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! This file contains commands to be read in for a Pythia8 run.
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! Lines not beginning with a letter or digit are comments.
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! Names are case-insensitive - but spellings-sensitive!
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! The changes here are illustrative, not always physics-motivated.
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! 1) Settings used in the main program.
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Main:numberOfEvents = 1000 ! number of events to generate
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Main:timesAllowErrors = 10 ! how many aborts before run stops
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! 2) Settings related to output in init(), next() and stat().
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Init:showChangedSettings = on ! list changed settings
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Init:showChangedParticleData = off ! list changed particle data
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Next:numberCount = 500 ! print message every n events
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Next:numberShowInfo = 3 ! print event information n times
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Next:numberShowProcess = 0 ! print process record n times
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Next:numberShowEvent = 0 ! print event record n times
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! 3) Beam parameter settings. Values below agree with default ones.
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Beams:idA = 2212 ! first beam, p = 2212, pbar = -2212
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Beams:idB = 2212 ! second beam, p = 2212, pbar = -2212
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Beams:eCM = 14000. ! CM energy of collision
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! 4) Settings for the hard-process generation.
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SoftQCD:all = on ! Allow total sigma = elastic/SD/DD/ND
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! Optionally only study one or a few processes at a time.
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#SoftQCD:elastic = on ! Elastic
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#SoftQCD:singleDiffractive = on ! Single diffractive
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#SoftQCD:doubleDiffractive = on ! Double diffractive
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#SoftQCD:centralDiffractive = on ! Central diffractive
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#SoftQCD:minbias = on ! Nondiffractive inelastic
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! 5) Optionally switch on hand-set cross section and Coulomb term.
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! Note: these values are illustrative only, not to be taken seriously.
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#SigmaTotal:setOwn = on ! set your own total/elastic/diffr. sigma
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#SigmaTotal:sigmaTot = 106. ! total cross section (excluding Coulomb)
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#SigmaTotal:sigmaXX = 5. ! reduce double diffractive cross section
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#SigmaElastic:setOwn = on ! suboption for Coulomb term in elastic
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#SigmaElastic:tAbsMin = 4e-5 ! divergence requires lower cutoff
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! 6) Optionally select diffractive model.
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Diffraction:PomFlux = 5 ! the MBR model for diffraction
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! 7) Multiparton interactions and impact parameter picture.
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! Note: these values are illustrative only, not to be taken seriously.
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MultipartonInteractions:pT0Ref = 2.
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MultipartonInteractions:ecmRef = 1960.
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MultipartonInteractions:ecmPow = 0.16
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MultipartonInteractions:pTmin = 0.2
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MultipartonInteractions:bProfile = 2
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#MultipartonInteractions:coreRadius = 0.4
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#MultipartonInteractions:coreFraction = 0.5
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MultipartonInteractions:expPow = 1.
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! 8) Other settings. Can be expanded as desired.
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! Note: may overwrite some of the values above, so watch out.
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#Tune:pp = 6 ! use Tune 4Cx
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examples/main04.cmnd
