(r8) WorkBookPATExampleElectron < CMSPublic

CMSPublic Web>SWGuide>WorkBook>WorkBookPAT>WorkBookPATTutorial>WorkBookPATExampleElectron (revision 8) (raw view)~~EditAttachPDF~~

---+ 7.4.1 PAT Examples: Electron Example
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%COMPLETE5%
%BR% [[#ReviewStatus][Detailed Review status]]


---++ Contents

%TOC{title="Content"}%

#InTro
---++ Introduction

In this example you will find how to make a simple analysis (including some more physics contents) with pat::Electrons within a simple EDAnalyzer. You can find the EDAnalyzer and the configuration file in the [[http://cmssw.cvs.cern.ch/cgi-bin/cmssw.cgi/CMSSW/CMS.PhysicsTools/PatExamples/][PatExamples]] package. It will provide you with the following information:

   * how to access information from the pat::Electron.
   * how to determine an electron reconstruction efficiency from simulation.
   * how to estimate an !electronID efficiency applying a simple tag and probe method.

It is required that you have a clear picture of: 

   * how to write an EDAnalyzer (in principle).
   * how to read in parameters from the configuration file.
   * how to clone modules with different parameters in python.
   * how to access a pat::Candidate collection from the event content with an EDAnalyzer.


---++ Run the EDAnalyzer example

If you've done the setup for the [ggNtuplizer][https://twiki.cern.ch/twiki/bin/view/CMSPublic/WorkBookElectronAnalysis#Create_Ntuples_using_the_ggNtupl], 
you should already have the necessary files to run an EDAnalyzer example. 

<pre class="command">
cd CMSSW_9_4_4/src
cmsenv
</pre>

The relevant files for this workbook are in =PhysicsTools/PatExamples and they have the following functionality:
   * plugins/PatElectronAnalyzer.cc: the main module to book and fill histograms.
   * python/PatElectronAnalyzer_cfi.py: initialising configuration file for the plugin.
   * python/tagAndProbeAnalysis_cff.py: simple configuration example for a tag and probe analysis with CMSSW.
   * test/analyzePatElectron_cfg.py: main configuration file for cmsRun
   * test/patElectron_recoEfficiency.C: root macro to display the electron reconstruction efficiency from simulation.
   * test/patElectron_eidEfficiency.C: root macro to display the electronID efficiency from the tag and probe method.

<pre class="command">
cmsRun PhysicsTools/PatExamples/test/analyzePatElectron_cfg.py
</pre>


Compile and run the example as given below:

<verbatim>
scram b 
cmsRun PhysicsTools/PatExamples/test/analyzePatElectron_cfg.py
</verbatim>

You can inspect the outcome using the two root macros which are provided with the example:

<verbatim>
root -l 
.x patElectron_recoEfficiency.C
.x patElectron_eidEfficiency.C
</verbatim>




#ReviewStatus
---++ Review status

| *Reviewer/Editor and Date (copy from screen)* | *Comments* |
| Main.UzzielPerez - 2-Dec-2018 | Update for Run 2, CMSSW 94x |
| Main.RogerWolf -  11 june 2009 | Moved from !SWGuidePATExamples |

%RESPONSIBLE% Main.RogerWolf %BR%
%REVIEW% most recent reviewer and date



-- Main.RogerWolf - 11 Jun 2009

Topic revision: r8 - 2018-12-03 - CiliciaUzzielPerez

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