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HepMC filter is a simple application that reads a file in HepMC format and selects the events that satisfy certain criteria. The idea is to reduce the number of events we need to process after the selection.
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Getting and Compiling HepMC filter
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At this stage you must have 'HepMC_Filter.exe' in the 'HepMC_Filter/bin' directory. This is the actual filter application.
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- Not at the tau1 machine
1. You will need to download, compile and install the HepMC package. You can get more information here - https://savannah.cern.ch/projects/hepmc/
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3. The remaining steps are similar to the case with the tau1 machine.
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Running the filter
In the 'share' subdirectory you will find 'dilepton_filter.sh'. You need to modify this file to star processing the data.
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4. The filter will stop at some point and you should be able to find skimmed files in the output directory. The running timescale depends on number of events you have in the input. In my case, it was roughly 10 mins for about 100,000 input events.
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Tips & Tricks
- Filter efficiency
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./efficiency.py my_details_output.txt | ||
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Tags
This sections lists different versions of the filter and the criteria applied in them. I am listing here few tags just as an example. You can get the information about each tag using either svn log command or from the web-based interface to SVN - https://svnweb.cern.ch/trac/atlasusr/browser/yuraic/ttH/Projects/HepMC_Filter/tags
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