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==== Monte Carlo events with the truth information ====


The default Delphes MC samples using the Snowmass detector  do not have the truth information on signal and pileup particles (to save disk space). Here are the MC samples  generated for the **14 TeV** center-of-mass energy (pp collisions) with the complete truth particle information (including pileup final state particles).  Pileup particles are marked with **status=-1**. We also slim events using pT(particle)>0.3 GeV requirement and remove the parton level information (but keeping only first 10 records). There are 10,000 events in each file (ROOT and ProMC)
HEPMC files with and without pileup events are converted to ROOT files and [[http://atlaswww.hep.anl.gov/asc/promc/|ProMC]] format which has a  factor two smaller file size compared to  compressed HEPMC and ROOT files.

  * [[http://mc.hep.anl.gov/asc/snowmass2013/delphes36/?dir=promc_truth | ProMC (converted) repository]] contains  PROMC files after conversion of HEPMC records submitted by the users
  * [[http://mc.hep.anl.gov/asc/snowmass2013/delphes36/?dir=TruthRecords | ProMC (generated) repository]] contains  PROMC files generated for Snowmass. No pileup mixing, only signal events




To view and analyze the truth records,  use  [[http://atlaswww.hep.anl.gov/asc/promc/|ProMC]]. Example: to view complete truth-level information of  Z(3000)-> ttbar process:
<code bash>
wget http://mc.hep.anl.gov/asc/snowmass2013/delphes36/promc_truth/Zprime3000_mu0.promc 
wget  http://atlaswww.hep.anl.gov/asc/promc/download/browser_promc.jar
java -jar browser_promc.jar Zprime3000_mu0.promc
</code>
The last  command can be used to view the information on true rerecord and browser the events (needs Java7 installed). On Windows, click "browser_promc.jar" and select "File->Open".  You need [[http://atlaswww.hep.anl.gov/asc/promc/|ProMC]] package to read and analyze such files in a number of programming languages (C++/Java/Python)

Fully reconstructed Delphes samples (but without the truth info) located [[snowmass2013:analyse_d36_promc|here]]


 --- //[[chekanov@anl.gov|Sergei Chekanov]] 2013/03/06 20:48//
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