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 //__________________________________________________________________________
20 // Hit for reconstruction in ALICE dimuon spectrometer
21 //__________________________________________________________________________
23 #include "AliTrackReference.h"
24 #include "AliMUONHitForRec.h"
25 #include "AliMUONRawCluster.h"
26 #include "AliMUONHit.h"
27 #include "AliMUONConstants.h"
30 ClassImp(AliMUONHitForRec) // Class implementation in ROOT context
32 //__________________________________________________________________________
33 AliMUONHitForRec::AliMUONHitForRec()
36 // Default Constructor
38 fFirstTrackHitPtr = 0;
42 //__________________________________________________________________________
43 AliMUONHitForRec::AliMUONHitForRec(AliTrackReference* theGhit)
46 // Constructor for AliMUONHitForRec from a track ref. hit.
47 // Fills the bending, non bending, and Z coordinates,
48 // which are taken from the coordinates of the track ref. hit,
49 // the track number (track ref. and not TH),
50 // and the chamber number (0...).
51 fBendingCoor = theGhit->Y();
52 fNonBendingCoor = theGhit->X();
54 // fTrack = theGhit->fTrack; ?????????
55 fChamberNumber = AliMUONConstants::ChamberNumber(fZ);
57 // other fields will be updated in
58 // AliMUONEventReconstructor::NewHitForRecFromTrackRef,
59 // except the following ones
60 fIndexOfFirstSegment = -1;
62 fFirstTrackHitPtr = fLastTrackHitPtr = NULL;
67 // //__________________________________________________________________________
68 // AliMUONHitForRec::AliMUONHitForRec(AliMUONReconstHit* CathCorrel)
70 // // Constructor for AliMUONHitForRec from a (cathode correlated) raw cluster.
71 // // Fills the bending and non bending coordinates.
72 // // Only the first correlation is taken into account.
73 // // The bending coordinate is taken from the first cathode.
74 // // The non bending coordinate is taken
75 // // from the second cathode if it exists,
76 // // from the first one otherwise.
77 // fBendingCoor = CathCorrel->fY[3];
78 // if (CathCorrel->fCorrelIndex[0] >= 0) fNonBendingCoor = CathCorrel->fX[0];
79 // else fNonBendingCoor = CathCorrel->fX[3];
83 //__________________________________________________________________________
84 AliMUONHitForRec::AliMUONHitForRec(AliMUONRawCluster* theRawCluster)
87 // Constructor for AliMUONHitForRec from a raw cluster.
88 // Fills the bending and non bending coordinates.
89 fNonBendingCoor = theRawCluster->GetX(0);
90 fBendingCoor = theRawCluster->GetY(0);
92 // other fields will be updated in
93 // AliMUONEventReconstructor::AddHitsForRecFromRawClusters,
94 // except the following ones
97 fIndexOfFirstSegment = -1;
99 fFirstTrackHitPtr = fLastTrackHitPtr = NULL;
104 //__________________________________________________________________________
105 AliMUONHitForRec::AliMUONHitForRec (const AliMUONHitForRec& theMUONHitForRec)
106 : TObject(theMUONHitForRec)
108 fBendingCoor = theMUONHitForRec.fBendingCoor;
109 fNonBendingCoor = theMUONHitForRec.fNonBendingCoor;
110 fZ = theMUONHitForRec.fZ;
111 fBendingReso2 = theMUONHitForRec.fBendingReso2;
112 fNonBendingReso2 = theMUONHitForRec.fNonBendingReso2;
113 fChamberNumber = theMUONHitForRec.fChamberNumber;
114 fDetElemId = theMUONHitForRec.fDetElemId;
115 fHitNumber = theMUONHitForRec.fHitNumber;
116 fTTRTrack = theMUONHitForRec.fTTRTrack;
117 fTrackRefSignal = theMUONHitForRec.fTrackRefSignal;
118 fIndexOfFirstSegment = theMUONHitForRec.fIndexOfFirstSegment;
119 fNSegments = theMUONHitForRec.fNSegments;
120 fFirstTrackHitPtr = theMUONHitForRec.fFirstTrackHitPtr;
121 fLastTrackHitPtr = theMUONHitForRec.fLastTrackHitPtr;
122 fNTrackHits = theMUONHitForRec.fNTrackHits;
125 //__________________________________________________________________________
126 AliMUONHitForRec & AliMUONHitForRec::operator=(const AliMUONHitForRec& theMUONHitForRec)
128 fBendingCoor = theMUONHitForRec.fBendingCoor;
129 fNonBendingCoor = theMUONHitForRec.fNonBendingCoor;
130 fZ = theMUONHitForRec.fZ;
131 fBendingReso2 = theMUONHitForRec.fBendingReso2;
132 fNonBendingReso2 = theMUONHitForRec.fNonBendingReso2;
133 fChamberNumber = theMUONHitForRec.fChamberNumber;
134 fDetElemId = theMUONHitForRec.fDetElemId;
135 fHitNumber = theMUONHitForRec.fHitNumber;
136 fTTRTrack = theMUONHitForRec.fTTRTrack;
137 fTrackRefSignal = theMUONHitForRec.fTrackRefSignal;
138 fIndexOfFirstSegment = theMUONHitForRec.fIndexOfFirstSegment;
139 fNSegments = theMUONHitForRec.fNSegments;
140 fFirstTrackHitPtr = theMUONHitForRec.fFirstTrackHitPtr;
141 fLastTrackHitPtr = theMUONHitForRec.fLastTrackHitPtr;
142 fNTrackHits = theMUONHitForRec.fNTrackHits;
145 //__________________________________________________________________________
147 Int_t AliMUONHitForRec::Compare(const TObject* Hit) const
149 // "Compare" function to sort with increasing chamber number.
150 // Returns -1 (0, +1) if ChamberNumber of current HitForRec
151 // is smaller than (equal to, larger than) ChamberNumber of Hit
152 if (fChamberNumber < ((AliMUONHitForRec*)Hit)->fChamberNumber) return(-1);
153 else if (fChamberNumber == ((AliMUONHitForRec*)Hit)->fChamberNumber) return( 0);
157 //__________________________________________________________________________
158 Int_t AliMUONHitForRec::Compare(const TObject* Hit) const
160 // "Compare" function to sort with decreasing Z-coordinate (spectro. MUON z<0).
161 // Returns 1 (0, -1) if Z-coordinate of current HitForRec
162 // is smaller than (equal to, larger than) Z-coordinate of Hit
163 if (fZ < ((AliMUONHitForRec*)Hit)->fZ) return(1);
164 else if (fZ == ((AliMUONHitForRec*)Hit)->fZ) return( 0);
168 //__________________________________________________________________________
169 Double_t AliMUONHitForRec::NormalizedChi2WithHitForRec(AliMUONHitForRec* hitForRec, Double_t Sigma2Cut) const
171 // Calculate the normalized Chi2 between the current hitForRec (this)
172 // and the hitForRec pointed to by "hitForRec",
173 // i.e. the square deviations between the coordinates,
174 // in both the bending and the non bending plane,
175 // divided by the variance of the same quantities and by "Sigma2Cut".
176 // Returns 3 if none of the 2 quantities is OK,
177 // something smaller than or equal to 2 otherwise.
178 // Would it be more correct to use a real chi square
179 // including the non diagonal term ????
180 Double_t chi2, chi2Max, diff, normDiff;
183 // coordinate in bending plane
184 diff = fBendingCoor - hitForRec->fBendingCoor;
185 normDiff = diff * diff /
186 (fBendingReso2 + hitForRec->fBendingReso2) / Sigma2Cut;
187 if (normDiff > 1.0) return chi2Max;
188 chi2 = chi2 + normDiff;
189 // coordinate in non bending plane
190 diff = fNonBendingCoor - hitForRec->fNonBendingCoor;
191 normDiff = diff * diff /
192 (fNonBendingReso2 + hitForRec->fNonBendingReso2) / Sigma2Cut;
193 if (normDiff > 1.0) return chi2Max;
194 chi2 = chi2 + normDiff;