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Tutorial to make Full Simulation at High Pileup Scenarios

This tutorial illustrates the simulation of neutrino samples with pileup 70 considering upgraded geometry for the pixel detector (4-layers, 3-disks).

Generation of events

We are going to simulate Neutrinos with Pt 2-20 according to this configuration fragment

ssh jruizvar@lxplus5.cern.ch
cmsrel CMSSW_6_1_2_SLHC6_patch1
cd CMSSW_6_1_2_SLHC6_patch1/src
source script.sh

script.sh requires Bash terminal.

Copy the following configure file (in CMSSW_6_1_2_SLHC6_patch1/src)

Before submitting the job to crab using

do a local test

scram b -j 8
cmsRun Neutrino_Pt2to20_gun_cff_py_GEN_SIM.py

Check edmFileUtil Neutrino_Pt2to20_gun_cff_py_GEN_SIM.root. This file is only to test and can be removed (rm Neutrino_Pt2to20_gun_cff_py_GEN_SIM.root)

Submit to crab

crab -create
crab -submit -c Neutrino_Pt2to20_14TeV

It takes around 15 min to generate 10000 events. 0.2M events can be generated in 20 jobs. After crab getoutput, don't forget

crab -publish -c Neutrino_Pt2to20_14TeV

Create Analyzer

We are going to create an standalone analyzer (no need to checkout external libraries) that can be used with any GEN-SIM sample, not only neutrinos.

ssh jruizvar@lxplus5.cern.ch
cmsrel CMSSW_6_1_2_SLHC6_patch1
cd CMSSW_6_1_2_SLHC6_patch1/src
source script.sh

Same script.sh as above. Make a directory with a dummy name, in this case neutrinoPU70. Create an analyzer respecting the name Pxecal

mkdir neutrinoPU70
mkedanlzr Pxecal
cd Pxecal

Copy to this folder the following files

Run a local test and check the resulting n-tuple Neutrino_PU70_ntuple.root

scram b -j 8
cmsRun pxecal_cfg.py
root -l Neutrino_PU70_ntuple.root
   [0] NtupleMaker->cd()
   [1] t->Draw("sqrt(ClGx*ClGx+ClGy*ClGy):ClGz")
   [2] .q
rm Neutrino_PU70_ntuple.root

If local run succeeds, you can create and submit the jobs

crab -create
crab -submit 1-500 -c Neutrino_PU70_100K_ntuple
crab -submit 501-1000 -c Neutrino_PU70_100K_ntuple

This step is more time consuming than the generation part. No need to publish because the output are n-tuples stored at T2_BR_SPRACE for private analysis.

Example plots

  • Distribution of the cluster size for two pileup scenarios. Neutrino samples with 5000 events were considered.


Make the full simulation for a SingleElectronFlatPt5To50 for three pileup scenarios:

  • PU35 (200K events)
  • PU70 (100K events)
  • PU140 (50K events)


  • The GEN-SIM step should be done only once.
  • The python configure files should be slightly modified.
  • No need to touch the Pxecal.cc source file.
Topic attachments
I Attachment History Action Size Date Who Comment
Texttxt BuildFile.xml.txt r1 manage 0.4 K 2013-08-28 - 07:26 JoseRuiz BuildFile
Texttxt MinBiasSource.py.txt r1 manage 108.2 K 2013-08-28 - 05:29 JoseRuiz Official MinBias
Texttxt Neutrino_Pt2to20_gun_cff_py_GEN_SIM.py.txt r1 manage 4.8 K 2013-08-28 - 06:22 JoseRuiz Configure file to make GEN-SIM
Unknown file formatcc Pxecal.cc r1 manage 14.1 K 2013-08-28 - 05:31 JoseRuiz Source code
PNGpng Screen_Shot_2013-08-28_at_10.02.51_AM.png r1 manage 84.1 K 2013-08-28 - 08:05 JoseRuiz Generator fragment
Unknown file formatcfg crab.cfg r1 manage 0.8 K 2013-08-28 - 05:28 JoseRuiz Crab configure file
Unknown file formatcfg crabGENSIM.cfg r1 manage 0.7 K 2013-08-28 - 06:30 JoseRuiz Crab configure file to generate and publish GEN-SIM
GIFgif dist.gif r1 manage 196.0 K 2013-09-09 - 22:26 JoseRuiz  
Texttxt pxecal_cfg.py.txt r1 manage 6.4 K 2013-08-28 - 05:29 JoseRuiz Configure file
Unix shell scriptsh script.sh r1 manage 0.1 K 2013-08-28 - 05:29 JoseRuiz Setup crab at lxplus
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Topic revision: r4 - 2013-09-09 - JoseRuiz

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