/data/refman/pasoursint/CMSSW_5_3_1/src/RecoEcal/EgammaCoreTools/plugins/EcalClusterEnergyUncertainty.cc

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#include "RecoEcal/EgammaCoreTools/plugins/EcalClusterEnergyUncertainty.h"


float EcalClusterEnergyUncertainty::getValue( const reco::SuperCluster & superCluster, const int mode ) const
{
        checkInit();
        // mode  = -1 returns negative energy uncertainty 
        //       = +1 returns positive energy uncertainty 
        //       =  0 (default) returns overall  energy uncertainty 
        float en = superCluster.energy(); 
        float eta = fabs(superCluster.eta()); 
        float et = en/cosh(eta); 
        float brem = superCluster.phiWidth()/superCluster.etaWidth(); 
        
        int offset = 0; 
        
        //if ( superCluster.algoID() == reco::CaloCluster::hybrid ) offset = 0; 
        //else if ( superCluster.algoID() == reco::CaloCluster::multi5x5 ) offset = 36; 
        // TEMPORARY FIX!!
        if ( eta < 1.5 ) offset = 0; 
        else if ( eta >= 1.5 ) offset = 36; 
        else { 
          // not supported now 
          //std::cout << "Not supported value " << superCluster.algoID() << std::endl;
          //std::cout << "eta = " << superCluster.eta() << std::endl;
          //std::cout << "phi = " << superCluster.phi() << std::endl;
          //std::cout << "En  = " << superCluster.energy() << std::endl;
          return -1; 
        }
        if ( mode ==  0 ) offset += 0; // total effective uncertainty 
        else if ( mode == -1 ) offset += 12;  // negative energy uncertainty 
        else if ( mode ==  1 ) offset += 24;  // positive energy uncertainty 
        else {
          // wrong input
          return 0;
        }

        float br0_0 = (params_->params())[offset + 0]; 
        float br0_1 = (params_->params())[offset + 1]; 
        float br0_2 = (params_->params())[offset + 2]; 
        float br0_3 = (params_->params())[offset + 3]; 
        
        float br1_0 = (params_->params())[offset + 4];  
        float br1_1 = (params_->params())[offset + 5];  
        float br1_2 = (params_->params())[offset + 6];  
        float br1_3 = (params_->params())[offset + 7];  
        
        float br2_0 = (params_->params())[offset + 8];  
        float br2_1 = (params_->params())[offset + 9];  
        float br2_2 = (params_->params())[offset + 10];  
        float br2_3 = (params_->params())[offset + 11];  
        
        float p0 = (br0_0 + br0_1*brem) + (br0_2 + br0_3*brem)/et;  
        float p1 = (br1_0 + br1_1*brem) + (br1_2 + br1_3*brem)/et;  
        float p2 = (br2_0 + br2_1*brem) + (br2_2 + br2_3*brem)/et;  
        //std::cout << "====================================================" << std::endl;
        //std::cout << "et = " << et << "\t eta = " << eta << std::endl;
        //std::cout << "p0 = " << p0 << "\t p1 = " << p1 << "\t p2 = " << p2 << std::endl;
        float uncertainty = en*(p0 + p1*fabs(eta) + p2*eta*eta);  
        //std::cout << uncertainty << std::endl;
        //std::cout << std::endl;
        return uncertainty;  


}

#include "RecoEcal/EgammaCoreTools/interface/EcalClusterFunctionFactory.h"
DEFINE_EDM_PLUGIN( EcalClusterFunctionFactory, EcalClusterEnergyUncertainty, "EcalClusterEnergyUncertainty");