! Vincia tune, April 2020.
! Z fractions in string breaks
StringZ:aLund                       = 0.45 
StringZ:bLund                       = 0.80 
StringZ:aExtraDiquark               = 0.90 
! Z fractions for heavy quarks
StringZ:rFactC                      = 1.15 
StringZ:rFactB                      = 0.85 
! pT in string breaks
StringPT:sigma                      = 0.305
StringPT:enhancedFraction=0.01
StringPT:enhancedWidth              = 2.0
! String breakup flavour parameters
StringFlav:probStoUD                = 0.205
StringFlav:mesonUDvector            = 0.42 
StringFlav:mesonSvector             = 0.53 
StringFlav:mesonCvector             = 1.3  
StringFlav:mesonBvector             = 2.2  
StringFlav:probQQtoQ                = 0.077
StringFlav:probSQtoQQ               = 1.0  
StringFlav:probQQ1toQQ0             = 0.025
StringFlav:etaSup                   = 0.5  
StringFlav:etaPrimeSup              = 0.1  
StringFlav:decupletSup              = 1.0  
StringFlav:popcornSpair             = 0.75 
StringFlav:popcornSmeson            = 0.75 
! Primordial kT
BeamRemnants:primordialKThard       = 0.4 
BeamRemnants:primordialKTsoft       = 0.25
! MB/UE tuning parameters (MPI)
! Use a "low" alphaS and 2-loop running everywhere, also for MPI
SigmaProcess:alphaSvalue            = 0.119
SigmaProcess:alphaSorder            = 2
MultiPartonInteractions:alphaSvalue=0.119
MultiPartonInteractions:alphaSorder = 2
MultiPartonInteractions:pT0ref      = 2.24
MultiPartonInteractions:expPow      = 1.75
MultiPartonInteractions:ecmPow      = 0.21
! Use PYTHIA 8's baseline CR model
ColourReconnection:reconnect        = true
ColourReconnection:range            = 1.75
! Diffraction: switch off Pythia's perturbative MPI
! (colours in diffractive systems not yet handled by Vincia)
Diffraction:mMinPert                = 1000000.0

! Reproduce hadronization behavior of the Pythia version used for this tune.
StringZ:useOldAExtra                = on