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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 ESD track class | |
18 | // This is the class to deal with during the phisical analysis of data | |
19 | // | |
20 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch | |
21 | //----------------------------------------------------------------- | |
22 | ||
23 | #include "TMath.h" | |
24 | ||
25 | #include "AliESDtrack.h" | |
26 | #include "AliKalmanTrack.h" | |
27 | #include "../ITS/AliITStrackV2.h" | |
28 | ||
29 | ClassImp(AliESDtrack) | |
30 | ||
31 | //_______________________________________________________________________ | |
32 | AliESDtrack::AliESDtrack() : | |
33 | fFlags(0), | |
34 | fITSncls(0), | |
35 | fTPCncls(0), | |
36 | fVertex(kFALSE) | |
37 | { | |
38 | // | |
39 | // The default ESD constructor | |
40 | // | |
41 | for (Int_t i=0; i<kSPECIES; i++) fR[i]=0.; | |
42 | } | |
43 | ||
44 | //_______________________________________________________________________ | |
45 | Float_t AliESDtrack::GetMass() const { | |
46 | Float_t max=0.; | |
47 | Int_t k=-1; | |
48 | for (Int_t i=0; i<kSPECIES; i++) { | |
49 | if (fR[i]>max) {k=i; max=fR[i];} | |
50 | } | |
51 | if (k==0) return 0.00051; | |
52 | if (k==1) return 0.10566; | |
53 | if (k==2||k==-1) return 0.13957; | |
54 | if (k==3) return 0.49368; | |
55 | if (k==4) return 0.93827; | |
56 | Warning("GetMass()","Undefined mass !"); | |
57 | return 0.13957; | |
58 | } | |
59 | ||
60 | //_______________________________________________________________________ | |
61 | Bool_t AliESDtrack::UpdateTrackParams(AliKalmanTrack *t, ULong_t flags) { | |
62 | // | |
63 | // This function updates track's running parameters | |
64 | // | |
65 | switch (flags) { | |
66 | ||
67 | case kITSin: | |
68 | case kITSout: | |
69 | case kITSrefit: | |
70 | fITSncls=t->GetNumberOfClusters(); | |
71 | fITSchi2=t->GetChi2(); | |
72 | for (Int_t i=0;i<fITSncls;i++) fITSindex[i]=t->GetClusterIndex(i); | |
73 | fITSsignal=t->GetPIDsignal(); | |
74 | break; | |
75 | ||
76 | case kTPCin: case kTPCout: case kTPCrefit: | |
77 | fTPCncls=t->GetNumberOfClusters(); | |
78 | fTPCchi2=t->GetChi2(); | |
79 | for (Int_t i=0;i<fTPCncls;i++) fTPCindex[i]=t->GetClusterIndex(i); | |
80 | fTPCsignal=t->GetPIDsignal(); | |
81 | {Double_t mass=t->GetMass(); // preliminary mass setting | |
82 | if (mass>0.5) fR[4]=1.; // used by | |
83 | else if (mass<0.4) fR[2]=1.; // the ITS reconstruction | |
84 | else fR[3]=1.;} // | |
85 | break; | |
86 | case kTRDin: case kTRDout: case kTRDrefit: | |
87 | fTRDncls=t->GetNumberOfClusters(); | |
88 | fTRDchi2=t->GetChi2(); | |
89 | fTRDsignal=t->GetPIDsignal(); | |
90 | break; | |
91 | default: | |
92 | Error("UpdateTrackParams()","Wrong flag !\n"); | |
93 | return kFALSE; | |
94 | } | |
95 | ||
96 | SetStatus(flags); | |
97 | fLabel=t->GetLabel(); | |
98 | ||
99 | if (t->IsStartedTimeIntegral()) { | |
100 | SetStatus(kTIME); | |
101 | Double_t times[10];t->GetIntegratedTimes(times); SetIntegratedTimes(times); | |
102 | SetIntegratedLength(t->GetIntegratedLength()); | |
103 | } | |
104 | ||
105 | fRalpha=t->GetAlpha(); | |
106 | t->GetExternalParameters(fRx,fRp); | |
107 | t->GetExternalCovariance(fRc); | |
108 | ||
109 | if (flags == kITSin) | |
110 | { | |
111 | AliITStrackV2* itstrack = dynamic_cast<AliITStrackV2*>(t); | |
112 | if (itstrack) | |
113 | { | |
114 | itstrack->PropagateTo(3.,0.0028,65.19); | |
115 | itstrack->PropagateToVertex(); | |
116 | ||
117 | Double_t ralpha=t->GetAlpha(); | |
118 | Double_t rx; // X-coordinate of the track reference plane | |
119 | Double_t rp[5]; // external track parameters | |
120 | t->GetExternalParameters(rx,rp); | |
121 | ||
122 | Double_t phi=TMath::ASin(rp[2]) + ralpha; | |
123 | Double_t pt=1./TMath::Abs(rp[4]); | |
124 | Double_t r=TMath::Sqrt(rx*rx + rp[0]*rp[0]); | |
125 | ||
126 | fVertexX=r*TMath::Cos(phi); | |
127 | fVertexY=r*TMath::Sin(phi); | |
128 | fVertexZ=rp[1]; | |
129 | ||
130 | fVertexPx = pt*TMath::Cos(phi); | |
131 | fVertexPy = pt*TMath::Sin(phi); | |
132 | fVertexPz = pt*rp[3]; | |
133 | fVertex = kTRUE; | |
134 | } | |
135 | } | |
136 | ||
137 | return kTRUE; | |
138 | } | |
139 | ||
140 | //_______________________________________________________________________ | |
141 | void AliESDtrack::GetExternalParametersAt(Double_t x, Double_t p[5]) const { | |
142 | //--------------------------------------------------------------------- | |
143 | // This function returns external representation of the track parameters | |
144 | // at the plane x | |
145 | //--------------------------------------------------------------------- | |
146 | Double_t dx=x-fRx; | |
147 | Double_t c=fRp[4]/AliKalmanTrack::GetConvConst(); | |
148 | Double_t f1=fRp[2], f2=f1 + c*dx; | |
149 | Double_t r1=sqrt(1.- f1*f1), r2=sqrt(1.- f2*f2); | |
150 | ||
151 | p[0]=fRp[0]+dx*(f1+f2)/(r1+r2); | |
152 | p[1]=fRp[1]+dx*(f1+f2)/(f1*r2 + f2*r1)*fRp[3]; | |
153 | p[2]=fRp[2]+dx*c; | |
154 | p[3]=fRp[3]; | |
155 | p[4]=fRp[4]; | |
156 | } | |
157 | ||
158 | //_______________________________________________________________________ | |
159 | void AliESDtrack::GetExternalParameters(Double_t &x, Double_t p[5]) const { | |
160 | //--------------------------------------------------------------------- | |
161 | // This function returns external representation of the track parameters | |
162 | //--------------------------------------------------------------------- | |
163 | x=fRx; | |
164 | for (Int_t i=0; i<5; i++) p[i]=fRp[i]; | |
165 | } | |
166 | ||
167 | Double_t AliESDtrack::GetP() const { | |
168 | //--------------------------------------------------------------------- | |
169 | // This function returns the track momentum | |
170 | //--------------------------------------------------------------------- | |
171 | Double_t lam=TMath::ATan(fRp[3]); | |
172 | Double_t pt=1./TMath::Abs(fRp[4]); | |
173 | return pt/TMath::Cos(lam); | |
174 | } | |
175 | ||
176 | void AliESDtrack::GetPxPyPz(Double_t *p) const { | |
177 | //--------------------------------------------------------------------- | |
178 | // This function returns the global track momentum components | |
179 | //--------------------------------------------------------------------- | |
180 | Double_t phi=TMath::ASin(fRp[2]) + fRalpha; | |
181 | Double_t pt=1./TMath::Abs(fRp[4]); | |
182 | p[0]=pt*TMath::Cos(phi); p[1]=pt*TMath::Sin(phi); p[2]=pt*fRp[3]; | |
183 | } | |
184 | ||
185 | void AliESDtrack::GetXYZ(Double_t *xyz) const { | |
186 | //--------------------------------------------------------------------- | |
187 | // This function returns the global track position | |
188 | //--------------------------------------------------------------------- | |
189 | Double_t phi=TMath::ASin(fRp[2]) + fRalpha; | |
190 | Double_t r=TMath::Sqrt(fRx*fRx + fRp[0]*fRp[0]); | |
191 | xyz[0]=r*TMath::Cos(phi); xyz[1]=r*TMath::Sin(phi); xyz[2]=fRp[1]; | |
192 | } | |
193 | ||
194 | //_______________________________________________________________________ | |
195 | void AliESDtrack::GetExternalCovariance(Double_t c[15]) const { | |
196 | //--------------------------------------------------------------------- | |
197 | // This function returns external representation of the cov. matrix | |
198 | //--------------------------------------------------------------------- | |
199 | for (Int_t i=0; i<15; i++) c[i]=fRc[i]; | |
200 | } | |
201 | ||
202 | //_______________________________________________________________________ | |
203 | void AliESDtrack::GetIntegratedTimes(Double_t *times) const { | |
204 | for (Int_t i=0; i<kSPECIES; i++) times[i]=fTrackTime[i]; | |
205 | } | |
206 | ||
207 | //_______________________________________________________________________ | |
208 | void AliESDtrack::SetIntegratedTimes(const Double_t *times) { | |
209 | for (Int_t i=0; i<kSPECIES; i++) fTrackTime[i]=times[i]; | |
210 | } | |
211 | ||
212 | //_______________________________________________________________________ | |
213 | void AliESDtrack::SetITSpid(const Double_t *p) { | |
214 | for (Int_t i=0; i<kSPECIES; i++) fITSr[i]=p[i]; | |
215 | SetStatus(AliESDtrack::kITSpid); | |
216 | } | |
217 | ||
218 | //_______________________________________________________________________ | |
219 | void AliESDtrack::GetITSpid(Double_t *p) const { | |
220 | for (Int_t i=0; i<kSPECIES; i++) p[i]=fITSr[i]; | |
221 | } | |
222 | ||
223 | //_______________________________________________________________________ | |
224 | Int_t AliESDtrack::GetITSclusters(UInt_t *idx) const { | |
225 | //--------------------------------------------------------------------- | |
226 | // This function returns indices of the assgined ITS clusters | |
227 | //--------------------------------------------------------------------- | |
228 | for (Int_t i=0; i<fITSncls; i++) idx[i]=fITSindex[i]; | |
229 | return fITSncls; | |
230 | } | |
231 | ||
232 | //_______________________________________________________________________ | |
233 | Int_t AliESDtrack::GetTPCclusters(Int_t *idx) const { | |
234 | //--------------------------------------------------------------------- | |
235 | // This function returns indices of the assgined ITS clusters | |
236 | //--------------------------------------------------------------------- | |
237 | for (Int_t i=0; i<180; i++) idx[i]=fTPCindex[i]; // MI I prefer some constant | |
238 | return fTPCncls; | |
239 | } | |
240 | ||
241 | //_______________________________________________________________________ | |
242 | void AliESDtrack::SetTPCpid(const Double_t *p) { | |
243 | for (Int_t i=0; i<kSPECIES; i++) fTPCr[i]=p[i]; | |
244 | SetStatus(AliESDtrack::kTPCpid); | |
245 | } | |
246 | ||
247 | //_______________________________________________________________________ | |
248 | void AliESDtrack::GetTPCpid(Double_t *p) const { | |
249 | for (Int_t i=0; i<kSPECIES; i++) p[i]=fTPCr[i]; | |
250 | } | |
251 | ||
252 | //_______________________________________________________________________ | |
253 | void AliESDtrack::SetTRDpid(const Double_t *p) { | |
254 | for (Int_t i=0; i<kSPECIES; i++) fTRDr[i]=p[i]; | |
255 | SetStatus(AliESDtrack::kTRDpid); | |
256 | } | |
257 | ||
258 | //_______________________________________________________________________ | |
259 | void AliESDtrack::GetTRDpid(Double_t *p) const { | |
260 | for (Int_t i=0; i<kSPECIES; i++) p[i]=fTRDr[i]; | |
261 | } | |
262 | ||
263 | //_______________________________________________________________________ | |
264 | void AliESDtrack::SetTRDpid(Int_t iSpecies, Float_t p) | |
265 | { | |
266 | fTRDr[iSpecies] = p; | |
267 | } | |
268 | ||
269 | Float_t AliESDtrack::GetTRDpid(Int_t iSpecies) const | |
270 | { | |
271 | return fTRDr[iSpecies]; | |
272 | } | |
273 | ||
274 | //_______________________________________________________________________ | |
275 | void AliESDtrack::SetTOFpid(const Double_t *p) { | |
276 | for (Int_t i=0; i<kSPECIES; i++) fTOFr[i]=p[i]; | |
277 | SetStatus(AliESDtrack::kTOFpid); | |
278 | } | |
279 | ||
280 | //_______________________________________________________________________ | |
281 | void AliESDtrack::GetTOFpid(Double_t *p) const { | |
282 | for (Int_t i=0; i<kSPECIES; i++) p[i]=fTOFr[i]; | |
283 | } | |
284 | ||
285 | //_______________________________________________________________________ | |
286 | void AliESDtrack::SetESDpid(const Double_t *p) { | |
287 | for (Int_t i=0; i<kSPECIES; i++) fR[i]=p[i]; | |
288 | SetStatus(AliESDtrack::kESDpid); | |
289 | } | |
290 | ||
291 | //_______________________________________________________________________ | |
292 | void AliESDtrack::GetESDpid(Double_t *p) const { | |
293 | for (Int_t i=0; i<kSPECIES; i++) p[i]=fR[i]; | |
294 | } | |
295 | ||
296 | void AliESDtrack::GetVertexXYZ(Double_t& x,Double_t& y, Double_t&z) const | |
297 | { | |
298 | //returns track position in DCA to vertex | |
299 | x = fVertexX; | |
300 | y = fVertexY; | |
301 | z = fVertexZ; | |
302 | } | |
303 | void AliESDtrack::GetVertexPxPyPz(Double_t& px,Double_t& py, Double_t& pz) const | |
304 | { | |
305 | //returns track momentum in DCA to vertex | |
306 | px = fVertexPx; | |
307 | py = fVertexPy; | |
308 | pz = fVertexPz; | |
309 | } |