/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/DQM/DataScouting/src/RazorVarProducer.cc

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#include "FWCore/ParameterSet/interface/ParameterSet.h"

#include "DataFormats/Common/interface/Handle.h"

#include "DataFormats/JetReco/interface/CaloJet.h"
#include "DataFormats/JetReco/interface/CaloJetCollection.h"

#include "DataFormats/METReco/interface/CaloMET.h"
#include "DataFormats/METReco/interface/CaloMETCollection.h"

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

#include "FWCore/Utilities/interface/InputTag.h"

#include "DQM/DataScouting/interface/RazorVarProducer.h"

#include "TVector3.h"

#include <memory>
#include <vector>

//
// constructors and destructor
//
RazorVarProducer::RazorVarProducer(const edm::ParameterSet& iConfig) :
  inputTag_    (iConfig.getParameter<edm::InputTag>("inputTag")),
  inputMetTag_ (iConfig.getParameter<edm::InputTag>("inputMetTag")){

  produces<std::vector<double> >();

  LogDebug("") << "Inputs: "
               << inputTag_.encode() << " "
               << inputMetTag_.encode() << ".";
}

RazorVarProducer::~RazorVarProducer()
{
}

// ------------ method called to produce the data  ------------ 
void
RazorVarProducer::produce(edm::Event& iEvent, const edm::EventSetup& iSetup)
{
   using namespace std;
   using namespace edm;
   using namespace reco;


   // get hold of collection of objects
   Handle< vector<math::XYZTLorentzVector> > hemispheres;
   iEvent.getByLabel (inputTag_,hemispheres);

   // get hold of the MET Collection
   Handle<CaloMETCollection> inputMet;
   iEvent.getByLabel(inputMetTag_,inputMet);  

   std::auto_ptr<std::vector<double> > result(new std::vector<double>); 
   // check the the input collections are available
   if (hemispheres.isValid() && inputMet.isValid() && hemispheres->size() > 1){

     TLorentzVector ja(hemispheres->at(0).x(),hemispheres->at(0).y(),hemispheres->at(0).z(),hemispheres->at(0).t());
     TLorentzVector jb(hemispheres->at(1).x(),hemispheres->at(1).y(),hemispheres->at(1).z(),hemispheres->at(1).t());

     std::vector<math::XYZTLorentzVector> muonVec;
     const double MR = CalcMR(ja,jb);
     const double R  = CalcR(MR,ja,jb,inputMet,muonVec);
     result->push_back(MR);
     result->push_back(R);
     
   }
   iEvent.put(result);
}

double 
RazorVarProducer::CalcMR(TLorentzVector ja, TLorentzVector jb){
  if(ja.Pt()<=0.1) return -1;

  ja.SetPtEtaPhiM(ja.Pt(),ja.Eta(),ja.Phi(),0.0);
  jb.SetPtEtaPhiM(jb.Pt(),jb.Eta(),jb.Phi(),0.0);
  
  if(ja.Pt() > jb.Pt()){
    TLorentzVector temp = ja;
    ja = jb;
    jb = temp;
  }
  
  double A = ja.P();
  double B = jb.P();
  double az = ja.Pz();
  double bz = jb.Pz();
  TVector3 jaT, jbT;
  jaT.SetXYZ(ja.Px(),ja.Py(),0.0);
  jbT.SetXYZ(jb.Px(),jb.Py(),0.0);
  double ATBT = (jaT+jbT).Mag2();
  
  double MR = sqrt((A+B)*(A+B)-(az+bz)*(az+bz)-
                   (jbT.Dot(jbT)-jaT.Dot(jaT))*(jbT.Dot(jbT)-jaT.Dot(jaT))/(jaT+jbT).Mag2());
  
  double mybeta = (jbT.Dot(jbT)-jaT.Dot(jaT))/
    sqrt(ATBT*((A+B)*(A+B)-(az+bz)*(az+bz)));
  
  double mygamma = 1./sqrt(1.-mybeta*mybeta);
  
  //use gamma times MRstar
  return MR*mygamma;  
}

double 
RazorVarProducer::CalcR(double MR, TLorentzVector ja, TLorentzVector jb, edm::Handle<reco::CaloMETCollection> inputMet, std::vector<math::XYZTLorentzVector> muons){
  //now we can calculate MTR
  TVector3 met;
  met.SetPtEtaPhi((inputMet->front()).pt(),0.0,(inputMet->front()).phi());
  
  std::vector<math::XYZTLorentzVector>::const_iterator muonIt;
  for(muonIt = muons.begin(); muonIt!=muons.end(); muonIt++){
    TVector3 tmp;
    tmp.SetPtEtaPhi(muonIt->pt(),0,muonIt->phi());
    met-=tmp;
  }

  double MTR = sqrt(0.5*(met.Mag()*(ja.Pt()+jb.Pt()) - met.Dot(ja.Vect()+jb.Vect())));
  
  //filter events
  return float(MTR)/float(MR); //R
  
}

DEFINE_FWK_MODULE(RazorVarProducer);