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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 | //------------------------------------------------------------------------- | |
17 | // Implementation of the ITS track class | |
18 | // | |
19 | // Origin: Marian Ivanov, CERN, Marian.Ivanov@cern.ch | |
20 | // dEdx analysis by: Boris Batyunya, JINR, Boris.Batiounia@cern.ch | |
21 | //------------------------------------------------------------------------- | |
22 | ||
23 | /* $Id$ */ | |
24 | ||
25 | #include <TMatrixD.h> | |
26 | ||
27 | #include <TMath.h> | |
28 | ||
29 | #include "AliCluster.h" | |
30 | #include "AliESDtrack.h" | |
31 | #include "AliITSgeomTGeo.h" | |
32 | #include "AliITStrackMI.h" | |
33 | ||
34 | ClassImp(AliITStrackMI) | |
35 | ||
36 | const Int_t kWARN=5; | |
37 | ||
38 | //____________________________________________________________________________ | |
39 | AliITStrackMI::AliITStrackMI():AliITStrackV2(), | |
40 | fNUsed(0), | |
41 | fNSkipped(0), | |
42 | fNDeadZone(0), | |
43 | fReconstructed(kFALSE), | |
44 | fExpQ(40), | |
45 | fChi22(0), | |
46 | fdEdxMismatch(0), | |
47 | fConstrain(kFALSE), | |
48 | fGoldV0(kFALSE) | |
49 | { | |
50 | //constructor | |
51 | for(Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fClIndex[i]=-1; | |
52 | for(Int_t i=0; i<6; i++) { fNy[i]=0; fNz[i]=0; fNormQ[i]=0; fNormChi2[i]=1000; fDeadZoneProbability[i]=0;} | |
53 | for(Int_t i=0; i<12; i++) {fDy[i]=0; fDz[i]=0; fSigmaY[i]=0; fSigmaZ[i]=0; fSigmaYZ[i]=0; fChi2MIP[i]=0;} | |
54 | fD[0]=0; fD[1]=0; | |
55 | fDnorm[0]=0; fDnorm[1]=0; | |
56 | } | |
57 | ||
58 | //____________________________________________________________________________ | |
59 | AliITStrackMI::AliITStrackMI(AliESDtrack& t,Bool_t c): | |
60 | AliITStrackV2(t,c), | |
61 | fNUsed(0), | |
62 | fNSkipped(0), | |
63 | fNDeadZone(0), | |
64 | fReconstructed(kFALSE), | |
65 | fExpQ(40), | |
66 | fChi22(0), | |
67 | fdEdxMismatch(0), | |
68 | fConstrain(kFALSE), | |
69 | fGoldV0(kFALSE) { | |
70 | //------------------------------------------------------------------ | |
71 | // Conversion ESD track -> ITS track. | |
72 | // If c==kTRUE, create the ITS track out of the constrained params. | |
73 | //------------------------------------------------------------------ | |
74 | for(Int_t i=0; i<6; i++) {fClIndex[i]=-1; fNy[i]=0; fNz[i]=0; fNormQ[i]=0; fNormChi2[i]=1000; fDeadZoneProbability[i]=0;} | |
75 | for(Int_t i=0; i<12; i++) {fDy[i]=0; fDz[i]=0; fSigmaY[i]=0; fSigmaZ[i]=0; fSigmaYZ[i]=0; fChi2MIP[i]=0;} | |
76 | fD[0]=0; fD[1]=0; | |
77 | fDnorm[0]=0; fDnorm[1]=0; | |
78 | ||
79 | } | |
80 | ||
81 | //____________________________________________________________________________ | |
82 | AliITStrackMI::AliITStrackMI(const AliITStrackMI& t) : AliITStrackV2(t), | |
83 | fNUsed(t.fNUsed), | |
84 | fNSkipped(t.fNSkipped), | |
85 | fNDeadZone(t.fNDeadZone), | |
86 | fReconstructed(t.fReconstructed), | |
87 | fExpQ(t.fExpQ), | |
88 | fChi22(t.fChi22), | |
89 | fdEdxMismatch(t.fdEdxMismatch), | |
90 | fConstrain(t.fConstrain), | |
91 | fGoldV0(t.fGoldV0) { | |
92 | //------------------------------------------------------------------ | |
93 | //Copy constructor | |
94 | //------------------------------------------------------------------ | |
95 | fLab = t.fLab; | |
96 | fFakeRatio = t.fFakeRatio; | |
97 | ||
98 | fD[0]=t.fD[0]; fD[1]=t.fD[1]; | |
99 | fDnorm[0] = t.fDnorm[0]; fDnorm[1]=t.fDnorm[1]; | |
100 | for(Int_t i=0; i<6; i++) { | |
101 | fClIndex[i]= t.fClIndex[i]; fNy[i]=t.fNy[i]; fNz[i]=t.fNz[i]; fNormQ[i]=t.fNormQ[i]; fNormChi2[i] = t.fNormChi2[i]; fDeadZoneProbability[i]=t.fDeadZoneProbability[i]; | |
102 | } | |
103 | for(Int_t i=0; i<12; i++) {fDy[i]=t.fDy[i]; fDz[i]=t.fDz[i]; | |
104 | fSigmaY[i]=t.fSigmaY[i]; fSigmaZ[i]=t.fSigmaZ[i]; fSigmaYZ[i]=t.fSigmaYZ[i]; fChi2MIP[i]=t.fChi2MIP[i];} | |
105 | //memcpy(fDy,t.fDy,6*sizeof(Float_t)); | |
106 | //memcpy(fDz,t.fDz,6*sizeof(Float_t)); | |
107 | //memcpy(fSigmaY,t.fSigmaY,6*sizeof(Float_t)); | |
108 | //memcpy(fSigmaZ,t.fSigmaZ,6*sizeof(Float_t)); | |
109 | //memcpy(fChi2MIP,t.fChi2MIP,12*sizeof(Float_t)); | |
110 | } | |
111 | ||
112 | //_____________________________________________________________________________ | |
113 | Int_t AliITStrackMI::Compare(const TObject *o) const { | |
114 | //----------------------------------------------------------------- | |
115 | // This function compares tracks according to the their curvature | |
116 | //----------------------------------------------------------------- | |
117 | AliITStrackMI *t=(AliITStrackMI*)o; | |
118 | //Double_t co=TMath::Abs(t->Get1Pt()); | |
119 | //Double_t c =TMath::Abs(Get1Pt()); | |
120 | Double_t co=t->GetSigmaY2()*t->GetSigmaZ2()*(0.5+TMath::Sqrt(0.5*t->fD[0]*t->fD[0]+t->fD[1]*t->fD[1])); | |
121 | Double_t c =GetSigmaY2()*GetSigmaZ2()*(0.5+TMath::Sqrt(0.5*fD[0]*fD[0]+fD[1]*fD[1])); | |
122 | if (c>co) return 1; | |
123 | else if (c<co) return -1; | |
124 | return 0; | |
125 | } | |
126 | ||
127 | ||
128 | Double_t AliITStrackMI::GetPredictedChi2MI(Double_t cy, Double_t cz, Double_t cerry, Double_t cerrz, Double_t covyz) const | |
129 | { | |
130 | //----------------------------------------------------------------- | |
131 | // This function calculates a predicted chi2 increment. | |
132 | //----------------------------------------------------------------- | |
133 | Double_t p[2]={cy, cz}; | |
134 | Double_t cov[3]={cerry*cerry, covyz, cerrz*cerrz}; | |
135 | return AliExternalTrackParam::GetPredictedChi2(p,cov); | |
136 | } | |
137 | ||
138 | //____________________________________________________________________________ | |
139 | Bool_t AliITStrackMI::UpdateMI(const AliCluster *c, Double_t chi2, Int_t index) { | |
140 | //------------------------------------------------------------------ | |
141 | //This function updates track parameters | |
142 | //------------------------------------------------------------------ | |
143 | Double_t dy=c->GetY() - GetY(), dz=c->GetZ() - GetZ(); | |
144 | Int_t layer = (index & 0xf0000000) >> 28; | |
145 | fDy[layer] = dy; | |
146 | fDz[layer] = dz; | |
147 | fSigmaY[layer] = TMath::Sqrt(c->GetSigmaY2()+GetSigmaY2()); | |
148 | fSigmaZ[layer] = TMath::Sqrt(c->GetSigmaZ2()+GetSigmaZ2()); | |
149 | fSigmaYZ[layer] = c->GetSigmaYZ()+GetSigmaZY(); | |
150 | ||
151 | ||
152 | return Update(c,chi2,index); | |
153 | } | |
154 | ||
155 | Int_t AliITStrackMI::GetProlongationFast(Double_t alp, Double_t xk,Double_t &y, Double_t &z) | |
156 | { | |
157 | //----------------------------------------------------------------------------- | |
158 | //get fast prolongation | |
159 | //----------------------------------------------------------------------------- | |
160 | Double_t ca=TMath::Cos(alp-GetAlpha()), sa=TMath::Sin(alp-GetAlpha()); | |
161 | Double_t cf=TMath::Sqrt((1.-GetSnp())*(1.+GetSnp())); | |
162 | // **** rotation ********************** | |
163 | y= -GetX()*sa + GetY()*ca; | |
164 | // **** translation ****************** | |
165 | Double_t dx = xk- GetX()*ca - GetY()*sa; | |
166 | Double_t f1=GetSnp()*ca - cf*sa, f2=f1 + GetC()*dx; | |
167 | if (TMath::Abs(f2) >= 0.9999) { | |
168 | return 0; | |
169 | } | |
170 | Double_t r1=TMath::Sqrt((1.-f1)*(1.+f1)), r2=TMath::Sqrt((1.-f2)*(1.+f2)); | |
171 | y += dx*(f1+f2)/(r1+r2); | |
172 | z = GetZ()+dx*(f1+f2)/(f1*r2 + f2*r1)*GetTgl(); | |
173 | return 1; | |
174 | } | |
175 | ||
176 | ||
177 | Bool_t AliITStrackMI::IsGoldPrimary() | |
178 | { | |
179 | // | |
180 | // Indicates gold pimary track | |
181 | // | |
182 | Bool_t isGold=kTRUE; | |
183 | if (!fConstrain) return kFALSE; // | |
184 | if (fNDeadZone+fNDeadZone<5.5) isGold = kFALSE; // short track | |
185 | // | |
186 | if (fChi2/Float_t(fN)>2.){ | |
187 | if (fChi2MIP[0]+fNUsed>3.5) isGold = kFALSE; | |
188 | } | |
189 | if (fChi2MIP[2]>4.5) isGold = kFALSE; //back propagation chi2 | |
190 | // | |
191 | if (fDnorm[0]>0&&fDnorm[1]>0){ | |
192 | const Float_t distcut2 =2.5*2.5; //normalize distance cut | |
193 | Float_t dist2 = fD[0]*fD[0]/(fDnorm[0]*fDnorm[0])+fD[1]*fD[1]/(fDnorm[1]*fDnorm[1]); //normalize distance to the vertex (pools) | |
194 | if (dist2>distcut2) isGold = kFALSE; | |
195 | } | |
196 | return isGold; | |
197 | } |