]>
Commit | Line | Data |
---|---|---|
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 "AliITSRecoParam.h" | |
30 | #include "AliCluster.h" | |
31 | #include "AliESDtrack.h" | |
32 | #include "AliITSgeomTGeo.h" | |
33 | #include "AliITStrackMI.h" | |
34 | ||
35 | ClassImp(AliITStrackMI) | |
36 | ||
37 | const Int_t kWARN=5; | |
38 | ||
39 | //____________________________________________________________________________ | |
40 | AliITStrackMI::AliITStrackMI():AliITStrackV2(), | |
41 | fNUsed(0), | |
42 | fNSkipped(0), | |
43 | fNDeadZone(0), | |
44 | fReconstructed(kFALSE), | |
45 | fExpQ(40), | |
46 | fChi22(0), | |
47 | fdEdxMismatch(0), | |
48 | fConstrain(kFALSE), | |
49 | fWinner(0), | |
50 | fGoldV0(kFALSE) | |
51 | ||
52 | { | |
53 | //constructor | |
54 | for(Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fClIndex[i]=-1; | |
55 | for(Int_t i=0; i<6; i++) { fNy[i]=0; fNz[i]=0; fNormQ[i]=0; fNormChi2[i]=1000; fDeadZoneProbability[i]=0;} | |
56 | 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;} | |
57 | fD[0]=0; fD[1]=0; | |
58 | fDnorm[0]=0; fDnorm[1]=0; | |
59 | } | |
60 | ||
61 | //____________________________________________________________________________ | |
62 | AliITStrackMI::AliITStrackMI(AliESDtrack& t,Bool_t c): | |
63 | AliITStrackV2(t,c), | |
64 | fNUsed(0), | |
65 | fNSkipped(0), | |
66 | fNDeadZone(0), | |
67 | fReconstructed(kFALSE), | |
68 | fExpQ(40), | |
69 | fChi22(0), | |
70 | fdEdxMismatch(0), | |
71 | fConstrain(kFALSE), | |
72 | fWinner(0), | |
73 | fGoldV0(kFALSE) { | |
74 | //------------------------------------------------------------------ | |
75 | // Conversion ESD track -> ITS track. | |
76 | // If c==kTRUE, create the ITS track out of the constrained params. | |
77 | //------------------------------------------------------------------ | |
78 | 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;} | |
79 | 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;} | |
80 | fD[0]=0; fD[1]=0; | |
81 | fDnorm[0]=0; fDnorm[1]=0; | |
82 | ||
83 | } | |
84 | ||
85 | //____________________________________________________________________________ | |
86 | AliITStrackMI::AliITStrackMI(const AliITStrackMI& t) : AliITStrackV2(t), | |
87 | fNUsed(t.fNUsed), | |
88 | fNSkipped(t.fNSkipped), | |
89 | fNDeadZone(t.fNDeadZone), | |
90 | fReconstructed(t.fReconstructed), | |
91 | fExpQ(t.fExpQ), | |
92 | fChi22(t.fChi22), | |
93 | fdEdxMismatch(t.fdEdxMismatch), | |
94 | fConstrain(t.fConstrain), | |
95 | fWinner(0), | |
96 | fGoldV0(t.fGoldV0) { | |
97 | //------------------------------------------------------------------ | |
98 | //Copy constructor | |
99 | //------------------------------------------------------------------ | |
100 | fLab = t.fLab; | |
101 | fFakeRatio = t.fFakeRatio; | |
102 | ||
103 | fD[0]=t.fD[0]; fD[1]=t.fD[1]; | |
104 | fDnorm[0] = t.fDnorm[0]; fDnorm[1]=t.fDnorm[1]; | |
105 | for(Int_t i=0; i<6; i++) { | |
106 | 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]; | |
107 | } | |
108 | for(Int_t i=0; i<12; i++) {fDy[i]=t.fDy[i]; fDz[i]=t.fDz[i]; | |
109 | fSigmaY[i]=t.fSigmaY[i]; fSigmaZ[i]=t.fSigmaZ[i]; fSigmaYZ[i]=t.fSigmaYZ[i]; fChi2MIP[i]=t.fChi2MIP[i];} | |
110 | //memcpy(fDy,t.fDy,6*sizeof(Float_t)); | |
111 | //memcpy(fDz,t.fDz,6*sizeof(Float_t)); | |
112 | //memcpy(fSigmaY,t.fSigmaY,6*sizeof(Float_t)); | |
113 | //memcpy(fSigmaZ,t.fSigmaZ,6*sizeof(Float_t)); | |
114 | //memcpy(fChi2MIP,t.fChi2MIP,12*sizeof(Float_t)); | |
115 | } | |
116 | ||
117 | //_____________________________________________________________________________ | |
118 | Int_t AliITStrackMI::Compare(const TObject *o) const { | |
119 | //----------------------------------------------------------------- | |
120 | // This function compares tracks according to the their curvature | |
121 | //----------------------------------------------------------------- | |
122 | AliITStrackMI *t=(AliITStrackMI*)o; | |
123 | //Double_t co=TMath::Abs(t->Get1Pt()); | |
124 | //Double_t c =TMath::Abs(Get1Pt()); | |
125 | 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])); | |
126 | Double_t c =GetSigmaY2()*GetSigmaZ2()*(0.5+TMath::Sqrt(0.5*fD[0]*fD[0]+fD[1]*fD[1])); | |
127 | if (c>co) return 1; | |
128 | else if (c<co) return -1; | |
129 | return 0; | |
130 | } | |
131 | ||
132 | ||
133 | Double_t AliITStrackMI::GetPredictedChi2MI(Double_t cy, Double_t cz, Double_t cerry, Double_t cerrz, Double_t covyz) const | |
134 | { | |
135 | //----------------------------------------------------------------- | |
136 | // This function calculates a predicted chi2 increment. | |
137 | //----------------------------------------------------------------- | |
138 | Double_t p[2]={cy, cz}; | |
139 | Double_t cov[3]={cerry*cerry, covyz, cerrz*cerrz}; | |
140 | return AliExternalTrackParam::GetPredictedChi2(p,cov); | |
141 | } | |
142 | ||
143 | //____________________________________________________________________________ | |
144 | Bool_t AliITStrackMI::UpdateMI(const AliCluster *c, Double_t chi2, Int_t index) { | |
145 | //------------------------------------------------------------------ | |
146 | //This function updates track parameters | |
147 | //------------------------------------------------------------------ | |
148 | Double_t dy=c->GetY() - GetY(), dz=c->GetZ() - GetZ(); | |
149 | Int_t layer = (index & 0xf0000000) >> 28; | |
150 | fDy[layer] = dy; | |
151 | fDz[layer] = dz; | |
152 | fSigmaY[layer] = TMath::Sqrt(c->GetSigmaY2()+GetSigmaY2()); | |
153 | fSigmaZ[layer] = TMath::Sqrt(c->GetSigmaZ2()+GetSigmaZ2()); | |
154 | fSigmaYZ[layer] = c->GetSigmaYZ()+GetSigmaZY(); | |
155 | ||
156 | ||
157 | return Update(c,chi2,index); | |
158 | } | |
159 | ||
160 | Int_t AliITStrackMI::GetProlongationFast(Double_t alp, Double_t xk,Double_t &y, Double_t &z) | |
161 | { | |
162 | //----------------------------------------------------------------------------- | |
163 | //get fast prolongation | |
164 | //----------------------------------------------------------------------------- | |
165 | Double_t ca=TMath::Cos(alp-GetAlpha()), sa=TMath::Sin(alp-GetAlpha()); | |
166 | Double_t cf=TMath::Sqrt((1.-GetSnp())*(1.+GetSnp())); | |
167 | // **** rotation ********************** | |
168 | y= -GetX()*sa + GetY()*ca; | |
169 | // **** translation ****************** | |
170 | Double_t dx = xk- GetX()*ca - GetY()*sa; | |
171 | Double_t f1=GetSnp()*ca - cf*sa, f2=f1 + GetC()*dx; | |
172 | if (TMath::Abs(f2) >= 0.9999) { | |
173 | return 0; | |
174 | } | |
175 | Double_t r1=TMath::Sqrt((1.-f1)*(1.+f1)), r2=TMath::Sqrt((1.-f2)*(1.+f2)); | |
176 | y += dx*(f1+f2)/(r1+r2); | |
177 | z = GetZ()+dx*(f1+f2)/(f1*r2 + f2*r1)*GetTgl(); | |
178 | return 1; | |
179 | } | |
180 | ||
181 | ||
182 | Bool_t AliITStrackMI::IsGoldPrimary() | |
183 | { | |
184 | // | |
185 | // Indicates gold pimary track | |
186 | // | |
187 | Bool_t isGold=kTRUE; | |
188 | if (!fConstrain) return kFALSE; // | |
189 | if (fNDeadZone+fNDeadZone<5.5) isGold = kFALSE; // short track | |
190 | // | |
191 | if (fChi2MIP[0]*fChi2MIP[3]>2) isGold = kFALSE; // RS: cut on chi2*interpolated_chi2 | |
192 | if (fChi2/Float_t(fN)>2.){ | |
193 | if (fChi2MIP[0]+fNUsed>3.5) isGold = kFALSE; | |
194 | } | |
195 | if (fChi2MIP[2]>4.5) isGold = kFALSE; //back propagation chi2 | |
196 | // | |
197 | if (fDnorm[0]>0&&fDnorm[1]>0){ | |
198 | const Float_t distcut2 =2.5*2.5; //normalize distance cut | |
199 | 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) | |
200 | if (dist2>distcut2) isGold = kFALSE; | |
201 | } | |
202 | return isGold; | |
203 | } |