x = 0.238171

Quark/gluon mass ratio squared x

K0 = 0.1190625

Normalized and adimensionalized bare quark mass K_{0}/M

Renormalization settings

F0 = -0.876

Gluon polarization additive renormalization constant F_{0}

G0 = 0.14524

Ghost self-energy additive renormalization constant G_{0}

H0 = 2.073

Quark self-energy renormalization constant H_{0}

Zglue = 1

Multiplicative gluon renormalization for the quark propagator Z_{\text{glue}}

Poles and residues

p02 = (0.457525+1.01298j)

Gluon pole p^{2}_{0} in Minkowski space, adimensionalized by the gluon mass parameter m

p0 = (0.88573+0.571833j)

Gluon pole p_{0} in Minkowski space, adimensionalized by the gluon mass parameter m

res_im_re = 3.131629

Ratio Im/Re of the residue of the gluon propagator at its pole, \text{Im}\{R\}/\text{Re}\{R\}

phi = 1.261708

Phase \varphi of the residue of the gluon propagator at its pole