[[snowmass2013:montecarlo| <<back]]

==== Very high  ttbar (>1800 GeV) ====

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  [[https://herwig.hepforge.org/|HERWIG++]] model,
and processed using the [[https://cp3.irmp.ucl.ac.be/projects/delphes | Delphes 3.05]] fast detector simulation.

All data  are stored in the  ROOT format  using the standard [[https://cp3.irmp.ucl.ac.be/projects/delphes | Delphes 3.05]] output.
Therefore, it is recommended to install [[https://cp3.irmp.ucl.ac.be/projects/delphes | 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.**


==== How to download ====

Please read the Section [[snowmass2013:download| How to download]]


=====  Signal ttbar ====

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:
<code>
g g -> t tbar
q qbar -> t tbar
</code>


==== How to download ====

Please read the Section [[snowmass2013:download| How to download]]


=====  Signal ttbar ====

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:
<code>
g g -> t tbar
q qbar -> t tbar
</code>



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

  - [[http://mc.hep.anl.gov/asc/snowmass2013/delphes3/ttbar_pt1800/LHC_signal.log.gz | LHC_signal.log.gz]] HERWIG++ log file
  - [[http://mc.hep.anl.gov/asc/snowmass2013/delphes3/ttbar_pt1800/Analysis.log.gz | Analysis.log.gz]] Delphes3 log file


Get the Delphes3 ROOT files from  [[http://mc.hep.anl.gov/asc/snowmass2013/delphes3/ttbar_pt1800/signal | 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: 
<code>
python download.py 5  delphes3/ttbar_pt1800/signal herwigpp_ttbar_sig_pt1800
</code>
(set 5 to 96 to download all)

==== Info about true particle record ====


To reduce ROOT file size, truth information in these ROOT files was slimmed. Please read [[snowmass2013:pileup_truth_d3| here]].

==== How to analyze ====

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 [[snowmass2013:analyse_d3]]



 --- //[[chekanov@anl.gov|Sergei Chekanov]] 2013/03/06 20:47//