/data/doxygen/doxygen-1.7.3/gen/CMSSW_4_2_8/src/GeneratorInterface/GenFilters/src/PythiaFilterGammaJetWithBg.cc

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#include "GeneratorInterface/GenFilters/interface/PythiaFilterGammaJetWithBg.h"
#include "SimDataFormats/GeneratorProducts/interface/HepMCProduct.h"
#include "SimGeneral/HepPDTRecord/interface/ParticleDataTable.h"
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/ESHandle.h"
#include <iostream>
#include<list>
#include<vector>
#include<cmath>

//using namespace edm;
//using namespace std;

namespace{

  double deltaR2(double eta0, double phi0, double eta, double phi){
    double dphi=phi-phi0;
    if(dphi>M_PI) dphi-=2*M_PI;
    else if(dphi<=-M_PI) dphi+=2*M_PI;
    return dphi*dphi+(eta-eta0)*(eta-eta0);
  }

  double deltaPhi(double phi0, double phi){
    double dphi=phi-phi0;
    if(dphi>M_PI) dphi-=2*M_PI;
    else if(dphi<=-M_PI) dphi+=2*M_PI;
    return dphi;
  }

  class ParticlePtGreater{
  public:
    int operator()(const HepMC::GenParticle * p1, 
                   const HepMC::GenParticle * p2) const{
      return p1->momentum().perp() > p2->momentum().perp();
    }
  };
}


PythiaFilterGammaJetWithBg::PythiaFilterGammaJetWithBg(const edm::ParameterSet& iConfig) :
label_(iConfig.getUntrackedParameter("moduleLabel",std::string("generator"))),
etaMax(iConfig.getUntrackedParameter<double>("MaxPhotonEta", 2.8)),
ptSeed(iConfig.getUntrackedParameter<double>("PhotonSeedPt", 5.)),
ptMin(iConfig.getUntrackedParameter<double>("MinPhotonPt")),
ptMax(iConfig.getUntrackedParameter<double>("MaxPhotonPt")),
dphiMin(iConfig.getUntrackedParameter<double>("MinDeltaPhi", -1)/180*M_PI),
detaMax(iConfig.getUntrackedParameter<double>("MaxDeltaEta", 10.)),
etaPhotonCut2(iConfig.getUntrackedParameter<double>("MinPhotonEtaForwardJet", 1.3)),
cone(0.5),ebEtaMax(1.479),
maxnumberofeventsinrun(iConfig.getUntrackedParameter<int>("MaxEvents",10)){ 
  
  deltaEB=0.01745/2  *5; // delta_eta, delta_phi
  deltaEE=2.93/317/2 *5; // delta_x/z, delta_y/z
  theNumberOfSelected = 0;
}


PythiaFilterGammaJetWithBg::~PythiaFilterGammaJetWithBg(){}


// ------------ method called to produce the data  ------------
bool PythiaFilterGammaJetWithBg::filter(edm::Event& iEvent, const edm::EventSetup& iSetup){

// <<<<<<< PythiaFilterGammaJetWithBg.cc
//  if(theNumberOfSelected>=maxnumberofeventsinrun)   {
//    throw cms::Exception("endJob")<<"we have reached the maximum number of events ";
//  }
// =======
// >>>>>>> 1.4

  bool accepted = false;
  edm::Handle<edm::HepMCProduct> evt;
  iEvent.getByLabel(label_, evt);

  std::list<const HepMC::GenParticle *> seeds;
  const HepMC::GenEvent * myGenEvent = evt->GetEvent();

  for ( HepMC::GenEvent::particle_const_iterator p = myGenEvent->particles_begin();   p != myGenEvent->particles_end(); ++p ) {
   
    if ( (*p)->pdg_id()==22 && (*p)->status()==1
         && (*p)->momentum().perp() > ptSeed 
         && std::abs((*p)->momentum().eta()) < etaMax  ) seeds.push_back(*p);

  }

  seeds.sort(ParticlePtGreater());
  
//  std::cout<<" Number of seeds "<<seeds.size()<<" ProccessID "<<myGenEvent->signal_process_id()<<std::endl;
//  std::cout<<" ParticleId 7= "<<myGenEvent->particle(7)->pdg_id()
//  <<" pT "<<myGenEvent->particle(7)->momentum().perp()
//  <<" Eta "<<myGenEvent->particle(7)->momentum().eta()
//  <<" Phi "<<myGenEvent->particle(7)->momentum().phi()<<std::endl;
//  std::cout<<" ParticleId 8= "<<myGenEvent->particle(8)->pdg_id()<<" pT "<<myGenEvent->particle(8)->momentum().perp()<<" Eta "<<myGenEvent->particle(8)->momentum().eta()<<" Phi "<<myGenEvent->particle(8)->momentum().phi()<<std::endl;

  for(std::list<const HepMC::GenParticle *>::const_iterator is=
        seeds.begin(); is!=seeds.end(); is++){
 
    double etaPhoton=(*is)->momentum().eta();
    double phiPhoton=(*is)->momentum().phi();

    /*
    double dphi7=std::abs(deltaPhi(phiPhoton, 
                               myGenEvent->particle(7)->momentum().phi()));
    double dphi=std::abs(deltaPhi(phiPhoton, 
                              myGenEvent->particle(8)->momentum().phi()));
    */

    //***
    HepMC::GenEvent::particle_const_iterator ppp = myGenEvent->particles_begin();
    for(int i=0;i<6;++i) ppp++;
    HepMC::GenParticle* particle7 = (*ppp);
    ppp++;
    HepMC::GenParticle* particle8 = (*ppp);

    double dphi7=std::abs(deltaPhi(phiPhoton, 
                                   particle7->momentum().phi()));
    double dphi=std::abs(deltaPhi(phiPhoton, 
                                  particle8->momentum().phi()));
    //***

    int jetline=8;
    int photonline = 7; 
    if(dphi7>dphi) {
      dphi=dphi7;
      jetline=7;
      photonline = 8; 
    }
    
//    std::cout<<" Dphi "<<dphi<<" "<<dphiMin<<std::endl;
//    if(dphi<dphiMin) {
//      std::cout<<"Reject dphi"<<std::endl;
//      continue;
//    }
    
    //double etaJet= myGenEvent->particle(jetline)->momentum().eta();
    //***
    double etaJet = 0.0;
    if(jetline==8) etaJet = particle8->momentum().eta();
    else etaJet = particle7->momentum().eta();
    //***

    double eta1=etaJet-detaMax;
    double eta2=etaJet+detaMax;
    if (eta1>etaPhotonCut2) eta1=etaPhotonCut2;
    if (eta2<-etaPhotonCut2) eta2=-etaPhotonCut2;
//    std::cout<<" Etaphoton "<<etaPhoton<<" "<<eta1<<" "<<eta2<<std::endl;
    if (etaPhoton<eta1 ||etaPhoton>eta2) {
//       std::cout<<"Reject eta"<<std::endl;
       continue;
    }
    bool inEB(0);
    double tgx(0);
    double tgy(0);
    if( std::abs(etaPhoton)<ebEtaMax) inEB=1;
    else{
      tgx=(*is)->momentum().px()/(*is)->momentum().pz();
      tgy=(*is)->momentum().py()/(*is)->momentum().pz();
    }

    double etPhoton=0;
    double etPhotonCharged=0;
    double etCone=0;
    double etConeCharged=0;
    double ptMaxHadron=0;
    
    
    for ( HepMC::GenEvent::particle_const_iterator p = myGenEvent->particles_begin();   p != myGenEvent->particles_end(); ++p ) {
    
      if ( (*p)->status()!=1 ) continue; 
      int pid= (*p)->pdg_id();
      int apid= std::abs(pid);
      if (apid>11 &&  apid<21) continue; //get rid of muons and neutrinos
      double eta=(*p)->momentum().eta();
      double phi=(*p)->momentum().phi();
      if (deltaR2(etaPhoton, phiPhoton, eta, phi)>cone*cone) continue;
      double pt=(*p)->momentum().perp();
      
      //***
      edm::ESHandle<ParticleDataTable> pdt;
      iSetup.getData( pdt );
      
      
      // double charge=(*p)->particledata().charge();
      // int charge3=(*p)->particleID().threeCharge();
      
      int charge3 = ((pdt->particle((*p)->pdg_id()))->ID().threeCharge());
      //***

      etCone+=pt;
      if(charge3 && pt<2) etConeCharged+=pt;

      //select particles matching a crystal array centered on photon
      if(inEB) {
        if(  std::abs(eta-etaPhoton)> deltaEB ||
             std::abs(deltaPhi(phi,phiPhoton)) > deltaEB) continue;
      }
      else if( std::abs((*p)->momentum().px()/(*p)->momentum().pz() - tgx)
               > deltaEE || 
               std::abs((*p)->momentum().py()/(*p)->momentum().pz() - tgy)
               > deltaEE) continue;

      etPhoton+=pt;
      if(charge3 && pt<2) etPhotonCharged+=pt;
      if(apid>100 && apid!=310 && pt>ptMaxHadron) ptMaxHadron=pt;

    }
//    std::cout<<" etPhoton "<<etPhoton<<" "<<ptMin<<" "<<ptMax<<std::endl;
    
    if(etPhoton<ptMin ||etPhoton>ptMax) {
//     std::cout<<" Reject etPhoton "<<std::endl;
     continue;
    }
    //isolation cuts

    double isocut1 = 5+etPhoton/20-etPhoton*etPhoton/1e4;
    double isocut2 = 3+etPhoton/20-etPhoton*etPhoton*etPhoton/1e6;
    double isocut3 = 4.5+etPhoton/40;
    if (etPhoton>165.)
    {
      isocut1 = 5.+165./20.-165.*165./1e4;
      isocut2 = 3.+165./20.-165.*165.*165./1e6;
      isocut3 = 4.5+165./40.;
    }

//    std::cout<<" etCone "<<etCone<<" "<<etPhoton<<" "<<etCone-etPhoton<<" "<<isocut1<<std::endl;
//    std::cout<<"Second cut on iso "<<etCone-etPhoton-(etConeCharged-etPhotonCharged)<<" cut value "<<isocut2<<" etPhoton "<<etPhoton<<std::endl;
//    std::cout<<" PtHadron "<<ptMaxHadron<<" "<<4.5+etPhoton/40<<std::endl;
    
    if(etCone-etPhoton> 5+etPhoton/20-etPhoton*etPhoton/1e4) continue;
//    std::cout<<" Accept 1"<<std::endl;
    if(etCone-etPhoton-(etConeCharged-etPhotonCharged) > 
       isocut2) continue;
//     std::cout<<" Accept 2"<<std::endl;
    if(ptMaxHadron > isocut3) continue;
    
//    std::cout<<"Accept event "<<std::endl;
    accepted=true;
    break;

  } //loop over seeds
  
  
  if (accepted) {
    theNumberOfSelected++;
    std::cout<<" Event preselected "<<theNumberOfSelected<<" Proccess ID "<<myGenEvent->signal_process_id()<<std::endl;
    return true; 
  }
  else return false;

}