/data/refman/pasoursint/CMSSW_4_1_8_patch12/src/FastSimulation/ForwardDetectors/plugins/CastorFastTowerProducer.cc

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// -*- C++ -*-
//
// Package:    CastorFastTowerProducer
// Class:      CastorFastTowerProducer
// 
//
// Original Author:  Hans Van Haevermaet
//         Created:  Thu Mar 13 12:00:56 CET 2008
// $Id: CastorFastTowerProducer.cc,v 1.2 2009/03/28 08:25:19 hvanhaev Exp $
//
//


// system include files
#include <memory>
#include <vector>
#include <iostream>
#include <sstream>
#include <TMath.h>
#include <TRandom3.h>
#include <TF1.h>

// user include files
#include "FWCore/Framework/interface/Frameworkfwd.h"
#include "FWCore/Framework/interface/EDProducer.h"

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

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

#include "DataFormats/Math/interface/Point3D.h"

// Castorobject includes
#include "DataFormats/CastorReco/interface/CastorTower.h"
#include "DataFormats/CastorReco/interface/CastorCell.h"

// genCandidate particle includes
#include "DataFormats/Candidate/interface/Candidate.h"
#include "DataFormats/HepMCCandidate/interface/GenParticle.h"

#include "FastSimulation/ForwardDetectors/plugins/CastorFastTowerProducer.h"


//
// constructors and destructor
//
CastorFastTowerProducer::CastorFastTowerProducer(const edm::ParameterSet& iConfig) 
{
   //register your products
   produces<CastorTowerCollection>();
   
   //now do what ever other initialization is needed

}


CastorFastTowerProducer::~CastorFastTowerProducer()
{
 
   // do anything here that needs to be done at desctruction time
   // (e.g. close files, deallocate resources etc.)

}


//
// member functions
//

// ------------ method called to produce the data  ------------
void
CastorFastTowerProducer::produce(edm::Event& iEvent, const edm::EventSetup& iSetup)
{
   using namespace edm;
   using namespace reco;
   using namespace std;
   using namespace TMath;
   
   //
   // Make CastorTower objects
   //
   
   //cout << "entering event" << endl;
   
   Handle<GenParticleCollection> genParticles;
   iEvent.getByLabel("genParticles", genParticles);
   
   // make pointer to towers that will be made
   auto_ptr<CastorTowerCollection> CastorTowers (new CastorTowerCollection);
   
   // declare castor array
   double castorplus [4][16]; // (0,x): Energies - (1,x): emEnergies - (2,x): hadEnergies - (3,x): phi position - eta = 5.9
   double castormin [4][16];  // (0,x): Energies - (1,x): emEnergies - (2,x): hadEnergies - (3,x): phi position - eta = -5.9
   // set phi values of array sectors and everything else to zero
   for (int j = 0; j < 16; j++) {
        castorplus[3][j] = -2.94524 + j*0.3927;
        castormin[3][j] = -2.94524 + j*0.3927;
        castorplus[0][j] = 0.;
        castormin[0][j] = 0.;
        castorplus[1][j] = 0.;
        castormin[1][j] = 0.;
        castorplus[2][j] = 0.;
        castormin[2][j] = 0.; 
        //castorplus[4][j] = 0.;
        //castormin[4][j] = 0.;
   }
   
   // declare properties vectors
   vector<double> depthplus[16];
   vector<double> depthmin[16];
   vector<double> fhotplus [16];
   vector<double> fhotmin [16];
   vector<double> energyplus [16];
   vector<double> energymin [16];
   //vector<double> femplus [16];
   //vector<double> femmin [16];
   
   for (int i=0;i<16;i++) {
        depthplus[i].clear();
        depthmin[i].clear();
        fhotplus[i].clear();
        fhotmin[i].clear();
        energyplus[i].clear();
        energymin[i].clear();
        //femplus[i].clear();
        //femmin[i].clear();
   }
   
   //cout << "declared everything" << endl;
   
   // start particle loop
   for (size_t i = 0; i < genParticles->size(); ++i) {
        const Candidate & p = (*genParticles)[i];
        
        // select particles in castor
        if ( fabs(p.eta()) > 5.2 && fabs(p.eta()) < 6.6) {
        
            //cout << "found particle in castor, start calculating" << endl;
            
            // declare energies
            //double gaus_E = -1.; 
            double energy = -1.;
            double emEnergy = 0.;
            double hadEnergy = 0.;
            double fhot = 0.;
            double depth = 0.;
            //double fem = 0.;
            
            // add energies - em: if particle is e- or gamma
            if (p.pdgId() == 11 || p.pdgId() == 22) {
                
                // calculate primary tower energy for electrons
                while ( energy < 0.) {
                // apply energy smearing with gaussian random generator
                TRandom3 r(0);
                // use sigma/E parametrization from the full simulation
                double mean = 1.0024*p.energy() - 0.3859;
                double sigma = 0.0228*p.energy() + 2.1061;
                energy = r.Gaus(mean,sigma);
                }
            
                // calculate electromagnetic electron/photon energy leakage
                double tmax;
                double a;
                double cte;
                if ( p.pdgId() == 11) { cte = -0.5; } else { cte = 0.5; }
                tmax = 1.0*(log(energy/0.0015)+cte);
                a = tmax*0.5 + 1;
                double leakage;
                double x = 0.5*19.38;
                leakage = energy - energy*Gamma(a,x);
                
                // add emEnergy
                emEnergy = energy - leakage;
                // add hadEnergy leakage
                hadEnergy = leakage;
                
                // calculate EM depth from parametrization
                double d0 = 0.2338 * pow(p.energy(),-0.1634);
                double d1 = 5.4336 * pow(p.energy(),0.2410) + 14408.1025;
                double d2 = 1.4692 * pow(p.energy(),0.1307) - 0.5216; 
                if (d0 < 0.) d0 = abs(d0);
                
                TF1 *fdepth = new TF1("fdepth","[0] * TMath::Exp(-0.5*( (x-[1])/[2] + TMath::Exp(-(x-[1])/[2])))",14400.,14460.); 
                fdepth->SetParameters(d0,d1,d2);
                depth = fdepth->GetRandom();
                fdepth->Delete();
                if (p.eta() < 0.) depth = -1*depth;
                
            } else {
                
                // calculate primary tower energy for hadrons
                while (energy < 0.) {
                // apply energy smearing with gaussian random generator
                TRandom3 r(0);
                // use sigma/E parametrization from the full simulation
                double mean = 0.8340*p.energy() - 8.5054;
                double sigma = 0.1595*p.energy() + 3.1183;
                energy = r.Gaus(mean,sigma);
                }
                
                // add hadEnergy
                hadEnergy = energy;
                
                // in the near future add fem parametrization
                
                // calculate depth for HAD particle from parametrization
                double d0 = -0.000012 * p.energy() + 0.0661;
                double d1 = 785.7524 * pow(p.energy(),0.0262) + 13663.4262;
                double d2 = 9.8748 * pow(p.energy(),0.1720) + 37.0187; 
                if (d0 < 0.) d0 = abs(d0);
                
                TF1 *fdepth = new TF1("fdepth","[0] * TMath::Exp(-0.5*( (x-[1])/[2] + TMath::Exp(-(x-[1])/[2]) ))",14400.,15500.);
                fdepth->SetParameters(d0,d1,d2);
                depth = fdepth->GetRandom();
                fdepth->Delete();
                if (p.eta() < 0.) depth = -1*depth;
                

            }
            
            // make tower
            
            // set sector
            int sector = -1;
            for (int j = 0; j < 16; j++) {
                double a = -M_PI + j*0.3927;
                double b = -M_PI + (j+1)*0.3927;
                if ( (p.phi() > a) && (p.phi() < b)) {  
                   sector = j;
                }
            }
            
            // set eta
            if (p.eta() > 0) { 
                castorplus[0][sector] = castorplus[0][sector] + energy;
                castorplus[1][sector] = castorplus[1][sector] + emEnergy;
                castorplus[2][sector] = castorplus[2][sector] + hadEnergy;
                
                depthplus[sector].push_back(depth);
                fhotplus[sector].push_back(fhot);
                energyplus[sector].push_back(energy);
                //cout << "filled vectors" << endl;
                //cout << "energyplus size = " << energyplus[sector].size() << endl;
                //cout << "depthplus size = " << depthplus[sector].size() << endl;
                //cout << "fhotplus size = " << fhotplus[sector].size() << endl;
                
            } else { 
                castormin[0][sector] = castormin[0][sector] + energy;
                castormin[1][sector] = castormin[1][sector] + emEnergy;
                castormin[2][sector] = castormin[2][sector] + hadEnergy;
                
                
                depthmin[sector].push_back(depth);
                fhotmin[sector].push_back(fhot);
                energymin[sector].push_back(energy);
                //cout << "filled vectors" << endl;
                
            }
            
        }
        
   }
   
   
   // add and substract pedestals/noise
   for (int j = 0; j < 16; j++) {
        double hadnoise = 0.;
        double emnoise = 0.;
        for (int i=0;i<12;i++) {
                hadnoise = hadnoise + make_noise();
                if (i<2) emnoise = emnoise + make_noise();
        }
        
        hadnoise = hadnoise - 12*0.053;
        emnoise = emnoise - 2*0.053;
        if ( hadnoise < 0.) hadnoise = 0.;
        if ( emnoise < 0.) emnoise = 0.;
        double totnoise = hadnoise + emnoise;
        
        // add random noise
        castorplus[0][j] = castorplus[0][j] + totnoise;
        castormin[0][j] = castormin[0][j] + totnoise;
        castorplus[1][j] = castorplus[1][j] + emnoise;
        castormin[1][j] = castormin[1][j] + emnoise;
        castorplus[2][j] = castorplus[2][j] + hadnoise;
        castormin[2][j] = castormin[2][j] + hadnoise; 

        //cout << "after constant substraction" << endl;
        //cout << "total noise = " << castorplus[0][j] << " em noise = " << castorplus[1][j] << " had noise = " << castorplus[2][j] << endl;
        //cout << "fem should be = " << castorplus[1][j]/castorplus[0][j] << endl;
        
   }
   
   
   // store towers from castor arrays
   // eta = 5.9
   for (int j=0;j<16;j++) {
        if (castorplus[0][j] != 0.) {
            
            double fem = 0.;
            fem = castorplus[1][j]/castorplus[0][j]; 
            TowerPoint pt1(88.5,5.9,castorplus[3][j]);
            Point pt2(pt1); 
            
            //cout << "fem became = " << castorplus[1][j]/castorplus[0][j] << endl;
            
            double depth_mean = 0.;
            double fhot_mean = 0.;
            double sum_energy = 0.;
            
            //cout << "energyplus size = " << energyplus[j].size()<< endl;
            for (size_t p = 0; p<energyplus[j].size();p++) {
                depth_mean = depth_mean + depthplus[j][p]*energyplus[j][p];
                fhot_mean = fhot_mean + fhotplus[j][p]*energyplus[j][p];
                sum_energy = sum_energy + energyplus[j][p];
            }
            depth_mean = depth_mean/sum_energy;
            fhot_mean = fhot_mean/sum_energy;
            //cout << "computed depth/fhot" << endl;
            
            
            //std::vector<CastorCell> usedCells;
            CastorCellRefVector refvector;
            CastorTowers->push_back(reco::CastorTower(castorplus[0][j],pt2,castorplus[1][j],castorplus[2][j],fem,depth_mean,fhot_mean,refvector));      
        }
   }
   // eta = -5.9
   for (int j=0;j<16;j++) {
        if (castormin[0][j] != 0.) {
            double fem = 0.;
            fem = castormin[1][j]/castormin[0][j]; 
            TowerPoint pt1(88.5,-5.9,castormin[3][j]);
            Point pt2(pt1); 
            
            double depth_mean = 0.;
            double fhot_mean = 0.;
            double sum_energy = 0.;
            
            
            for (size_t p = 0; p<energymin[j].size();p++) {
                depth_mean = depth_mean + depthmin[j][p]*energymin[j][p];
                fhot_mean = fhot_mean + fhotmin[j][p]*energymin[j][p];
                sum_energy = sum_energy + energymin[j][p];
            }
            depth_mean = depth_mean/sum_energy;
            fhot_mean = fhot_mean/sum_energy;
            
            
            //std::vector<CastorCell> usedCells;
            CastorCellRefVector refvector;
            CastorTowers->push_back(reco::CastorTower(castormin[0][j],pt2,castormin[1][j],castormin[2][j],fem,depth_mean,fhot_mean,refvector)); 
        }
   }
        
   iEvent.put(CastorTowers); 
   
}

double CastorFastTowerProducer::make_noise() {
        double result = -1.;
        TRandom3 r2(0);
        double mu_noise = 0.053; // GeV (from 1.214 ADC) per channel
        double sigma_noise = 0.027; // GeV (from 0.6168 ADC) per channel
        
        while (result < 0.) {
                result = r2.Gaus(mu_noise,sigma_noise);
        }
        
        return result;
}


// ------------ method called once each job just before starting event loop  ------------
void 
CastorFastTowerProducer::beginRun(edm::Run& run, edm::EventSetup const& es)
{
}

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

//define this as a plug-in
DEFINE_FWK_MODULE(CastorFastTowerProducer);