/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/ElectroWeakAnalysis/ZMuMu/plugins/MuTriggerAnalyzer.cc

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#include "FWCore/Framework/interface/EDAnalyzer.h"
#include "FWCore/Utilities/interface/InputTag.h"
#include "FWCore/Framework/interface/Event.h"
#include "DataFormats/Common/interface/Handle.h"
#include "FWCore/Framework/interface/MakerMacros.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "DataFormats/Candidate/interface/Candidate.h"
#include "FWCore/Common/interface/TriggerNames.h"
#include "DataFormats/Common/interface/TriggerResults.h"
#include "DataFormats/HLTReco/interface/TriggerObject.h"
#include "DataFormats/HLTReco/interface/TriggerEvent.h"
#include "DataFormats/Math/interface/deltaR.h"
#include "DataFormats/MuonReco/interface/Muon.h"
#include "FWCore/ServiceRegistry/interface/Service.h"
#include "CommonTools/UtilAlgos/interface/TFileService.h"
#include "PhysicsTools/RooStatsCms/interface/ClopperPearsonBinomialInterval.h"
#include "TGraphAsymmErrors.h" 
#include "TH1.h"
#include <numeric>
#include <algorithm>
#include <string>
using namespace std;
using namespace reco;
using namespace edm;

/*
bool IsMuMatchedToHLTMu ( const reco::Candidate * dau, std::vector<reco::Particle> HLTMu , double DR, double DPtRel ) {
  unsigned int dim =  HLTMu.size();
  unsigned int nPass=0;
  if (dim==0) return false;
  for (unsigned int k =0; k< dim; k++ ) {
   if (  (deltaR(HLTMu[k], *dau) < DR)   && (fabs(HLTMu[k].pt() - dau->pt())/ HLTMu[k].pt()<DPtRel)){     nPass++ ;
    }
  }
  return (nPass>0);
}

bool IsMuMatchedToHLTSingleMu ( const reco::Candidate * dau, reco::Particle HLTMu , double DR, double DPtRel ) {
  unsigned int nPass=0;
  if (  (deltaR(HLTMu, *dau) < DR)   && (fabs(HLTMu.pt() - dau->pt())/ HLTMu.pt()<DPtRel)) {
    nPass++;
  }
  return (nPass>0);
}

*/


class MuTriggerAnalyzer : public edm::EDAnalyzer {
public:
  MuTriggerAnalyzer(const edm::ParameterSet& pset );

private:
  virtual void analyze(const edm::Event& event, const edm::EventSetup& setup);
  virtual void endJob();
  bool IsMuMatchedToHLTMu ( const reco::Muon & , std::vector<reco::Particle> ,double ,double );
  
  edm::InputTag trigTag_;   
  edm::InputTag  trigEv_;
  edm::InputTag muonTag_;
  double ptMuCut_, etaMuCut_;
  std::string hltPath_;
  std::string L3FilterName_;
  edm::Handle<edm::TriggerResults> triggerResults_;
  edm::TriggerNames const* trigNames_;
  edm::Handle< trigger::TriggerEvent > handleTriggerEvent_;

  double maxDPtRel_, maxDeltaR_ ;
  const int nbins_;
  const double ptMax_;
  TH1D * hTrigMuonPtNumS_;
  TH1D * hTrigMuonPtDenS_;
  TH1D * deltaR_;
  TH1D * deltaPtOverPt_;


}; 

bool MuTriggerAnalyzer::IsMuMatchedToHLTMu ( const reco::Muon & mu, std::vector<reco::Particle> HLTMu , double DR, double DPtRel ) {
  size_t dim =  HLTMu.size();
  size_t nPass=0;
  
  // filling the denumerator;
  double muRecoPt= mu.pt();
  hTrigMuonPtDenS_-> Fill(muRecoPt);         
 
  if (dim==0) return false;
  for (size_t k =0; k< dim; k++ ) {
    if (  (deltaR(HLTMu[k], mu) < DR)   && (fabs(HLTMu[k].pt() - mu.pt())/ HLTMu[k].pt()<DPtRel)){     
      nPass++ ;
      std::cout<< " matching a muon " << std::endl;  
      std::cout  << "muon reco  pt : " << muRecoPt<< std::endl;     
      std::cout  << "muon reco  eta " <<  mu.eta() << std::endl;   
      std::cout << "muon trigger  pt "<< HLTMu[k].pt() << std::endl; 
      // filling the numerator, at the same bin as the denum..... 
      hTrigMuonPtNumS_-> Fill(muRecoPt);
      deltaR_-> Fill(deltaR(HLTMu[k], mu));
      deltaPtOverPt_-> Fill(fabs(HLTMu[k].pt() - mu.pt())/ HLTMu[k].pt());

         
      std::cout << "muon trigger  eta : "<< HLTMu[k].eta() << std::endl;   
      std::cout  <<"deltaR((HLTMu[k], mu)): "<< deltaR(HLTMu[k], mu) << std::endl;
      std::cout  <<"deltaPtOverPt: "<< fabs(HLTMu[k].pt() - mu.pt())/ HLTMu[k].pt() << std::endl;
    }
  }
  
  return (nPass>0);
}



MuTriggerAnalyzer::MuTriggerAnalyzer(const edm::ParameterSet& cfg ) :
  trigTag_(cfg.getParameter<edm::InputTag> ("TrigTag")),
  trigEv_(cfg.getParameter<edm::InputTag> ("triggerEvent")),
  muonTag_(cfg.getUntrackedParameter<edm::InputTag>("muons")),
  ptMuCut_(cfg.getUntrackedParameter<double>("ptMuCut")),
  etaMuCut_(cfg.getUntrackedParameter<double>("etaMuCut")),
  hltPath_(cfg.getParameter<std::string >("hltPath")),
  L3FilterName_(cfg.getParameter<std::string >("L3FilterName")),
  maxDPtRel_(cfg.getParameter<double>("maxDPtRel")),
  maxDeltaR_(cfg.getParameter<double>("maxDeltaR")),
  nbins_(cfg.getParameter<double>("ptMax_")), 
  ptMax_(cfg.getParameter<double>("ptMax_")){
   Service<TFileService> fs;
 
 hTrigMuonPtNumS_ = fs->make<TH1D>("hTrigMuonPtNumS", "hTrigMuonPtNumS", nbins_ + 1, 0, ptMax_); 
  hTrigMuonPtDenS_ = fs->make<TH1D>("hTrigMuonPtDenS", "hTrigMuonPtDenS", nbins_ +1 , 0, ptMax_); 
  deltaR_ = fs->make<TH1D>("deltaR", "deltaR", nbins_+1, 0, maxDeltaR_); 
  deltaPtOverPt_ = fs->make<TH1D>("deltaPtOverPt", "deltaPtOverPt", nbins_ + 1, 0, maxDPtRel_); 

}

void MuTriggerAnalyzer::endJob() {
  for (int i = 0; i < nbins_+1; ++i){
    std::cout << "number of reco muon in bin " << i << " = " << hTrigMuonPtDenS_->GetBinContent(i) << std::endl;
    std::cout << "number of hlt muon in bin " << i << " = " << hTrigMuonPtNumS_->GetBinContent(i) << std::endl;

 
  }
}

void MuTriggerAnalyzer::analyze (const Event & ev, const EventSetup &) {
          //      bool overlap = false;
  
      // Trigger
      Handle<TriggerResults> triggerResults;
      TriggerNames trigNames;
      if (!ev.getByLabel(trigTag_, triggerResults)) {
        LogWarning("") << ">>> TRIGGER collection does not exist !!!";
        return;
      }
      ev.getByLabel(trigTag_, triggerResults); 
      // trigNames.init(*triggerResults);
      trigNames_ = &ev.triggerNames(*triggerResults);
      //bool trigger_fired = false;
      for (unsigned int i=0; i<triggerResults->size(); i++) {
        

        std::string trigName = trigNames_->triggerName(i);
        if ( trigName == hltPath_ && triggerResults->accept(i)) {
          //trigger_fired = true;
        }
      }   
      edm::Handle< trigger::TriggerEvent > handleTriggerEvent;
      //  LogTrace("") << ">>> Trigger bit: " << trigger_fired << " (" << hltPath_ << ")";
          if ( ! ev.getByLabel( trigEv_, handleTriggerEvent ))  {
        LogWarning( "errorTriggerEventValid" ) << "trigger::TriggerEvent product with InputTag " << trigEv_.encode() << " not in event";
        return;
      }
      ev.getByLabel( trigEv_, handleTriggerEvent );
      const trigger::TriggerObjectCollection & toc(handleTriggerEvent->getObjects());
      size_t nMuHLT =0;
      std::vector<reco::Particle>  HLTMuMatched; 
      for ( size_t ia = 0; ia < handleTriggerEvent->sizeFilters(); ++ ia) {
        std::string fullname = handleTriggerEvent->filterTag(ia).encode();
        std::string name;
        size_t p = fullname.find_first_of(':');
        if ( p != std::string::npos) {
          name = fullname.substr(0, p);
        }
        else {
          name = fullname;
        }
        if ( &toc !=0 ) {
          const trigger::Keys & k = handleTriggerEvent->filterKeys(ia);
          for (trigger::Keys::const_iterator ki = k.begin(); ki !=k.end(); ++ki ) {
            if (name == L3FilterName_  ) { 
              HLTMuMatched.push_back(toc[*ki].particle());
              nMuHLT++;     
            }
          }    
        }
      }
      
        //  looping on muon....
      Handle<View<Muon> >   muons;     
      if (!ev.getByLabel(muonTag_, muons)) {           
        LogError("") << ">>> muon collection does not exist !!!";     
        return;     
      }
      
      ev.getByLabel(muonTag_, muons);  
      //saving only muons with pt> ptMuCut and eta<etaMuCut  
      std::vector<reco::Muon>  highPtGlbMuons; 
    
      for (unsigned int i=0; i<muons->size(); i++ ){    
        const reco::Muon & mu = muons->at(i);
        double pt = mu.pt();
        double eta = mu.eta();
        if (pt> ptMuCut_ && fabs(eta)< etaMuCut_) {
          if (mu.isGlobalMuon()) highPtGlbMuons.push_back(mu);    
        }
      }
      unsigned int nHighPtGlbMu = highPtGlbMuons.size();
      std::cout << "I've got " << nHighPtGlbMu << " nHighPtGlbMu" << std::endl;
      // unsigned int nHighPtStaMu = highPtStaMuons.size();

        // stop the loop after 10 cicles....  
        (nHighPtGlbMu> 10)?   nHighPtGlbMu=10 : 1; 

        if (nHighPtGlbMu>0 ){
          
           for(unsigned int i =0 ; i < nHighPtGlbMu ; i++) {
            reco::Muon muon1 = highPtGlbMuons[i];
            math::XYZTLorentzVector mu1(muon1.p4());
            //      double pt1= muon1.pt();
        
            /* bool singleTrigFlag1 =*/ IsMuMatchedToHLTMu ( muon1,  HLTMuMatched ,maxDeltaR_, maxDPtRel_ );
            
          }
          
        }      
      
}


#include "FWCore/Framework/interface/MakerMacros.h"

DEFINE_FWK_MODULE( MuTriggerAnalyzer );