#include <MultiParticleInConeGunProducer.h>

Inheritance diagram for edm::MultiParticleInConeGunProducer:

Public Member Functions
	MultiParticleInConeGunProducer (const ParameterSet &)
virtual	~MultiParticleInConeGunProducer ()
Protected Attributes
std::vector< int >	fInConeIds
double	fInConeMaxEta
double	fInConeMaxPhi
unsigned int	fInConeMaxTry
double	fInConeMinEta
double	fInConeMinPhi
double	fMaxDeltaR
double	fMaxMomRatio
double	fMaxPt
double	fMinDeltaR
double	fMinMomRatio
double	fMinPt
Private Member Functions
virtual void	produce (Event &e, const EventSetup &es)

Detailed Description

Definition at line 15 of file MultiParticleInConeGunProducer.h.

Constructor & Destructor Documentation

MultiParticleInConeGunProducer::MultiParticleInConeGunProducer ( const ParameterSet & pset )

Definition at line 24 of file MultiParticleInConeGunProducer.cc.

References fInConeIds, fInConeMaxEta, fInConeMaxPhi, fInConeMaxTry, fInConeMinEta, fInConeMinPhi, fMaxDeltaR, fMaxMomRatio, fMaxPt, fMinDeltaR, fMinMomRatio, fMinPt, and edm::ParameterSet::getParameter().

                                                                                       : 
   BaseFlatGunProducer(pset)
{


   ParameterSet defpset ;
   ParameterSet pgun_params = 
      pset.getParameter<ParameterSet>("PGunParameters") ;
  
   fMinPt = pgun_params.getParameter<double>("MinPt");
   fMaxPt = pgun_params.getParameter<double>("MaxPt");

   fInConeIds = pgun_params.getParameter< vector<int> >("InConeID");
   fMinDeltaR = pgun_params.getParameter<double>("MinDeltaR");
   fMaxDeltaR = pgun_params.getParameter<double>("MaxDeltaR");
   fMinMomRatio = pgun_params.getParameter<double>("MinMomRatio");
   fMaxMomRatio = pgun_params.getParameter<double>("MaxMomRatio");

   fInConeMinEta = pgun_params.getParameter<double>("InConeMinEta");
   fInConeMaxEta = pgun_params.getParameter<double>("InConeMaxEta");
   fInConeMinPhi = pgun_params.getParameter<double>("InConeMinPhi");
   fInConeMaxPhi = pgun_params.getParameter<double>("InConeMaxPhi");
   fInConeMaxTry = pgun_params.getParameter<unsigned int>("InConeMaxTry");
   
   produces<HepMCProduct>();
   produces<GenEventInfoProduct>();
}

MultiParticleInConeGunProducer::~MultiParticleInConeGunProducer ( ) [virtual]

Definition at line 52 of file MultiParticleInConeGunProducer.cc.

{
   // no need to cleanup GenEvent memory - done in HepMCProduct
}

Member Function Documentation

void MultiParticleInConeGunProducer::produce	(	Event &	e,
		const EventSetup &	es
	)		`[private, virtual]`

Implements edm::EDProducer.

Definition at line 57 of file MultiParticleInConeGunProducer.cc.

{

   if ( fVerbosity > 0 )
   {
      cout << " MultiParticleInConeGunProducer : Begin New Event Generation" << endl ; 
   }
   // event loop (well, another step in it...)
          
   // no need to clean up GenEvent memory - done in HepMCProduct
   // 
   
   // here re-create fEvt (memory)
   //
   fEvt = new HepMC::GenEvent() ;
   
   // now actualy, cook up the event from PDGTable and gun parameters
   //
   // 1st, primary vertex
   //
   //HepMC::GenVertex* Vtx = new HepMC::GenVertex(CLHEP::HepLorentzVector(0.,0.,0.));
   HepMC::GenVertex* Vtx = new HepMC::GenVertex(HepMC::FourVector(0.,0.,0.));

   // loop over particles
   //
   int barcode = 1 ;
   for (unsigned int ip=0; ip<fPartIDs.size(); ++ip)
   {

       double pt     = fRandomGenerator->fire(fMinPt, fMaxPt) ;
       double eta    = fRandomGenerator->fire(fMinEta, fMaxEta) ;
       double phi    = fRandomGenerator->fire(fMinPhi, fMaxPhi) ;
       int PartID = fPartIDs[ip] ;
       const HepPDT::ParticleData* 
          PData = fPDGTable->particle(HepPDT::ParticleID(abs(PartID))) ;
       double mass   = PData->mass().value() ;
       double theta  = 2.*atan(exp(-eta)) ;
       double mom    = pt/sin(theta) ;
       double px     = pt*cos(phi) ;
       double py     = pt*sin(phi) ;
       double pz     = mom*cos(theta) ;
       double energy2= mom*mom + mass*mass ;
       double energy = sqrt(energy2) ; 

       HepMC::FourVector p(px,py,pz,energy) ;
       HepMC::GenParticle* Part = 
           new HepMC::GenParticle(p,PartID,1);
       Part->suggest_barcode( barcode ) ;
       barcode++ ;
       Vtx->add_particle_out(Part);

       if ( fAddAntiParticle ){}

       // now add the particles in the cone
       for (unsigned iPic=0; iPic!=fInConeIds.size();iPic++){
         unsigned int nTry=0;
         while(true){
           //shoot flat Deltar
           double dR = fRandomGenerator->fire(fMinDeltaR, fMaxDeltaR);
           //shoot flat eta/phi mixing
           double alpha = fRandomGenerator->fire(-3.14159265358979323846, 3.14159265358979323846);
           double dEta = dR*cos(alpha);
           double dPhi = dR*sin(alpha);
           
           /*
           //shoot Energy of associated particle         
           double energyIc = fRandomGenerator->fire(fMinEInCone, fMaxEInCone);
           if (mom2Ic>0){ momIC = sqrt(mom2Ic);}
           */
           //    get kinematics
           double etaIc = eta+dEta;
           double phiIc = phi+dPhi;
           //put it back in -Pi:Pi if necessary. multiple time might be necessary if dR > 3
           const unsigned int maxL=100;
           unsigned int iL=0;
           while(iL++<maxL){
             if (phiIc > 3.14159265358979323846) phiIc-=2*3.14159265358979323846;
             else if(phiIc <-3.14159265358979323846) phiIc+=2*3.14159265358979323846;
             
             if (abs(phiIc)<3.14159265358979323846) break;
           }
             

           //allow to skip it if you did not run out of possible drawing
           if (nTry++<=fInConeMaxTry){
             //draw another one if this one is not in acceptance
             if (etaIc<fInConeMinEta || etaIc > fInConeMaxEta) continue;
             if (phiIc<fInConeMinPhi || phiIc > fInConeMaxPhi) continue;
           }
           else{
             if ( fVerbosity > 0 )
               {
                 cout << " MultiParticleInConeGunProducer : could not produce a particle "
                      <<  fInConeIds[iPic]<<" in cone "
                      <<  fMinDeltaR<<" to "<<fMaxDeltaR<<" within the "<<fInConeMaxTry<<" allowed tries."<<endl;
               }
             /*      edm::LogError("MultiParticleInConeGunProducer")<< " MultiParticleInConeGunProducer : could not produce a particle "<<
               fInConeIds[iPic]<<" in cone "<<
               fMinDeltaR<<" to "<<fMaxDeltaR<<" within the "<<fInConeMaxTry<<" allowed tries.";*/
           }
           int PartIDIc=fInConeIds[iPic];
           const HepPDT::ParticleData* 
             PDataIc = fPDGTable->particle(HepPDT::ParticleID(abs(PartIDIc)));
           
           //shoot momentum ratio
           double momR = fRandomGenerator->fire(fMinMomRatio, fMaxMomRatio);
           double massIc= PDataIc->mass().value() ;
           double momIc = momR * mom;
           double energyIc = sqrt(momIc*momIc + massIc*massIc);

           double thetaIc = 2.*atan(exp(-etaIc)) ;
           double pxIc = momIc*sin(thetaIc)*cos(phiIc);
           double pyIc = momIc*sin(thetaIc)*sin(phiIc);
           double pzIc = momIc*cos(thetaIc);

           HepMC::FourVector pIc(pxIc,pyIc,pzIc,energyIc) ;
           HepMC::GenParticle* PartIc = new HepMC::GenParticle(pIc, PartIDIc, 1);
           PartIc->suggest_barcode( barcode ) ;
           barcode++ ;
           Vtx->add_particle_out(PartIc);
           break;
         }//try many times while not in acceptance
       }//loop over the particle Ids in the cone
   }

   fEvt->add_vertex(Vtx) ;
   fEvt->set_event_number(e.id().event()) ;
   fEvt->set_signal_process_id(20) ; 
        
   if ( fVerbosity > 0 )
   {
      fEvt->print() ;  
   }

   auto_ptr<HepMCProduct> BProduct(new HepMCProduct()) ;
   BProduct->addHepMCData( fEvt );
   e.put(BProduct);

   auto_ptr<GenEventInfoProduct> genEventInfo(new GenEventInfoProduct(fEvt));
   e.put(genEventInfo);

   if ( fVerbosity > 0 )
     {
       cout << " MultiParticleInConeGunProducer : Event Generation Done " << endl;
     }
}