EmcRecShowerPosLin.cxx

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//
//    Linear weighted position attribute reconstruction
//
//    Created by Zhe Wang 2004, 5, 16
//
#include "EmcRec/EmcRecShowerPosLin.h"
 
#include <iostream>
#include <fstream>
 
#include "EmcRecGeoSvc/EmcRecGeoSvc.h"
#include "GaudiKernel/Bootstrap.h"
#include "GaudiKernel/ISvcLocator.h"
 
#include "EmcRec/EmcRecParameter.h"
 
void EmcRecShowerPosLin::Position(RecEmcShower& aShower)
{
  RecEmcFractionMap::const_iterator cit;
  HepPoint3D pos(0,0,0);
  HepPoint3D possum(0,0,0);
  double w,wsum;
  double etot;
  //cout<<"EmcRecShowerPosLin::Position Begin"<<endl; 
  
  IEmcRecGeoSvc* iGeoSvc;
  ISvcLocator* svcLocator = Gaudi::svcLocator();
  StatusCode sc = svcLocator->service("EmcRecGeoSvc",iGeoSvc);
  if(sc!=StatusCode::SUCCESS) {
    //cout<<"Error: Can't get EmcRecGeoSvc"<<endl;
  }   
  etot=0;
  //cout<<etot<<endl;
  for(cit=aShower.Begin();cit!=aShower.End();cit++){      
    etot+=(cit->second.getEnergy()*cit->second.getFraction());
    //cout<<etot<<endl;
  }
  wsum=0;
  for(cit=aShower.Begin();cit!=aShower.End();cit++){
    w=(cit->second.getEnergy()*cit->second.getFraction());
    //cout<<w<<endl;
    wsum+=w;
    pos=iGeoSvc->GetCFrontCenter(cit->second.getCellId());
    possum+=pos*w;
  }
 
  if(wsum<=0) {
    cout<<"[[[[[[[[[[[[[[["<<wsum;
  }
 
  pos=possum/wsum;
  //aShower.setPosition(pos);
 
  //----------------------------------------------------------------------
  //position correction
  RecEmcID id = aShower.getShowerId();
  const unsigned int module = EmcID::barrel_ec(id);;
  const unsigned int thetaModule = EmcID::theta_module(id);
  const unsigned int phiModule = EmcID::phi_module(id);
  HepPoint3D posCorr(pos);
 
  if(module==1) {   //barrel
    unsigned int theModule;
    if(thetaModule>21) {
      theModule = 43 - thetaModule;
      id = EmcID::crystal_id(module,theModule,phiModule);
      posCorr.setZ(-posCorr.z());
    } else {
      theModule = thetaModule;
    }
    //cout<<"EmcID: "<<id<<" theta: "<<theModule<<endl;
 
    double IRShift, parTheta[5];
    if(theModule==21) {
      IRShift = 0;
      double par[5] = { 1.698, -1.553, 0.9384, 0.1193, -0.01916 };
      for(int i=0;i<5;i++) {
        parTheta[i] = par[i];
      }
    } else if(theModule==20) {
      IRShift = 2.5;
      double par[5] = { 1.593, -1.582, 0.8881, 0.3298, -0.08856 };
      for(int i=0;i<5;i++) {
        parTheta[i] = par[i];
      }
    } else {
      IRShift = 5.;
      double par[5] = { 1.605, -1.702, 0.8433, 0.3072, -0.1809 };
      for(int i=0;i<5;i++) {
        parTheta[i] = par[i];
      }
    }
 
    HepPoint3D IR(0,0,IRShift);
    HepPoint3D center01, center23;  //center of point0,1 and point2,3 in crystal
    center01 = (iGeoSvc->GetCrystalPoint(id,0)+iGeoSvc->GetCrystalPoint(id,1))/2;
    center23 = (iGeoSvc->GetCrystalPoint(id,2)+iGeoSvc->GetCrystalPoint(id,3))/2;
    //cout<<"before correction: "<<(posCorr-IR).theta()<<"\t"<<posCorr.phi()<<endl;
 
    double theta01,theta23,length,d;
    theta01 = (center01-IR).theta();
    theta23 = (center23-IR).theta();
    length = (center01-IR).mag();
    d = length*tan(theta01-theta23);  //length in x direction
    //cout<<"theta01: "<<theta01<<"\t"<<" theta23: "<<theta23<<"\t"
    //<<" length: "<<length<<" d: "<<d<<endl;
 
    double xIn,xOut,deltaTheta;
    xIn = length*tan(theta01-(posCorr-IR).theta())-d/2;
    xOut = xIn-(parTheta[0]*atan(xIn*parTheta[1]-parTheta[4])+parTheta[2]*xIn+parTheta[3]);
    deltaTheta = atan((xOut+d/2)/length)-atan((xIn+d/2)/length);
    //cout<<"xIn: "<<xIn<<" xOut: "<<xOut<<" deltaTheta: "<<deltaTheta<<endl;
 
    double parPhi1[5] = { 0.7185, -2.539, 0.6759, 0.3472, -0.3108 };  //e-
    double parPhi2[5] = { 0.5781, -2.917, 0.5516, -0.5745, 0.3777 };  //e+
    double parPhi[5];// = { 0.7723, -3.1, 0.6992, -0.1441, -0.01012 }; //by photon, not used
    for(int i=0;i<5;i++) {
      parPhi[i] = (parPhi1[i]+parPhi2[i])/2;  //average of e- and e+
    }
 
    double yIn,yOut,deltaPhi;
    yIn = posCorr.phi() < 0 ? posCorr.phi()*180./CLHEP::pi+360.-phiModule*3.-1.1537
      : posCorr.phi()*180./CLHEP::pi-phiModule*3.-1.1537;
    yOut = parPhi[0]*atan(yIn*parPhi[1]-parPhi[4])+parPhi[2]*yIn+parPhi[3]; 
    deltaPhi = yOut*CLHEP::pi/180.;
    //cout<<"yIn="<<yIn<<"\tyOut="<<yOut<<"\tdeltaPhi="<<deltaPhi<<endl;
 
    HepPoint3D rotateVector(0,1,0);   //y axis
    rotateVector.rotateZ(posCorr.phi());
    posCorr.setZ(posCorr.z()-IRShift);
    posCorr.rotate(-deltaTheta,rotateVector);
    posCorr.setZ(posCorr.z()+IRShift);
    //posCorr.rotateZ(-deltaPhi);
    posCorr.rotateZ(-0.002994);
    //cout<<"after correction: "<<(posCorr-IR).theta()<<"\t"<<posCorr.phi()<<endl;
 
    if(thetaModule>21) {
      posCorr.setZ(-posCorr.z());
    }
  }
 
  aShower.setPosition(posCorr);
 
  //----------------------------------------------------------------------
  if(aShower.energy()<1e-5) return;
 
  double r,theta,phi;
  double dtheta,dphi,dx,dy,dz;
 
  r = posCorr.mag();
  theta = posCorr.theta();
  phi = posCorr.phi();
  //cout<<"theta: "<<theta<<" phi: "<<phi<<endl;
 
  EmcRecParameter& Para=EmcRecParameter::GetInstance();   
  if(aShower.energy()>0) {
    dtheta = Para.SigTheta(0)/sqrt(aShower.energy())+Para.SigTheta(1);
    dphi = Para.SigPhi(0)/sqrt(aShower.energy())+Para.SigPhi(1);
  }
  else {
    dtheta = 0;
    dphi = 0;
  }
  //cout<<"dtheta: "<<dtheta<<" dphi: "<<dphi<<endl;
 
  dx = fabs(iGeoSvc->GetBarrelR()*sin(phi)*dphi);
  dy = fabs(iGeoSvc->GetBarrelR()*cos(phi)*dphi);
  if(theta>0)
    dz = fabs(iGeoSvc->GetBarrelR()*dtheta/(sin(theta)*sin(theta)));
  else
    dz = 0;
  //cout<<" dx: "<<dx<<" dy: "<<dy<<" dz: "<<dz<<endl;
 
  aShower.setDtheta(dtheta);
  aShower.setDphi(dphi);
 
  //----------------------------------------------------------------------
  // Error matrix
  HepSymMatrix matrix(3); //error matrix of r, theta, phi
  matrix[0][0]=0;
  matrix[1][1]=dtheta*dtheta;
  matrix[2][2]=dphi*dphi;
  matrix[0][1]=0;
  matrix[0][2]=0;
  matrix[1][2]=0;
  //cout<<"matrix: \n"<<matrix;
 
  HepMatrix matrix1(3,3),matrix2(3,3);
  matrix1[0][0]=sin(theta)*cos(phi);
  matrix1[0][1]=r*cos(theta)*cos(phi);
  matrix1[0][2]=-r*sin(theta)*sin(phi);
  matrix1[1][0]=sin(theta)*sin(phi);
  matrix1[1][1]=r*cos(theta)*sin(phi);
  matrix1[1][2]=r*sin(theta)*cos(phi);
  matrix1[2][0]=cos(theta);
  matrix1[2][1]=-r*sin(theta);
  matrix1[2][2]=0;
  //cout<<"matrix1: \n"<<matrix1;
 
  for(int i=0;i<3;i++) {
    for(int j=0;j<3;j++) {
      matrix2[i][j]=matrix1[j][i];
    }
  }
  //cout<<"matrix2: \n"<<matrix2;
 
  HepMatrix matrix4(3,3);
  matrix4=matrix1*matrix*matrix2;
  //cout<<"matrix4: \n"<<matrix4;
 
  HepSymMatrix matrix5(3); //error matrix of x, y, z
  for(int i=0;i<3;i++) {
    for(int j=0;j<=i;j++) {
      matrix5[i][j]=matrix4[i][j];
    }
  }
  //cout<<"matrix5: \n"<<matrix5;
 
  aShower.setErrorMatrix(matrix5);
}