[1] | 1 | ! main31.cmnd. |
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| 2 | ! This file contains commands to be read in for a Pythia8 run. |
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| 3 | ! Lines not beginning with a letter or digit are comments. |
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| 4 | ! Names are case-insensitive - but spellings-sensitive! |
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| 5 | ! The settings here are illustrative, not always physics-motivated. |
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| 6 | |
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| 7 | ! Number of events - use 0 for all LHEF events in the input file. |
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| 8 | Main:numberOfEvents = 0 |
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| 9 | |
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| 10 | ! Number of events to list and number of errors to allow. |
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| 11 | Next:numberShowLHA = 1 |
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| 12 | Next:numberShowInfo = 1 |
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| 13 | Next:numberShowProcess = 1 |
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| 14 | Next:numberShowEvent = 1 |
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| 15 | Main:timesAllowErrors = 10 |
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| 16 | |
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| 17 | ! List changed settings or particle data. |
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| 18 | Init:showChangedSettings = on |
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| 19 | Init:showChangedParticleData = off |
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| 20 | |
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| 21 | ! Input file. |
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| 22 | Beams:frameType = 4 |
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| 23 | ! t tbar pair production. |
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| 24 | #Beams:LHEF = powheg-hvq.lhe |
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| 25 | ! QCD 2- and 3-jet events. |
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| 26 | Beams:LHEF = powheg-dijets.lhe |
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| 27 | |
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| 28 | ! Number of outgoing particles of POWHEG Born level process |
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| 29 | ! (i.e. not counting additional POWHEG radiation) |
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| 30 | POWHEG:nFinal = 2 |
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| 31 | |
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| 32 | ! How vetoing is performed: |
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| 33 | ! 0 - No vetoing is performed (userhooks are not loaded) |
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| 34 | ! 1 - Showers are started at the kinematical limit. |
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| 35 | ! Emissions are vetoed if pTemt > pThard. |
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| 36 | ! See also POWHEG:vetoCount below |
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| 37 | POWHEG:veto = 1 |
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| 38 | |
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| 39 | ! After 'vetoCount' accepted emissions in a row, no more emissions |
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| 40 | ! are checked. 'vetoCount = 0' means all emissions are checked. |
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| 41 | POWHEG:vetoCount = 3 |
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| 42 | |
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| 43 | ! Selection of pThard (note, for events where there is no |
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| 44 | ! radiation, pThard is always set to be Q_fac): |
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| 45 | ! 0 - pThard = Q_fac |
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| 46 | ! 1 - the pT of the POWHEG emission is tested against all other |
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| 47 | ! incoming and outgoing partons, with the minimal value chosen |
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| 48 | ! 2 - the pT of all final-state partons is tested against all other |
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| 49 | ! incoming and outgoing partons, with the minimal value chosen |
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| 50 | POWHEG:pThard = 2 |
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| 51 | |
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| 52 | ! Selection of pTemt: |
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| 53 | ! 0 - pTemt is pT of the emitted parton w.r.t. radiating parton |
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| 54 | ! 1 - pT of the emission is checked against all incoming and outgoing |
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| 55 | ! partons. pTemt is set to the minimum of these values |
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| 56 | ! 2 - the pT of all final-state partons is tested against all other |
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| 57 | ! incoming and outgoing partons, with the minimal value chosen |
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| 58 | POWHEG:pTemt = 2 |
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| 59 | |
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| 60 | ! Selection of emitted parton for FSR |
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| 61 | ! 0 - Pythia definition of emitted |
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| 62 | ! 1 - Pythia definition of radiator |
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| 63 | ! 2 - Random selection of emitted or radiator |
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| 64 | ! 3 - Both are emitted and radiator are tried |
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| 65 | POWHEG:emitted = 0 |
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| 66 | |
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| 67 | ! pT definitions |
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| 68 | ! 0 - POWHEG ISR pT definition is used for both ISR and FSR |
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| 69 | ! 1 - POWHEG ISR pT and FSR d_ij definitions |
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| 70 | ! 2 - Pythia definitions |
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| 71 | POWHEG:pTdef = 1 |
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| 72 | |
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| 73 | ! MPI vetoing |
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| 74 | ! 0 - No MPI vetoing is done |
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| 75 | ! 1 - When there is no radiation, MPIs with a scale above pT_1 are vetoed, |
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| 76 | ! else MPIs with a scale above (pT_1 + pT_2 + pT_3) / 2 are vetoed |
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| 77 | POWHEG:MPIveto = 0 |
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| 78 | |
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| 79 | ! Further options (optional, for tryout) |
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| 80 | PartonLevel:MPI = off |
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| 81 | HadronLevel:All = off |
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