MUON/AliMUONTriggerTrack.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 // $Id$
  17
  18 //-----------------------------------------------------------------------------
  19 // Class AliMUONTriggerTrack
  20 //---------------------------
  21 // Reconstructed Trigger track in ALICE dimuon spectrometer
  22 // Note: equivalent to AliMUONTriggerTrack for tracking,
  23 // No need for a AliMUONTriggerTrackParam
  24 // Author: Philippe Crochet
  25 //-----------------------------------------------------------------------------
  26
  27 #include "AliMUONTriggerTrack.h"
  28 #include "AliMUONTrackReconstructor.h"
  29 #include "TString.h"
  30 #include <Riostream.h>
  31 #include "AliLog.h"
  32
  33 /// \cond CLASSIMP
  34 ClassImp(AliMUONTriggerTrack)
  35 /// \endcond
  36
  37 //__________________________________________________________________________
  38 AliMUONTriggerTrack::AliMUONTriggerTrack()
  39   : TObject(),
  40     fx11(0),
  41     fy11(0),
  42     fz11(0.),
  43     fz21(0.),
  44     fSlopeX(0),
  45     fSlopeY(0),
  46     floTrgNum(0),
  47     fGTPattern(0),
  48     fHitsPatternInTrigCh(0),
  49     fCovariances(0x0)
  50 {
  51   /// default ctr
  52       AliDebug(5,Form("this=%p",this));
  53 }
  54 //__________________________________________________________________________
  55 AliMUONTriggerTrack::AliMUONTriggerTrack(Float_t x11, Float_t y11, Float_t z11, Float_t z21, Float_t slopeX, Float_t slopeY, Int_t loTrgNum, Long_t theGTPattern, UShort_t hitsPatternInTrigCh)
  56     : TObject(),
  57       fx11(x11),
  58       fy11(y11),
  59       fz11(z11),
  60       fz21(z21),
  61       fSlopeX(slopeX),
  62       fSlopeY(slopeY),
  63       floTrgNum(loTrgNum),
  64       fGTPattern(theGTPattern),
  65       fHitsPatternInTrigCh(hitsPatternInTrigCh),
  66       fCovariances(0x0)
  67 {
  68 /// ctor from local trigger output
  69         AliDebug(5,Form("this=%p x11=%f y11=%f z11=%f z21=%f slopeX=%f slopeY=%f loTrgNum=%d GTPattern=%ld HitsPatternInTrigCh %i",
  70                         this,x11,y11,z11,z21,slopeX,slopeY,loTrgNum,theGTPattern,fHitsPatternInTrigCh));
  71
  72 }
  73
  74 //__________________________________________________________________________
  75 AliMUONTriggerTrack::~AliMUONTriggerTrack()
  76 {
  77   /// Destructor
  78   AliDebug(5,Form("this=%p",this));
  79   if (fCovariances) {
  80     delete fCovariances;
  81     fCovariances = 0x0;
  82   }
  83 }
  84
  85 //__________________________________________________________________________
  86 AliMUONTriggerTrack::AliMUONTriggerTrack (const AliMUONTriggerTrack& theMUONTriggerTrack)
  87     : TObject(theMUONTriggerTrack),
  88       fx11(theMUONTriggerTrack.fx11),
  89       fy11(theMUONTriggerTrack.fy11),
  90       fz11(theMUONTriggerTrack.fz11),
  91       fz21(theMUONTriggerTrack.fz21),
  92       fSlopeX(theMUONTriggerTrack.fSlopeX),
  93       fSlopeY(theMUONTriggerTrack.fSlopeY),
  94       floTrgNum(theMUONTriggerTrack.floTrgNum),
  95       fGTPattern(theMUONTriggerTrack.fGTPattern),
  96       fHitsPatternInTrigCh(theMUONTriggerTrack.fHitsPatternInTrigCh),
  97       fCovariances(0x0)
  98 {
  99 ///
 100 /// copy ctor
 101 ///
 102   if (theMUONTriggerTrack.fCovariances) fCovariances = new TMatrixD(*(theMUONTriggerTrack.fCovariances));
 103   AliDebug(5,Form("this=%p copy ctor",this));
 104
 105 }
 106
 107 //__________________________________________________________________________
 108 AliMUONTriggerTrack & AliMUONTriggerTrack::operator=(const AliMUONTriggerTrack&
 109 theMUONTriggerTrack)
 110 {
 111 /// Assignment operator
 112
 113     // check assignement to self
 114     if (this == &theMUONTriggerTrack)
 115         return *this;
 116
 117     /// base class assignement
 118     TObject::operator=(theMUONTriggerTrack);
 119
 120     fx11 = theMUONTriggerTrack.fx11;
 121     fy11 = theMUONTriggerTrack.fy11;
 122     fz11 = theMUONTriggerTrack.fz11;
 123     fz21 = theMUONTriggerTrack.fz21;
 124     fSlopeX = theMUONTriggerTrack.fSlopeX;
 125     fSlopeY = theMUONTriggerTrack.fSlopeY;
 126     floTrgNum = theMUONTriggerTrack.floTrgNum;
 127     fGTPattern = theMUONTriggerTrack.fGTPattern;
 128     fHitsPatternInTrigCh = theMUONTriggerTrack.fHitsPatternInTrigCh;
 129
 130     if (theMUONTriggerTrack.fCovariances) {
 131       if (fCovariances) *fCovariances = *(theMUONTriggerTrack.fCovariances);
 132       else fCovariances = new TMatrixD(*(theMUONTriggerTrack.fCovariances));
 133     } else {
 134       delete fCovariances;
 135       fCovariances = 0x0;
 136     }
 137
 138     return *this;
 139 }
 140
 141 //__________________________________________________________________________
 142 void
 143 AliMUONTriggerTrack::Print(Option_t* opt) const
 144 {
 145 /// Printing
 146   TString optString(opt);
 147   optString.ToUpper();
 148   if ( optString.Contains("FULL") ) optString = "PARAM COV";
 149
 150   if ( optString.Contains("PARAM"))
 151     cout << Form("(X,Y,Z)11=(%7.2f,%7.2f,%7.2f) Z21=%7.2f Slope(X,Y)=(%7.2f,%7.2f) LocalBoard #%3d GlobalTriggerPattern %x HitsPatternInTrigCh %x",
 152                  fx11,fy11,fz11,fz21,fSlopeX,fSlopeY,floTrgNum,fGTPattern,fHitsPatternInTrigCh) << endl;
 153
 154   if ( optString.Contains("COV") ){
 155     if ( ! fCovariances ) cout << "Covariances not initialized " << endl;
 156     else fCovariances->Print();
 157   }
 158 }
 159
 160 //__________________________________________________________________________
 161 void AliMUONTriggerTrack::SetCovariances(const TMatrixD& covariances)
 162 {
 163   /// Set the covariance matrix
 164   if (fCovariances) *fCovariances = covariances;
 165   else fCovariances = new TMatrixD(covariances);
 166 }
 167
 168 //__________________________________________________________________________
 169 void AliMUONTriggerTrack::SetCovariances(const Double_t matrix[3][3])
 170 {
 171   /// Set the covariance matrix
 172   if (fCovariances) fCovariances->SetMatrixArray(&(matrix[0][0]));
 173   else fCovariances = new TMatrixD(3,3,&(matrix[0][0]));
 174 }
 175
 176 //__________________________________________________________________________
 177 const TMatrixD& AliMUONTriggerTrack::GetCovariances() const
 178 {
 179   /// Return the covariance matrix (create it before if needed)
 180   if (!fCovariances) {
 181     fCovariances = new TMatrixD(3,3);
 182     fCovariances->Zero();
 183   }
 184   return *fCovariances;
 185 }
 186
 187 //__________________________________________________________________________
 188 Bool_t AliMUONTriggerTrack::Match(AliMUONTriggerTrack &track,
 189                                   Double_t sigmaCut) const
 190 {
 191   /// Try to match this track with the given track. Matching conditions:
 192   /// - x, y position and y slope within sigmaCut
 193
 194   // Find the track with the covariances correctly set
 195   // Extrapolate to the z of the other track
 196   Bool_t hasCov1 = ( GetCovariances().NonZeros() != 0 );
 197   Bool_t hasCov2 = ( track.GetCovariances().NonZeros() != 0 );
 198
 199   const AliMUONTriggerTrack* trackToExtrap = ( hasCov2 ) ? &track : this;
 200   const AliMUONTriggerTrack* fixedTrack = ( hasCov2 ) ? this : &track;
 201
 202   TMatrixD paramDiff(3,1);
 203   Double_t deltaZ = fixedTrack->GetZ11() - trackToExtrap->GetZ11();
 204   paramDiff(0,0) = fixedTrack->GetX11() - trackToExtrap->GetX11();
 205   paramDiff(1,0) = fixedTrack->GetY11() - ( trackToExtrap->GetY11() + trackToExtrap->GetSlopeY() * deltaZ );
 206   paramDiff(2,0) = fixedTrack->GetSlopeY() - trackToExtrap->GetSlopeY();
 207   Double_t chi2 = 0.;
 208
 209   TMatrixD cov1(fixedTrack->GetCovariances());
 210   TMatrixD cov2(trackToExtrap->GetCovariances());
 211
 212   // Extrapolate covariances to z
 213   if ( deltaZ != 0 ) {
 214     if ( hasCov1 || hasCov2 ){
 215       TMatrixD jacob(3,3);
 216       jacob.UnitMatrix();
 217       jacob(1,2) = deltaZ;
 218       TMatrixD tmp(trackToExtrap->GetCovariances(),TMatrixD::kMultTranspose,jacob);
 219       TMatrixD tmp2(jacob,TMatrixD::kMult,tmp);
 220       cov2 = tmp2;
 221     }
 222   }
 223
 224   AliDebug(3, Form("track1 Y11 %f  track2 Y11: %f (Z11 %f)  -> %f (Z11 %f)", fixedTrack->GetY11(), trackToExtrap->GetY11(), trackToExtrap->GetZ11(), trackToExtrap->GetY11() + trackToExtrap->GetSlopeY() * deltaZ, fixedTrack->GetZ11()));
 225
 226   TMatrixD sumCov(cov1,TMatrixD::kPlus,cov2);
 227   if (sumCov.Determinant() != 0) {
 228     sumCov.Invert();
 229     TMatrixD tmp(sumCov,TMatrixD::kMult,paramDiff);
 230     TMatrixD chi2M(paramDiff,TMatrixD::kTransposeMult,tmp);
 231     chi2 = chi2M(0,0);
 232   } else {
 233     AliWarning(" Determinant = 0");
 234     Double_t sigma2 = 0.;
 235     for (Int_t iVar = 0; iVar < 3; iVar++) {
 236       sigma2 = cov1(iVar,iVar) + cov2(iVar,iVar);
 237       chi2 += paramDiff(iVar,0) * paramDiff(iVar,0) / sigma2;
 238     }
 239   }
 240
 241   if ( chi2/3 > sigmaCut * sigmaCut )
 242     return kFALSE;
 243
 244   return kTRUE;
 245 }