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a9e2aefa | 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 | ||
88cb7938 | 16 | /* $Id$ */ |
a9e2aefa | 17 | |
18 | //__________________________________________________________________________ | |
19 | // | |
20 | // Hit for reconstruction in ALICE dimuon spectrometer | |
21 | //__________________________________________________________________________ | |
22 | ||
23 | #include "AliMUONHitForRec.h" | |
24 | #include "AliMUONTrackParam.h" | |
25 | #include "AliMUONRawCluster.h" | |
26 | #include "AliMUONHit.h" | |
27 | ||
28 | ClassImp(AliMUONHitForRec) // Class implementation in ROOT context | |
29 | ||
30 | //__________________________________________________________________________ | |
31 | AliMUONHitForRec::AliMUONHitForRec(AliMUONHit* Ghit) | |
32 | { | |
33 | // Constructor for AliMUONHitForRec from a GEANT hit. | |
34 | // Fills the bending, non bending, and Z coordinates, | |
35 | // which are taken from the coordinates of the GEANT hit, | |
36 | // the track number (GEANT and not TH), | |
37 | // and the chamber number (0...). | |
94de3818 | 38 | fBendingCoor = Ghit->Y(); |
39 | fNonBendingCoor = Ghit->X(); | |
40 | fZ = Ghit->Z(); | |
a9e2aefa | 41 | // fTrack = Ghit->fTrack; ????????? |
e819fbd3 | 42 | fChamberNumber = Ghit->Chamber() - 1; |
a9e2aefa | 43 | // other fields will be updated in |
44 | // AliMUONEventReconstructor::NewHitForRecFromGEANT, | |
45 | // except the following ones | |
46 | fIndexOfFirstSegment = -1; | |
47 | fNSegments = 0; | |
48 | fFirstTrackHitPtr = fLastTrackHitPtr = NULL; | |
49 | fNTrackHits = 0; | |
50 | return; | |
51 | } | |
52 | ||
53 | // //__________________________________________________________________________ | |
54 | // AliMUONHitForRec::AliMUONHitForRec(AliMUONReconstHit* CathCorrel) | |
55 | // { | |
56 | // // Constructor for AliMUONHitForRec from a (cathode correlated) raw cluster. | |
57 | // // Fills the bending and non bending coordinates. | |
58 | // // Only the first correlation is taken into account. | |
59 | // // The bending coordinate is taken from the first cathode. | |
60 | // // The non bending coordinate is taken | |
61 | // // from the second cathode if it exists, | |
62 | // // from the first one otherwise. | |
63 | // fBendingCoor = CathCorrel->fY[3]; | |
64 | // if (CathCorrel->fCorrelIndex[0] >= 0) fNonBendingCoor = CathCorrel->fX[0]; | |
65 | // else fNonBendingCoor = CathCorrel->fX[3]; | |
66 | // return; | |
67 | // } | |
68 | ||
69 | //__________________________________________________________________________ | |
70 | AliMUONHitForRec::AliMUONHitForRec(AliMUONRawCluster* RawCluster) | |
71 | { | |
72 | // Constructor for AliMUONHitForRec from a raw cluster. | |
73 | // Fills the bending and non bending coordinates. | |
74 | fNonBendingCoor = RawCluster->fX[0]; | |
75 | fBendingCoor = RawCluster->fY[0]; | |
76 | // other fields will be updated in | |
77 | // AliMUONEventReconstructor::AddHitsForRecFromRawClusters, | |
78 | // except the following ones | |
79 | fTHTrack = -1; | |
80 | fGeantSignal = -1; | |
81 | fIndexOfFirstSegment = -1; | |
82 | fNSegments = 0; | |
83 | fFirstTrackHitPtr = fLastTrackHitPtr = NULL; | |
84 | fNTrackHits = 0; | |
85 | return; | |
86 | } | |
87 | ||
d9a3473d | 88 | AliMUONHitForRec::AliMUONHitForRec (const AliMUONHitForRec& MUONHitForRec):TObject(MUONHitForRec) |
a9e2aefa | 89 | { |
90 | // Dummy copy constructor | |
91 | } | |
92 | ||
d9a3473d | 93 | AliMUONHitForRec & AliMUONHitForRec::operator=(const AliMUONHitForRec& /*MUONHitForRec*/) |
a9e2aefa | 94 | { |
95 | // Dummy assignment operator | |
96 | return *this; | |
97 | } | |
a9e2aefa | 98 | //__________________________________________________________________________ |
83dbc640 | 99 | /*AZ |
2a941f4e | 100 | Int_t AliMUONHitForRec::Compare(const TObject* Hit) const |
a9e2aefa | 101 | { |
102 | // "Compare" function to sort with increasing chamber number. | |
103 | // Returns -1 (0, +1) if ChamberNumber of current HitForRec | |
104 | // is smaller than (equal to, larger than) ChamberNumber of Hit | |
105 | if (fChamberNumber < ((AliMUONHitForRec*)Hit)->fChamberNumber) return(-1); | |
106 | else if (fChamberNumber == ((AliMUONHitForRec*)Hit)->fChamberNumber) return( 0); | |
107 | else return(+1); | |
108 | } | |
83dbc640 | 109 | */ |
110 | //__________________________________________________________________________ | |
111 | Int_t AliMUONHitForRec::Compare(const TObject* Hit) const | |
112 | { | |
113 | // "Compare" function to sort with increasing Z-coordinate. | |
114 | // Returns -1 (0, +1) if Z-coordinate of current HitForRec | |
115 | // is smaller than (equal to, larger than) Z-coordinate of Hit | |
116 | if (fZ < ((AliMUONHitForRec*)Hit)->fZ) return(-1); | |
117 | else if (fZ == ((AliMUONHitForRec*)Hit)->fZ) return( 0); | |
118 | else return(+1); | |
119 | } | |
a9e2aefa | 120 | |
121 | //__________________________________________________________________________ | |
122 | Double_t AliMUONHitForRec::NormalizedChi2WithHitForRec(AliMUONHitForRec* HitForRec, Double_t Sigma2Cut) | |
123 | { | |
124 | // Calculate the normalized Chi2 between the current HitForRec (this) | |
125 | // and the HitForRec pointed to by "HitForRec", | |
126 | // i.e. the square deviations between the coordinates, | |
127 | // in both the bending and the non bending plane, | |
128 | // divided by the variance of the same quantities and by "Sigma2Cut". | |
129 | // Returns 3 if none of the 2 quantities is OK, | |
130 | // something smaller than or equal to 2 otherwise. | |
131 | // Would it be more correct to use a real chi square | |
132 | // including the non diagonal term ???? | |
133 | Double_t chi2, chi2Max, diff, normDiff; | |
134 | chi2 = 0.0; | |
135 | chi2Max = 3.0; | |
136 | // coordinate in bending plane | |
137 | diff = this->fBendingCoor - HitForRec->fBendingCoor; | |
138 | normDiff = diff * diff / | |
139 | (this->fBendingReso2 + HitForRec->fBendingReso2) / Sigma2Cut; | |
140 | if (normDiff > 1.0) return chi2Max; | |
141 | chi2 = chi2 + normDiff; | |
142 | // coordinate in non bending plane | |
143 | diff = this->fNonBendingCoor - HitForRec->fNonBendingCoor; | |
144 | normDiff = diff * diff / | |
145 | (this->fNonBendingReso2 + HitForRec->fNonBendingReso2) / Sigma2Cut; | |
146 | if (normDiff > 1.0) return chi2Max; | |
147 | chi2 = chi2 + normDiff; | |
148 | return chi2; | |
149 | } |