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CMS "short-term" version of Delphes - starting with ECFA_v2
This project forked from sethzenz/delphes
CMS "short-term" version of Delphes - starting with ECFA_v2
GETTING STARTED WITH CMS VERSION OF DELPHES =========================================== Set up GitHub per instructions on http://cms-sw.github.io/cmssw/usercode-faq.html (and linked pages) Then do: git clone https://github.com/sethzenz/Delphes.git cd Delphes ./configure make Quick start with Delphes ======================== Commands to get the code: wget http://cp3.irmp.ucl.ac.be/downloads/Delphes-3.0.10.tar.gz tar -zxf Delphes-3.0.10.tar.gz Commands to compile the code: cd Delphes-3.0.10 make Finally, we can run Delphes: ./DelphesHepMC Command line parameters: ./DelphesHepMC config_file output_file [input_file(s)] config_file - configuration file in Tcl format output_file - output file in ROOT format, input_file(s) - input file(s) in HepMC format, with no input_file, or when input_file is -, read standard input. Let's simulate some Z->ee events: wget http://cp3.irmp.ucl.ac.be/downloads/z_ee.hep.gz gunzip z_ee.hep.gz ./DelphesSTDHEP examples/delphes_card_CMS.tcl delphes_output.root z_ee.hep or curl -s http://cp3.irmp.ucl.ac.be/downloads/z_ee.hep.gz | gunzip | ./DelphesSTDHEP examples/delphes_card_CMS.tcl delphes_output.root For more detailed documentation, please visit https://cp3.irmp.ucl.ac.be/projects/delphes/wiki/WorkBook Simple analysis using TTree::Draw ================================= Now we can start ROOT and look at the data stored in the output ROOT file. Start ROOT and load Delphes shared library: root -l gSystem->Load("libDelphes"); Open ROOT file and do some basic analysis using Draw or TBrowser: TFile::Open("delphes_output.root"); Delphes->Draw("Electron.PT"); TBrowser browser; Note 1: Delphes - tree name, it can be learned e.g. from TBrowser Note 2: Electron - branch name; PT - variable (leaf) of this branch Complete description of all branches can be found in doc/RootTreeDescription.html This information is also available at https://cp3.irmp.ucl.ac.be/projects/delphes/wiki/WorkBook/RootTreeDescription Macro-based analysis ==================== Analysis macro consists of histogram booking, event loop (histogram filling), histogram display. Start ROOT and load Delphes shared library: root -l gSystem->Load("libDelphes"); Basic analysis macro: { // Create chain of root trees TChain chain("Delphes"); chain.Add("delphes_output.root"); // Create object of class ExRootTreeReader ExRootTreeReader *treeReader = new ExRootTreeReader(&chain); Long64_t numberOfEntries = treeReader->GetEntries(); // Get pointers to branches used in this analysis TClonesArray *branchElectron = treeReader->UseBranch("Electron"); // Book histograms TH1 *histElectronPT = new TH1F("electron pt", "electron P_{T}", 50, 0.0, 100.0); // Loop over all events for(Int_t entry = 0; entry < numberOfEntries; ++entry) { // Load selected branches with data from specified event treeReader->ReadEntry(entry); // If event contains at least 1 electron if(branchElectron->GetEntries() > 0) { // Take first electron Electron *electron = (Electron*) branchElectron->At(0); // Plot electron transverse momentum histElectronPT->Fill(electron->PT); // Print electron transverse momentum cout << electron->PT << endl; } } // Show resulting histograms histElectronPT->Draw(); } More advanced macro-based analysis ================================== The 'examples' directory contains ROOT macros Example1.C, Example2.C and Example3.C. Here are the commands to run these ROOT macros: root -l .X examples/Example1.C("delphes_output.root"); or root -l examples/Example1.C\(\"delphes_output.root\"\)
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