ATC: ATLAS Center at ANL

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==== Delphes 3.0(b) and inclusive TTbar sample ====

An experimental MC  set was generated using the most recent Delphes 3.0(b) version which hopefully has correct b-tagging. This is a ttbar fully inclusive sample without any cut on hard subprocesses. As before, sqrt(s)=14 TeV,  The included processes are:
<code>
g g -> t tbar
q qbar -> t tbar
</code>

This run uses the CMS detector geometry located in "examples/delphes_card_CMS.tcl" of the Delphes 3.0(b) installation. The ATLAS geometry is not available.


Here is the log file for 5,000 events (one ROOT file).
<hidden>
<code>
 *-------  PYTHIA Event and Cross Section Statistics  -------------------------------------------------------------*
 |                                                                                                                 |
 | Subprocess                                    Code |            Number of events       |      sigma +- delta    |
 |                                                    |       Tried   Selected   Accepted |     (estimated) (mb)   |
 |                                                    |                                   |                        |
 |-----------------------------------------------------------------------------------------------------------------|
 |                                                    |                                   |                        |
 | g g -> t tbar                                  601 |       55105       4348       4348 |   5.337e-07  4.012e-09 |
 | q qbar -> t tbar                               602 |        7492        652        652 |   8.069e-08  1.567e-09 |
 |                                                    |                                   |                        |
 | sum                                                |       62597       5000       5000 |   6.144e-07  4.307e-09 |
 |                                                                                                                 |
 *-------  End PYTHIA Event and Cross Section Statistics ----------------------------------------------------------*

 *-------  PYTHIA Error and Warning Messages Statistics  ----------------------------------------------------------*
 |                                                                                                                 |
 |  times   message                                                                                                |
 |                                                                                                                 |
 |     10   Error in Pythia::next: hadronLevel failed; try again                                                   |
 |      1   Error in SpaceShower::pT2nearQCDthreshold: stuck in loop                                               |
 |      9   Error in StringFragmentation::fragment: stuck in joining                                               |
 |      1   Error in StringFragmentation::fragmentToJunction: caught in junction flavour loop                      |
 |      3   Warning in MultipartonInteractions::pTnext: weight above unity                                         |
 |      1   Warning in Pythia::check: energy-momentum not quite conserved                                          |
 |      2   Warning in SpaceShower::pT2nextQCD: small daughter PDF                                                 |
 |      7   Warning in SpaceShower::pT2nextQCD: weight above unity                                                 |
 |     17   Warning in StringFragmentation::fragmentToJunction: bad convergence junction rest frame                |
 |                                                                                                                 |
 *-------  End PYTHIA Error and Warning Messages Statistics  ------------------------------------------------------*
== Cross section for this run=6.144e+02 pb
== Events for this run=5000
== Luminosity for this run=8.138e-03 fb-1
</code>
</hidden>

If you need complete log file for a single ROOT file, take it from 
[[http://mc.hep.anl.gov/asc/snowmass2013/pythia8/ttbar14tev/Analysis.log.gz | Analysis.log.gz]]

Get the ROOT files grouped from  [[http://mc.hep.anl.gov/asc/snowmass2013/pythia8/ttbar14tev/ | this  download link]]
In total, there are 160 files, with 5,000 generated events in each. Thus the total number of events is 800,000, which corresponds to 1.3 fb-1 of the luminosity
  

Here is an example for downloading 5 files: 
<code>
python download.py 5 pythia8/ttbar14tev  pythia8_ttbar_14tev
</code>


<note warning>Consider using samples with and without 140 pile up. Go to [[snowmass2013:montecarlo| <<back]]</note>