ATLAS Support Center

Here are top-quark “signal” samples generated by requests for Snowmass 2012-2013. Samples are generated using ANL ATLAS Tier3 computer farm based on Arcond/Condor. Details about the Delphes samples for Snowmass are given in this wiki.

• Delphes 3.08.
• 14 TeV pp collision energy.
• The Snowmass detector geometry See "updateMay8" input cards
• PFlow jets with jet area correction.
• Each sample is generated for <mu>=0,50,140 pileup pileup scenarios (soft events are generated with HERWIG++)

One can view and browser directories with all simulated samples using the ANL Monte Carlo repository. Here is a detailed description:

1. HERWIG++ for low pT ttbar
2. HERWIG++ for ttbar with pT>650 GeV
3. HERWIG++ for QCD dijets with pT>650 GeV <fc #FF0000>New</fc>
4. HERWIG++ for ttbar with pT>650 GeV (finer CAL segmentation in Phi)
5. HERWIG++ for ttbar with pT>1.5 TeV
6. PYTHIA8 for Zprime(3000) to ttbar
7. PYTHIA8 for H0+ttbar
8. Madgraph+Pythia samples <fc #FF0000>New</fc>
   1. ttbar+1 gamma
   2. ttbar+2 gamma
   3. W+2 gamma
   4. Z+2 gamma
   5. ttbar+H→ 2 gamma
9. Madgraph+Pythia samples for Higgs+ttbar <fc #FF0000>New</fc>
   1. ttbar→dileptons
   2. ttbar→lepton+jet
   3. W+2 gamma
   4. Z+2 gamma
10. Madgraph+Pythia samples for Higgs+ttbar (different channels) <fc #FF0000>New</fc>
    1. ttWW + up to 1 parton
    2. ttH, H → tau tau
    3. tt + ll + up to 2 partons, dilepton invariant mass >= 10 GeV
    4. ttH, H → ZZ, generic Z decay + up to 1 parton
    5. ttW + up to 3 partons, generic W decay
    6. ttH, H→WW + up to 1 parton, generic W decay

Warning: most of the models are at the LO level (HERWIG/Pythia8) or with some NLO corrections (Madgraph). You should apply a k-factor to get a correct normalization (can be a phase-space dependent).

Background samples are discussed in Background Samples Twiki.

Truth MC record was removed from the Delphes files to reduce file size. Below you can find a repository with truth MC information: signal, signal+pileup (<mu>=50) and signal+pileup(<mu>=140). Pileup particles are included.

Repository with truth MC information <fc #FF0000>New</fc>

• 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 files
• How to read Delphes data without ROOT link explains how to analyze Delphes outputs without ROOT (and C++)
• 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

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

Here are the samples for ATLAS-like fast simulation using Delphes 3.03 without pileup removal.

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

The SVN link to the white paper is here. You may need to get the Assembla account and contact me to allow the access.

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