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     fPtCutLevel(0),
  49     fHitsPatternInTrigCh(0),
  50     fCovariances(0x0)
  51 {
  52   /// default ctr
  53       AliDebug(5,Form("this=%p",this));
  54 }
  55 //__________________________________________________________________________
  56 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, Int_t ptCutLevel)
  57     : TObject(),
  58       fx11(x11),
  59       fy11(y11),
  60       fz11(z11),
  61       fz21(z21),
  62       fSlopeX(slopeX),
  63       fSlopeY(slopeY),
  64       floTrgNum(loTrgNum),
  65       fGTPattern(theGTPattern),
  66       fPtCutLevel(ptCutLevel),
  67       fHitsPatternInTrigCh(0),
  68       fCovariances(0x0)
  69 {
  70 /// ctor from local trigger output
  71         AliDebug(5,Form("this=%p x11=%f y11=%f z11=%f z21=%f slopeX=%f slopeY=%f loTrgNum=%d GTPattern=%ld HitsPatternInTrigCh %i",
  72                         this,x11,y11,z11,z21,slopeX,slopeY,loTrgNum,theGTPattern,fHitsPatternInTrigCh));
  73
  74 }
  75
  76 //__________________________________________________________________________
  77 AliMUONTriggerTrack::~AliMUONTriggerTrack()
  78 {
  79   /// Destructor
  80   AliDebug(5,Form("this=%p",this));
  81   if (fCovariances) {
  82     delete fCovariances;
  83     fCovariances = 0x0;
  84   }
  85 }
  86
  87 //__________________________________________________________________________
  88 AliMUONTriggerTrack::AliMUONTriggerTrack (const AliMUONTriggerTrack& theMUONTriggerTrack)
  89     : TObject(theMUONTriggerTrack),
  90       fx11(theMUONTriggerTrack.fx11),
  91       fy11(theMUONTriggerTrack.fy11),
  92       fz11(theMUONTriggerTrack.fz11),
  93       fz21(theMUONTriggerTrack.fz21),
  94       fSlopeX(theMUONTriggerTrack.fSlopeX),
  95       fSlopeY(theMUONTriggerTrack.fSlopeY),
  96       floTrgNum(theMUONTriggerTrack.floTrgNum),
  97       fGTPattern(theMUONTriggerTrack.fGTPattern),
  98       fPtCutLevel(theMUONTriggerTrack.fPtCutLevel),
  99       fHitsPatternInTrigCh(theMUONTriggerTrack.fHitsPatternInTrigCh),
 100       fCovariances(0x0)
 101 {
 102 ///
 103 /// copy ctor
 104 ///
 105   if (theMUONTriggerTrack.fCovariances) fCovariances = new TMatrixD(*(theMUONTriggerTrack.fCovariances));
 106   AliDebug(5,Form("this=%p copy ctor",this));
 107
 108 }
 109
 110 //__________________________________________________________________________
 111 AliMUONTriggerTrack & AliMUONTriggerTrack::operator=(const AliMUONTriggerTrack&
 112 theMUONTriggerTrack)
 113 {
 114 /// Assignment operator
 115
 116     // check assignement to self
 117     if (this == &theMUONTriggerTrack)
 118         return *this;
 119
 120     /// base class assignement
 121     TObject::operator=(theMUONTriggerTrack);
 122
 123     fx11 = theMUONTriggerTrack.fx11;
 124     fy11 = theMUONTriggerTrack.fy11;
 125     fz11 = theMUONTriggerTrack.fz11;
 126     fz21 = theMUONTriggerTrack.fz21;
 127     fSlopeX = theMUONTriggerTrack.fSlopeX;
 128     fSlopeY = theMUONTriggerTrack.fSlopeY;
 129     floTrgNum = theMUONTriggerTrack.floTrgNum;
 130     fGTPattern = theMUONTriggerTrack.fGTPattern;
 131     fHitsPatternInTrigCh = theMUONTriggerTrack.fHitsPatternInTrigCh;
 132
 133     if (theMUONTriggerTrack.fCovariances) {
 134       if (fCovariances) *fCovariances = *(theMUONTriggerTrack.fCovariances);
 135       else fCovariances = new TMatrixD(*(theMUONTriggerTrack.fCovariances));
 136     } else {
 137       delete fCovariances;
 138       fCovariances = 0x0;
 139     }
 140
 141     return *this;
 142 }
 143
 144 //__________________________________________________________________________
 145 void
 146 AliMUONTriggerTrack::Print(Option_t* opt) const
 147 {
 148 /// Printing
 149   TString optString(opt);
 150   optString.ToUpper();
 151   if ( optString.Contains("FULL") ) optString = "PARAM COV";
 152
 153   if ( optString.Contains("PARAM"))
 154     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",
 155                  fx11,fy11,fz11,fz21,fSlopeX,fSlopeY,floTrgNum,fGTPattern,fHitsPatternInTrigCh) << endl;
 156
 157   if ( optString.Contains("COV") ){
 158     if ( ! fCovariances ) cout << "Covariances not initialized " << endl;
 159     else fCovariances->Print();
 160   }
 161 }
 162
 163 //__________________________________________________________________________
 164 void AliMUONTriggerTrack::SetCovariances(const TMatrixD& covariances)
 165 {
 166   /// Set the covariance matrix
 167   if (fCovariances) *fCovariances = covariances;
 168   else fCovariances = new TMatrixD(covariances);
 169 }
 170
 171 //__________________________________________________________________________
 172 void AliMUONTriggerTrack::SetCovariances(const Double_t matrix[3][3])
 173 {
 174   /// Set the covariance matrix
 175   if (fCovariances) fCovariances->SetMatrixArray(&(matrix[0][0]));
 176   else fCovariances = new TMatrixD(3,3,&(matrix[0][0]));
 177 }
 178
 179 //__________________________________________________________________________
 180 const TMatrixD& AliMUONTriggerTrack::GetCovariances() const
 181 {
 182   /// Return the covariance matrix (create it before if needed)
 183   if (!fCovariances) {
 184     fCovariances = new TMatrixD(3,3);
 185     fCovariances->Zero();
 186   }
 187   return *fCovariances;
 188 }
 189
 190 //__________________________________________________________________________
 191 Bool_t AliMUONTriggerTrack::Match(AliMUONTriggerTrack &track,
 192                                   Double_t sigmaCut) const
 193 {
 194   /// Try to match this track with the given track. Matching conditions:
 195   /// - x, y position and y slope within sigmaCut
 196
 197   // Find the track with the covariances correctly set
 198   // Extrapolate to the z of the other track
 199   Bool_t hasCov1 = ( GetCovariances().NonZeros() != 0 );
 200   Bool_t hasCov2 = ( track.GetCovariances().NonZeros() != 0 );
 201
 202   const AliMUONTriggerTrack* trackToExtrap = ( hasCov2 ) ? &track : this;
 203   const AliMUONTriggerTrack* fixedTrack = ( hasCov2 ) ? this : &track;
 204
 205   TMatrixD paramDiff(3,1);
 206   Double_t deltaZ = fixedTrack->GetZ11() - trackToExtrap->GetZ11();
 207   paramDiff(0,0) = fixedTrack->GetX11() - trackToExtrap->GetX11();
 208   paramDiff(1,0) = fixedTrack->GetY11() - ( trackToExtrap->GetY11() + trackToExtrap->GetSlopeY() * deltaZ );
 209   paramDiff(2,0) = fixedTrack->GetSlopeY() - trackToExtrap->GetSlopeY();
 210   Double_t chi2 = 0.;
 211
 212   TMatrixD cov1(fixedTrack->GetCovariances());
 213   TMatrixD cov2(trackToExtrap->GetCovariances());
 214
 215   // Extrapolate covariances to z
 216   if ( deltaZ != 0 ) {
 217     if ( hasCov1 || hasCov2 ){
 218       TMatrixD jacob(3,3);
 219       jacob.UnitMatrix();
 220       jacob(1,2) = deltaZ;
 221       TMatrixD tmp(trackToExtrap->GetCovariances(),TMatrixD::kMultTranspose,jacob);
 222       TMatrixD tmp2(jacob,TMatrixD::kMult,tmp);
 223       cov2 = tmp2;
 224     }
 225   }
 226
 227   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()));
 228
 229   TMatrixD sumCov(cov1,TMatrixD::kPlus,cov2);
 230   if (sumCov.Determinant() != 0) {
 231     sumCov.Invert();
 232     TMatrixD tmp(sumCov,TMatrixD::kMult,paramDiff);
 233     TMatrixD chi2M(paramDiff,TMatrixD::kTransposeMult,tmp);
 234     chi2 = chi2M(0,0);
 235   } else {
 236     AliWarning(" Determinant = 0");
 237     Double_t sigma2 = 0.;
 238     for (Int_t iVar = 0; iVar < 3; iVar++) {
 239       sigma2 = cov1(iVar,iVar) + cov2(iVar,iVar);
 240       chi2 += paramDiff(iVar,0) * paramDiff(iVar,0) / sigma2;
 241     }
 242   }
 243
 244   if ( chi2/3 > sigmaCut * sigmaCut )
 245     return kFALSE;
 246
 247   return kTRUE;
 248 }