Table 3.

The parameters obtained in the fits of the CP5-CR1 and CP5-CR2 tunes, compared with that of the CP5 tune. The upper part of the table displays the fixed input parameters of the tune, whereas the lower part shows the fitted tune parameters. The number of degrees of freedom ($N_{\text{dof}}$) and the goodness of fit divided by $N_{\text{dof}}$ are also shown

pythia  8 parameter	CP5 [13]	CP5-CR1	CP5-CR2
PDF set	NNPDF3.1 NNLO	NNPDF3.1 NNLO	NNPDF3.1 NNLO
${\alpha }_{\text{S}}(m_{\text{Z}})$	0.118	0.118	0.118
SpaceShower:rapidityOrder	On	On	On
MultipartonInteractions:ecmRef [$\text{Ge}\text{V}$ ]	7000	7000	7000
${\alpha }_{\text{S}}^{\text{ISR}}(m_{\text{Z}})$ value/order	0.118/NLO	0.118/NLO	0.118/NLO
${\alpha }_{\text{S}}^{\text{FSR}}(m_{\text{Z}})$ value/order	0.118/NLO	0.118/NLO	0.118/NLO
${\alpha }_{\text{S}}^{\text{MPI}}(m_{\text{Z}})$ value/order	0.118/NLO	0.118/NLO	0.118/NLO
${\alpha }_{\text{S}}^{\text{ME}}(m_{\text{Z}})$ value/order	0.118/NLO	0.118/NLO	0.118/NLO
StringZ:aLund	–	0.38	–
StringZ:bLund	–	0.64	–
StringFlav:probQQtoQ	–	0.078	–
StringFlav:probStoUD	–	0.2	–
SigmaTotal:zeroAXB	Off	Off	Off
BeamRemnants:remnantMode	–	1	–
ColourReconnection:mode	–	1	2
MultipartonInteractions:pT0Ref [$\text{Ge}\text{V}$ ]	1.410	1.375	1.454
MultipartonInteractions:ecmPow	0.033	0.033	0.054
MultipartonInteractions:coreRadius	0.763	0.605	0.649
MultipartonInteractions:coreFraction	0.630	0.445	0.489
ColourReconnection:range	5.176	–	–
ColourReconnection:junctionCorrection	–	0.238	–
ColourReconnection:timeDilationPar	–	8.580	–
ColourReconnection:m0	–	1.721	–
ColourReconnection:m2lambda	–	–	4.917
ColourReconnection:fracGluon	–	–	0.993
$N_{\text{dof}}$	183	157	158
${\chi }^{\ast 2}/N_{\text{dof}}$	1.04	2.37	0.89