HepMC filter

HepMC filter

HepMC filter is a simple application that reads a file in HepMC format and selects only those events that pass certain cuts. The idea is to reduce a number of events we need to process after the selection.

Getting and Compiling the HepMC filter

* On tau1.hep.utexas.edu:

NOTE: To download the source file you need to have an access to ATLAS Subversion system.

1. Set up SVNROOT system variable that points to the ATLAS user's repository

export SVNROOT=svn+ssh://<username>@svn.cern.ch/reps/atlasusr

where <username> is your username on ATLAS.

2. Check-out the package from SVN

svn co $SVNROOT/yuraic/ttH/Projects/HepMC_Filter/trunk HepMC_Filter

This will create HepMC_Filter directory and check-out a package in it. If you want to check-out a version with certain tag, use the following command

svn co $SVNROOT/yuraic/ttH/Projects/HepMC_Filter/tags/HepMC_Filter-00-00-03 HepMC_Filter

This will check-out version HepMC_Filter-00-00-03 of the HepMC filter.
3. Source the setup.file

cd HepMC_Filter
source setup.sh

4. Compile the filter

gmake
gmake clean

At this stage you must have 'HepMC_Filter.exe' in the 'HepMC_Filter/bin' directory. This is the actual filter application.

Running the filter

In the 'share' subdirectory you will find 'dilepton_filter.sh'. You need to modify this file to star processing the data.

1. Open 'dilepton_filter.sh'

vim dilepton_filter.sh

2. Set up the correct paths to the 'input_dir' and 'output_dir' variables

input_dir=<input_files_dir>
output_dir=<output_files_dir>

where <input_files_dir> - path to the directory containing input HepMC files, and <output_files_dir> is the directory where output files will be placed.

NOTE: Input files must have *.hepmc extension. The extension for the output will be also *.hepmc.

3. Run the 'dilepton_filter.sh' script redirecting its output to my_details_output.txt

./dilepton_filter.sh >& my_details_output.txt

• Filter efficiency
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