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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 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 3.0.4 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 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).

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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
==============================================================================

If you need a complete HERWIG++ log file for a single ROOT file, take it from LHC_pileup.log.gz

50-pileup case

Get the ROOT files grouped from 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: 

python download.py 5 delphes3/minbias/mu50/signal_pileup herwigpp_pileup_50mu

140-pileup case

Get the ROOT files grouped from 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: 

python download.py 5 delphes3/minbias/mu140/signal_pileup herwigpp_pileup_140mu

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 analyse_d3

— Sergei Chekanov 2013/03/06 20:48