PWG1/AliESDRecKinkInfo.cxx

   1 /**************************************************************************
   2  * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   3  *                                                                        *
   4  * Author: The ALICE Off-line Project.                                    *
   5  * Contributors are mentioned in the code where appropriate.              *
   6  *                                                                        *
   7  * Permission to use, copy, modify and distribute this software and its   *
   8  * documentation strictly for non-commercial purposes is hereby granted   *
   9  * without fee, provided that the above copyright notice appears in all   *
  10  * copies and that both the copyright notice and this permission notice   *
  11  * appear in the supporting documentation. The authors make no claims     *
  12  * about the suitability of this software for any purpose. It is          *
  13  * provided "as is" without express or implied warranty.                  *
  14  **************************************************************************/
  15
  16
  17 ///////////////////////////////////////////////////////////////////////////////
  18 //                                                                           //
  19 //  Time Projection Chamber                                                  //
  20 //  Comparison macro for reconstructed tracks - ESDs V0s                                     //
  21 //  responsible:
  22 //  marian.ivanov@cern.ch                                                    //
  23 //
  24 //
  25
  26
  27
  28
  29
  30 #include <stdio.h>
  31 #include <string.h>
  32 //ROOT includes
  33 #include "Rtypes.h"
  34 //
  35 //ALIROOT includes
  36 //
  37 #include "AliESDtrack.h"
  38 #include "AliTPCParam.h"
  39 #include "AliTrackReference.h"
  40 #include "AliTPCParamSR.h"
  41 #include "AliESD.h"
  42 #include "AliESDfriend.h"
  43 #include "AliESDtrack.h"
  44 #include "AliTPCseed.h"
  45 #include "AliITStrackMI.h"
  46 #include "AliTRDtrack.h"
  47 #include "AliHelix.h"
  48 #include "AliESDVertex.h"
  49 #include "AliExternalTrackParam.h"
  50 #include "AliESDkink.h"
  51 #include "AliESDv0.h"
  52 #include "AliV0.h"
  53 //
  54 #include "AliTreeDraw.h"
  55 #include "AliMCInfo.h"
  56 #include "AliGenKinkInfo.h"
  57 #include "AliGenV0Info.h"
  58 #include "AliESDRecKinkInfo.h"
  59
  60
  61
  62 ClassImp(AliESDRecKinkInfo)
  63
  64
  65
  66
  67
  68 ////
  69 void  AliESDRecKinkInfo::Update()
  70 {
  71
  72   if ( (fT1.fTPCOn)&& (fT2.fTPCOn)){
  73     //
  74     // IF BOTH RECONSTRUCTED
  75     Float_t distance1,distance2;
  76     Double_t xx[3],pp[3];
  77     //
  78     Double_t xd[3],pd[3],signd;
  79     Double_t xm[3],pm[3],signm;
  80     for (Int_t i=0;i<3;i++){
  81       xd[i] = fT2.fTPCinR1[i];
  82       pd[i] = fT2.fTPCinP1[i];
  83       xm[i] = fT1.fTPCinR1[i];
  84       pm[i] = fT1.fTPCinP1[i];
  85     }
  86     signd =  fT2.fSign<0 ? -1:1;
  87     signm =  fT1.fSign<0 ? -1:1;
  88
  89     AliHelix dhelix1(xd,pd,signd);
  90     dhelix1.GetMomentum(0,pp,0);
  91     dhelix1.Evaluate(0,xx);
  92     //
  93     //  Double_t x2[3],p2[3];
  94     //
  95     AliHelix mhelix(xm,pm,signm);
  96     //
  97     //find intersection linear
  98     //
  99     Double_t phase[2][2],radius[2];
 100     Int_t  points = dhelix1.GetRPHIintersections(mhelix, phase, radius,200);
 101     Double_t delta1=10000,delta2=10000;
 102
 103     if (points==1){
 104       fMinR = TMath::Sqrt(radius[0]);
 105     }
 106     if (points==2){
 107       fMinR =TMath::Min(TMath::Sqrt(radius[0]),TMath::Sqrt(radius[1]));
 108     }
 109
 110     if (points>0){
 111       dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
 112       dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
 113       dhelix1.LinearDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
 114     }
 115     if (points==2){
 116       dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
 117       dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
 118       dhelix1.LinearDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
 119     }
 120     if (points==1){
 121       fMinR = TMath::Sqrt(radius[0]);
 122       fDistMinR = delta1;
 123     }
 124     if (points==2){
 125       if (radius[0]<radius[1]){
 126         fMinR = TMath::Sqrt(radius[0]);
 127         fDistMinR = delta1;
 128       }
 129       else{
 130         fMinR = TMath::Sqrt(radius[1]);
 131         fDistMinR = delta2;
 132       }
 133     }
 134     //
 135     //
 136     distance1 = TMath::Min(delta1,delta2);
 137     //
 138     //find intersection parabolic
 139     //
 140     points = dhelix1.GetRPHIintersections(mhelix, phase, radius);
 141     delta1=10000,delta2=10000;
 142
 143     if (points>0){
 144       dhelix1.ParabolicDCA(mhelix,phase[0][0],phase[0][1],radius[0],delta1);
 145     }
 146     if (points==2){
 147       dhelix1.ParabolicDCA(mhelix,phase[1][0],phase[1][1],radius[1],delta2);
 148     }
 149
 150     distance2 = TMath::Min(delta1,delta2);
 151     if (delta1<delta2){
 152       //get V0 info
 153       dhelix1.Evaluate(phase[0][0],fXr);
 154       dhelix1.GetMomentum(phase[0][0],fPdr);
 155       mhelix.GetMomentum(phase[0][1],fPm);
 156       dhelix1.GetAngle(phase[0][0],mhelix,phase[0][1],fAngle);
 157       fRr = TMath::Sqrt(radius[0]);
 158     }
 159     else{
 160       dhelix1.Evaluate(phase[1][0],fXr);
 161       dhelix1.GetMomentum(phase[1][0], fPdr);
 162       mhelix.GetMomentum(phase[1][1], fPm);
 163       dhelix1.GetAngle(phase[1][0],mhelix,phase[1][1],fAngle);
 164       fRr = TMath::Sqrt(radius[1]);
 165     }
 166     fDist1 = TMath::Sqrt(distance1);
 167     fDist2 = TMath::Sqrt(distance2);
 168
 169     if (fDist2<10.5){
 170       Double_t x,alpha,param[5],cov[15];
 171       //
 172       fT1.GetESDtrack()->GetInnerExternalParameters(alpha,x,param);
 173       fT1.GetESDtrack()->GetInnerExternalCovariance(cov);
 174       AliExternalTrackParam paramm(x,alpha,param,cov);
 175       //
 176       fT2.GetESDtrack()->GetInnerExternalParameters(alpha,x,param);
 177       fT2.GetESDtrack()->GetInnerExternalCovariance(cov);
 178       AliExternalTrackParam paramd(x,alpha,param,cov);
 179       /*
 180       AliESDkink kink;
 181       kink.Update(&paramm,&paramd);
 182       //      kink.Dump();
 183       Double_t diff  = kink.fRr-fRr;
 184       Double_t diff2 = kink.fDist2-fDist2;
 185       printf("Diff\t%f\t%f\n",diff,diff2);
 186       */
 187     }
 188
 189     //
 190     //
 191   }
 192
 193 }
 194