TopMuonFWLiteAnalyzer.cc

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#include <memory>
#include <string>
#include <cstdlib>
#include <sstream>
#include <fstream>
#include <iostream>

#include "FWCore/FWLite/interface/FWLiteEnabler.h"
#include "DataFormats/PatCandidates/interface/Muon.h"
#include "DataFormats/PatCandidates/interface/Electron.h"

#include "TopQuarkAnalysis/Examples/bin/NiceStyle.cc"
#include "TopQuarkAnalysis/Examples/interface/RootSystem.h"
#include "TopQuarkAnalysis/Examples/interface/RootHistograms.h"
#include "TopQuarkAnalysis/Examples/interface/RootPostScript.h"

int main(int argc, char* argv[]) {
  if (argc < 3) {
    // -------------------------------------------------
    std::cerr << "ERROR:: "
              << "Wrong number of arguments! Please specify:" << std::endl
              << "        * filepath" << std::endl
              << "        * process name" << std::endl;
    // -------------------------------------------------
    return -1;
  }

  // load framework libraries
  gSystem->Load("libFWCoreFWLite");
  FWLiteEnabler::enable();

  // set nice style for histograms
  setNiceStyle();

  // define some histograms
  TH1I* noMuons = new TH1I("noMuons", "N(Muon)", 10, 0, 10);
  TH1I* noLepts = new TH1I("noLepts", "N(Lepton)", 10, 0, 10);
  TH1F* ptMuons = new TH1F("ptMuons", "pt_{Muons}", 100, 0., 300.);
  TH1F* enMuons = new TH1F("enMuons", "energy_{Muons}", 100, 0., 300.);
  TH1F* etaMuons = new TH1F("etaMuons", "eta_{Muons}", 100, -3., 3.);
  TH1F* phiMuons = new TH1F("phiMuons", "phi_{Muons}", 100, -5., 5.);

  // -------------------------------------------------
  std::cout << "open  file: " << argv[1] << std::endl;
  // -------------------------------------------------
  TFile* inFile = TFile::Open(argv[1]);
  TTree* events_ = nullptr;
  if (inFile)
    inFile->GetObject("Events", events_);
  if (events_ == nullptr) {
    // -------------------------------------------------
    std::cerr << "ERROR:: "
              << "Unable to retrieve TTree Events!" << std::endl
              << "        Eighter wrong file name or the the tree doesn't exists" << std::endl;
    // -------------------------------------------------
    return -1;
  }

  // acess branch of muons and elecs
  char muonName[50];
  sprintf(muonName, "patMuons_selectedPatMuons__%s.obj", argv[2]);
  TBranch* muons_ = events_->GetBranch(muonName);
  assert(muons_ != nullptr);
  char elecName[50];
  sprintf(elecName, "patElectrons_selectedPatElectrons__%s.obj", argv[2]);
  TBranch* elecs_ = events_->GetBranch(elecName);
  assert(elecs_ != nullptr);

  // loop over events and fill histograms
  std::vector<pat::Muon> muons;
  std::vector<pat::Electron> elecs;
  int nevt = events_->GetEntries();

  // -------------------------------------------------
  std::cout << "start looping " << nevt << " events..." << std::endl;
  // -------------------------------------------------
  for (int evt = 0; evt < nevt; ++evt) {
    // set branch address
    muons_->SetAddress(&muons);
    elecs_->SetAddress(&elecs);
    // get event
    muons_->GetEntry(evt);
    elecs_->GetEntry(evt);
    events_->GetEntry(evt, 0);

    // -------------------------------------------------
    if (evt > 0 && !(evt % 10))
      std::cout << "  processing event: " << evt << std::endl;
    // -------------------------------------------------

    // fill histograms
    noMuons->Fill(muons.size());
    noLepts->Fill(muons.size() + elecs.size());
    for (unsigned idx = 0; idx < muons.size(); ++idx) {
      // fill histograms
      ptMuons->Fill(muons[idx].pt());
      enMuons->Fill(muons[idx].energy());
      etaMuons->Fill(muons[idx].eta());
      phiMuons->Fill(muons[idx].phi());
    }
  }
  // -------------------------------------------------
  std::cout << "close file" << std::endl;
  // -------------------------------------------------
  inFile->Close();

  // save histograms to file
  TFile outFile("analyzeMuons.root", "recreate");
  outFile.mkdir("analyzeMuon");
  outFile.cd("analyzeMuon");
  noMuons->Write();
  noLepts->Write();
  ptMuons->Write();
  enMuons->Write();
  etaMuons->Write();
  phiMuons->Write();
  outFile.Close();

  // free allocated space
  delete noMuons;
  delete noLepts;
  delete ptMuons;
  delete enMuons;
  delete etaMuons;
  delete phiMuons;

  return 0;
}