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/usr/share/pythia8-examples/examples/main07.cmnd is in pythia8-examples 8.1.86-1.2.

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! main07.cmnd.
! This file contains commands to be read in for a Pythia8 run.
! Lines not beginning with a letter or digit are comments.

! 1) Settings used in the main program.
Main:numberOfEvents = 1000         ! number of events to generate
Main:timesAllowErrors = 5          ! allow a few failures before quitting

! 2) Settings related to output in init(), next() and stat().
Init:showChangedSettings = on      ! list changed settings
Init:showChangedParticleData = on  ! list changed particle data
Next:numberCount = 100             ! print message every n events
Next:numberShowInfo = 1            ! print event information n times
Next:numberShowProcess = 1         ! print process record n times
Next:numberShowEvent = 1           ! print event record n times

! 3) Beam parameter settings. Incoming beams do not radiate.
Beams:idA = -11                    ! ficititious incoming e+
Beams:idB = 11                     ! ficititious incoming e-
PDF:lepton = off                   ! no radiation off ficititious e+e-
Beams:eCM = 500.                   ! CM energy of collision

! 4) Set up properties of the GeneralResonance and its decay channels.
! id:all = name antiName spinType chargeType colType m0 mWidth mMin mMax tau0
999999:all = GeneralResonance void 1 0 0 500. 1. 0. 0. 0.
! id:addChannel = onMode bRatio meMode product1 product2 ...
! Note: sum of branching ratios automatically rescaled to 1.
! Current channels illustrative only; insert your own decay list.
999999:addChannel = 1 0.15 101 1 -1   !  -> d dbar
999999:addChannel = 1 0.15 101 6 -6   !  -> t tbar
999999:addChannel = 1 0.15 101 15 -15 !  -> tau- tau+
999999:addChannel = 1 1.15 101 21 21  !  -> g g
999999:addChannel = 1 1.15 101 22 22  !  -> gamma gamma
999999:addChannel = 1 0.15 101 24 -24 !  -> W+ W-
999999:addChannel = 1 0.10 101 25 25  !  -> h0 h0

! 5) Tell that also long-lived should decay.
13:mayDecay   = true                 ! mu+-
211:mayDecay  = true                 ! pi+-
321:mayDecay  = true                 ! K+-
130:mayDecay  = true                 ! K0_L
2112:mayDecay = true                 ! n