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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