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46d29e70 | 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 | ||
0fa7dfa7 | 16 | /* $Id$ */ |
46d29e70 | 17 | |
a2cb5b3d | 18 | #include <Riostream.h> |
53c17fbf | 19 | #include <TMath.h> |
46d29e70 | 20 | |
53c17fbf | 21 | #include "AliESDtrack.h" |
46d29e70 | 22 | #include "AliTRDgeometry.h" |
23 | #include "AliTRDcluster.h" | |
24 | #include "AliTRDtrack.h" | |
53c17fbf | 25 | #include "AliTRDtracklet.h" |
b3a5a838 | 26 | |
46d29e70 | 27 | ClassImp(AliTRDtrack) |
28 | ||
53c17fbf | 29 | /////////////////////////////////////////////////////////////////////////////// |
30 | // // | |
31 | // Represents a reconstructed TRD track // | |
32 | // Local TRD Kalman track // | |
33 | // // | |
34 | /////////////////////////////////////////////////////////////////////////////// | |
7ad19338 | 35 | |
46d29e70 | 36 | //_____________________________________________________________________________ |
a819a5f7 | 37 | AliTRDtrack::AliTRDtrack(const AliTRDcluster *c, UInt_t index, |
5443e65e | 38 | const Double_t xx[5], const Double_t cc[15], |
7ad19338 | 39 | Double_t xref, Double_t alpha) : AliKalmanTrack() { |
46d29e70 | 40 | //----------------------------------------------------------------- |
41 | // This is the main track constructor. | |
42 | //----------------------------------------------------------------- | |
5443e65e | 43 | |
44 | fSeedLab = -1; | |
46d29e70 | 45 | |
46 | fAlpha=alpha; | |
5443e65e | 47 | if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi(); |
48 | if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
49 | ||
46d29e70 | 50 | fX=xref; |
51 | ||
b3a5a838 | 52 | fY=xx[0]; fZ=xx[1]; fE=xx[2]; fT=xx[3]; fC=xx[4]; |
c84a5e9e | 53 | |
54 | SaveLocalConvConst(); | |
46d29e70 | 55 | |
56 | fCyy=cc[0]; | |
57 | fCzy=cc[1]; fCzz=cc[2]; | |
b3a5a838 | 58 | fCey=cc[3]; fCez=cc[4]; fCee=cc[5]; |
59 | fCty=cc[6]; fCtz=cc[7]; fCte=cc[8]; fCtt=cc[9]; | |
b8dc2353 | 60 | fCcy=cc[10]; fCcz=cc[11]; fCce=cc[12]; fCct=cc[13]; fCcc=cc[14]; |
61 | ||
5443e65e | 62 | fIndex[0]=index; |
63 | SetNumberOfClusters(1); | |
64 | ||
65 | fdEdx=0.; | |
03b0452e | 66 | fdEdxT=0.; |
3fad3d32 | 67 | fDE=0.; |
53c17fbf | 68 | for (Int_t i=0;i<kNplane;i++){ |
eab5961e | 69 | fdEdxPlane[i] = 0.; |
70 | fTimBinPlane[i] = -1; | |
71 | } | |
a2b90f83 | 72 | |
b3a5a838 | 73 | fLhElectron = 0.0; |
9c9d2487 | 74 | fNWrong = 0; |
75 | fNRotate = 0; | |
3c625a9b | 76 | fStopped = 0; |
4f1c04d3 | 77 | fNCross =0; |
78 | fNLast =0; | |
79 | fChi2Last=0; | |
80 | fNExpected=0; | |
81 | fNExpectedLast=0; | |
82 | fNdedx=0; | |
5443e65e | 83 | Double_t q = TMath::Abs(c->GetQ()); |
a819a5f7 | 84 | Double_t s = fX*fC - fE, t=fT; |
5443e65e | 85 | if(s*s < 1) q *= TMath::Sqrt((1-s*s)/(1+t*t)); |
86 | ||
87 | fdQdl[0] = q; | |
0d5b5c27 | 88 | |
89 | // initialisation [SR, GSI 18.02.2003] (i startd for 1) | |
53c17fbf | 90 | for(UInt_t i=1; i<kMAXCLUSTERSPERTRACK; i++) { |
0d5b5c27 | 91 | fdQdl[i] = 0; |
92 | fIndex[i] = 0; | |
53c17fbf | 93 | fIndexBackup[i] = 0; //backup indexes MI |
0d5b5c27 | 94 | } |
03b0452e | 95 | for (Int_t i=0;i<3;i++) { fBudget[i]=0;}; |
53c17fbf | 96 | |
97 | fBackupTrack = 0; | |
98 | ||
46d29e70 | 99 | } |
100 | ||
101 | //_____________________________________________________________________________ | |
53c17fbf | 102 | AliTRDtrack::AliTRDtrack(const AliTRDtrack& t) : AliKalmanTrack(t) |
103 | { | |
46d29e70 | 104 | // |
105 | // Copy constructor. | |
106 | // | |
b8dc2353 | 107 | |
5443e65e | 108 | SetLabel(t.GetLabel()); |
109 | fSeedLab=t.GetSeedLabel(); | |
46d29e70 | 110 | |
5443e65e | 111 | SetChi2(t.GetChi2()); |
46d29e70 | 112 | fdEdx=t.fdEdx; |
03b0452e | 113 | fdEdxT=t.fdEdxT; |
3fad3d32 | 114 | fDE=t.fDE; |
53c17fbf | 115 | for (Int_t i=0;i<kNplane;i++){ |
eab5961e | 116 | fdEdxPlane[i] = t.fdEdxPlane[i]; |
117 | fTimBinPlane[i] = t.fTimBinPlane[i]; | |
96c3a73c | 118 | fTracklets[i] = t.fTracklets[i]; |
eab5961e | 119 | } |
46d29e70 | 120 | |
b3a5a838 | 121 | fLhElectron = 0.0; |
9c9d2487 | 122 | fNWrong = t.fNWrong; |
123 | fNRotate = t.fNRotate; | |
3c625a9b | 124 | fStopped = t.fStopped; |
4f1c04d3 | 125 | fNCross = t.fNCross; |
126 | fNExpected = t.fNExpected; | |
127 | fNExpectedLast = t.fNExpectedLast; | |
128 | fNdedx = t.fNdedx; | |
129 | fNLast = t.fNLast; | |
130 | fChi2Last = t.fChi2Last; | |
131 | fBackupTrack =0; | |
46d29e70 | 132 | fAlpha=t.fAlpha; |
133 | fX=t.fX; | |
134 | ||
4f1c04d3 | 135 | |
b8dc2353 | 136 | fY=t.fY; fZ=t.fZ; fE=t.fE; fT=t.fT; fC=t.fC; |
46d29e70 | 137 | |
138 | fCyy=t.fCyy; | |
139 | fCzy=t.fCzy; fCzz=t.fCzz; | |
b3a5a838 | 140 | fCey=t.fCey; fCez=t.fCez; fCee=t.fCee; |
141 | fCty=t.fCty; fCtz=t.fCtz; fCte=t.fCte; fCtt=t.fCtt; | |
b8dc2353 | 142 | fCcy=t.fCcy; fCcz=t.fCcz; fCce=t.fCce; fCct=t.fCct; fCcc=t.fCcc; |
46d29e70 | 143 | |
5443e65e | 144 | Int_t n=t.GetNumberOfClusters(); |
145 | SetNumberOfClusters(n); | |
146 | for (Int_t i=0; i<n; i++) { | |
a819a5f7 | 147 | fIndex[i]=t.fIndex[i]; |
46e2d86c | 148 | fIndexBackup[i]=t.fIndex[i]; // MI - backup indexes |
a819a5f7 | 149 | fdQdl[i]=t.fdQdl[i]; |
150 | } | |
b8dc2353 | 151 | |
0d5b5c27 | 152 | // initialisation (i starts from n) [SR, GSI, 18.02.2003] |
53c17fbf | 153 | for(UInt_t i=n; i<kMAXCLUSTERSPERTRACK; i++) { |
0d5b5c27 | 154 | fdQdl[i] = 0; |
155 | fIndex[i] = 0; | |
46e2d86c | 156 | fIndexBackup[i] = 0; //MI backup indexes |
0d5b5c27 | 157 | } |
03b0452e | 158 | for (Int_t i=0;i<6;i++){ |
159 | fTracklets[i] = t.fTracklets[i]; | |
160 | } | |
161 | for (Int_t i=0;i<3;i++) { fBudget[i]=t.fBudget[i];}; | |
5443e65e | 162 | } |
163 | ||
164 | //_____________________________________________________________________________ | |
b3a5a838 | 165 | AliTRDtrack::AliTRDtrack(const AliKalmanTrack& t, Double_t alpha) |
53c17fbf | 166 | :AliKalmanTrack(t) |
167 | { | |
5443e65e | 168 | // |
169 | // Constructor from AliTPCtrack or AliITStrack . | |
170 | // | |
171 | ||
172 | SetLabel(t.GetLabel()); | |
173 | SetChi2(0.); | |
b8dc2353 | 174 | SetMass(t.GetMass()); |
5443e65e | 175 | SetNumberOfClusters(0); |
176 | ||
bbc6cd2c | 177 | fdEdx=t.GetPIDsignal(); |
aa504dc7 | 178 | fDE = 0; |
53c17fbf | 179 | for (Int_t i=0;i<kNplane;i++){ |
eab5961e | 180 | fdEdxPlane[i] = 0.0; |
181 | fTimBinPlane[i] = -1; | |
182 | } | |
5443e65e | 183 | |
b3a5a838 | 184 | fLhElectron = 0.0; |
9c9d2487 | 185 | fNWrong = 0; |
186 | fNRotate = 0; | |
3c625a9b | 187 | fStopped = 0; |
4f1c04d3 | 188 | fNExpected=0; |
189 | fNExpectedLast=0; | |
190 | fNdedx =0; | |
191 | fNCross =0; | |
192 | fNLast =0; | |
193 | fChi2Last =0; | |
194 | fBackupTrack =0; | |
b3a5a838 | 195 | |
5443e65e | 196 | fAlpha = alpha; |
197 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
198 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
199 | ||
200 | Double_t x, p[5]; t.GetExternalParameters(x,p); | |
201 | ||
202 | fX=x; | |
203 | ||
b8dc2353 | 204 | fY=p[0]; |
205 | fZ=p[1]; | |
c84a5e9e | 206 | fT=p[3]; x=GetLocalConvConst(); |
b3a5a838 | 207 | fC=p[4]/x; |
b8dc2353 | 208 | fE=fC*fX - p[2]; |
5443e65e | 209 | |
210 | //Conversion of the covariance matrix | |
211 | Double_t c[15]; t.GetExternalCovariance(c); | |
79e94bf8 | 212 | |
213 | c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x; | |
214 | ||
215 | Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5]; | |
216 | Double_t c32=fX*c[13] - c[8]; | |
217 | Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12]; | |
218 | ||
219 | fCyy=c[0 ]; | |
220 | fCzy=c[1 ]; fCzz=c[2 ]; | |
221 | fCey=c20; fCez=c21; fCee=c22; | |
222 | fCty=c[6 ]; fCtz=c[7 ]; fCte=c32; fCtt=c[9 ]; | |
223 | fCcy=c[10]; fCcz=c[11]; fCce=c42; fCct=c[13]; fCcc=c[14]; | |
224 | ||
225 | // Initialization [SR, GSI, 18.02.2003] | |
53c17fbf | 226 | for(UInt_t i=0; i<kMAXCLUSTERSPERTRACK; i++) { |
79e94bf8 | 227 | fdQdl[i] = 0; |
228 | fIndex[i] = 0; | |
46e2d86c | 229 | fIndexBackup[i] = 0; // MI backup indexes |
79e94bf8 | 230 | } |
4f1c04d3 | 231 | |
03b0452e | 232 | for (Int_t i=0;i<3;i++) { fBudget[i]=0;}; |
79e94bf8 | 233 | } |
53c17fbf | 234 | |
79e94bf8 | 235 | //_____________________________________________________________________________ |
236 | AliTRDtrack::AliTRDtrack(const AliESDtrack& t) | |
53c17fbf | 237 | :AliKalmanTrack() |
238 | { | |
79e94bf8 | 239 | // |
240 | // Constructor from AliESDtrack | |
241 | // | |
53c17fbf | 242 | |
79e94bf8 | 243 | SetLabel(t.GetLabel()); |
244 | SetChi2(0.); | |
245 | SetMass(t.GetMass()); | |
1e9bb598 | 246 | SetNumberOfClusters(t.GetTRDclusters(fIndex)); |
46e2d86c | 247 | Int_t ncl = t.GetTRDclusters(fIndexBackup); |
53c17fbf | 248 | for (UInt_t i=ncl;i<kMAXCLUSTERSPERTRACK;i++) { |
46e2d86c | 249 | fIndexBackup[i]=0; |
250 | fIndex[i] = 0; //MI store indexes | |
251 | } | |
aa504dc7 | 252 | fdEdx=t.GetTRDsignal(); |
253 | fDE =0; | |
53c17fbf | 254 | for (Int_t i=0;i<kNplane;i++){ |
eab5961e | 255 | fdEdxPlane[i] = t.GetTRDsignals(i); |
256 | fTimBinPlane[i] = t.GetTRDTimBin(i); | |
257 | } | |
79e94bf8 | 258 | |
259 | fLhElectron = 0.0; | |
260 | fNWrong = 0; | |
3c625a9b | 261 | fStopped = 0; |
79e94bf8 | 262 | fNRotate = 0; |
4f1c04d3 | 263 | fNExpected =0; |
264 | fNExpectedLast=0; | |
265 | fNdedx = 0; | |
266 | fNCross =0; | |
267 | fNLast =0; | |
268 | fChi2Last =0; | |
269 | fBackupTrack =0; | |
79e94bf8 | 270 | |
271 | fAlpha = t.GetAlpha(); | |
272 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
273 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
274 | ||
275 | Double_t x, p[5]; t.GetExternalParameters(x,p); | |
c5a8e3df | 276 | //Conversion of the covariance matrix |
277 | Double_t c[15]; t.GetExternalCovariance(c); | |
25cde026 | 278 | if (t.GetStatus()&AliESDtrack::kTRDbackup){ |
c0b978f0 | 279 | t.GetOuterExternalParameters(fAlpha,x,p); |
c9ec41e8 | 280 | t.GetOuterExternalCovariance(c); |
f4e9508c | 281 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); |
282 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
c5a8e3df | 283 | } |
79e94bf8 | 284 | |
285 | fX=x; | |
286 | ||
79e94bf8 | 287 | fY=p[0]; |
c84a5e9e | 288 | fZ=p[1]; SaveLocalConvConst(); |
289 | fT=p[3]; x=GetLocalConvConst(); | |
79e94bf8 | 290 | fC=p[4]/x; |
291 | fE=fC*fX - p[2]; | |
292 | ||
5443e65e | 293 | |
294 | c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x; | |
295 | ||
296 | Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5]; | |
297 | Double_t c32=fX*c[13] - c[8]; | |
298 | Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12]; | |
299 | ||
b8dc2353 | 300 | fCyy=c[0 ]; |
301 | fCzy=c[1 ]; fCzz=c[2 ]; | |
302 | fCey=c20; fCez=c21; fCee=c22; | |
303 | fCty=c[6 ]; fCtz=c[7 ]; fCte=c32; fCtt=c[9 ]; | |
304 | fCcy=c[10]; fCcz=c[11]; fCce=c42; fCct=c[13]; fCcc=c[14]; | |
5443e65e | 305 | |
0d5b5c27 | 306 | // Initialization [SR, GSI, 18.02.2003] |
53c17fbf | 307 | for(UInt_t i=0; i<kMAXCLUSTERSPERTRACK; i++) { |
0d5b5c27 | 308 | fdQdl[i] = 0; |
46e2d86c | 309 | // fIndex[i] = 0; //MI store indexes |
0d5b5c27 | 310 | } |
c630aafd | 311 | |
03b0452e | 312 | for (Int_t i=0;i<3;i++) { fBudget[i]=0;}; |
c630aafd | 313 | if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return; |
314 | StartTimeIntegral(); | |
315 | Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times); | |
316 | SetIntegratedLength(t.GetIntegratedLength()); | |
317 | ||
16d9fbba | 318 | } |
319 | ||
53c17fbf | 320 | //____________________________________________________________________________ |
321 | AliTRDtrack::~AliTRDtrack() | |
3fad3d32 | 322 | { |
323 | // | |
53c17fbf | 324 | // Destructor |
325 | // | |
3fad3d32 | 326 | |
53c17fbf | 327 | if (fBackupTrack) delete fBackupTrack; |
328 | fBackupTrack = 0; | |
3fad3d32 | 329 | |
53c17fbf | 330 | } |
331 | ||
332 | //____________________________________________________________________________ | |
333 | AliTRDtrack &AliTRDtrack::operator=(const AliTRDtrack &t) | |
16d9fbba | 334 | { |
335 | // | |
53c17fbf | 336 | // Assignment operator |
16d9fbba | 337 | // |
eab5961e | 338 | |
53c17fbf | 339 | fLhElectron = 0.0; |
340 | fNWrong = 0; | |
341 | fStopped = 0; | |
342 | fNRotate = 0; | |
343 | fNExpected =0; | |
344 | fNExpectedLast=0; | |
345 | fNdedx = 0; | |
346 | fNCross =0; | |
347 | fNLast =0; | |
348 | fChi2Last =0; | |
349 | fBackupTrack =0; | |
350 | ||
351 | fAlpha = t.GetAlpha(); | |
352 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
353 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
354 | ||
355 | return *this; | |
eab5961e | 356 | |
16d9fbba | 357 | } |
9c9d2487 | 358 | |
53c17fbf | 359 | // //____________________________________________________________________________ |
360 | // AliTRDtrack * AliTRDtrack::MakeTrack(const AliTrackReference *ref, Double_t mass) | |
361 | // { | |
362 | // // | |
363 | // // Make dummy track from the track reference | |
364 | // // negative mass means opposite charge | |
365 | // // | |
366 | // Double_t xx[5]; | |
367 | // Double_t cc[15]; | |
368 | // for (Int_t i=0;i<15;i++) cc[i]=0; | |
369 | // Double_t x = ref->X(), y = ref->Y(), z = ref->Z(); | |
370 | // Double_t alpha = TMath::ATan2(y,x); | |
371 | // Double_t xr = TMath::Sqrt(x*x+y*y); | |
372 | // xx[0] = 0; | |
373 | // xx[1] = z; | |
374 | // xx[3] = ref->Pz()/ref->Pt(); | |
375 | // Float_t b[3]; | |
376 | // Float_t xyz[3]={x,y,z}; | |
377 | // Float_t convConst = 0; | |
378 | // (AliKalmanTrack::GetFieldMap())->Field(xyz,b); | |
379 | // convConst=1000/0.299792458/(1e-13 - b[2]); | |
380 | // xx[4] = 1./(convConst*ref->Pt()); | |
381 | // if (mass<0) xx[4]*=-1.; // negative mass - negative direction | |
382 | // Double_t lcos = (x*ref->Px()+y*ref->Py())/(xr*ref->Pt()); | |
383 | // Double_t lsin = TMath::Sin(TMath::ACos(lcos)); | |
384 | // if (mass<0) lsin*=-1.; | |
385 | // xx[2] = xr*xx[4]-lsin; | |
386 | // AliTRDcluster cl; | |
387 | // AliTRDtrack * track = new AliTRDtrack(&cl,100,xx,cc,xr,alpha); | |
388 | // track->SetMass(TMath::Abs(mass)); | |
389 | // track->StartTimeIntegral(); | |
390 | // return track; | |
391 | // } | |
8206377c | 392 | |
53c17fbf | 393 | //____________________________________________________________________________ |
394 | Float_t AliTRDtrack::StatusForTOF() | |
7ad19338 | 395 | { |
53c17fbf | 396 | // |
397 | // Defines the status of the TOF extrapolation | |
398 | // | |
03b0452e | 399 | |
400 | Float_t res = (0.2 + 0.8*(fN/(fNExpected+5.)))*(0.4+0.6*fTracklets[5].GetN()/20.); | |
401 | res *= (0.25+0.8*40./(40.+fBudget[2])); | |
402 | return res; | |
403 | ||
4f1c04d3 | 404 | Int_t status=0; |
405 | if (GetNumberOfClusters()<20) return 0; // | |
c84a5e9e | 406 | if (fN>110&&fChi2/(Float_t(fN))<3) return 3; //gold |
407 | if (fNLast>30&&fChi2Last/(Float_t(fNLast))<3) return 3; //gold | |
408 | if (fNLast>20&&fChi2Last/(Float_t(fNLast))<2) return 3; //gold | |
409 | if (fNLast/(fNExpectedLast+3.)>0.8 && fChi2Last/Float_t(fNLast)<5&&fNLast>20) return 2; //silber | |
410 | if (fNLast>5 &&((fNLast+1.)/(fNExpectedLast+1.))>0.8&&fChi2Last/(fNLast-5.)<6) return 1; | |
53c17fbf | 411 | |
4f1c04d3 | 412 | return status; |
53c17fbf | 413 | |
4f1c04d3 | 414 | } |
415 | ||
5443e65e | 416 | //____________________________________________________________________________ |
53c17fbf | 417 | void AliTRDtrack::GetExternalParameters(Double_t& xr, Double_t x[5]) const |
418 | { | |
5443e65e | 419 | // |
420 | // This function returns external TRD track representation | |
421 | // | |
53c17fbf | 422 | |
423 | xr = fX; | |
424 | x[0] = GetY(); | |
425 | x[1] = GetZ(); | |
426 | x[2] = GetSnp(); | |
427 | x[3] = GetTgl(); | |
428 | x[4] = Get1Pt(); | |
429 | ||
5443e65e | 430 | } |
431 | ||
432 | //_____________________________________________________________________________ | |
53c17fbf | 433 | void AliTRDtrack::GetExternalCovariance(Double_t cc[15]) const |
434 | { | |
5443e65e | 435 | // |
436 | // This function returns external representation of the covriance matrix. | |
437 | // | |
53c17fbf | 438 | |
c84a5e9e | 439 | Double_t a=GetLocalConvConst(); |
5443e65e | 440 | |
b3a5a838 | 441 | Double_t c22=fX*fX*fCcc-2*fX*fCce+fCee; |
442 | Double_t c32=fX*fCct-fCte; | |
443 | Double_t c20=fX*fCcy-fCey, c21=fX*fCcz-fCez, c42=fX*fCcc-fCce; | |
5443e65e | 444 | |
445 | cc[0 ]=fCyy; | |
446 | cc[1 ]=fCzy; cc[2 ]=fCzz; | |
447 | cc[3 ]=c20; cc[4 ]=c21; cc[5 ]=c22; | |
448 | cc[6 ]=fCty; cc[7 ]=fCtz; cc[8 ]=c32; cc[9 ]=fCtt; | |
b8dc2353 | 449 | cc[10]=fCcy*a; cc[11]=fCcz*a; cc[12]=c42*a; cc[13]=fCct*a; cc[14]=fCcc*a*a; |
450 | ||
5443e65e | 451 | } |
452 | ||
46d29e70 | 453 | //_____________________________________________________________________________ |
53c17fbf | 454 | void AliTRDtrack::GetCovariance(Double_t cc[15]) const |
455 | { | |
456 | // | |
457 | // Returns the track covariance matrix | |
458 | // | |
b8dc2353 | 459 | |
46d29e70 | 460 | cc[0]=fCyy; |
461 | cc[1]=fCzy; cc[2]=fCzz; | |
b3a5a838 | 462 | cc[3]=fCey; cc[4]=fCez; cc[5]=fCee; |
463 | cc[6]=fCcy; cc[7]=fCcz; cc[8]=fCce; cc[9]=fCcc; | |
464 | cc[10]=fCty; cc[11]=fCtz; cc[12]=fCte; cc[13]=fCct; cc[14]=fCtt; | |
b8dc2353 | 465 | |
46d29e70 | 466 | } |
467 | ||
468 | //_____________________________________________________________________________ | |
53c17fbf | 469 | Int_t AliTRDtrack::Compare(const TObject *o) const |
470 | { | |
471 | // | |
472 | // Compares tracks according to their Y2 or curvature | |
473 | // | |
46d29e70 | 474 | |
475 | AliTRDtrack *t=(AliTRDtrack*)o; | |
476 | // Double_t co=t->GetSigmaY2(); | |
477 | // Double_t c =GetSigmaY2(); | |
478 | ||
479 | Double_t co=TMath::Abs(t->GetC()); | |
480 | Double_t c =TMath::Abs(GetC()); | |
481 | ||
53c17fbf | 482 | if (c>co) return 1; |
46d29e70 | 483 | else if (c<co) return -1; |
484 | return 0; | |
53c17fbf | 485 | |
46d29e70 | 486 | } |
487 | ||
a819a5f7 | 488 | //_____________________________________________________________________________ |
489 | void AliTRDtrack::CookdEdx(Double_t low, Double_t up) { | |
490 | //----------------------------------------------------------------- | |
491 | // Calculates dE/dX within the "low" and "up" cuts. | |
492 | //----------------------------------------------------------------- | |
5443e65e | 493 | |
a819a5f7 | 494 | Int_t i; |
4f1c04d3 | 495 | //Int_t nc=GetNumberOfClusters(); |
496 | Int_t nc=fNdedx; | |
497 | if (nc<10) { | |
498 | SetdEdx(0); | |
499 | return; | |
500 | } | |
a819a5f7 | 501 | |
53c17fbf | 502 | Float_t sorted[kMAXCLUSTERSPERTRACK]; |
5443e65e | 503 | for (i=0; i < nc; i++) { |
c84a5e9e | 504 | sorted[i]=fdQdl[i]; |
5443e65e | 505 | } |
a819a5f7 | 506 | Int_t nl=Int_t(low*nc), nu=Int_t(up*nc); |
507 | Float_t dedx=0; | |
c84a5e9e | 508 | //for (i=nl; i<=nu; i++) dedx += sorted[i]; |
509 | //dedx /= (nu-nl+1); | |
510 | for (i=0; i<nc; i++) dedx += sorted[i]; // ADDED by PS | |
511 | if((nu-nl)) dedx /= (nu-nl); // ADDED by PS | |
5443e65e | 512 | |
3551db50 | 513 | //SetdEdx(dedx); |
03b0452e | 514 | // |
515 | // now real truncated mean | |
516 | for (i=0; i < nc; i++) { | |
517 | sorted[i]=TMath::Abs(fdQdl[i]); | |
518 | } | |
519 | Int_t * index = new Int_t[nc]; | |
520 | TMath::Sort(nc, sorted, index,kFALSE); | |
521 | dedx=0; | |
522 | for (i=nl; i<=nu; i++) dedx += sorted[index[i]]; | |
523 | dedx /= (nu-nl+1); | |
524 | fdEdxT = dedx; | |
525 | delete [] index; | |
3551db50 | 526 | SetdEdx(dedx); |
527 | ||
a819a5f7 | 528 | } |
529 | ||
46d29e70 | 530 | //_____________________________________________________________________________ |
b3a5a838 | 531 | Int_t AliTRDtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho) |
46d29e70 | 532 | { |
533 | // Propagates a track of particle with mass=pm to a reference plane | |
534 | // defined by x=xk through media of density=rho and radiationLength=x0 | |
535 | ||
9c9d2487 | 536 | if (xk == fX) return 1; |
537 | ||
3c625a9b | 538 | if (TMath::Abs(fC*xk - fE) >= 0.90000) { |
539 | // Int_t n=GetNumberOfClusters(); | |
540 | //if (n>4) cerr << n << " AliTRDtrack: Propagation failed, \tPt = " | |
541 | // << GetPt() << "\t" << GetLabel() << "\t" << GetMass() << endl; | |
46d29e70 | 542 | return 0; |
543 | } | |
c84a5e9e | 544 | Double_t lcc=GetLocalConvConst(); |
46d29e70 | 545 | |
0d5b5c27 | 546 | // track Length measurement [SR, GSI, 17.02.2003] |
547 | Double_t oldX = fX, oldY = fY, oldZ = fZ; | |
548 | ||
46d29e70 | 549 | Double_t x1=fX, x2=x1+(xk-x1), dx=x2-x1, y1=fY, z1=fZ; |
5443e65e | 550 | Double_t c1=fC*x1 - fE; |
551 | if((c1*c1) > 1) return 0; | |
552 | Double_t r1=sqrt(1.- c1*c1); | |
b8dc2353 | 553 | Double_t c2=fC*x2 - fE; |
5443e65e | 554 | if((c2*c2) > 1) return 0; |
555 | Double_t r2=sqrt(1.- c2*c2); | |
46d29e70 | 556 | |
557 | fY += dx*(c1+c2)/(r1+r2); | |
558 | fZ += dx*(c1+c2)/(c1*r2 + c2*r1)*fT; | |
559 | ||
560 | //f = F - 1 | |
561 | Double_t rr=r1+r2, cc=c1+c2, xx=x1+x2; | |
b3a5a838 | 562 | Double_t f02=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr); |
563 | Double_t f04= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr); | |
46d29e70 | 564 | Double_t cr=c1*r2+c2*r1; |
b3a5a838 | 565 | Double_t f12=-dx*fT*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr); |
566 | Double_t f13= dx*cc/cr; | |
b8dc2353 | 567 | Double_t f14=dx*fT*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr); |
46d29e70 | 568 | |
569 | //b = C*ft | |
b3a5a838 | 570 | Double_t b00=f02*fCey + f04*fCcy, b01=f12*fCey + f14*fCcy + f13*fCty; |
571 | Double_t b10=f02*fCez + f04*fCcz, b11=f12*fCez + f14*fCcz + f13*fCtz; | |
572 | Double_t b20=f02*fCee + f04*fCce, b21=f12*fCee + f14*fCce + f13*fCte; | |
573 | Double_t b30=f02*fCte + f04*fCct, b31=f12*fCte + f14*fCct + f13*fCtt; | |
574 | Double_t b40=f02*fCce + f04*fCcc, b41=f12*fCce + f14*fCcc + f13*fCct; | |
46d29e70 | 575 | |
576 | //a = f*b = f*C*ft | |
b3a5a838 | 577 | Double_t a00=f02*b20+f04*b40,a01=f02*b21+f04*b41,a11=f12*b21+f14*b41+f13*b31; |
46d29e70 | 578 | |
579 | //F*C*Ft = C + (a + b + bt) | |
580 | fCyy += a00 + 2*b00; | |
581 | fCzy += a01 + b01 + b10; | |
b3a5a838 | 582 | fCey += b20; |
583 | fCty += b30; | |
584 | fCcy += b40; | |
46d29e70 | 585 | fCzz += a11 + 2*b11; |
b3a5a838 | 586 | fCez += b21; |
587 | fCtz += b31; | |
b8dc2353 | 588 | fCcz += b41; |
46d29e70 | 589 | |
b8dc2353 | 590 | fX=x2; |
46d29e70 | 591 | |
c84a5e9e | 592 | //Change of the magnetic field ************* |
593 | SaveLocalConvConst(); | |
594 | cc=fC; | |
595 | fC*=lcc/GetLocalConvConst(); | |
596 | fE+=fX*(fC-cc); | |
597 | ||
46d29e70 | 598 | //Multiple scattering ****************** |
46d29e70 | 599 | Double_t d=sqrt((x1-fX)*(x1-fX)+(y1-fY)*(y1-fY)+(z1-fZ)*(z1-fZ)); |
b8dc2353 | 600 | Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt()); |
b3a5a838 | 601 | Double_t beta2=p2/(p2 + GetMass()*GetMass()); |
b8dc2353 | 602 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho; |
c84a5e9e | 603 | |
46d29e70 | 604 | Double_t ey=fC*fX - fE, ez=fT; |
605 | Double_t xz=fC*ez, zz1=ez*ez+1, xy=fE+ey; | |
3c625a9b | 606 | |
46d29e70 | 607 | fCee += (2*ey*ez*ez*fE+1-ey*ey+ez*ez+fE*fE*ez*ez)*theta2; |
608 | fCte += ez*zz1*xy*theta2; | |
609 | fCtt += zz1*zz1*theta2; | |
b3a5a838 | 610 | fCce += xz*ez*xy*theta2; |
611 | fCct += xz*zz1*theta2; | |
612 | fCcc += xz*xz*theta2; | |
3c625a9b | 613 | /* |
614 | Double_t dc22 = (1-ey*ey+xz*xz*fX*fX)*theta2; | |
615 | Double_t dc32 = (xz*fX*zz1)*theta2; | |
616 | Double_t dc33 = (zz1*zz1)*theta2; | |
617 | Double_t dc42 = (xz*fX*xz)*theta2; | |
618 | Double_t dc43 = (zz1*xz)*theta2; | |
619 | Double_t dc44 = (xz*xz)*theta2; | |
620 | fCee += dc22; | |
621 | fCte += dc32; | |
622 | fCtt += dc33; | |
623 | fCce += dc42; | |
624 | fCct += dc43; | |
625 | fCcc += dc44; | |
626 | */ | |
46d29e70 | 627 | //Energy losses************************ |
b8dc2353 | 628 | if((5940*beta2/(1-beta2+1e-10) - beta2) < 0) return 0; |
5443e65e | 629 | |
c84a5e9e | 630 | Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2+1e-10)) - beta2)*d*rho; |
2276b464 | 631 | Float_t budget = d* rho; |
632 | fBudget[0] +=budget; | |
96c3a73c | 633 | // |
634 | // suspicious part - think about it ? | |
635 | Double_t kinE = TMath::Sqrt(p2); | |
636 | if (dE>0.8*kinE) dE = 0.8*kinE; // | |
637 | if (dE<0) dE = 0.0; // not valid region for Bethe bloch | |
638 | // | |
639 | // | |
3fad3d32 | 640 | fDE+=dE; |
b8dc2353 | 641 | if (x1 < x2) dE=-dE; |
642 | cc=fC; | |
b3a5a838 | 643 | fC*=(1.- sqrt(p2+GetMass()*GetMass())/p2*dE); |
b8dc2353 | 644 | fE+=fX*(fC-cc); |
3fad3d32 | 645 | // Double_t sigmade = 0.1*dE*TMath::Sqrt(TMath::Sqrt(1+fT*fT)*90./(d+0.0001)); // 20 percent fluctuation - normalized to some length |
03b0452e | 646 | Double_t sigmade = 0.07*TMath::Sqrt(TMath::Abs(dE)); // energy loss fluctuation |
3fad3d32 | 647 | Double_t sigmac2 = sigmade*sigmade*fC*fC*(p2+GetMass()*GetMass())/(p2*p2); |
648 | fCcc += sigmac2; | |
649 | fCee += fX*fX*sigmac2; | |
c84a5e9e | 650 | |
0d5b5c27 | 651 | // track time measurement [SR, GSI 17.02.2002] |
0fa7dfa7 | 652 | if (x1 < x2) |
0d5b5c27 | 653 | if (IsStartedTimeIntegral()) { |
03b0452e | 654 | Double_t l2 = TMath::Sqrt((fX-oldX)*(fX-oldX) + (fY-oldY)*(fY-oldY) + (fZ-oldZ)*(fZ-oldZ)); |
655 | if (TMath::Abs(l2*fC)>0.0001){ | |
656 | // make correction for curvature if neccesary | |
657 | l2 = 0.5*TMath::Sqrt((fX-oldX)*(fX-oldX) + (fY-oldY)*(fY-oldY)); | |
658 | l2 = 2*TMath::ASin(l2*fC)/fC; | |
659 | l2 = TMath::Sqrt(l2*l2+(fZ-oldZ)*(fZ-oldZ)); | |
660 | } | |
661 | AddTimeStep(l2); | |
0d5b5c27 | 662 | } |
663 | ||
b8dc2353 | 664 | return 1; |
46d29e70 | 665 | } |
666 | ||
46d29e70 | 667 | //_____________________________________________________________________________ |
53c17fbf | 668 | Int_t AliTRDtrack::Update(const AliTRDcluster *c, Double_t chisq, UInt_t index |
669 | , Double_t h01) | |
46d29e70 | 670 | { |
671 | // Assignes found cluster to the track and updates track information | |
672 | ||
b8dc2353 | 673 | Bool_t fNoTilt = kTRUE; |
674 | if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE; | |
46e2d86c | 675 | // add angular effect to the error contribution - MI |
3c625a9b | 676 | Float_t tangent2 = (fC*fX-fE)*(fC*fX-fE); |
677 | if (tangent2 < 0.90000){ | |
46e2d86c | 678 | tangent2 = tangent2/(1.-tangent2); |
679 | } | |
680 | Float_t errang = tangent2*0.04; // | |
681 | Float_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12.); | |
fd621f36 | 682 | |
46e2d86c | 683 | Double_t r00=c->GetSigmaY2() +errang, r01=0., r11=c->GetSigmaZ2()*100.; |
b8dc2353 | 684 | r00+=fCyy; r01+=fCzy; r11+=fCzz; |
46d29e70 | 685 | Double_t det=r00*r11 - r01*r01; |
686 | Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
687 | ||
b8dc2353 | 688 | Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11; |
689 | Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11; | |
690 | Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11; | |
691 | Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11; | |
692 | Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11; | |
46d29e70 | 693 | |
694 | Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ; | |
b3a5a838 | 695 | Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz; |
fd621f36 | 696 | |
46d29e70 | 697 | |
b8dc2353 | 698 | if(fNoTilt) { |
3c625a9b | 699 | if (TMath::Abs(cur*fX-eta) >= 0.90000) { |
700 | // Int_t n=GetNumberOfClusters(); | |
701 | //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
b8dc2353 | 702 | return 0; |
703 | } | |
704 | fY += k00*dy + k01*dz; | |
705 | fZ += k10*dy + k11*dz; | |
706 | fE = eta; | |
9c9d2487 | 707 | //fT += k30*dy + k31*dz; |
b8dc2353 | 708 | fC = cur; |
709 | } | |
710 | else { | |
53c17fbf | 711 | Double_t xuFactor = 100.; // empirical factor set by C.Xu |
b8dc2353 | 712 | // in the first tilt version |
46e2d86c | 713 | dy=c->GetY() - fY; dz=c->GetZ() - fZ; |
714 | dy=dy+h01*dz; | |
715 | Float_t add=0; | |
716 | if (TMath::Abs(dz)>padlength/2.){ | |
3c625a9b | 717 | Float_t dy2 = c->GetY() - fY; |
718 | Float_t sign = (dz>0) ? -1.: 1.; | |
719 | dy2+=h01*sign*padlength/2.; | |
720 | dy = dy2; | |
721 | add = 0; | |
46e2d86c | 722 | } |
723 | ||
724 | ||
725 | ||
53c17fbf | 726 | r00=c->GetSigmaY2()+errang+add, r01=0., r11=c->GetSigmaZ2()*xuFactor; |
b8dc2353 | 727 | r00+=(fCyy+2.0*h01*fCzy+h01*h01*fCzz); |
1299b231 | 728 | r01+=(fCzy+h01*fCzz); |
729 | r11+=fCzz; | |
46e2d86c | 730 | |
b8dc2353 | 731 | det=r00*r11 - r01*r01; |
732 | tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
733 | ||
734 | k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01); | |
735 | k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01); | |
736 | k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01); | |
737 | k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01); | |
738 | k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01); | |
739 | ||
b8dc2353 | 740 | |
741 | cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz; | |
3c625a9b | 742 | if (TMath::Abs(cur*fX-eta) >= 0.90000) { |
743 | // Int_t n=GetNumberOfClusters(); | |
744 | //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
b8dc2353 | 745 | return 0; |
746 | } | |
747 | fY += k00*dy + k01*dz; | |
748 | fZ += k10*dy + k11*dz; | |
749 | fE = eta; | |
46e2d86c | 750 | fT += k30*dy + k31*dz; |
b8dc2353 | 751 | fC = cur; |
752 | ||
753 | k01+=h01*k00; | |
754 | k11+=h01*k10; | |
755 | k21+=h01*k20; | |
756 | k31+=h01*k30; | |
757 | k41+=h01*k40; | |
46e2d86c | 758 | |
b8dc2353 | 759 | } |
46e2d86c | 760 | Double_t c01=fCzy, c02=fCey, c03=fCty, c04=fCcy; |
761 | Double_t c12=fCez, c13=fCtz, c14=fCcz; | |
762 | ||
b8dc2353 | 763 | |
46d29e70 | 764 | fCyy-=k00*fCyy+k01*fCzy; fCzy-=k00*c01+k01*fCzz; |
b3a5a838 | 765 | fCey-=k00*c02+k01*c12; fCty-=k00*c03+k01*c13; |
766 | fCcy-=k00*c04+k01*c14; | |
b8dc2353 | 767 | |
46d29e70 | 768 | fCzz-=k10*c01+k11*fCzz; |
b3a5a838 | 769 | fCez-=k10*c02+k11*c12; fCtz-=k10*c03+k11*c13; |
770 | fCcz-=k10*c04+k11*c14; | |
b8dc2353 | 771 | |
b3a5a838 | 772 | fCee-=k20*c02+k21*c12; fCte-=k20*c03+k21*c13; |
773 | fCce-=k20*c04+k21*c14; | |
b8dc2353 | 774 | |
b3a5a838 | 775 | fCtt-=k30*c03+k31*c13; |
46e2d86c | 776 | fCct-=k40*c03+k41*c13; |
777 | //fCct-=k30*c04+k31*c14; // symmetric formula MI | |
b8dc2353 | 778 | |
779 | fCcc-=k40*c04+k41*c14; | |
46d29e70 | 780 | |
b8dc2353 | 781 | Int_t n=GetNumberOfClusters(); |
5443e65e | 782 | fIndex[n]=index; |
b8dc2353 | 783 | SetNumberOfClusters(n+1); |
fd621f36 | 784 | |
b8dc2353 | 785 | SetChi2(GetChi2()+chisq); |
46d29e70 | 786 | // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl; |
5443e65e | 787 | |
b8dc2353 | 788 | return 1; |
53c17fbf | 789 | |
46d29e70 | 790 | } |
53c17fbf | 791 | |
46e2d86c | 792 | //_____________________________________________________________________________ |
3c625a9b | 793 | Int_t AliTRDtrack::UpdateMI(const AliTRDcluster *c, Double_t chisq, UInt_t index, Double_t h01, |
4f1c04d3 | 794 | Int_t /*plane*/) |
46e2d86c | 795 | { |
796 | // Assignes found cluster to the track and updates track information | |
797 | ||
798 | Bool_t fNoTilt = kTRUE; | |
799 | if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE; | |
3c625a9b | 800 | // add angular effect to the error contribution and make correction - MI |
c5a8e3df | 801 | //AliTRDclusterCorrection *corrector = AliTRDclusterCorrection::GetCorrection(); |
3c625a9b | 802 | // |
803 | Double_t tangent2 = (fC*fX-fE)*(fC*fX-fE); | |
804 | if (tangent2 < 0.90000){ | |
46e2d86c | 805 | tangent2 = tangent2/(1.-tangent2); |
806 | } | |
3c625a9b | 807 | Double_t tangent = TMath::Sqrt(tangent2); |
808 | if ((fC*fX-fE)<0) tangent*=-1; | |
c84a5e9e | 809 | // Double_t correction = 0*plane; |
810 | Double_t errang = tangent2*0.04; // | |
811 | Double_t errsys =0.025*0.025*20; //systematic error part | |
812 | Float_t extend =1; | |
813 | if (c->GetNPads()==4) extend=2; | |
814 | //if (c->GetNPads()==5) extend=3; | |
815 | //if (c->GetNPads()==6) extend=3; | |
816 | //if (c->GetQ()<15) return 1; | |
4f1c04d3 | 817 | |
c5a8e3df | 818 | /* |
3c625a9b | 819 | if (corrector!=0){ |
820 | //if (0){ | |
821 | correction = corrector->GetCorrection(plane,c->GetLocalTimeBin(),tangent); | |
822 | if (TMath::Abs(correction)>0){ | |
823 | //if we have info | |
824 | errang = corrector->GetSigma(plane,c->GetLocalTimeBin(),tangent); | |
825 | errang *= errang; | |
826 | errang += tangent2*0.04; | |
827 | } | |
828 | } | |
c5a8e3df | 829 | */ |
3c625a9b | 830 | // |
c84a5e9e | 831 | // Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12.); |
832 | ||
833 | Double_t r00=(c->GetSigmaY2() +errang+errsys)*extend, r01=0., r11=c->GetSigmaZ2()*10000.; | |
46e2d86c | 834 | r00+=fCyy; r01+=fCzy; r11+=fCzz; |
835 | Double_t det=r00*r11 - r01*r01; | |
836 | Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
837 | ||
838 | Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11; | |
839 | Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11; | |
840 | Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11; | |
841 | Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11; | |
842 | Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11; | |
843 | ||
844 | Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ; | |
845 | Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz; | |
846 | ||
847 | ||
848 | if(fNoTilt) { | |
3c625a9b | 849 | if (TMath::Abs(cur*fX-eta) >= 0.90000) { |
850 | // Int_t n=GetNumberOfClusters(); | |
851 | //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
46e2d86c | 852 | return 0; |
853 | } | |
854 | fY += k00*dy + k01*dz; | |
855 | fZ += k10*dy + k11*dz; | |
856 | fE = eta; | |
857 | //fT += k30*dy + k31*dz; | |
858 | fC = cur; | |
859 | } | |
860 | else { | |
c84a5e9e | 861 | Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12); |
4f1c04d3 | 862 | |
53c17fbf | 863 | Double_t xuFactor = 1000.; // empirical factor set by C.Xu |
46e2d86c | 864 | // in the first tilt version |
865 | dy=c->GetY() - fY; dz=c->GetZ() - fZ; | |
c84a5e9e | 866 | //dy=dy+h01*dz+correction; |
4f1c04d3 | 867 | |
868 | Double_t tiltdz = dz; | |
c84a5e9e | 869 | if (TMath::Abs(tiltdz)>padlength/2.) { |
870 | tiltdz = TMath::Sign(padlength/2,dz); | |
871 | } | |
872 | // dy=dy+h01*dz; | |
4f1c04d3 | 873 | dy=dy+h01*tiltdz; |
874 | ||
c84a5e9e | 875 | Double_t add=0; |
876 | if (TMath::Abs(dz)>padlength/2.){ | |
877 | //Double_t dy2 = c->GetY() - fY; | |
878 | //Double_t sign = (dz>0) ? -1.: 1.; | |
879 | //dy2-=h01*sign*padlength/2.; | |
880 | //dy = dy2; | |
881 | add =1; | |
882 | } | |
883 | Double_t s00 = (c->GetSigmaY2()+errang)*extend+errsys+add; // error pad | |
53c17fbf | 884 | Double_t s11 = c->GetSigmaZ2()*xuFactor; // error pad-row |
46e2d86c | 885 | // |
886 | r00 = fCyy + 2*fCzy*h01 + fCzz*h01*h01+s00; | |
887 | r01 = fCzy + fCzz*h01; | |
888 | r11 = fCzz + s11; | |
889 | det = r00*r11 - r01*r01; | |
890 | // inverse matrix | |
891 | tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
892 | ||
893 | // K matrix | |
894 | k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01); | |
895 | k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01); | |
896 | k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01); | |
897 | k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01); | |
898 | k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01); | |
899 | // | |
900 | //Update measurement | |
901 | cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz; | |
3c625a9b | 902 | if (TMath::Abs(cur*fX-eta) >= 0.90000) { |
903 | //Int_t n=GetNumberOfClusters(); | |
904 | // if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
46e2d86c | 905 | return 0; |
906 | } | |
907 | fY += k00*dy + k01*dz; | |
908 | fZ += k10*dy + k11*dz; | |
909 | fE = eta; | |
910 | fT += k30*dy + k31*dz; | |
911 | fC = cur; | |
912 | ||
913 | k01+=h01*k00; | |
914 | k11+=h01*k10; | |
915 | k21+=h01*k20; | |
916 | k31+=h01*k30; | |
917 | k41+=h01*k40; | |
918 | ||
919 | } | |
920 | //Update covariance | |
921 | // | |
922 | // | |
923 | Double_t oldyy = fCyy, oldzz = fCzz; //, oldee=fCee, oldcc =fCcc; | |
924 | Double_t oldzy = fCzy, oldey = fCey, oldty=fCty, oldcy =fCcy; | |
925 | Double_t oldez = fCez, oldtz = fCtz, oldcz=fCcz; | |
926 | //Double_t oldte = fCte, oldce = fCce; | |
927 | //Double_t oldct = fCct; | |
928 | ||
929 | fCyy-=k00*oldyy+k01*oldzy; | |
930 | fCzy-=k10*oldyy+k11*oldzy; | |
931 | fCey-=k20*oldyy+k21*oldzy; | |
932 | fCty-=k30*oldyy+k31*oldzy; | |
933 | fCcy-=k40*oldyy+k41*oldzy; | |
934 | // | |
935 | fCzz-=k10*oldzy+k11*oldzz; | |
936 | fCez-=k20*oldzy+k21*oldzz; | |
937 | fCtz-=k30*oldzy+k31*oldzz; | |
938 | fCcz-=k40*oldzy+k41*oldzz; | |
939 | // | |
940 | fCee-=k20*oldey+k21*oldez; | |
941 | fCte-=k30*oldey+k31*oldez; | |
942 | fCce-=k40*oldey+k41*oldez; | |
943 | // | |
944 | fCtt-=k30*oldty+k31*oldtz; | |
945 | fCct-=k40*oldty+k41*oldtz; | |
946 | // | |
947 | fCcc-=k40*oldcy+k41*oldcz; | |
948 | // | |
949 | ||
950 | Int_t n=GetNumberOfClusters(); | |
951 | fIndex[n]=index; | |
952 | SetNumberOfClusters(n+1); | |
953 | ||
954 | SetChi2(GetChi2()+chisq); | |
955 | // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl; | |
956 | ||
957 | return 1; | |
7ad19338 | 958 | |
53c17fbf | 959 | } |
7ad19338 | 960 | |
7ad19338 | 961 | //_____________________________________________________________________________ |
962 | Int_t AliTRDtrack::UpdateMI(const AliTRDtracklet &tracklet) | |
963 | { | |
964 | // | |
965 | // Assignes found tracklet to the track and updates track information | |
966 | // | |
967 | // | |
968 | Double_t r00=(tracklet.GetTrackletSigma2()), r01=0., r11= 10000.; | |
969 | r00+=fCyy; r01+=fCzy; r11+=fCzz; | |
970 | // | |
971 | Double_t det=r00*r11 - r01*r01; | |
972 | Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
973 | // | |
974 | ||
975 | Double_t dy=tracklet.GetY() - fY, dz=tracklet.GetZ() - fZ; | |
976 | ||
977 | ||
978 | Double_t s00 = tracklet.GetTrackletSigma2(); // error pad | |
979 | Double_t s11 = 100000; // error pad-row | |
980 | Float_t h01 = tracklet.GetTilt(); | |
981 | // | |
982 | // r00 = fCyy + 2*fCzy*h01 + fCzz*h01*h01+s00; | |
983 | r00 = fCyy + fCzz*h01*h01+s00; | |
984 | // r01 = fCzy + fCzz*h01; | |
985 | r01 = fCzy ; | |
986 | r11 = fCzz + s11; | |
987 | det = r00*r11 - r01*r01; | |
988 | // inverse matrix | |
989 | tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
990 | ||
991 | Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11; | |
992 | Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11; | |
993 | Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11; | |
994 | Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11; | |
995 | Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11; | |
996 | ||
997 | // K matrix | |
998 | // k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01); | |
999 | // k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01); | |
1000 | // k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01); | |
1001 | // k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01); | |
1002 | // k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01); | |
1003 | // | |
1004 | //Update measurement | |
1005 | Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz; | |
1006 | // cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz; | |
1007 | if (TMath::Abs(cur*fX-eta) >= 0.90000) { | |
1008 | //Int_t n=GetNumberOfClusters(); | |
1009 | // if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
1010 | return 0; | |
1011 | } | |
1012 | // k01+=h01*k00; | |
1013 | // k11+=h01*k10; | |
1014 | // k21+=h01*k20; | |
1015 | // k31+=h01*k30; | |
1016 | // k41+=h01*k40; | |
1017 | ||
1018 | ||
1019 | fY += k00*dy + k01*dz; | |
1020 | fZ += k10*dy + k11*dz; | |
1021 | fE = eta; | |
1022 | fT += k30*dy + k31*dz; | |
1023 | fC = cur; | |
1024 | ||
1025 | ||
1026 | //Update covariance | |
1027 | // | |
1028 | // | |
1029 | Double_t oldyy = fCyy, oldzz = fCzz; //, oldee=fCee, oldcc =fCcc; | |
1030 | Double_t oldzy = fCzy, oldey = fCey, oldty=fCty, oldcy =fCcy; | |
1031 | Double_t oldez = fCez, oldtz = fCtz, oldcz=fCcz; | |
1032 | //Double_t oldte = fCte, oldce = fCce; | |
1033 | //Double_t oldct = fCct; | |
1034 | ||
1035 | fCyy-=k00*oldyy+k01*oldzy; | |
1036 | fCzy-=k10*oldyy+k11*oldzy; | |
1037 | fCey-=k20*oldyy+k21*oldzy; | |
1038 | fCty-=k30*oldyy+k31*oldzy; | |
1039 | fCcy-=k40*oldyy+k41*oldzy; | |
1040 | // | |
1041 | fCzz-=k10*oldzy+k11*oldzz; | |
1042 | fCez-=k20*oldzy+k21*oldzz; | |
1043 | fCtz-=k30*oldzy+k31*oldzz; | |
1044 | fCcz-=k40*oldzy+k41*oldzz; | |
1045 | // | |
1046 | fCee-=k20*oldey+k21*oldez; | |
1047 | fCte-=k30*oldey+k31*oldez; | |
1048 | fCce-=k40*oldey+k41*oldez; | |
1049 | // | |
1050 | fCtt-=k30*oldty+k31*oldtz; | |
1051 | fCct-=k40*oldty+k41*oldtz; | |
1052 | // | |
1053 | fCcc-=k40*oldcy+k41*oldcz; | |
1054 | // | |
1055 | /* | |
1056 | Int_t n=GetNumberOfClusters(); | |
1057 | fIndex[n]=index; | |
1058 | SetNumberOfClusters(n+1); | |
1059 | ||
1060 | SetChi2(GetChi2()+chisq); | |
1061 | // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl; | |
1062 | */ | |
7ad19338 | 1063 | |
53c17fbf | 1064 | return 1; |
7ad19338 | 1065 | |
53c17fbf | 1066 | } |
c84a5e9e | 1067 | |
46d29e70 | 1068 | //_____________________________________________________________________________ |
3fad3d32 | 1069 | Int_t AliTRDtrack::Rotate(Double_t alpha, Bool_t absolute) |
46d29e70 | 1070 | { |
1071 | // Rotates track parameters in R*phi plane | |
3fad3d32 | 1072 | // if absolute rotation alpha is in global system |
1073 | // otherwise alpha rotation is relative to the current rotation angle | |
9c9d2487 | 1074 | |
3fad3d32 | 1075 | if (absolute) { |
1076 | alpha -= fAlpha; | |
1077 | } | |
1078 | else{ | |
1079 | fNRotate++; | |
1080 | } | |
46d29e70 | 1081 | |
1082 | fAlpha += alpha; | |
b3a5a838 | 1083 | if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi(); |
b8dc2353 | 1084 | if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi(); |
46d29e70 | 1085 | |
1086 | Double_t x1=fX, y1=fY; | |
1087 | Double_t ca=cos(alpha), sa=sin(alpha); | |
1088 | Double_t r1=fC*fX - fE; | |
1089 | ||
1090 | fX = x1*ca + y1*sa; | |
b8dc2353 | 1091 | fY =-x1*sa + y1*ca; |
1092 | if((r1*r1) > 1) return 0; | |
46d29e70 | 1093 | fE=fE*ca + (fC*y1 + sqrt(1.- r1*r1))*sa; |
1094 | ||
1095 | Double_t r2=fC*fX - fE; | |
3c625a9b | 1096 | if (TMath::Abs(r2) >= 0.90000) { |
b8dc2353 | 1097 | Int_t n=GetNumberOfClusters(); |
5443e65e | 1098 | if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !\n"; |
46d29e70 | 1099 | return 0; |
1100 | } | |
1101 | ||
b8dc2353 | 1102 | if((r2*r2) > 1) return 0; |
46d29e70 | 1103 | Double_t y0=fY + sqrt(1.- r2*r2)/fC; |
1104 | if ((fY-y0)*fC >= 0.) { | |
b8dc2353 | 1105 | Int_t n=GetNumberOfClusters(); |
5443e65e | 1106 | if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !!!\n"; |
46d29e70 | 1107 | return 0; |
1108 | } | |
1109 | ||
1110 | //f = F - 1 | |
b3a5a838 | 1111 | Double_t f00=ca-1, f24=(y1 - r1*x1/sqrt(1.- r1*r1))*sa, |
b8dc2353 | 1112 | f20=fC*sa, f22=(ca + sa*r1/sqrt(1.- r1*r1))-1; |
46d29e70 | 1113 | |
1114 | //b = C*ft | |
b3a5a838 | 1115 | Double_t b00=fCyy*f00, b02=fCyy*f20+fCcy*f24+fCey*f22; |
1116 | Double_t b10=fCzy*f00, b12=fCzy*f20+fCcz*f24+fCez*f22; | |
1117 | Double_t b20=fCey*f00, b22=fCey*f20+fCce*f24+fCee*f22; | |
1118 | Double_t b30=fCty*f00, b32=fCty*f20+fCct*f24+fCte*f22; | |
1119 | Double_t b40=fCcy*f00, b42=fCcy*f20+fCcc*f24+fCce*f22; | |
46d29e70 | 1120 | |
1121 | //a = f*b = f*C*ft | |
b3a5a838 | 1122 | Double_t a00=f00*b00, a02=f00*b02, a22=f20*b02+f24*b42+f22*b22; |
46d29e70 | 1123 | |
46d29e70 | 1124 | //F*C*Ft = C + (a + b + bt) |
1125 | fCyy += a00 + 2*b00; | |
1126 | fCzy += b10; | |
b3a5a838 | 1127 | fCey += a02+b20+b02; |
1128 | fCty += b30; | |
1129 | fCcy += b40; | |
1130 | fCez += b12; | |
1131 | fCte += b32; | |
1132 | fCee += a22 + 2*b22; | |
1133 | fCce += b42; | |
46d29e70 | 1134 | |
b8dc2353 | 1135 | return 1; |
46d29e70 | 1136 | |
53c17fbf | 1137 | } |
7ad19338 | 1138 | |
46d29e70 | 1139 | //_____________________________________________________________________________ |
fd621f36 | 1140 | Double_t AliTRDtrack::GetPredictedChi2(const AliTRDcluster *c, Double_t h01) const |
46d29e70 | 1141 | { |
53c17fbf | 1142 | // |
1143 | // Returns the track chi2 | |
1144 | // | |
1145 | ||
b8dc2353 | 1146 | Bool_t fNoTilt = kTRUE; |
1147 | if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE; | |
1148 | Double_t chi2, dy, r00, r01, r11; | |
1149 | ||
1150 | if(fNoTilt) { | |
1151 | dy=c->GetY() - fY; | |
1152 | r00=c->GetSigmaY2(); | |
1153 | chi2 = (dy*dy)/r00; | |
46d29e70 | 1154 | } |
b8dc2353 | 1155 | else { |
4f1c04d3 | 1156 | Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12); |
1157 | // | |
b8dc2353 | 1158 | r00=c->GetSigmaY2(); r01=0.; r11=c->GetSigmaZ2(); |
1159 | r00+=fCyy; r01+=fCzy; r11+=fCzz; | |
1160 | ||
1161 | Double_t det=r00*r11 - r01*r01; | |
1162 | if (TMath::Abs(det) < 1.e-10) { | |
1163 | Int_t n=GetNumberOfClusters(); | |
1164 | if (n>4) cerr<<n<<" AliTRDtrack warning: Singular matrix !\n"; | |
1165 | return 1e10; | |
1166 | } | |
1167 | Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01; | |
1168 | Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ; | |
4f1c04d3 | 1169 | Double_t tiltdz = dz; |
1170 | if (TMath::Abs(tiltdz)>padlength/2.) { | |
1171 | tiltdz = TMath::Sign(padlength/2,dz); | |
1172 | } | |
1173 | // dy=dy+h01*dz; | |
1174 | dy=dy+h01*tiltdz; | |
a819a5f7 | 1175 | |
b8dc2353 | 1176 | chi2 = (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det; |
1177 | } | |
53c17fbf | 1178 | |
b8dc2353 | 1179 | return chi2; |
46d29e70 | 1180 | |
53c17fbf | 1181 | } |
7ad19338 | 1182 | |
46d29e70 | 1183 | //_________________________________________________________________________ |
1184 | void AliTRDtrack::GetPxPyPz(Double_t& px, Double_t& py, Double_t& pz) const | |
1185 | { | |
1186 | // Returns reconstructed track momentum in the global system. | |
1187 | ||
1188 | Double_t pt=TMath::Abs(GetPt()); // GeV/c | |
1189 | Double_t r=fC*fX-fE; | |
5443e65e | 1190 | |
1191 | Double_t y0; | |
1192 | if(r > 1) { py = pt; px = 0; } | |
1193 | else if(r < -1) { py = -pt; px = 0; } | |
1194 | else { | |
1195 | y0=fY + sqrt(1.- r*r)/fC; | |
1196 | px=-pt*(fY-y0)*fC; //cos(phi); | |
1197 | py=-pt*(fE-fX*fC); //sin(phi); | |
1198 | } | |
46d29e70 | 1199 | pz=pt*fT; |
1200 | Double_t tmp=px*TMath::Cos(fAlpha) - py*TMath::Sin(fAlpha); | |
1201 | py=px*TMath::Sin(fAlpha) + py*TMath::Cos(fAlpha); | |
1202 | px=tmp; | |
1203 | ||
1204 | } | |
1205 | ||
5443e65e | 1206 | //_________________________________________________________________________ |
1207 | void AliTRDtrack::GetGlobalXYZ(Double_t& x, Double_t& y, Double_t& z) const | |
46d29e70 | 1208 | { |
5443e65e | 1209 | // Returns reconstructed track coordinates in the global system. |
1210 | ||
1211 | x = fX; y = fY; z = fZ; | |
1212 | Double_t tmp=x*TMath::Cos(fAlpha) - y*TMath::Sin(fAlpha); | |
1213 | y=x*TMath::Sin(fAlpha) + y*TMath::Cos(fAlpha); | |
1214 | x=tmp; | |
1215 | ||
1216 | } | |
3ab6f951 | 1217 | |
5443e65e | 1218 | //_________________________________________________________________________ |
53c17fbf | 1219 | void AliTRDtrack::ResetCovariance() |
1220 | { | |
5443e65e | 1221 | // |
1222 | // Resets covariance matrix | |
1223 | // | |
46d29e70 | 1224 | |
5443e65e | 1225 | fCyy*=10.; |
b8dc2353 | 1226 | fCzy=0.; fCzz*=10.; |
1227 | fCey=0.; fCez=0.; fCee*=10.; | |
1228 | fCty=0.; fCtz=0.; fCte=0.; fCtt*=10.; | |
1229 | fCcy=0.; fCcz=0.; fCce=0.; fCct=0.; fCcc*=10.; | |
53c17fbf | 1230 | |
5443e65e | 1231 | } |
b8dc2353 | 1232 | |
53c17fbf | 1233 | //_____________________________________________________________________________ |
1234 | void AliTRDtrack::ResetCovariance(Float_t mult) | |
1235 | { | |
46e2d86c | 1236 | // |
1237 | // Resets covariance matrix | |
1238 | // | |
1239 | ||
1240 | fCyy*=mult; | |
4f1c04d3 | 1241 | fCzy*=0.; fCzz*=1.; |
3c625a9b | 1242 | fCey*=0.; fCez*=0.; fCee*=mult; |
4f1c04d3 | 1243 | fCty*=0.; fCtz*=0.; fCte*=0.; fCtt*=1.; |
3c625a9b | 1244 | fCcy*=0.; fCcz*=0.; fCce*=0.; fCct*=0.; fCcc*=mult; |
7ad19338 | 1245 | |
53c17fbf | 1246 | } |
7ad19338 | 1247 | |
53c17fbf | 1248 | //_____________________________________________________________________________ |
16d9fbba | 1249 | void AliTRDtrack::MakeBackupTrack() |
1250 | { | |
1251 | // | |
53c17fbf | 1252 | // Creates a backup track |
16d9fbba | 1253 | // |
53c17fbf | 1254 | |
16d9fbba | 1255 | if (fBackupTrack) delete fBackupTrack; |
1256 | fBackupTrack = new AliTRDtrack(*this); | |
4f1c04d3 | 1257 | |
1258 | } | |
1259 | ||
53c17fbf | 1260 | //_____________________________________________________________________________ |
1261 | Int_t AliTRDtrack::GetProlongation(Double_t xk, Double_t &y, Double_t &z) | |
1262 | { | |
4f1c04d3 | 1263 | // |
1264 | // Find prolongation at given x | |
1265 | // return 0 if not exist | |
1266 | ||
1267 | Double_t c1=fC*fX - fE; | |
c84a5e9e | 1268 | if (TMath::Abs(c1)>1.) return 0; |
4f1c04d3 | 1269 | Double_t r1=TMath::Sqrt(1.- c1*c1); |
1270 | Double_t c2=fC*xk - fE; | |
c84a5e9e | 1271 | if (TMath::Abs(c2)>1.) return 0; |
4f1c04d3 | 1272 | Double_t r2=TMath::Sqrt(1.- c2*c2); |
1273 | y =fY + (xk-fX)*(c1+c2)/(r1+r2); | |
1274 | z =fZ + (xk-fX)*(c1+c2)/(c1*r2 + c2*r1)*fT; | |
1275 | ||
1276 | return 1; | |
1277 | ||
16d9fbba | 1278 | } |
3fad3d32 | 1279 | |
53c17fbf | 1280 | //_____________________________________________________________________________ |
3fad3d32 | 1281 | Int_t AliTRDtrack::PropagateToX(Double_t xr, Double_t step) |
1282 | { | |
1283 | // | |
1284 | // Propagate track to given x position | |
1285 | // works inside of the 20 degree segmentation (local cooordinate frame for TRD , TPC, TOF) | |
1286 | // | |
1287 | // material budget from geo manager | |
1288 | // | |
1289 | Double_t xyz0[3], xyz1[3],y,z; | |
53c17fbf | 1290 | const Double_t kAlphac = TMath::Pi()/9.; |
1291 | const Double_t kTalphac = TMath::Tan(kAlphac*0.5); | |
3fad3d32 | 1292 | // critical alpha - cross sector indication |
1293 | // | |
1294 | Double_t dir = (fX>xr) ? -1.:1.; | |
1295 | // direction +- | |
1296 | for (Double_t x=fX+dir*step;dir*x<dir*xr;x+=dir*step){ | |
1297 | // | |
1298 | GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]); | |
1299 | GetProlongation(x,y,z); | |
1300 | xyz1[0] = x*TMath::Cos(fAlpha)+y*TMath::Sin(fAlpha); | |
1301 | xyz1[1] = x*TMath::Sin(fAlpha)-y*TMath::Cos(fAlpha); | |
1302 | xyz1[2] = z; | |
1303 | Double_t param[7]; | |
1304 | AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param); | |
1305 | // | |
1306 | if (param[0]>0&¶m[1]>0) PropagateTo(x,param[1],param[0]); | |
53c17fbf | 1307 | if (fY>fX*kTalphac){ |
1308 | Rotate(-kAlphac); | |
3fad3d32 | 1309 | } |
53c17fbf | 1310 | if (fY<-fX*kTalphac){ |
1311 | Rotate(kAlphac); | |
3fad3d32 | 1312 | } |
1313 | } | |
1314 | // | |
1315 | PropagateTo(xr); | |
53c17fbf | 1316 | |
3fad3d32 | 1317 | return 0; |
3fad3d32 | 1318 | |
53c17fbf | 1319 | } |
3fad3d32 | 1320 | |
53c17fbf | 1321 | //_____________________________________________________________________________ |
3fad3d32 | 1322 | Int_t AliTRDtrack::PropagateToR(Double_t r,Double_t step) |
1323 | { | |
1324 | // | |
1325 | // propagate track to the radial position | |
1326 | // rotation always connected to the last track position | |
1327 | // | |
1328 | Double_t xyz0[3], xyz1[3],y,z; | |
1329 | Double_t radius = TMath::Sqrt(fX*fX+fY*fY); | |
1330 | Double_t dir = (radius>r) ? -1.:1.; // direction +- | |
1331 | // | |
1332 | for (Double_t x=radius+dir*step;dir*x<dir*r;x+=dir*step){ | |
1333 | GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]); | |
1334 | Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]); | |
1335 | Rotate(alpha,kTRUE); | |
1336 | GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]); | |
1337 | GetProlongation(x,y,z); | |
1338 | xyz1[0] = x*TMath::Cos(alpha)+y*TMath::Sin(alpha); | |
1339 | xyz1[1] = x*TMath::Sin(alpha)-y*TMath::Cos(alpha); | |
1340 | xyz1[2] = z; | |
1341 | Double_t param[7]; | |
1342 | AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param); | |
1343 | if (param[1]<=0) param[1] =100000000; | |
1344 | PropagateTo(x,param[1],param[0]); | |
1345 | } | |
1346 | GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]); | |
1347 | Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]); | |
1348 | Rotate(alpha,kTRUE); | |
1349 | GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]); | |
1350 | GetProlongation(r,y,z); | |
1351 | xyz1[0] = r*TMath::Cos(alpha)+y*TMath::Sin(alpha); | |
1352 | xyz1[1] = r*TMath::Sin(alpha)-y*TMath::Cos(alpha); | |
1353 | xyz1[2] = z; | |
1354 | Double_t param[7]; | |
1355 | AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param); | |
1356 | // | |
1357 | if (param[1]<=0) param[1] =100000000; | |
1358 | PropagateTo(r,param[1],param[0]); | |
53c17fbf | 1359 | |
3fad3d32 | 1360 | return 0; |
53c17fbf | 1361 | |
1362 | } | |
1363 | ||
1364 | //_____________________________________________________________________________ | |
4e28c495 | 1365 | Int_t AliTRDtrack::GetSector() const |
53c17fbf | 1366 | { |
1367 | // | |
1368 | // Return the current sector | |
1369 | // | |
1370 | ||
1371 | return Int_t(TVector2::Phi_0_2pi(fAlpha) | |
1372 | / AliTRDgeometry::GetAlpha()) | |
1373 | % AliTRDgeometry::kNsect; | |
1374 | ||
3fad3d32 | 1375 | } |
1376 | ||
53c17fbf | 1377 | //_____________________________________________________________________________ |
4e28c495 | 1378 | Double_t AliTRDtrack::Get1Pt() const |
53c17fbf | 1379 | { |
1380 | // | |
1381 | // Returns 1 / pt | |
1382 | // | |
3fad3d32 | 1383 | |
53c17fbf | 1384 | return (TMath::Sign(1e-9,fC) + fC)*GetLocalConvConst(); |
1385 | ||
1386 | } | |
1387 | ||
1388 | //_____________________________________________________________________________ | |
4e28c495 | 1389 | Double_t AliTRDtrack::GetP() const |
53c17fbf | 1390 | { |
1391 | // | |
1392 | // Returns the total momentum | |
1393 | // | |
1394 | ||
1395 | return TMath::Abs(GetPt())*sqrt(1.+GetTgl()*GetTgl()); | |
1396 | ||
1397 | } | |
1398 | ||
1399 | //_____________________________________________________________________________ | |
4e28c495 | 1400 | Double_t AliTRDtrack::GetYat(Double_t xk) const |
53c17fbf | 1401 | { |
1402 | // | |
1403 | // This function calculates the Y-coordinate of a track at | |
1404 | // the plane x = xk. | |
1405 | // Needed for matching with the TOF (I.Belikov) | |
1406 | // | |
1407 | ||
1408 | Double_t c1 = fC*fX - fE; | |
1409 | Double_t r1 = TMath::Sqrt(1.0 - c1*c1); | |
1410 | Double_t c2 = fC*xk - fE; | |
1411 | Double_t r2 = TMath::Sqrt(1.0- c2*c2); | |
1412 | return fY + (xk-fX)*(c1+c2)/(r1+r2); | |
1413 | ||
1414 | } | |
1415 | ||
1416 | //_____________________________________________________________________________ | |
4e28c495 | 1417 | void AliTRDtrack::SetSampledEdx(Float_t q, Int_t i) |
53c17fbf | 1418 | { |
1419 | // | |
1420 | // The sampled energy loss | |
1421 | // | |
1422 | ||
1423 | Double_t s = GetSnp(); | |
1424 | Double_t t = GetTgl(); | |
1425 | q *= TMath::Sqrt((1-s*s)/(1+t*t)); | |
1426 | fdQdl[i] = q; | |
1427 | ||
1428 | } | |
1429 | ||
1430 | //_____________________________________________________________________________ | |
4e28c495 | 1431 | void AliTRDtrack::SetSampledEdx(Float_t q) |
53c17fbf | 1432 | { |
1433 | // | |
1434 | // The sampled energy loss | |
1435 | // | |
1436 | ||
1437 | Double_t s = GetSnp(); | |
1438 | Double_t t = GetTgl(); | |
1439 | q*= TMath::Sqrt((1-s*s)/(1+t*t)); | |
1440 | fdQdl[fNdedx] = q; | |
1441 | fNdedx++; | |
1442 | ||
1443 | } | |
1444 | ||
1445 | //_____________________________________________________________________________ | |
4e28c495 | 1446 | void AliTRDtrack::GetXYZ(Float_t r[3]) const |
53c17fbf | 1447 | { |
1448 | ||
1449 | //--------------------------------------------------------------------- | |
1450 | // Returns the position of the track in the global coord. system | |
1451 | //--------------------------------------------------------------------- | |
1452 | ||
1453 | Double_t cs = TMath::Cos(fAlpha); | |
1454 | Double_t sn = TMath::Sin(fAlpha); | |
1455 | r[0] = fX*cs - fY*sn; | |
1456 | r[1] = fX*sn + fY*cs; | |
1457 | r[2] = fZ; | |
1458 | ||
1459 | } |