ATLAS Support Center

Here are the links to the existing Monte Carlo samples for top-quark studies generated for the 14 TeV center-of-mass energy (pp collisions). Events were generated with the HERWIG++ model, and processed using the Delphes 3.05 fast detector simulation.

All data are stored in the ROOT format using the standard Delphes 3.05 output. Therefore, it is recommended to install Delphes 3.0.5 and look at the example explaining how to read such ROOT files (see the directory “Examples” inside the Delphes package).

The samples use the ATLAS detector geometry located in “examples/delphes_card_ATLAS.tcl” of the Delphes 3.05 installation. There is only one difference: Jets are reconstructed using AntiKT jets with the cone 0.5.

Please read the Section How to download

This is a ttbar fully inclusive sample without any cut on hard processes and without pileup. As before, sqrt(s)=14 TeV, The included processes are:

g g -> t tbar
q qbar -> t tbar

Please read the Section How to download

This is a ttbar fully inclusive sample without any cut on hard processes and without pileup. As before, sqrt(s)=14 TeV, The included processes are:

g g -> t tbar
q qbar -> t tbar

If you need complete log files for a single ROOT file, take it from

1. LHC_signal.log.gz HERWIG++ log file
2. Analysis.log.gz Delphes3 log file

Get the Delphes3 ROOT files from this download link In total, there are 96 files, with 200 ttbar events in each. Thus the total number of events is 19200 signal events.

Here is an example for downloading 5 files:

python download.py 5  delphes3/ttbar_pt1800/signal herwigpp_ttbar_sig_pt1800

(set 5 to 96 to download all)

To reduce ROOT file size, truth information in these ROOT files was slimmed. Please read here.

If you need to find the effect of pileup on top reconstruction or a jet measurement, you need to run the analysis code over signal MC and then over the signal+pileup MC files.

Read analyse_d3

— Sergei Chekanov 2013/03/06 20:47