1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 ///////////////////////////////////////////////////
26 ///////////////////////////////////////////////////
28 #include <Riostream.h>
32 #include "AliMUONTrackParam.h"
33 #include "AliESDMuonTrack.h"
35 #include "AliMUONHitForRec.h"
38 ClassImp(AliMUONTrackParam) // Class implementation in ROOT context
41 //_________________________________________________________________________
42 AliMUONTrackParam::AliMUONTrackParam()
48 fInverseBendingMomentum(0.),
56 //_________________________________________________________________________
57 AliMUONTrackParam::AliMUONTrackParam(const AliMUONTrackParam& theMUONTrackParam)
58 : TObject(theMUONTrackParam),
59 fNonBendingCoor(theMUONTrackParam.fNonBendingCoor),
60 fNonBendingSlope(theMUONTrackParam.fNonBendingSlope),
61 fBendingCoor(theMUONTrackParam.fBendingCoor),
62 fBendingSlope(theMUONTrackParam.fBendingSlope),
63 fInverseBendingMomentum(theMUONTrackParam.fInverseBendingMomentum),
64 fZ(theMUONTrackParam.fZ),
66 fHitForRecPtr(theMUONTrackParam.fHitForRecPtr)
69 if (theMUONTrackParam.fCovariances) fCovariances = new TMatrixD(*(theMUONTrackParam.fCovariances));
72 //_________________________________________________________________________
73 AliMUONTrackParam& AliMUONTrackParam::operator=(const AliMUONTrackParam& theMUONTrackParam)
75 /// Asignment operator
76 if (this == &theMUONTrackParam)
79 // base class assignement
80 TObject::operator=(theMUONTrackParam);
82 fNonBendingCoor = theMUONTrackParam.fNonBendingCoor;
83 fNonBendingSlope = theMUONTrackParam.fNonBendingSlope;
84 fBendingCoor = theMUONTrackParam.fBendingCoor;
85 fBendingSlope = theMUONTrackParam.fBendingSlope;
86 fInverseBendingMomentum = theMUONTrackParam.fInverseBendingMomentum;
87 fZ = theMUONTrackParam.fZ;
89 if (theMUONTrackParam.fCovariances) {
90 if (fCovariances) *fCovariances = *(theMUONTrackParam.fCovariances);
91 else fCovariances = new TMatrixD(*(theMUONTrackParam.fCovariances));
92 } else if (fCovariances) {
100 //__________________________________________________________________________
101 AliMUONTrackParam::~AliMUONTrackParam()
107 //__________________________________________________________________________
108 void AliMUONTrackParam::SetTrackParam(AliMUONTrackParam& theMUONTrackParam)
110 /// Set track parameters from "TrackParam" leaving pointer to fHitForRecPtr and parameter covariances unchanged
111 fNonBendingCoor = theMUONTrackParam.fNonBendingCoor;
112 fNonBendingSlope = theMUONTrackParam.fNonBendingSlope;
113 fBendingCoor = theMUONTrackParam.fBendingCoor;
114 fBendingSlope = theMUONTrackParam.fBendingSlope;
115 fInverseBendingMomentum = theMUONTrackParam.fInverseBendingMomentum;
116 fZ = theMUONTrackParam.fZ;
119 //__________________________________________________________________________
120 AliMUONHitForRec* AliMUONTrackParam::GetHitForRecPtr(void) const
122 /// return pointer to HitForRec attached to the current TrackParam
123 /// this method should not be called when fHitForRecPtr == NULL
124 if (!fHitForRecPtr) AliWarning("fHitForRecPtr == NULL");
125 return fHitForRecPtr;
128 //_________________________________________________________________________
129 void AliMUONTrackParam::GetParamFrom(const AliESDMuonTrack& esdMuonTrack)
131 /// assigned value form ESD track.
132 fInverseBendingMomentum = esdMuonTrack.GetInverseBendingMomentum();
133 fBendingSlope = TMath::Tan(esdMuonTrack.GetThetaY());
134 fNonBendingSlope = TMath::Tan(esdMuonTrack.GetThetaX());
135 fZ = esdMuonTrack.GetZ();
136 fBendingCoor = esdMuonTrack.GetBendingCoor();
137 fNonBendingCoor = esdMuonTrack.GetNonBendingCoor();
140 //_________________________________________________________________________
141 void AliMUONTrackParam::SetParamFor(AliESDMuonTrack& esdMuonTrack)
143 /// assigned value form ESD track.
144 esdMuonTrack.SetInverseBendingMomentum(fInverseBendingMomentum);
145 esdMuonTrack.SetThetaX(TMath::ATan(fNonBendingSlope));
146 esdMuonTrack.SetThetaY(TMath::ATan(fBendingSlope));
147 esdMuonTrack.SetZ(fZ);
148 esdMuonTrack.SetBendingCoor(fBendingCoor);
149 esdMuonTrack.SetNonBendingCoor(fNonBendingCoor);
152 //__________________________________________________________________________
153 Double_t AliMUONTrackParam::Px() const
155 /// return px from track paramaters
156 Double_t pYZ, pZ, pX;
158 if ( TMath::Abs(fInverseBendingMomentum) > 0 )
159 pYZ = TMath::Abs(1.0 / fInverseBendingMomentum);
160 pZ = -pYZ / (TMath::Sqrt(1.0 + fBendingSlope * fBendingSlope)); // spectro. (z<0)
161 pX = pZ * fNonBendingSlope;
165 //__________________________________________________________________________
166 Double_t AliMUONTrackParam::Py() const
168 /// return px from track paramaters
169 Double_t pYZ, pZ, pY;
171 if ( TMath::Abs(fInverseBendingMomentum) > 0 )
172 pYZ = TMath::Abs(1.0 / fInverseBendingMomentum);
173 pZ = -pYZ / (TMath::Sqrt(1.0 + fBendingSlope * fBendingSlope)); // spectro. (z<0)
174 pY = pZ * fBendingSlope;
178 //__________________________________________________________________________
179 Double_t AliMUONTrackParam::Pz() const
181 /// return px from track paramaters
184 if ( TMath::Abs(fInverseBendingMomentum) > 0 )
185 pYZ = TMath::Abs(1.0 / fInverseBendingMomentum);
186 pZ = -pYZ / (TMath::Sqrt(1.0 + fBendingSlope * fBendingSlope)); // spectro. (z<0)
190 //__________________________________________________________________________
191 Double_t AliMUONTrackParam::P() const
193 /// return p from track paramaters
196 if ( TMath::Abs(fInverseBendingMomentum) > 0 )
197 pYZ = TMath::Abs(1.0 / fInverseBendingMomentum);
198 pZ = -pYZ / (TMath::Sqrt(1.0 + fBendingSlope * fBendingSlope)); // spectro. (z<0)
200 TMath::Sqrt(1.0 + fBendingSlope * fBendingSlope + fNonBendingSlope * fNonBendingSlope);
205 //__________________________________________________________________________
206 TMatrixD* AliMUONTrackParam::GetCovariances()
208 /// Return the covariance matrix (create it before if needed)
210 fCovariances = new TMatrixD(5,5);
216 //__________________________________________________________________________
217 void AliMUONTrackParam::SetCovariances(TMatrixD* covariances)
219 /// Set the covariance matrix
220 if (covariances == fCovariances) return; // nothing to be done
221 if (fCovariances) *fCovariances = *covariances;
222 else fCovariances = new TMatrixD(*covariances);
225 //__________________________________________________________________________
226 void AliMUONTrackParam::SetCovariances(Double_t matrix[5][5])
228 /// Set the covariance matrix
229 if (fCovariances) fCovariances->SetMatrixArray(&(matrix[0][0]));
230 else fCovariances = new TMatrixD(5,5,&(matrix[0][0]));
233 //__________________________________________________________________________
234 void AliMUONTrackParam::SetVariances(Double_t matrix[5][5])
236 /// Set the diagonal terms of the covariance matrix (variances)
237 if (!fCovariances) fCovariances = new TMatrixD(5,5);
239 for (Int_t i=0; i<5; i++) (*fCovariances)(i,i) = matrix[i][i];
242 //__________________________________________________________________________
243 void AliMUONTrackParam::DeleteCovariances()
245 /// Delete the covariance matrix
246 if (fCovariances) delete fCovariances;
250 //__________________________________________________________________________
251 void AliMUONTrackParam::EvalCovariances(AliMUONHitForRec* hit2)
253 /// Evaluate covariances assuming the track is only a straight line
254 /// between the HitForRec attached to the current TrackParam and hit2.
255 /// Nothing can be done on fInverseBendingMomentum (-> 50% err).
257 // Allocate memory if needed
258 if (!fCovariances) fCovariances = new TMatrixD(5,5);
260 // Reset the covariance matrix
263 if (!fHitForRecPtr) {
264 AliWarning("fHitForRecPtr == NULL: cannot calculate TrackParam covariances");
268 Double_t dz = fHitForRecPtr->GetZ() - hit2->GetZ();
271 (*fCovariances)(0,0) = fHitForRecPtr->GetNonBendingReso2();
272 (*fCovariances)(0,1) = fHitForRecPtr->GetNonBendingReso2() / dz;
273 (*fCovariances)(1,0) = (*fCovariances)(0,1);
274 (*fCovariances)(1,1) = ( fHitForRecPtr->GetNonBendingReso2() + hit2->GetNonBendingReso2() ) / dz / dz;
276 (*fCovariances)(2,2) = fHitForRecPtr->GetBendingReso2();
277 (*fCovariances)(2,3) = fHitForRecPtr->GetBendingReso2() / dz;
278 (*fCovariances)(3,2) = (*fCovariances)(2,3);
279 (*fCovariances)(3,3) = ( fHitForRecPtr->GetBendingReso2() + hit2->GetBendingReso2() ) / dz / dz;
280 // Inverse bending momentum
281 (*fCovariances)(4,4) = 0.5*fInverseBendingMomentum * 0.5*fInverseBendingMomentum; // error 50%
285 //__________________________________________________________________________
286 Int_t AliMUONTrackParam::Compare(const TObject* trackParam) const
288 /// "Compare" function to sort with decreasing Z (spectro. muon Z <0).
289 /// Returns 1 (0, -1) if Z of current TrackHit
290 /// is smaller than (equal to, larger than) Z of TrackHit
292 if (fHitForRecPtr->GetZ() != fZ)
293 AliWarning("track parameters are given at a different z position than the one of the corresponding hit");
295 if (fZ < ((AliMUONTrackParam*)trackParam)->GetZ()) return(1);
296 else if (fZ == ((AliMUONTrackParam*)trackParam)->GetZ()) return(0);
300 //_____________________________________________-
301 void AliMUONTrackParam::Print(Option_t* opt) const
303 /// Printing TrackParam information
304 /// "full" option for printing all the information about the TrackParam
308 if ( sopt.Contains("FULL") ) {
309 cout << "<AliMUONTrackParam> Bending P=" << setw(5) << setprecision(3) << 1./GetInverseBendingMomentum() <<
310 ", NonBendSlope=" << setw(5) << setprecision(3) << GetNonBendingSlope()*180./TMath::Pi() <<
311 ", BendSlope=" << setw(5) << setprecision(3) << GetBendingSlope()*180./TMath::Pi() <<
312 ", (x,y,z)_IP=(" << setw(5) << setprecision(3) << GetNonBendingCoor() <<
313 "," << setw(5) << setprecision(3) << GetBendingCoor() <<
314 "," << setw(5) << setprecision(3) << GetZ() <<
315 ") cm, (px,py,pz)=(" << setw(5) << setprecision(3) << Px() <<
316 "," << setw(5) << setprecision(3) << Py() <<
317 "," << setw(5) << setprecision(3) << Pz() << ") GeV/c" << endl;
320 cout << "<AliMUONTrackParam>" << endl;