2 ! This file contains commands to be read in for a Pythia8 run.
3 ! Lines not beginning with a letter or digit are comments.
4 ! Names are case-insensitive - but spellings-sensitive!
5 ! The settings here are illustrative, not always physics-motivated.
7 ! 1) Settings used in the main program.
8 Main:numberOfEvents = 1000 ! number of events to generate
9 Main:timesAllowErrors = 3 ! how many aborts before run stops
11 ! 2) Settings related to output in init(), next() and stat().
12 Init:showChangedSettings = on ! list changed settings
13 Init:showChangedParticleData = off ! list changed particle data
14 Next:numberCount = 100 ! print message every n events
15 Next:numberShowInfo = 1 ! print event information n times
16 Next:numberShowProcess = 1 ! print process record n times
17 Next:numberShowEvent = 0 ! print event record n times
19 ! 3) Beam parameter settings. Values below agree with default ones.
20 Beams:idA = 2212 ! first beam, p = 2212, pbar = -2212
21 Beams:idB = 2212 ! second beam, p = 2212, pbar = -2212
22 Beams:eCM = 14000. ! CM energy of collision
24 ! 4) Settings for the hard-process generation.
26 ! Example 1: QCD + prompt photon production; must set pTmin.
27 HardQCD:all = on ! switch on all QCD jet + jet processes
28 PromptPhoton:all = on ! swich on gamma + jet and gamma + gamma
29 PhaseSpace:pTHatMin = 50. ! minimal pT scale in process
31 ! Example 2: t-tbar production.
32 #Top:gg2ttbar = on ! g g -> t tbar
33 #Top:qqbar2ttbar = on ! q qbar -> t tbar
35 ! Example 3: Z0 production; should set mMin.
36 #WeakSingleBoson:ffbar2gmZ = on ! q qbar -> gamma*/Z0
37 #PhaseSpace:mHatMin = 50.
39 ! Example 4: gauge boson pair production; set pTmin. Not yet complete.
40 #WeakDoubleBoson:ffbar2ZW = on ! q qbar -> Z0 W+-
41 #WeakDoubleBoson:ffbar2WW = on ! q qbar -> W+ W-
42 #PhaseSpace:pTHatMin = 20. ! minimal pT scale in process
44 ! 5) Switch on/off the key event generation steps.
45 #PartonLevel:MPI = off ! no multiparton interactions
46 #PartonLevel:ISR = off ! no initial-state radiation
47 #PartonLevel:FSR = off ! no final-state radiation
48 #HadronLevel:Hadronize = off ! no hadronization
49 #HadronLevel:Decay = off ! no decays
51 ! 6) Other settings. Can be expanded as desired.
52 #Tune:preferLHAPDF = off ! use internal PDFs when LHAPDF not linked
53 Tune:pp = 6 ! use Tune 4Cx
54 ParticleDecays:limitTau0 = on ! set long-lived particle stable ...
55 ParticleDecays:tau0Max = 10 ! ... if c*tau0 > 10 mm