[[snowmass2013:montecarlo| <<back]]

==== Pileup events ====

Here are the links to HERWIG++  samples with pileup (UE) events  generated for the **14 TeV** center-of-mass energy (pp collisions). 
Events were 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 3.0.4]] 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]]



=====  Info ====
 

Here is the log file for 30000 UE events (which were used as a pool of events for 200 signal events).
<hidden>
<code>
Statistics for the UE process:
                                       generated    number of    Cross-section
                                          events     attempts             (nb)
==============================================================================
Total:                                    248527       248527      2.31723e+08
==============================================================================
Per matrix element breakdown:
MEQCD2to2Fast                             248527       248527      2.31723e+08
==============================================================================

==============================================================================
Eikonalized and soft cross sections:

Model parameters:                    ptmin:   3.5973 GeV, mu2: 1.11 GeV2
                                     DL mode: 2, CMenergy: 14000 GeV
hard inclusive cross section (mb):   231.454
soft inclusive cross section (mb):   68.5499
total cross section (mb):            113.95
inelastic cross section (mb):        77.963
soft inv radius (GeV2):              0.382009
slope of soft pt spectrum (1/GeV2):  -0.338063
Average hard multiplicity:           2.96865
Average soft multiplicity:           0.871836
==============================================================================

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>>>>>>>>> ThePEG - Toolkit for HEP Event Generation - version 1.8.1 <<<<<<<<<<
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

==============================================================================
Statistics for event handler 'LHCHandler':
                                       generated    number of    Cross-section
                                          events     attempts             (nb)
==============================================================================
Total (from   weighted events): including vetoed events            84.6(3)e+00
==============================================================================
Total (from unweighted events):            30000        38053      66.7(5)e+00
==============================================================================
Per matrix element breakdown:
MEMinBias                                  30000        38053      66.7(5)e+00
==============================================================================
</code>
</hidden>

If you need a complete HERWIG++ log file for a single ROOT file, take it from 
[[http://mc.hep.anl.gov/asc/snowmass2013/delphes3/minbias/LHC_pileup.log.gz| LHC_pileup.log.gz]]


==== 50-pileup case ====

Get the ROOT files grouped from  [[http://mc.hep.anl.gov/asc/snowmass2013/delphes3/minbias/mu50/signal_pileup | this  download link]]
In total, there are 96 files, with 200 events in each file.
Each event consists of 140 MinBias events

Here is an example for downloading 5 files: 
<code>
python download.py 5 delphes3/minbias/mu50/signal_pileup herwigpp_pileup_50mu
</code>





==== 140-pileup case ====

Get the ROOT files grouped from  [[http://mc.hep.anl.gov/asc/snowmass2013/delphes3/minbias/mu140/signal_pileup | this  download link]]
In total, there are 96 files, with 200 events in each file.
Each event consists of 140 MinBias events

Here is an example for downloading 5 files: 
<code>
python download.py 5 delphes3/minbias/mu140/signal_pileup herwigpp_pileup_140mu
</code>


==== 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//