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0001 ! sPHENIX HF TG MD2 Pythia8 Tune -- p+p 200 GeV, inelastic INCLUDING central diffraction
0002 ! See discussions at https://indico.bnl.gov/event/10309/
0003
0004 ! Beam settings
0005 Beams:idA = 2212 ! first beam, p = 2212, pbar = -2212
0006 Beams:idB = 2212 ! second beam, p = 2212, pbar = -2212
0007 Beams:eCM = 200. ! CM energy of collision
0008
0009 ! Settings related to output in init(), next() and stat()
0010 Init:showChangedSettings = on
0011 Init:showAllSettings = off
0012 Next:numberCount = 100000 ! print message every n events
0013 Next:numberShowInfo = 0 ! print event information n times
0014 #Next:numberShowProcess = 1 ! print process record n times
0015 Next:numberShowEvent = 0 ! print event record n times
0016
0017 ! PDF (Detroit tune: NNPDF3.1 QCD LO, alpha_s(M_Z) = 0.130 -> pSet 17 in 8.3xx)
0018 PDF:pSet = 17
0019 MultipartonInteractions:bProfile = 2
0020 MultipartonInteractions:ecmRef = 200
0021 MultipartonInteractions:pT0Ref = 1.40
0022 MultipartonInteractions:ecmPow = 0.135
0023 MultipartonInteractions:coreRadius = 0.56
0024 MultipartonInteractions:coreFraction = 0.78
0025 ColourReconnection:range = 5.4 ! NOTE: only used by ColourReconnection:mode = 0
0026
0027 ! Process
0028 SoftQCD:inelastic = on ! codes 101, 103, 104, 105, 106
0029
0030 ! Central diffraction (code 106, p p -> p X p, double-Pomeron exchange).
0031 ! SoftQCD:inelastic already *enables* code 106, but every PYTHIA tune -- including
0032 ! the default -- forces sigma_CD = 0 via SigmaTotal:zeroAXB = on, so no code-106
0033 ! event is ever produced unless this flag is switched off. It must appear AFTER
0034 ! any Tune:pp / Tune:ee selection. Turning it on leaves sigma_tot unchanged and
0035 ! takes the CD cross section out of the non-diffractive one
0036 ! (sigma_ND = sigma_tot - sigma_el - sigma_XB - sigma_AX - sigma_XX - sigma_AXB),
0037 ! so the ND phenomenology shifts by ~sigma_CD/sigma_ND, i.e. a couple of percent.
0038 SigmaTotal:zeroAXB = off
0039
0040 ! K factor for inelastic processes
0041 MultipartonInteractions:Kfactor = 1.0
0042
0043 ! Cuts
0044 #PhaseSpace:pTHatMin = 10.0
0045 ! NOTE: xyMax / zMax below are only read when limitCylinder = on, so as written
0046 ! these three lines are a no-op and every unstable particle (K0S, Lambda, ...)
0047 ! decays.
0048 ParticleDecays:limitCylinder = off
0049 ParticleDecays:xyMax = 0.000001
0050 ParticleDecays:zMax = 0.000001
0051
0052 ColourReconnection:mode = 2 ! gluon-move model
0053 TimeShower:alphaSvalue = 0.18
0054
0055 ! Main:numberOfEvents = 200000
