! File: main52.ccmnd ! This file contains commands to be read in for a Pythia8 run. ! Lines not beginning with a letter or digit are comments. ! Names are case-insensitive - but spellings-sensitive! ! The changes here are illustrative, not always physics-motivated. ! 1) Settings that could be used in a main program, if desired. # Beams and collision energy are set up in the fillHepRup() method. Main:numberOfEvents = 100 ! number of events to generate Main:numberToList = 1 ! number of events to print Main:timesToShow = 20 ! show how far along run is this many times Main:timesAllowErrors = 10 ! abort run after this many flawed events Main:showChangedSettings = on ! print changed flags/modes/parameters #Main:showAllSettings = on ! print all flags/modes/parameters Main:showChangedParticleData = on ! print changed particle and decay data #Main:showAllParticleData = on ! print all particle and decay data ! 2) Settings for the hard-process generation. #For Pythia6 processes this has to be done in the fillHepRup() method. ! 3) Switch off some key components of the simulation, for comparisons. #PartonLevel:MI = off ! no multiple interactions #PartonLevel:ISR = off ! no initial-state radiation #PartonLevel:FSRinProcess = off ! no final-state radiation #PartonLevel:FSRinResonances = off ! no FSR in resonance decays #HadronLevel:Hadronize = off ! no hadronization #HadronLevel:Decay = off ! no decays #BeamRemnants:allowJunction = off ! debug only: do not allow junctions #TimeShower:QEDshowerByQ = off ! no photon radiation off quarks #TimeShower:QEDshowerByL = off ! no photon radiation off leptons ! 4) Modify defaults for some key parameters. BeamRemnants:primordialKThard = 2. ! modify primordial kT for hard processes MultipleInteractions:bProfile = 3 ! impact parameter profile MultipleInteractions:expPow = 1.3 ! profile exp( - b^expPow) MultipleInteractions:pT0Ref = 2.5 ! dampening of pT -> 0 divergence #SpaceShower:samePTasMI = false ! set pT0Ref separately or not #SpaceShower:pT0Ref = 3.0 ! dampening of pT -> 0 divergence ! 5) Modify particle data properties. 111:mayDecay = off ! switch off pi0 decays 310:0:bRatio = 0.6895 ! BR(K0_short -> pi+ pi-) 310:1:bRatio = 0.3105 ! BR(K0_short -> pi0 pi0) ! 6) Completely replace or add new particle. (Here update omega.) 223:new = omega void 3 0 0 0.78259 0.00849 0.68 0.90 0.0 223:addChannel = 1 0.8924000 1 211 -211 111 223:addChannel = 1 0.0892800 0 22 111 223:addChannel = 1 0.0170000 3 211 -211 223:addChannel = 1 0.0004900 0 221 22 223:addChannel = 1 0.0000700 0 111 111 22 223:addChannel = 1 0.0005900 0 111 11 -11 223:addChannel = 1 0.0001000 0 111 13 -13 223:addChannel = 1 0.0000700 0 11 -11