[[snowmass2013:montecarlo| <<back]]

==== Single top ====

Here are samples of [[https://cp3.irmp.ucl.ac.be/projects/delphes | Delphes 3.05]] events generated for the **14 TeV** center-of-mass energy (pp collisions). The events are generated for 0 pileup, 50 and 140 pileup scenarios.

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. We use "towers" to build antiKT4 jets. 

The truth information from the signal MC shown above was used to overlay  with 50 pile up events (fixed number, not "Poisson" case!)
The events were overplayed at the HEPMC true level (thanks to Andy Buckley for his help and [[http://pilemc.hepforge.org/]] tool), and then were processed using Delphes 3.05.
 
==== How to download ====

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



==== How files are generated ====

In total, there are 200 single top events per one file.
The following processes are included:
<code>
 q q -> t q (t-channel W+-)
 f fbar -> t tbar (s-channel gamma*/Z0)
 f fbar -> t qbar (s-channel W+-)
</code>
(t-channel dominates). Total luminosity is 0.1 fb.

Look at the log files of PYTHIA8 and Delphes for this runs: [[http://mc.hep.anl.gov/asc/snowmass2013/delphes3/pythia_singletop/logs| Log files]]


===== Single top without pileups =====

Get the Delphes3 ROOT files from  [[http://mc.hep.anl.gov/asc/snowmass2013/delphes3/pythia_singletop/signal | this  download link]]

In total, there are 96 files, with 200 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/pythia_singletop/signal  pythia8_singletop
</code>
(set 5 to 96 to download all)


===== Signal with mu=50 =====

Get the Delphes3 ROOT files from  [[http://mc.hep.anl.gov/asc/snowmass2013/delphes3/pythia_singletop/mu50 | this  download link]]

In total, there are 96 files, with 200 signal 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/pythia_singletop/mu50  pythia8_singletop_mu50
</code>
(set 5 to 96 to download all)


===== Signal with mu=140 =====

Get the Delphes3 ROOT files from  [[http://mc.hep.anl.gov/asc/snowmass2013/delphes3/pythia_singletop/mu140 | this  download link]]

In total, there are 96 files, with signal  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/pythia_singletop/mu140  pythia8_singletop_mu140
</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 20:48//