/data/refman/pasoursint/CMSSW_5_2_9/src/HLTrigger/btau/src/HLTDisplacedmumumuVtxProducer.cc

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#include <iostream>

#include "FWCore/Framework/interface/ESHandle.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"

#include "DataFormats/Candidate/interface/CandidateFwd.h"
#include "DataFormats/RecoCandidate/interface/RecoCandidate.h"
#include "DataFormats/RecoCandidate/interface/RecoChargedCandidate.h"
#include "DataFormats/RecoCandidate/interface/RecoChargedCandidateFwd.h"
#include "DataFormats/Candidate/interface/Candidate.h"
#include "DataFormats/HLTReco/interface/TriggerFilterObjectWithRefs.h"
#include "DataFormats/HLTReco/interface/TriggerRefsCollections.h"

#include "DataFormats/TrackReco/interface/TrackFwd.h"
#include "DataFormats/TrackReco/interface/Track.h"
#include "TrackingTools/TransientTrack/interface/TransientTrackBuilder.h"
#include "TrackingTools/Records/interface/TransientTrackRecord.h"

#include "RecoVertex/KalmanVertexFit/interface/KalmanVertexFitter.h"
#include "RecoVertex/VertexPrimitives/interface/TransientVertex.h"
#include "DataFormats/VertexReco/interface/Vertex.h"
#include "DataFormats/VertexReco/interface/VertexFwd.h"
#include "DataFormats/Common/interface/RefToBase.h"


#include "HLTDisplacedmumumuVtxProducer.h"

using namespace edm;
using namespace reco;
using namespace std; 
using namespace trigger;
//
// constructors and destructor
//
HLTDisplacedmumumuVtxProducer::HLTDisplacedmumumuVtxProducer(const edm::ParameterSet& iConfig): 
  src_ (iConfig.getParameter<edm::InputTag>("Src")),
  previousCandTag_(iConfig.getParameter<edm::InputTag>("PreviousCandTag")),
  maxEta_ (iConfig.getParameter<double>("MaxEta")),
  minPt_ (iConfig.getParameter<double>("MinPt")),
  minPtTriplet_ (iConfig.getParameter<double>("MinPtTriplet")),
  minInvMass_ (iConfig.getParameter<double>("MinInvMass")),
  maxInvMass_ (iConfig.getParameter<double>("MaxInvMass")),
  chargeOpt_ (iConfig.getParameter<int>("ChargeOpt"))
{
  produces<VertexCollection>();
}


HLTDisplacedmumumuVtxProducer::~HLTDisplacedmumumuVtxProducer()
{
  
}


// ------------ method called once each job just before starting event loop  ------------
void HLTDisplacedmumumuVtxProducer::beginJob()
{
  
}

// ------------ method called once each job just after ending the event loop  ------------
void HLTDisplacedmumumuVtxProducer::endJob() 
{
  
}

// ------------ method called on each new Event  ------------
void HLTDisplacedmumumuVtxProducer::produce(edm::Event& iEvent, const edm::EventSetup& iSetup)
{
  double const MuMass = 0.106;
  double const MuMass2 = MuMass*MuMass;
  
  
  // get hold of muon trks
  Handle<RecoChargedCandidateCollection> mucands;
  iEvent.getByLabel (src_,mucands);
  
  //get the transient track builder:
  edm::ESHandle<TransientTrackBuilder> theB;
  iSetup.get<TransientTrackRecord>().get("TransientTrackBuilder",theB);
  
  std::auto_ptr<VertexCollection> vertexCollection(new VertexCollection());
  
  // look at all mucands,  check cuts and make vertices
  double e1,e2,e3;
  Particle::LorentzVector p,p1,p2,p3;
  
  RecoChargedCandidateCollection::const_iterator cand1;
  RecoChargedCandidateCollection::const_iterator cand2;
  RecoChargedCandidateCollection::const_iterator cand3;
  
  // get the objects passing the previous filter
  Handle<TriggerFilterObjectWithRefs> previousCands;
  iEvent.getByLabel (previousCandTag_,previousCands);
  
  vector<RecoChargedCandidateRef> vPrevCands;
  previousCands->getObjects(TriggerMuon,vPrevCands);
  
  for (cand1=mucands->begin(); cand1!=mucands->end(); cand1++) {
    TrackRef tk1 = cand1->get<TrackRef>();
    LogDebug("HLTDisplacedMumumuFilter") << " 1st muon in loop: q*pt= " << cand1->charge()*cand1->pt() << ", eta= " << cand1->eta() << ", hits= " << tk1->numberOfValidHits();
    
    //first check if this muon passed the previous filter
    if( ! checkPreviousCand( tk1, vPrevCands) ) continue;
    
    // cuts
    if (fabs(cand1->eta())>maxEta_) continue;
    if (cand1->pt() < minPt_) continue;
    
    cand2 = cand1; cand2++;
    for (; cand2!=mucands->end(); cand2++) {
      TrackRef tk2 = cand2->get<TrackRef>();
      
      // eta cut
      LogDebug("HLTMuonDimuonFilter") << " 2nd muon in loop: q*pt= " << cand2->charge()*cand2->pt() << ", eta= " << cand2->eta() << ", hits= " << tk2->numberOfValidHits() << ", d0= " << tk2->d0();
      //first check if this muon passed the previous filter
      if( ! checkPreviousCand( tk2, vPrevCands) ) continue;
      
      // cuts
      if (fabs(cand2->eta())>maxEta_) continue;
      if (cand2->pt() < minPt_) continue;
      
      cand3 = cand2; cand3++;
      for (; cand3!=mucands->end(); cand3++) {
        TrackRef tk3 = cand3->get<TrackRef>();
        
        // eta cut
        LogDebug("HLTMuonDimuonFilter") << " 3rd muon in loop: q*pt= " << cand3->charge()*cand3->pt() << ", eta= " << cand3->eta() << ", hits= " << tk3->numberOfValidHits() << ", d0= " << tk3->d0();
        //first check if this muon passed the previous filter
        if( ! checkPreviousCand( tk3, vPrevCands) ) continue;
        
        // cuts
        if (fabs(cand3->eta())>maxEta_) continue;
        if (cand3->pt() < minPt_) continue;
        
        // opposite sign or same sign
        if (chargeOpt_>0) {
          if (fabs (cand1->charge() + cand2->charge() + cand3->charge()) != chargeOpt_) continue;
        }
        
        // Combined dimuon system
        e1 = sqrt(cand1->momentum().Mag2()+MuMass2);
        e2 = sqrt(cand2->momentum().Mag2()+MuMass2);
        e3 = sqrt(cand3->momentum().Mag2()+MuMass2);
        p1 = Particle::LorentzVector(cand1->px(),cand1->py(),cand1->pz(),e1);
        p2 = Particle::LorentzVector(cand2->px(),cand2->py(),cand2->pz(),e2);
        p3 = Particle::LorentzVector(cand3->px(),cand3->py(),cand3->pz(),e3);
        p = p1+p2+p3;
        
        
        if (p.pt()<minPtTriplet_) continue;
        
        double invmass = abs(p.mass());
        LogDebug("HLTDisplacedMumumuFilter") << " ... 1-2 invmass= " << invmass;
        
        if (invmass<minInvMass_) continue;
        if (invmass>maxInvMass_) continue;
        
        // do the vertex fit
        vector<TransientTrack> t_tks;
        TransientTrack ttkp1 = (*theB).build(&tk1);
        TransientTrack ttkp2 = (*theB).build(&tk2);
        TransientTrack ttkp3 = (*theB).build(&tk3);
        t_tks.push_back(ttkp1);
        t_tks.push_back(ttkp2);
        t_tks.push_back(ttkp3);
        
        
        if (t_tks.size()!=3) continue;
        
        KalmanVertexFitter kvf;
        TransientVertex tv = kvf.vertex(t_tks);
        
        if (!tv.isValid()) continue;
        
        Vertex vertex = tv;
        
        // put vertex in the event
        vertexCollection->push_back(vertex);
      }
    }
  }
  iEvent.put(vertexCollection);
}



bool HLTDisplacedmumumuVtxProducer::checkPreviousCand(const TrackRef& trackref, vector<RecoChargedCandidateRef> & refVect){
  bool ok=false;
  for (unsigned int i=0; i<refVect.size(); i++) {
    if ( refVect[i]->get<TrackRef>() == trackref ) {
      ok=true;
      break;
    }
  }
  return ok;
}