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 #==============================================================================
 # STAR Heavy Flavor Tune 1.1
 #
 # PYTHIA Version 8.1.08
 # Date:  November 7, 2008       
 # Last updated by: Thomas Ullrich
 #
 # 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!
 #
 # Important notes:
 # ================
 # For hard 2->2 processes, such as most heavy flavor producing one,
 # there's  divergence in PYTHIA that needs to be suppressed. Use
 # these two lines in the code before you initialize PYTHIA to avoid
 # any trouble: 
 # UserHooks *oniumUserHook = new SuppressSmallPT();
 # pythia.setUserHooksPtr(oniumUserHook);
 #
 #==============================================================================
 
 #------------------------------------------------------------------------------
 # Parameters that need to be set by whoever runs it.
 # Note that they have no meaning unless restored and used
 # in the user provided code (main program).
 # This is not part of the star_hf tune (just convenient)
 # Documentation: <pyhiadir>/htmldoc/MainProgramSettings.html
 #------------------------------------------------------------------------------
 Main:numberOfEvents = 1000       ! number of events to generate
 Next:numberShowEvent = 20             ! show event record
 Next:numberCount = 0              ! number of events to print
 Next:numberShowInfo = 100             ! show how far along run is this many times
 Main:timesAllowErrors = 100        ! abort run after this many flawed events
 Init:showChangedSettings = on      ! print changed flags/modes/parameters
 Init:showAllSettings = on          ! print all flags/modes/parameters
 #Init:showAllStatistics = on        ! print statistics at the end
 
 #------------------------------------------------------------------------------
 # Colliding beams and center-of-mass energy
 # Documentation: <pyhiadir>/htmldoc/BeamParameters.html
 #------------------------------------------------------------------------------
 Beams:frameType = 2
 Beams:idA = 2212                   ! proton
 Beams:idB = 11                 ! e-
 Beams:eA = 275.                  ! RHIC nominal (GeV)
 Beams:eB = 18.                  ! RHIC nominal (GeV)
 
 #------------------------------------------------------------------------------
 # Process Selection
 #------------------------------------------------------------------------------
 
 
 # Enable equivalent photon approximation (EPA) for both beams
 Photon:Q2Max = 1.0                ! Upper Q^2 limit for EPA photons (in GeV^2)
 Photon:ProcessType = 4    ! 4 = direct-direct photons
 #Photon:EPA = on
 
 PDF:beamA2gamma = on    ! EPA photon flux from beam A
 PDF:beamB2gamma = on    ! EPA photon flux from beam B
 
 # Enable gamma-gamma -> mu+ mu−
 PhotonCollision:gmgm2mumu = on
 
 # Optional: Turn off other QED or QCD backgrounds if you want exclusivity
 PartonLevel:ISR = off
 PartonLevel:FSR = off
 HadronLevel:all = off
 
 
 #------------------------------------------------------------------------------
 # K factor
 # Multiply almost all cross sections by this common fix factor.
 # This is usually no very useful. The data can be shifted up and down
 # later anyhow as we please. 
 # Documentation: <pyhiadir>/htmldoc/CouplingsAndScales.html
 #------------------------------------------------------------------------------
 # SigmaProcess:Kfactor = 3
 
 #------------------------------------------------------------------------------
 # Scales (Ramona's suggestions)
 # This sets the scale to settings typically for hard probes:
 # mu_F = mu_R = 2*mT
 # Documentation: <pyhiadir>/htmldoc/CouplingsAndScales.html
 #------------------------------------------------------------------------------
 # SigmaProcess:renormScale2 = 3
 # SigmaProcess:factorScale2 = 3
 # SigmaProcess:renormMultFac = 2   ! 2mT
 # SigmaProcess:factorMultFac = 2   ! 2mT
 
 #------------------------------------------------------------------------------
 # To limit particle production to a certain pthat range uncomment
 # these lines. Use only when you 100% know what you are doing.
 # It is extremely useful to split runs up in ptHat bins to generate
 # statistics evenly in pt. Book keeping is important then (cross-sections,
 # number of events) to compile the final complete spectra.
 # Documentation: <pyhiadir>/htmldoc/PhaseSpaceCuts.html
 #------------------------------------------------------------------------------
 # PhaseSpace:pTHatMin = 4               ! Minimal pT cut
 # PhaseSpace:pTHatMax = 2
 
 #------------------------------------------------------------------------------
 # Random Number
 # Initialize random generator according to time. Otherwise multiple jobs
 # will produce the same sequence (unless you pass a different seed every
 # time which is not practical).
 # Documentation: <pyhiadir>/htmldoc/RandomNumberSeed.html
 #------------------------------------------------------------------------------
 Random:setSeed = on
 Random:seed = 0
 
 #------------------------------------------------------------------------------
 # PDF Selection:
 # Note: you need LHAPDF to be installed. Pythia 8 only provides a 
 # minimal set to get started.
 # The choice of PDF here is greatly motivated by:
 # A.~Sherstnev and R.~S.~Thorne, arXiv:0807.2132 and arXiv:0711.2473v3
 # and W. Vogelsang (private communication)
 # These are PDFs especially made for LO Monte-Carlo generators such
 # as PYTHIA.
 # The state-of-the-art NLO PDF is cteq66.LHgrid which can be used
 # as an alternative (also from LHAPDF) but with the known problems
 # that arise when using a NLO PDF in an LO simulator.
 # Documentation: <pyhiadir>/htmldoc/PDFSelection.html
 #------------------------------------------------------------------------------
 #PDF:useLHAPDF = off
 #PDF:LHAPDFset = MRSTMCal.LHgrid
 #PDF:extrapolateLHAPDF = on
 #PDF:pSet = 8
 #PDF:beamA2gamma = on
 
 #------------------------------------------------------------------------------
 # Settings for the event generation process in the Pythia8 library
 # Effect/Relevance of MI, ISR and FSR need to be checked. For sure
 # the use more CPU and hence less events/s.
 # If HadronLevel:Hadronize = off we end up with the pure c, b spectra
 # (which might be useful at times)
 # Documentation: <pyhiadir>/htmldoc/MasterSwitches.html
 # Documentation: <pyhiadir>/htmldoc/MultipleInteractions.html
 #------------------------------------------------------------------------------
 #PartonLevel:MPI = on              ! multiple interactions
 #PartonLevel:ISR = on             ! initial-state radiation 
 #BeamRemnants:primordialKT = on   ! primordial kt
 #PartonLevel:FSR = on             ! final-state radiation
 #HadronLevel:Hadronize = off     ! no hadronization use
 
 #------------------------------------------------------------------------------
 # Relative production ratio vector/pseudoscalar for charm and bottom mesons
 # This was originally PARJ(13) where PARJ(13) = V/(PS+V) that is the 
 # vector meson  fraction of primary charm+bottom mesons. 
 # Andre David (CERN/NA60) made an exhaustive study and found that the
 # world data supports 0.6 while PYTHIA default was PARJ(13) = 3/4 = 0.75
 # from simple spin counting.
 # In PYTHIA8 we now use V/PS not V/(PS+V)
 # Documentation: <pyhiadir>/htmldoc/FlavourSelection.html
 #------------------------------------------------------------------------------
 #StringFlav:mesonCvector = 1.5    ! same as PARJ(13)=0.6
 #StringFlav:mesonBvector = 3      ! leave at 0.75 
 
 #------------------------------------------------------------------------------
 # Heavy quark masses.
 # Note that this should match with the ones used in the PDF.
 # The masses are listed in the header of the refering PDF file.
 # Documentation: <pyhiadir>/htmldoc/ParticleDataScheme.html
 # Documentation: <pyhiadir>/htmldoc/ParticleData.html
 #------------------------------------------------------------------------------
 #4:m0 = 1.43
 #5:m0 = 4.30
 
 #------------------------------------------------------------------------------
 # Particle Decay limits
 # When on, only particles with a decay within a volume limited by 
 # rho = sqrt(x^2 + y^2) < xyMax and |z| < zMax are decayed. 
 # The above xyMax, expressed in mm/c.
 #------------------------------------------------------------------------------
 # ParticleDecays:limitCylinder = on
 # ParticleDecays:xyMax = 600
 # ParticleDecays:zMax = 1000
 
 # EOF

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