ATLAS Support Center

Below are ttbar and background MC samples generated for pp collisions at 14 TeV

1. Delphes2.03 for PYTHIA8 and HERWIG++ for high-pT ttbar and high-pT QCD jets (without pileup)
2. Delphes3.0 beta for PYTHIA8. ttbar without pileup

14 TeV pp events, Delphes3.05 and ATLAS-like geometry card with antiKT R=0.5 (“pflow” as input)

1. HERWIG++ for low pT ttbar signal and signal+pileup (140 soft events), 31 pb-1
2. HERWIG++ for high pT ttbar (pT>650 GeV) signal and signal+pileup (140 soft events), 14.5 fb-1
3. HERWIG++ for high pT ttbar (pT>1800 GeV) signal, 140.5 fb-1
4. HERWIG++ pileup events for the signal events used in (1) and (2)
5. HERWIG++ for low pT ttbar signal and signal+pileup (50 soft events), 31 pb-1
6. HERWIG++ for high pT ttbar (pT>650 GeV) signal and signal+pileup (50 soft events), 14.5 fb-1
7. PYTHIA8 for Zprime(3000) to ttbar with mu=0,50,140 pileups
8. PYTHIA8 for single top (s- and t- channels) with mu=0,50,140 pileups

• How to download link shows an automatic way of copying the ROOT files from this server
• How to analyze link explains how to analyze Delphes3 ROOT format
• How to analyze without ROOT link explains how to analyze Delphes outputs without ROOT
• What slims are used link explains what was done to reduce Delphes output
• Accessing truth particles from signal events link explains how to access truth particles ignoring pileup
• How to generate MC samples link explains how to generate fast simulation events with pileups
• How to access objects link explains how to access jets, leptons, missing ET
• How to correct jets for pileup link explains how to apply offset correction for pileup

You can add a new deatures to Delphes using this test HEPMC record. Download a HEPMC file with ttbar (>650 GeV, 14 TeV) for Delphes. Get it from here LHC_signal_ttbar650.hepmc.gz. Test Delphes as:

gunzip LHC_signal_ttbar650.hepmc.gz
DelphesHepMC examples/delphes_card_ATLAS.tcl LHC_ttbar650.root LHC_signal_ttbar650.hepmc

Other samples which without pileup and with pileup (keeping all final state particles) are discussed here

— Sergei Chekanov 2013/03/06 20:47 — Alexandre Vaniachine 2013/03/06 20:47