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15dd636f | 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 | #include <TMatrixD.h> | |
24 | ||
25 | #include <TMath.h> | |
26 | ||
27 | #include "AliCluster.h" | |
28 | #include "AliESDtrack.h" | |
29 | #include "AliITStrackMI.h" | |
30 | ||
31 | ClassImp(AliITStrackMI) | |
32 | ||
33 | const Int_t kWARN=5; | |
34 | ||
35 | //____________________________________________________________________________ | |
36 | AliITStrackMI::AliITStrackMI():AliITStrackV2(), | |
37 | fNUsed(0), | |
38 | fNSkipped(0), | |
39 | fNDeadZone(0), | |
40 | fDeadZoneProbability(0), | |
41 | fReconstructed(kFALSE), | |
42 | fConstrain(kFALSE) | |
43 | { | |
44 | for(Int_t i=0; i<kMaxLayer; i++) fClIndex[i]=-1; | |
45 | for(Int_t i=0; i<6; i++) { fNy[i]=0; fNz[i]=0; fNormQ[i]=0; fNormChi2[i]=1000;} | |
46 | for(Int_t i=0; i<12; i++) {fDy[i]=0; fDz[i]=0; fSigmaY[i]=0; fSigmaZ[i]=0; fChi2MIP[i]=0;} | |
47 | fD[0]=0; fD[1]=0; | |
48 | fExpQ=40; | |
49 | fdEdxMismatch=0; | |
50 | fChi22=0; | |
628e7bb0 | 51 | fGoldV0 = kFALSE; |
15dd636f | 52 | } |
53 | ||
54 | //____________________________________________________________________________ | |
55 | AliITStrackMI::AliITStrackMI(AliESDtrack& t,Bool_t c) throw (const Char_t *) : | |
56 | AliITStrackV2(t,c) { | |
57 | //------------------------------------------------------------------ | |
58 | // Conversion ESD track -> ITS track. | |
59 | // If c==kTRUE, create the ITS track out of the constrained params. | |
60 | //------------------------------------------------------------------ | |
61 | fNUsed = 0; | |
62 | fReconstructed = kFALSE; | |
63 | fNSkipped =0; | |
64 | fNDeadZone = 0; | |
65 | fDeadZoneProbability = 0; | |
66 | for(Int_t i=0; i<6; i++) {fClIndex[i]=-1; fNy[i]=0; fNz[i]=0; fNormQ[i]=0; fNormChi2[i]=1000;} | |
67 | for(Int_t i=0; i<12; i++) {fDy[i]=0; fDz[i]=0; fSigmaY[i]=0; fSigmaZ[i]=0;fChi2MIP[i]=0;} | |
68 | fD[0]=0; fD[1]=0; | |
69 | fExpQ=40; | |
70 | fConstrain = kFALSE; | |
71 | fdEdxMismatch=0; | |
72 | fChi22 =0; | |
628e7bb0 | 73 | fGoldV0 = kFALSE; |
15dd636f | 74 | //if (!Invariant()) throw "AliITStrackV2: conversion failed !\n"; |
75 | ||
76 | } | |
77 | ||
78 | void AliITStrackMI::UpdateESDtrack(ULong_t flags) { | |
79 | fESDtrack->UpdateTrackParams(this,flags); | |
80 | if (flags == AliESDtrack::kITSin) fESDtrack->SetITSChi2MIP(fChi2MIP); | |
81 | } | |
82 | ||
83 | //____________________________________________________________________________ | |
84 | AliITStrackMI::AliITStrackMI(const AliITStrackMI& t) : AliITStrackV2(t) { | |
85 | //------------------------------------------------------------------ | |
86 | //Copy constructor | |
87 | //------------------------------------------------------------------ | |
88 | fNUsed = t.fNUsed; | |
89 | fReconstructed = t.fReconstructed; | |
90 | fNSkipped = t.fNSkipped; | |
91 | fNDeadZone = t.fNDeadZone; | |
92 | fDeadZoneProbability = t.fDeadZoneProbability; | |
93 | fLab = t.fLab; | |
94 | fFakeRatio = t.fFakeRatio; | |
95 | fdEdxMismatch = t.fdEdxMismatch; | |
96 | fChi22 = t.fChi22; | |
628e7bb0 | 97 | fGoldV0 = t.fGoldV0;; |
15dd636f | 98 | |
99 | fD[0]=t.fD[0]; fD[1]=t.fD[1]; | |
628e7bb0 | 100 | fDnorm[0] = t.fDnorm[0]; fDnorm[1]=t.fDnorm[1]; |
15dd636f | 101 | fExpQ= t.fExpQ; |
102 | for(Int_t i=0; i<6; i++) { | |
103 | 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]; | |
104 | } | |
105 | for(Int_t i=0; i<12; i++) {fDy[i]=t.fDy[i]; fDz[i]=t.fDz[i]; | |
106 | fSigmaY[i]=t.fSigmaY[i]; fSigmaZ[i]=t.fSigmaZ[i];fChi2MIP[i]=t.fChi2MIP[i];} | |
107 | fConstrain = t.fConstrain; | |
108 | //memcpy(fDy,t.fDy,6*sizeof(Float_t)); | |
109 | //memcpy(fDz,t.fDz,6*sizeof(Float_t)); | |
110 | //memcpy(fSigmaY,t.fSigmaY,6*sizeof(Float_t)); | |
111 | //memcpy(fSigmaZ,t.fSigmaZ,6*sizeof(Float_t)); | |
112 | //memcpy(fChi2MIP,t.fChi2MIP,12*sizeof(Float_t)); | |
113 | } | |
114 | ||
115 | //_____________________________________________________________________________ | |
116 | Int_t AliITStrackMI::Compare(const TObject *o) const { | |
117 | //----------------------------------------------------------------- | |
118 | // This function compares tracks according to the their curvature | |
119 | //----------------------------------------------------------------- | |
120 | AliITStrackMI *t=(AliITStrackMI*)o; | |
121 | //Double_t co=TMath::Abs(t->Get1Pt()); | |
122 | //Double_t c =TMath::Abs(Get1Pt()); | |
123 | 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])); | |
124 | Double_t c =GetSigmaY2()*GetSigmaZ2()*(0.5+TMath::Sqrt(0.5*fD[0]*fD[0]+fD[1]*fD[1])); | |
125 | if (c>co) return 1; | |
126 | else if (c<co) return -1; | |
127 | return 0; | |
128 | } | |
129 | ||
130 | ||
131 | Double_t AliITStrackMI::GetPredictedChi2MI(Double_t cy, Double_t cz, Double_t cerry, Double_t cerrz) const | |
132 | { | |
133 | //----------------------------------------------------------------- | |
134 | // This function calculates a predicted chi2 increment. | |
135 | //----------------------------------------------------------------- | |
136 | Double_t r00=cerry*cerry, r01=0., r11=cerrz*cerrz; | |
137 | r00+=fC00; r01+=fC10; r11+=fC11; | |
138 | // | |
139 | Double_t det=r00*r11 - r01*r01; | |
140 | if (TMath::Abs(det) < 1.e-30) { | |
141 | Int_t n=GetNumberOfClusters(); | |
142 | if (n>kWARN) | |
143 | Warning("GetPredictedChi2","Singular matrix (%d) !\n",n); | |
144 | return 1e10; | |
145 | } | |
146 | Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01; | |
147 | ||
148 | Double_t dy=cy - fP0, dz=cz - fP1; | |
149 | ||
150 | return (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det; | |
151 | } | |
152 | ||
153 | //____________________________________________________________________________ | |
154 | Int_t AliITStrackMI::CorrectForMaterial(Double_t d, Double_t x0) { | |
155 | //------------------------------------------------------------------ | |
156 | //This function corrects the track parameters for crossed material | |
157 | //------------------------------------------------------------------ | |
158 | // Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt()); | |
159 | Double_t p2=(1.+ fP3*fP3)/(Get1Pt()*Get1Pt()); | |
160 | Double_t et = p2 + GetMass()*GetMass(); | |
161 | Double_t beta2=p2/et; | |
162 | et = sqrt(et); | |
163 | d*=TMath::Sqrt((1.+ fP3*fP3)/(1.- fP2*fP2)); | |
164 | //d*=TMath::Sqrt(1.+ fP3*fP3 +fP2*fP2/(1.- fP2*fP2)); | |
165 | ||
166 | //Multiple scattering****************** | |
167 | if (d!=0) { | |
168 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*TMath::Abs(d); | |
169 | //Double_t theta2=1.0259e-6*14*14/28/(beta2*p2)*TMath::Abs(d)*9.36*2.33; | |
170 | fC22 += theta2*(1.- fP2*fP2)*(1. + fP3*fP3); | |
171 | fC33 += theta2*(1. + fP3*fP3)*(1. + fP3*fP3); | |
172 | fC43 += theta2*fP3*fP4*(1. + fP3*fP3); | |
173 | fC44 += theta2*fP3*fP4*fP3*fP4; | |
174 | } | |
175 | ||
176 | //Energy losses************************ | |
177 | if (x0!=0.) { | |
178 | d*=x0; | |
179 | // Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*d; | |
180 | //Double_t dE=0; | |
181 | Double_t dE = 0.265*0.153e-3*(39.2-55.6*beta2+28.7*beta2*beta2+27.41/beta2)*d; | |
182 | /* | |
183 | if (beta2/(1-beta2)>3.5*3.5){ | |
184 | dE=0.153e-3/beta2*(log(3.5*5940)+0.5*log(beta2/(1-beta2)) - beta2)*d; | |
185 | } | |
186 | else{ | |
187 | dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2)) - beta2)*d; | |
188 | dE+=0.06e-3/(beta2*beta2)*d; | |
189 | } | |
190 | */ | |
191 | fP4*=(1.- et/p2*dE); | |
192 | Double_t delta44 = (dE*fP4*et/p2); | |
193 | delta44*=delta44; | |
194 | fC44+= delta44/400.; | |
195 | } | |
196 | ||
197 | if (!Invariant()) return 0; | |
198 | ||
199 | return 1; | |
200 | } | |
201 | ||
202 | //____________________________________________________________________________ | |
203 | Int_t AliITStrackMI::UpdateMI(Double_t cy, Double_t cz, Double_t cerry, Double_t cerrz, Double_t chi2,UInt_t index) { | |
204 | //------------------------------------------------------------------ | |
205 | //This function updates track parameters | |
206 | //------------------------------------------------------------------ | |
207 | Double_t p0=fP0,p1=fP1,p2=fP2,p3=fP3,p4=fP4; | |
208 | Double_t c00=fC00; | |
209 | Double_t c10=fC10, c11=fC11; | |
210 | Double_t c20=fC20, c21=fC21, c22=fC22; | |
211 | Double_t c30=fC30, c31=fC31, c32=fC32, c33=fC33; | |
212 | Double_t c40=fC40, c41=fC41, c42=fC42, c43=fC43, c44=fC44; | |
213 | ||
214 | ||
215 | Double_t r00=cerry*cerry, r01=0., r11=cerrz*cerrz; | |
216 | r00+=fC00; r01+=fC10; r11+=fC11; | |
217 | Double_t det=r00*r11 - r01*r01; | |
218 | Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
219 | ||
220 | ||
221 | Double_t k00=fC00*r00+fC10*r01, k01=fC00*r01+fC10*r11; | |
222 | Double_t k10=fC10*r00+fC11*r01, k11=fC10*r01+fC11*r11; | |
223 | Double_t k20=fC20*r00+fC21*r01, k21=fC20*r01+fC21*r11; | |
224 | Double_t k30=fC30*r00+fC31*r01, k31=fC30*r01+fC31*r11; | |
225 | Double_t k40=fC40*r00+fC41*r01, k41=fC40*r01+fC41*r11; | |
226 | ||
227 | Double_t dy=cy - fP0, dz=cz - fP1; | |
228 | Int_t layer = (index & 0xf0000000) >> 28; | |
229 | fDy[layer] = dy; | |
230 | fDz[layer] = dz; | |
231 | fSigmaY[layer] = TMath::Sqrt(cerry*cerry+fC00); | |
232 | fSigmaZ[layer] = TMath::Sqrt(cerrz*cerrz+fC11); | |
233 | ||
234 | Double_t sf=fP2 + k20*dy + k21*dz; | |
235 | ||
236 | fP0 += k00*dy + k01*dz; | |
237 | fP1 += k10*dy + k11*dz; | |
238 | fP2 = sf; | |
239 | fP3 += k30*dy + k31*dz; | |
240 | fP4 += k40*dy + k41*dz; | |
241 | ||
242 | Double_t c01=fC10, c02=fC20, c03=fC30, c04=fC40; | |
243 | Double_t c12=fC21, c13=fC31, c14=fC41; | |
244 | ||
245 | fC00-=k00*fC00+k01*fC10; fC10-=k00*c01+k01*fC11; | |
246 | fC20-=k00*c02+k01*c12; fC30-=k00*c03+k01*c13; | |
247 | fC40-=k00*c04+k01*c14; | |
248 | ||
249 | fC11-=k10*c01+k11*fC11; | |
250 | fC21-=k10*c02+k11*c12; fC31-=k10*c03+k11*c13; | |
251 | fC41-=k10*c04+k11*c14; | |
252 | ||
253 | fC22-=k20*c02+k21*c12; fC32-=k20*c03+k21*c13; | |
254 | fC42-=k20*c04+k21*c14; | |
255 | ||
256 | fC33-=k30*c03+k31*c13; | |
257 | fC43-=k30*c04+k31*c14; | |
258 | ||
259 | fC44-=k40*c04+k41*c14; | |
260 | ||
261 | if (!Invariant()) { | |
262 | fP0=p0; fP1=p1; fP2=p2; fP3=p3; fP4=p4; | |
263 | fC00=c00; | |
264 | fC10=c10; fC11=c11; | |
265 | fC20=c20; fC21=c21; fC22=c22; | |
266 | fC30=c30; fC31=c31; fC32=c32; fC33=c33; | |
267 | fC40=c40; fC41=c41; fC42=c42; fC43=c43; fC44=c44; | |
268 | return 0; | |
269 | } | |
270 | ||
271 | if (chi2<0) return 1; | |
272 | Int_t n=GetNumberOfClusters(); | |
273 | fIndex[n]=index; | |
274 | SetNumberOfClusters(n+1); | |
275 | SetChi2(GetChi2()+chi2); | |
276 | ||
277 | return 1; | |
278 | } | |
279 | ||
280 | Int_t AliITStrackMI::GetProlongationFast(Double_t alp, Double_t xk,Double_t &y, Double_t &z) | |
281 | { | |
282 | //----------------------------------------------------------------------------- | |
283 | //get fast prolongation | |
284 | //----------------------------------------------------------------------------- | |
285 | Double_t ca=TMath::Cos(alp-fAlpha), sa=TMath::Sin(alp-fAlpha); | |
286 | Double_t cf=TMath::Sqrt(1.- fP2*fP2); | |
287 | // **** rotation ********************** | |
288 | y= -fX*sa + fP0*ca; | |
289 | // **** translation ****************** | |
290 | Double_t dx = xk- fX*ca - fP0*sa; | |
291 | Double_t f1=fP2*ca - cf*sa, f2=f1 + fP4*dx; | |
292 | if (TMath::Abs(f2) >= 0.9999) { | |
293 | return 0; | |
294 | } | |
295 | Double_t r1=TMath::Sqrt(1.- f1*f1), r2=TMath::Sqrt(1.- f2*f2); | |
296 | y += dx*(f1+f2)/(r1+r2); | |
297 | z = fP1+dx*(f1+f2)/(f1*r2 + f2*r1)*fP3; | |
298 | return 1; | |
299 | } | |
300 | ||
628e7bb0 | 301 | |
302 | Bool_t AliITStrackMI::IsGoldPrimary() | |
303 | { | |
304 | // | |
305 | // Indicates gold pimary track | |
306 | // | |
307 | Bool_t isGold=kTRUE; | |
308 | if (!fConstrain) return kFALSE; // | |
309 | if (fNDeadZone+fNDeadZone<5.5) isGold = kFALSE; // short track | |
310 | // | |
311 | if (fChi2/Float_t(fN)>2.){ | |
312 | if (fChi2MIP[0]+fNUsed>3.5) isGold = kFALSE; | |
313 | } | |
314 | if (fChi2MIP[2]>4.5) isGold = kFALSE; //back propagation chi2 | |
315 | // | |
316 | if (fDnorm[0]>0&&fDnorm[1]>0){ | |
317 | const Float_t distcut2 =2.5*2.5; //normalize distance cut | |
318 | 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) | |
319 | if (dist2>distcut2) isGold = kFALSE; | |
320 | } | |
321 | return isGold; | |
322 | } |