Warning, /analysis/HerwigToHepMCProduction/README is written in an unsupported language. File is not indexed.
0001 ########################################## Herwig to HepMC File Generator ###########################################################
0002
0003 Author: Skaydi
0004 Last Update 13 January 2026
0005
0006
0007 This is a stop gap solution to allow for the generation of HepMC files from a Herwig input.
0008 Temporary fix before "PHHerwig" can be properly implemented
0009
0010 How it works is generate a .run file, run the makeHerwigJobs script and give it the parameters relevant to the run (run with help option at first for explination of the behavior)
0011 this will generate a number of events broken into a set number of files with an equal number of events per file, triggers for Jets can be optionally employed
0012 #Directories
0013 The directories are broken down as follows
0014
0015 ##config_files
0016
0017 This is where the Herwig input (.in) and run (.run) files live as
0018
0019 After adding a new ".in" File simply do /cvmfs/sphenix.sdcc.bnl.gov/gcc-12.1.0/opt/sphenix/core/Herwig/bin/Herwig read [.in File name]
0020
0021 ## HepMCTrigger
0022
0023 This has the Jet trigger that is implemented on the HepMC output, eventually will add other triggers.
0024 This is based on anti-kt r=0.4 jets from fastjet
0025
0026 ## HerwigHepMCFilter
0027
0028 A specific instance of running the filter that applies a trigger and a set event output per file number
0029
0030 "Run
0031
0032 ## HepMC_scripts
0033
0034 This is where the main usage is.
0035
0036 "condor_blank.job" should be updated for the user
0037
0038 "condor_file_dir" this is where the condor files go.
0039
0040 "Herwig_run.sh" this is what the condor job calls, runs events with a random seed and optionally applies a triger
0041
0042 "makeHerwigJobs.sh" script to input parameters of the run
0043 This script runs Herwig to create HepMC files given an input configuration
0044 Options:
0045
0046 -h, --help Display this help message
0047 -v, --verbose Enable verbose job creation (Default false)
0048 -N, --events Number of events to generate (Default 1M)
0049 -n, --perfile Number of events per file (Default 1k)
0050 -s, --submit Make and submit condor jobs (Default false)
0051 -t, --trigger Input type (MB, Jet10, Jet20, Jet30, PhotonJet5, PhotonJet10, PhotonJet20) (Default MB)
0052 -j, --jetcut Add a Jet cut filter [Integer GeV] (Default None)
0053 -p, --photoncut Add a photon cut filter [Integer GeV] (Default None)
0054 -i, --input Specify new input file (Default blank)
0055
0056
0057
0058 ####################################### USAGE ##########################################
0059
0060 To use and understand this package is relatively staightforwards
0061
0062 # -----------------STEPS----------------------
0063 ##Step 1
0064 Activate local LHAPATH (needed for Nashville tune)
0065 export LHAPATH=$(pwd)/HerwigToHepMCProduction/config_files:$LHAPATH
0066 export LHAPDF_DATA_PATH=$(pwd)/config_files:$LHAPDF_DATA_PATH
0067 ##Step 2
0068 run the script
0069 cd HepMC_scripts
0070 ./makeHeriwgJobs.sh [options listed above]
0071 ##Step 3
0072 Interpreting the cross section
0073 For the cross sections, those are output in a text file
0074 "Cross_Section_[TAG].txt"
0075
0076 ### A note on cross sections
0077 So in order to keep a fixed 1000 good events per DST for reconstruction, the filter requires that we construct far too many events
0078 The cross section is calculated by taking the output cross section from the Herwig generator, and scaling it
0079
0080 XS/N = XS_HERWIG / N_Generated * 1000 / N_passing_filter
