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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 | /* $Id$ */ | |
17 | ||
18 | #include <Riostream.h> | |
19 | #include <TMath.h> | |
20 | #include <TVector2.h> | |
21 | ||
22 | #include "AliESDtrack.h" | |
23 | #include "AliTRDgeometry.h" | |
24 | #include "AliTRDcluster.h" | |
25 | #include "AliTRDtrack.h" | |
26 | #include "AliTRDtracklet.h" | |
27 | ||
28 | ClassImp(AliTRDtrack) | |
29 | ||
30 | /////////////////////////////////////////////////////////////////////////////// | |
31 | // // | |
32 | // Represents a reconstructed TRD track // | |
33 | // Local TRD Kalman track // | |
34 | // // | |
35 | /////////////////////////////////////////////////////////////////////////////// | |
36 | ||
37 | AliTRDtrack::AliTRDtrack(): | |
38 | AliKalmanTrack(), | |
39 | fSeedLab(-1), | |
40 | fdEdx(0), | |
41 | fdEdxT(0), | |
42 | fDE(0), | |
43 | fAlpha(0), | |
44 | fX(0), | |
45 | fStopped(kFALSE), | |
46 | fY(0), | |
47 | fZ(0), | |
48 | fE(0), | |
49 | fT(0), | |
50 | fC(0), | |
51 | fCyy(1e10), | |
52 | fCzy(0), | |
53 | fCzz(1e10), | |
54 | fCey(0), | |
55 | fCez(0), | |
56 | fCee(1e10), | |
57 | fCty(0), | |
58 | fCtz(0), | |
59 | fCte(0), | |
60 | fCtt(1e10), | |
61 | fCcy(0), | |
62 | fCcz(0), | |
63 | fCce(0), | |
64 | fCct(0), | |
65 | fCcc(1e10), | |
66 | fLhElectron(0), | |
67 | fNWrong(0), | |
68 | fNRotate(0), | |
69 | fNCross(0), | |
70 | fNExpected(0), | |
71 | fNLast(0), | |
72 | fNExpectedLast(0), | |
73 | fNdedx(0), | |
74 | fChi2Last(1e10), | |
75 | fBackupTrack(0x0) | |
76 | ||
77 | { | |
78 | for (Int_t i=0; i<kNplane; i++) { | |
79 | fdEdxPlane[i] = 0; | |
80 | fTimBinPlane[i] = -1; | |
81 | } | |
82 | for (UInt_t i=0; i<kMAXCLUSTERSPERTRACK; i++) { | |
83 | fIndex[i] = 0; | |
84 | fIndexBackup[i] = 0; | |
85 | fdQdl[i] = 0; | |
86 | } | |
87 | for (Int_t i=0; i<3; i++) fBudget[i] = 0; | |
88 | } | |
89 | //_____________________________________________________________________________ | |
90 | AliTRDtrack::AliTRDtrack(const AliTRDcluster *c, UInt_t index, | |
91 | const Double_t xx[5], const Double_t cc[15], | |
92 | Double_t xref, Double_t alpha) : AliKalmanTrack() { | |
93 | //----------------------------------------------------------------- | |
94 | // This is the main track constructor. | |
95 | //----------------------------------------------------------------- | |
96 | ||
97 | fSeedLab = -1; | |
98 | ||
99 | fAlpha=alpha; | |
100 | if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
101 | if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
102 | ||
103 | fX=xref; | |
104 | ||
105 | fY=xx[0]; fZ=xx[1]; fE=xx[2]; fT=xx[3]; fC=xx[4]; | |
106 | ||
107 | SaveLocalConvConst(); | |
108 | ||
109 | fCyy=cc[0]; | |
110 | fCzy=cc[1]; fCzz=cc[2]; | |
111 | fCey=cc[3]; fCez=cc[4]; fCee=cc[5]; | |
112 | fCty=cc[6]; fCtz=cc[7]; fCte=cc[8]; fCtt=cc[9]; | |
113 | fCcy=cc[10]; fCcz=cc[11]; fCce=cc[12]; fCct=cc[13]; fCcc=cc[14]; | |
114 | ||
115 | fIndex[0]=index; | |
116 | SetNumberOfClusters(1); | |
117 | ||
118 | fdEdx=0.; | |
119 | fdEdxT=0.; | |
120 | fDE=0.; | |
121 | for (Int_t i=0;i<kNplane;i++){ | |
122 | fdEdxPlane[i] = 0.; | |
123 | fTimBinPlane[i] = -1; | |
124 | } | |
125 | ||
126 | fLhElectron = 0.0; | |
127 | fNWrong = 0; | |
128 | fNRotate = 0; | |
129 | fStopped = 0; | |
130 | fNCross =0; | |
131 | fNLast =0; | |
132 | fChi2Last=0; | |
133 | fNExpected=0; | |
134 | fNExpectedLast=0; | |
135 | fNdedx=0; | |
136 | Double_t q = TMath::Abs(c->GetQ()); | |
137 | Double_t s = fX*fC - fE, t=fT; | |
138 | if(s*s < 1) q *= TMath::Sqrt((1-s*s)/(1+t*t)); | |
139 | ||
140 | fdQdl[0] = q; | |
141 | ||
142 | // initialisation [SR, GSI 18.02.2003] (i startd for 1) | |
143 | for(UInt_t i=1; i<kMAXCLUSTERSPERTRACK; i++) { | |
144 | fdQdl[i] = 0; | |
145 | fIndex[i] = 0; | |
146 | fIndexBackup[i] = 0; //backup indexes MI | |
147 | } | |
148 | for (Int_t i=0;i<3;i++) { fBudget[i]=0;}; | |
149 | ||
150 | fBackupTrack = 0; | |
151 | ||
152 | } | |
153 | ||
154 | //_____________________________________________________________________________ | |
155 | AliTRDtrack::AliTRDtrack(const AliTRDtrack& t) : AliKalmanTrack(t) | |
156 | { | |
157 | // | |
158 | // Copy constructor. | |
159 | // | |
160 | ||
161 | SetLabel(t.GetLabel()); | |
162 | fSeedLab=t.GetSeedLabel(); | |
163 | ||
164 | SetChi2(t.GetChi2()); | |
165 | fdEdx=t.fdEdx; | |
166 | fdEdxT=t.fdEdxT; | |
167 | fDE=t.fDE; | |
168 | for (Int_t i=0;i<kNplane;i++){ | |
169 | fdEdxPlane[i] = t.fdEdxPlane[i]; | |
170 | fTimBinPlane[i] = t.fTimBinPlane[i]; | |
171 | fTracklets[i] = t.fTracklets[i]; | |
172 | } | |
173 | ||
174 | fLhElectron = 0.0; | |
175 | fNWrong = t.fNWrong; | |
176 | fNRotate = t.fNRotate; | |
177 | fStopped = t.fStopped; | |
178 | fNCross = t.fNCross; | |
179 | fNExpected = t.fNExpected; | |
180 | fNExpectedLast = t.fNExpectedLast; | |
181 | fNdedx = t.fNdedx; | |
182 | fNLast = t.fNLast; | |
183 | fChi2Last = t.fChi2Last; | |
184 | fBackupTrack =0; | |
185 | fAlpha=t.fAlpha; | |
186 | fX=t.fX; | |
187 | ||
188 | ||
189 | fY=t.fY; fZ=t.fZ; fE=t.fE; fT=t.fT; fC=t.fC; | |
190 | ||
191 | fCyy=t.fCyy; | |
192 | fCzy=t.fCzy; fCzz=t.fCzz; | |
193 | fCey=t.fCey; fCez=t.fCez; fCee=t.fCee; | |
194 | fCty=t.fCty; fCtz=t.fCtz; fCte=t.fCte; fCtt=t.fCtt; | |
195 | fCcy=t.fCcy; fCcz=t.fCcz; fCce=t.fCce; fCct=t.fCct; fCcc=t.fCcc; | |
196 | ||
197 | Int_t n=t.GetNumberOfClusters(); | |
198 | SetNumberOfClusters(n); | |
199 | for (Int_t i=0; i<n; i++) { | |
200 | fIndex[i]=t.fIndex[i]; | |
201 | fIndexBackup[i]=t.fIndex[i]; // MI - backup indexes | |
202 | fdQdl[i]=t.fdQdl[i]; | |
203 | } | |
204 | ||
205 | // initialisation (i starts from n) [SR, GSI, 18.02.2003] | |
206 | for(UInt_t i=n; i<kMAXCLUSTERSPERTRACK; i++) { | |
207 | fdQdl[i] = 0; | |
208 | fIndex[i] = 0; | |
209 | fIndexBackup[i] = 0; //MI backup indexes | |
210 | } | |
211 | for (Int_t i=0;i<6;i++){ | |
212 | fTracklets[i] = t.fTracklets[i]; | |
213 | } | |
214 | for (Int_t i=0;i<3;i++) { fBudget[i]=t.fBudget[i];}; | |
215 | } | |
216 | ||
217 | //_____________________________________________________________________________ | |
218 | AliTRDtrack::AliTRDtrack(const AliKalmanTrack& t, Double_t alpha) | |
219 | :AliKalmanTrack(t) | |
220 | { | |
221 | // | |
222 | // Constructor from AliTPCtrack or AliITStrack . | |
223 | // | |
224 | ||
225 | SetLabel(t.GetLabel()); | |
226 | SetChi2(0.); | |
227 | SetMass(t.GetMass()); | |
228 | SetNumberOfClusters(0); | |
229 | ||
230 | fdEdx=t.GetPIDsignal(); | |
231 | fDE = 0; | |
232 | for (Int_t i=0;i<kNplane;i++){ | |
233 | fdEdxPlane[i] = 0.0; | |
234 | fTimBinPlane[i] = -1; | |
235 | } | |
236 | ||
237 | fLhElectron = 0.0; | |
238 | fNWrong = 0; | |
239 | fNRotate = 0; | |
240 | fStopped = 0; | |
241 | fNExpected=0; | |
242 | fNExpectedLast=0; | |
243 | fNdedx =0; | |
244 | fNCross =0; | |
245 | fNLast =0; | |
246 | fChi2Last =0; | |
247 | fBackupTrack =0; | |
248 | ||
249 | fAlpha = alpha; | |
250 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
251 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
252 | ||
253 | Double_t x, p[5]; t.GetExternalParameters(x,p); | |
254 | ||
255 | fX=x; | |
256 | ||
257 | fY=p[0]; | |
258 | fZ=p[1]; | |
259 | fT=p[3]; x=GetLocalConvConst(); | |
260 | fC=p[4]/x; | |
261 | fE=fC*fX - p[2]; | |
262 | ||
263 | //Conversion of the covariance matrix | |
264 | Double_t c[15]; t.GetExternalCovariance(c); | |
265 | ||
266 | c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x; | |
267 | ||
268 | Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5]; | |
269 | Double_t c32=fX*c[13] - c[8]; | |
270 | Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12]; | |
271 | ||
272 | fCyy=c[0 ]; | |
273 | fCzy=c[1 ]; fCzz=c[2 ]; | |
274 | fCey=c20; fCez=c21; fCee=c22; | |
275 | fCty=c[6 ]; fCtz=c[7 ]; fCte=c32; fCtt=c[9 ]; | |
276 | fCcy=c[10]; fCcz=c[11]; fCce=c42; fCct=c[13]; fCcc=c[14]; | |
277 | ||
278 | // Initialization [SR, GSI, 18.02.2003] | |
279 | for(UInt_t i=0; i<kMAXCLUSTERSPERTRACK; i++) { | |
280 | fdQdl[i] = 0; | |
281 | fIndex[i] = 0; | |
282 | fIndexBackup[i] = 0; // MI backup indexes | |
283 | } | |
284 | ||
285 | for (Int_t i=0;i<3;i++) { fBudget[i]=0;}; | |
286 | } | |
287 | ||
288 | //_____________________________________________________________________________ | |
289 | AliTRDtrack::AliTRDtrack(const AliESDtrack& t) | |
290 | :AliKalmanTrack() | |
291 | { | |
292 | // | |
293 | // Constructor from AliESDtrack | |
294 | // | |
295 | ||
296 | SetLabel(t.GetLabel()); | |
297 | SetChi2(0.); | |
298 | SetMass(t.GetMass()); | |
299 | SetNumberOfClusters(t.GetTRDclusters(fIndex)); | |
300 | Int_t ncl = t.GetTRDclusters(fIndexBackup); | |
301 | for (UInt_t i=ncl;i<kMAXCLUSTERSPERTRACK;i++) { | |
302 | fIndexBackup[i]=0; | |
303 | fIndex[i] = 0; //MI store indexes | |
304 | } | |
305 | fdEdx=t.GetTRDsignal(); | |
306 | fDE =0; | |
307 | for (Int_t i=0;i<kNplane;i++){ | |
308 | fdEdxPlane[i] = t.GetTRDsignals(i); | |
309 | fTimBinPlane[i] = t.GetTRDTimBin(i); | |
310 | } | |
311 | ||
312 | fLhElectron = 0.0; | |
313 | fNWrong = 0; | |
314 | fStopped = 0; | |
315 | fNRotate = 0; | |
316 | fNExpected =0; | |
317 | fNExpectedLast=0; | |
318 | fNdedx = 0; | |
319 | fNCross =0; | |
320 | fNLast =0; | |
321 | fChi2Last =0; | |
322 | fBackupTrack =0; | |
323 | ||
324 | fAlpha = t.GetAlpha(); | |
325 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
326 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
327 | ||
328 | Double_t x, p[5]; t.GetExternalParameters(x,p); | |
329 | //Conversion of the covariance matrix | |
330 | Double_t c[15]; t.GetExternalCovariance(c); | |
331 | if (t.GetStatus()&AliESDtrack::kTRDbackup){ | |
332 | t.GetOuterExternalParameters(fAlpha,x,p); | |
333 | t.GetOuterExternalCovariance(c); | |
334 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
335 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
336 | } | |
337 | ||
338 | fX=x; | |
339 | ||
340 | fY=p[0]; | |
341 | fZ=p[1]; SaveLocalConvConst(); | |
342 | fT=p[3]; x=GetLocalConvConst(); | |
343 | fC=p[4]/x; | |
344 | fE=fC*fX - p[2]; | |
345 | ||
346 | ||
347 | c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x; | |
348 | ||
349 | Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5]; | |
350 | Double_t c32=fX*c[13] - c[8]; | |
351 | Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12]; | |
352 | ||
353 | fCyy=c[0 ]; | |
354 | fCzy=c[1 ]; fCzz=c[2 ]; | |
355 | fCey=c20; fCez=c21; fCee=c22; | |
356 | fCty=c[6 ]; fCtz=c[7 ]; fCte=c32; fCtt=c[9 ]; | |
357 | fCcy=c[10]; fCcz=c[11]; fCce=c42; fCct=c[13]; fCcc=c[14]; | |
358 | ||
359 | // Initialization [SR, GSI, 18.02.2003] | |
360 | for(UInt_t i=0; i<kMAXCLUSTERSPERTRACK; i++) { | |
361 | fdQdl[i] = 0; | |
362 | // fIndex[i] = 0; //MI store indexes | |
363 | } | |
364 | ||
365 | for (Int_t i=0;i<3;i++) { fBudget[i]=0;}; | |
366 | if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return; | |
367 | StartTimeIntegral(); | |
368 | Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times); | |
369 | SetIntegratedLength(t.GetIntegratedLength()); | |
370 | ||
371 | } | |
372 | ||
373 | //____________________________________________________________________________ | |
374 | AliTRDtrack::~AliTRDtrack() | |
375 | { | |
376 | // | |
377 | // Destructor | |
378 | // | |
379 | ||
380 | if (fBackupTrack) delete fBackupTrack; | |
381 | fBackupTrack = 0; | |
382 | ||
383 | } | |
384 | ||
385 | //____________________________________________________________________________ | |
386 | AliTRDtrack &AliTRDtrack::operator=(const AliTRDtrack &t) | |
387 | { | |
388 | // | |
389 | // Assignment operator | |
390 | // | |
391 | ||
392 | fLhElectron = 0.0; | |
393 | fNWrong = 0; | |
394 | fStopped = 0; | |
395 | fNRotate = 0; | |
396 | fNExpected =0; | |
397 | fNExpectedLast=0; | |
398 | fNdedx = 0; | |
399 | fNCross =0; | |
400 | fNLast =0; | |
401 | fChi2Last =0; | |
402 | fBackupTrack =0; | |
403 | ||
404 | fAlpha = t.GetAlpha(); | |
405 | if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
406 | else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
407 | ||
408 | return *this; | |
409 | ||
410 | } | |
411 | ||
412 | // //____________________________________________________________________________ | |
413 | // AliTRDtrack * AliTRDtrack::MakeTrack(const AliTrackReference *ref, Double_t mass) | |
414 | // { | |
415 | // // | |
416 | // // Make dummy track from the track reference | |
417 | // // negative mass means opposite charge | |
418 | // // | |
419 | // Double_t xx[5]; | |
420 | // Double_t cc[15]; | |
421 | // for (Int_t i=0;i<15;i++) cc[i]=0; | |
422 | // Double_t x = ref->X(), y = ref->Y(), z = ref->Z(); | |
423 | // Double_t alpha = TMath::ATan2(y,x); | |
424 | // Double_t xr = TMath::Sqrt(x*x+y*y); | |
425 | // xx[0] = 0; | |
426 | // xx[1] = z; | |
427 | // xx[3] = ref->Pz()/ref->Pt(); | |
428 | // Float_t b[3]; | |
429 | // Float_t xyz[3]={x,y,z}; | |
430 | // Float_t convConst = 0; | |
431 | // (AliKalmanTrack::GetFieldMap())->Field(xyz,b); | |
432 | // convConst=1000/0.299792458/(1e-13 - b[2]); | |
433 | // xx[4] = 1./(convConst*ref->Pt()); | |
434 | // if (mass<0) xx[4]*=-1.; // negative mass - negative direction | |
435 | // Double_t lcos = (x*ref->Px()+y*ref->Py())/(xr*ref->Pt()); | |
436 | // Double_t lsin = TMath::Sin(TMath::ACos(lcos)); | |
437 | // if (mass<0) lsin*=-1.; | |
438 | // xx[2] = xr*xx[4]-lsin; | |
439 | // AliTRDcluster cl; | |
440 | // AliTRDtrack * track = new AliTRDtrack(&cl,100,xx,cc,xr,alpha); | |
441 | // track->SetMass(TMath::Abs(mass)); | |
442 | // track->StartTimeIntegral(); | |
443 | // return track; | |
444 | // } | |
445 | ||
446 | //____________________________________________________________________________ | |
447 | Float_t AliTRDtrack::StatusForTOF() | |
448 | { | |
449 | // | |
450 | // Defines the status of the TOF extrapolation | |
451 | // | |
452 | ||
453 | Float_t res = (0.2 + 0.8*(fN/(fNExpected+5.)))*(0.4+0.6*fTracklets[5].GetN()/20.); | |
454 | res *= (0.25+0.8*40./(40.+fBudget[2])); | |
455 | return res; | |
456 | ||
457 | Int_t status=0; | |
458 | if (GetNumberOfClusters()<20) return 0; // | |
459 | if (fN>110&&fChi2/(Float_t(fN))<3) return 3; //gold | |
460 | if (fNLast>30&&fChi2Last/(Float_t(fNLast))<3) return 3; //gold | |
461 | if (fNLast>20&&fChi2Last/(Float_t(fNLast))<2) return 3; //gold | |
462 | if (fNLast/(fNExpectedLast+3.)>0.8 && fChi2Last/Float_t(fNLast)<5&&fNLast>20) return 2; //silber | |
463 | if (fNLast>5 &&((fNLast+1.)/(fNExpectedLast+1.))>0.8&&fChi2Last/(fNLast-5.)<6) return 1; | |
464 | ||
465 | return status; | |
466 | ||
467 | } | |
468 | ||
469 | //____________________________________________________________________________ | |
470 | void AliTRDtrack::GetExternalParameters(Double_t& xr, Double_t x[5]) const | |
471 | { | |
472 | // | |
473 | // This function returns external TRD track representation | |
474 | // | |
475 | ||
476 | xr = fX; | |
477 | x[0] = GetY(); | |
478 | x[1] = GetZ(); | |
479 | x[2] = GetSnp(); | |
480 | x[3] = GetTgl(); | |
481 | x[4] = Get1Pt(); | |
482 | ||
483 | } | |
484 | ||
485 | //_____________________________________________________________________________ | |
486 | void AliTRDtrack::GetExternalCovariance(Double_t cc[15]) const | |
487 | { | |
488 | // | |
489 | // This function returns external representation of the covriance matrix. | |
490 | // | |
491 | ||
492 | Double_t a=GetLocalConvConst(); | |
493 | ||
494 | Double_t c22=fX*fX*fCcc-2*fX*fCce+fCee; | |
495 | Double_t c32=fX*fCct-fCte; | |
496 | Double_t c20=fX*fCcy-fCey, c21=fX*fCcz-fCez, c42=fX*fCcc-fCce; | |
497 | ||
498 | cc[0 ]=fCyy; | |
499 | cc[1 ]=fCzy; cc[2 ]=fCzz; | |
500 | cc[3 ]=c20; cc[4 ]=c21; cc[5 ]=c22; | |
501 | cc[6 ]=fCty; cc[7 ]=fCtz; cc[8 ]=c32; cc[9 ]=fCtt; | |
502 | cc[10]=fCcy*a; cc[11]=fCcz*a; cc[12]=c42*a; cc[13]=fCct*a; cc[14]=fCcc*a*a; | |
503 | ||
504 | } | |
505 | ||
506 | //_____________________________________________________________________________ | |
507 | void AliTRDtrack::GetCovariance(Double_t cc[15]) const | |
508 | { | |
509 | // | |
510 | // Returns the track covariance matrix | |
511 | // | |
512 | ||
513 | cc[0]=fCyy; | |
514 | cc[1]=fCzy; cc[2]=fCzz; | |
515 | cc[3]=fCey; cc[4]=fCez; cc[5]=fCee; | |
516 | cc[6]=fCcy; cc[7]=fCcz; cc[8]=fCce; cc[9]=fCcc; | |
517 | cc[10]=fCty; cc[11]=fCtz; cc[12]=fCte; cc[13]=fCct; cc[14]=fCtt; | |
518 | ||
519 | } | |
520 | ||
521 | //_____________________________________________________________________________ | |
522 | Int_t AliTRDtrack::Compare(const TObject *o) const | |
523 | { | |
524 | // | |
525 | // Compares tracks according to their Y2 or curvature | |
526 | // | |
527 | ||
528 | AliTRDtrack *t=(AliTRDtrack*)o; | |
529 | // Double_t co=t->GetSigmaY2(); | |
530 | // Double_t c =GetSigmaY2(); | |
531 | ||
532 | Double_t co=TMath::Abs(t->GetC()); | |
533 | Double_t c =TMath::Abs(GetC()); | |
534 | ||
535 | if (c>co) return 1; | |
536 | else if (c<co) return -1; | |
537 | return 0; | |
538 | ||
539 | } | |
540 | ||
541 | //_____________________________________________________________________________ | |
542 | void AliTRDtrack::CookdEdx(Double_t low, Double_t up) { | |
543 | //----------------------------------------------------------------- | |
544 | // Calculates dE/dX within the "low" and "up" cuts. | |
545 | //----------------------------------------------------------------- | |
546 | ||
547 | Int_t i; | |
548 | //Int_t nc=GetNumberOfClusters(); | |
549 | Int_t nc=fNdedx; | |
550 | if (nc<10) { | |
551 | SetdEdx(0); | |
552 | return; | |
553 | } | |
554 | ||
555 | Float_t sorted[kMAXCLUSTERSPERTRACK]; | |
556 | for (i=0; i < nc; i++) { | |
557 | sorted[i]=fdQdl[i]; | |
558 | } | |
559 | Int_t nl=Int_t(low*nc), nu=Int_t(up*nc); | |
560 | Float_t dedx=0; | |
561 | //for (i=nl; i<=nu; i++) dedx += sorted[i]; | |
562 | //dedx /= (nu-nl+1); | |
563 | for (i=0; i<nc; i++) dedx += sorted[i]; // ADDED by PS | |
564 | if((nu-nl)) dedx /= (nu-nl); // ADDED by PS | |
565 | ||
566 | //SetdEdx(dedx); | |
567 | // | |
568 | // now real truncated mean | |
569 | for (i=0; i < nc; i++) { | |
570 | sorted[i]=TMath::Abs(fdQdl[i]); | |
571 | } | |
572 | Int_t * index = new Int_t[nc]; | |
573 | TMath::Sort(nc, sorted, index,kFALSE); | |
574 | dedx=0; | |
575 | for (i=nl; i<=nu; i++) dedx += sorted[index[i]]; | |
576 | dedx /= (nu-nl+1); | |
577 | fdEdxT = dedx; | |
578 | delete [] index; | |
579 | SetdEdx(dedx); | |
580 | ||
581 | } | |
582 | ||
583 | //_____________________________________________________________________________ | |
584 | Int_t AliTRDtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho) | |
585 | { | |
586 | // Propagates a track of particle with mass=pm to a reference plane | |
587 | // defined by x=xk through media of density=rho and radiationLength=x0 | |
588 | ||
589 | if (xk == fX) return 1; | |
590 | ||
591 | if (TMath::Abs(fC*xk - fE) >= 0.90000) { | |
592 | // Int_t n=GetNumberOfClusters(); | |
593 | //if (n>4) cerr << n << " AliTRDtrack: Propagation failed, \tPt = " | |
594 | // << GetPt() << "\t" << GetLabel() << "\t" << GetMass() << endl; | |
595 | return 0; | |
596 | } | |
597 | Double_t lcc=GetLocalConvConst(); | |
598 | ||
599 | // track Length measurement [SR, GSI, 17.02.2003] | |
600 | Double_t oldX = fX, oldY = fY, oldZ = fZ; | |
601 | ||
602 | Double_t x1=fX, x2=x1+(xk-x1), dx=x2-x1, y1=fY, z1=fZ; | |
603 | Double_t c1=fC*x1 - fE; | |
604 | if((c1*c1) > 1) return 0; | |
605 | Double_t r1=sqrt(1.- c1*c1); | |
606 | Double_t c2=fC*x2 - fE; | |
607 | if((c2*c2) > 1) return 0; | |
608 | Double_t r2=sqrt(1.- c2*c2); | |
609 | ||
610 | fY += dx*(c1+c2)/(r1+r2); | |
611 | fZ += dx*(c1+c2)/(c1*r2 + c2*r1)*fT; | |
612 | ||
613 | //f = F - 1 | |
614 | Double_t rr=r1+r2, cc=c1+c2, xx=x1+x2; | |
615 | Double_t f02=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr); | |
616 | Double_t f04= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr); | |
617 | Double_t cr=c1*r2+c2*r1; | |
618 | Double_t f12=-dx*fT*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr); | |
619 | Double_t f13= dx*cc/cr; | |
620 | Double_t f14=dx*fT*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr); | |
621 | ||
622 | //b = C*ft | |
623 | Double_t b00=f02*fCey + f04*fCcy, b01=f12*fCey + f14*fCcy + f13*fCty; | |
624 | Double_t b10=f02*fCez + f04*fCcz, b11=f12*fCez + f14*fCcz + f13*fCtz; | |
625 | Double_t b20=f02*fCee + f04*fCce, b21=f12*fCee + f14*fCce + f13*fCte; | |
626 | Double_t b30=f02*fCte + f04*fCct, b31=f12*fCte + f14*fCct + f13*fCtt; | |
627 | Double_t b40=f02*fCce + f04*fCcc, b41=f12*fCce + f14*fCcc + f13*fCct; | |
628 | ||
629 | //a = f*b = f*C*ft | |
630 | Double_t a00=f02*b20+f04*b40,a01=f02*b21+f04*b41,a11=f12*b21+f14*b41+f13*b31; | |
631 | ||
632 | //F*C*Ft = C + (a + b + bt) | |
633 | fCyy += a00 + 2*b00; | |
634 | fCzy += a01 + b01 + b10; | |
635 | fCey += b20; | |
636 | fCty += b30; | |
637 | fCcy += b40; | |
638 | fCzz += a11 + 2*b11; | |
639 | fCez += b21; | |
640 | fCtz += b31; | |
641 | fCcz += b41; | |
642 | ||
643 | fX=x2; | |
644 | ||
645 | //Change of the magnetic field ************* | |
646 | SaveLocalConvConst(); | |
647 | cc=fC; | |
648 | fC*=lcc/GetLocalConvConst(); | |
649 | fE+=fX*(fC-cc); | |
650 | ||
651 | //Multiple scattering ****************** | |
652 | Double_t d=sqrt((x1-fX)*(x1-fX)+(y1-fY)*(y1-fY)+(z1-fZ)*(z1-fZ)); | |
653 | Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt()); | |
654 | Double_t beta2=p2/(p2 + GetMass()*GetMass()); | |
655 | Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho; | |
656 | ||
657 | Double_t ey=fC*fX - fE, ez=fT; | |
658 | Double_t xz=fC*ez, zz1=ez*ez+1, xy=fE+ey; | |
659 | ||
660 | fCee += (2*ey*ez*ez*fE+1-ey*ey+ez*ez+fE*fE*ez*ez)*theta2; | |
661 | fCte += ez*zz1*xy*theta2; | |
662 | fCtt += zz1*zz1*theta2; | |
663 | fCce += xz*ez*xy*theta2; | |
664 | fCct += xz*zz1*theta2; | |
665 | fCcc += xz*xz*theta2; | |
666 | /* | |
667 | Double_t dc22 = (1-ey*ey+xz*xz*fX*fX)*theta2; | |
668 | Double_t dc32 = (xz*fX*zz1)*theta2; | |
669 | Double_t dc33 = (zz1*zz1)*theta2; | |
670 | Double_t dc42 = (xz*fX*xz)*theta2; | |
671 | Double_t dc43 = (zz1*xz)*theta2; | |
672 | Double_t dc44 = (xz*xz)*theta2; | |
673 | fCee += dc22; | |
674 | fCte += dc32; | |
675 | fCtt += dc33; | |
676 | fCce += dc42; | |
677 | fCct += dc43; | |
678 | fCcc += dc44; | |
679 | */ | |
680 | //Energy losses************************ | |
681 | if((5940*beta2/(1-beta2+1e-10) - beta2) < 0) return 0; | |
682 | ||
683 | Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2+1e-10)) - beta2)*d*rho; | |
684 | Float_t budget = d* rho; | |
685 | fBudget[0] +=budget; | |
686 | // | |
687 | // suspicious part - think about it ? | |
688 | Double_t kinE = TMath::Sqrt(p2); | |
689 | if (dE>0.8*kinE) dE = 0.8*kinE; // | |
690 | if (dE<0) dE = 0.0; // not valid region for Bethe bloch | |
691 | // | |
692 | // | |
693 | fDE+=dE; | |
694 | if (x1 < x2) dE=-dE; | |
695 | cc=fC; | |
696 | fC*=(1.- sqrt(p2+GetMass()*GetMass())/p2*dE); | |
697 | fE+=fX*(fC-cc); | |
698 | // Double_t sigmade = 0.1*dE*TMath::Sqrt(TMath::Sqrt(1+fT*fT)*90./(d+0.0001)); // 20 percent fluctuation - normalized to some length | |
699 | Double_t sigmade = 0.07*TMath::Sqrt(TMath::Abs(dE)); // energy loss fluctuation | |
700 | Double_t sigmac2 = sigmade*sigmade*fC*fC*(p2+GetMass()*GetMass())/(p2*p2); | |
701 | fCcc += sigmac2; | |
702 | fCee += fX*fX*sigmac2; | |
703 | ||
704 | // track time measurement [SR, GSI 17.02.2002] | |
705 | if (x1 < x2) | |
706 | if (IsStartedTimeIntegral()) { | |
707 | Double_t l2 = TMath::Sqrt((fX-oldX)*(fX-oldX) + (fY-oldY)*(fY-oldY) + (fZ-oldZ)*(fZ-oldZ)); | |
708 | if (TMath::Abs(l2*fC)>0.0001){ | |
709 | // make correction for curvature if neccesary | |
710 | l2 = 0.5*TMath::Sqrt((fX-oldX)*(fX-oldX) + (fY-oldY)*(fY-oldY)); | |
711 | l2 = 2*TMath::ASin(l2*fC)/fC; | |
712 | l2 = TMath::Sqrt(l2*l2+(fZ-oldZ)*(fZ-oldZ)); | |
713 | } | |
714 | AddTimeStep(l2); | |
715 | } | |
716 | ||
717 | return 1; | |
718 | } | |
719 | ||
720 | //_____________________________________________________________________________ | |
721 | Int_t AliTRDtrack::Update(const AliTRDcluster *c, Double_t chisq, UInt_t index | |
722 | , Double_t h01) | |
723 | { | |
724 | // Assignes found cluster to the track and updates track information | |
725 | ||
726 | Bool_t fNoTilt = kTRUE; | |
727 | if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE; | |
728 | // add angular effect to the error contribution - MI | |
729 | Float_t tangent2 = (fC*fX-fE)*(fC*fX-fE); | |
730 | if (tangent2 < 0.90000){ | |
731 | tangent2 = tangent2/(1.-tangent2); | |
732 | } | |
733 | Float_t errang = tangent2*0.04; // | |
734 | Float_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12.); | |
735 | ||
736 | Double_t r00=c->GetSigmaY2() +errang, r01=0., r11=c->GetSigmaZ2()*100.; | |
737 | r00+=fCyy; r01+=fCzy; r11+=fCzz; | |
738 | Double_t det=r00*r11 - r01*r01; | |
739 | Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
740 | ||
741 | Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11; | |
742 | Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11; | |
743 | Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11; | |
744 | Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11; | |
745 | Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11; | |
746 | ||
747 | Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ; | |
748 | Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz; | |
749 | ||
750 | ||
751 | if(fNoTilt) { | |
752 | if (TMath::Abs(cur*fX-eta) >= 0.90000) { | |
753 | // Int_t n=GetNumberOfClusters(); | |
754 | //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
755 | return 0; | |
756 | } | |
757 | fY += k00*dy + k01*dz; | |
758 | fZ += k10*dy + k11*dz; | |
759 | fE = eta; | |
760 | //fT += k30*dy + k31*dz; | |
761 | fC = cur; | |
762 | } | |
763 | else { | |
764 | Double_t xuFactor = 100.; // empirical factor set by C.Xu | |
765 | // in the first tilt version | |
766 | dy=c->GetY() - fY; dz=c->GetZ() - fZ; | |
767 | dy=dy+h01*dz; | |
768 | Float_t add=0; | |
769 | if (TMath::Abs(dz)>padlength/2.){ | |
770 | Float_t dy2 = c->GetY() - fY; | |
771 | Float_t sign = (dz>0) ? -1.: 1.; | |
772 | dy2+=h01*sign*padlength/2.; | |
773 | dy = dy2; | |
774 | add = 0; | |
775 | } | |
776 | ||
777 | ||
778 | ||
779 | r00=c->GetSigmaY2()+errang+add, r01=0., r11=c->GetSigmaZ2()*xuFactor; | |
780 | r00+=(fCyy+2.0*h01*fCzy+h01*h01*fCzz); | |
781 | r01+=(fCzy+h01*fCzz); | |
782 | r11+=fCzz; | |
783 | ||
784 | det=r00*r11 - r01*r01; | |
785 | tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
786 | ||
787 | k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01); | |
788 | k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01); | |
789 | k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01); | |
790 | k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01); | |
791 | k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01); | |
792 | ||
793 | ||
794 | cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz; | |
795 | if (TMath::Abs(cur*fX-eta) >= 0.90000) { | |
796 | // Int_t n=GetNumberOfClusters(); | |
797 | //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
798 | return 0; | |
799 | } | |
800 | fY += k00*dy + k01*dz; | |
801 | fZ += k10*dy + k11*dz; | |
802 | fE = eta; | |
803 | fT += k30*dy + k31*dz; | |
804 | fC = cur; | |
805 | ||
806 | k01+=h01*k00; | |
807 | k11+=h01*k10; | |
808 | k21+=h01*k20; | |
809 | k31+=h01*k30; | |
810 | k41+=h01*k40; | |
811 | ||
812 | } | |
813 | Double_t c01=fCzy, c02=fCey, c03=fCty, c04=fCcy; | |
814 | Double_t c12=fCez, c13=fCtz, c14=fCcz; | |
815 | ||
816 | ||
817 | fCyy-=k00*fCyy+k01*fCzy; fCzy-=k00*c01+k01*fCzz; | |
818 | fCey-=k00*c02+k01*c12; fCty-=k00*c03+k01*c13; | |
819 | fCcy-=k00*c04+k01*c14; | |
820 | ||
821 | fCzz-=k10*c01+k11*fCzz; | |
822 | fCez-=k10*c02+k11*c12; fCtz-=k10*c03+k11*c13; | |
823 | fCcz-=k10*c04+k11*c14; | |
824 | ||
825 | fCee-=k20*c02+k21*c12; fCte-=k20*c03+k21*c13; | |
826 | fCce-=k20*c04+k21*c14; | |
827 | ||
828 | fCtt-=k30*c03+k31*c13; | |
829 | fCct-=k40*c03+k41*c13; | |
830 | //fCct-=k30*c04+k31*c14; // symmetric formula MI | |
831 | ||
832 | fCcc-=k40*c04+k41*c14; | |
833 | ||
834 | Int_t n=GetNumberOfClusters(); | |
835 | fIndex[n]=index; | |
836 | SetNumberOfClusters(n+1); | |
837 | ||
838 | SetChi2(GetChi2()+chisq); | |
839 | // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl; | |
840 | ||
841 | return 1; | |
842 | ||
843 | } | |
844 | ||
845 | //_____________________________________________________________________________ | |
846 | Int_t AliTRDtrack::UpdateMI(const AliTRDcluster *c, Double_t chisq, UInt_t index, Double_t h01, | |
847 | Int_t /*plane*/) | |
848 | { | |
849 | // Assignes found cluster to the track and updates track information | |
850 | ||
851 | Bool_t fNoTilt = kTRUE; | |
852 | if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE; | |
853 | // add angular effect to the error contribution and make correction - MI | |
854 | //AliTRDclusterCorrection *corrector = AliTRDclusterCorrection::GetCorrection(); | |
855 | // | |
856 | Double_t tangent2 = (fC*fX-fE)*(fC*fX-fE); | |
857 | if (tangent2 < 0.90000){ | |
858 | tangent2 = tangent2/(1.-tangent2); | |
859 | } | |
860 | Double_t tangent = TMath::Sqrt(tangent2); | |
861 | if ((fC*fX-fE)<0) tangent*=-1; | |
862 | // Double_t correction = 0*plane; | |
863 | Double_t errang = tangent2*0.04; // | |
864 | Double_t errsys =0.025*0.025*20; //systematic error part | |
865 | Float_t extend =1; | |
866 | if (c->GetNPads()==4) extend=2; | |
867 | //if (c->GetNPads()==5) extend=3; | |
868 | //if (c->GetNPads()==6) extend=3; | |
869 | //if (c->GetQ()<15) return 1; | |
870 | ||
871 | /* | |
872 | if (corrector!=0){ | |
873 | //if (0){ | |
874 | correction = corrector->GetCorrection(plane,c->GetLocalTimeBin(),tangent); | |
875 | if (TMath::Abs(correction)>0){ | |
876 | //if we have info | |
877 | errang = corrector->GetSigma(plane,c->GetLocalTimeBin(),tangent); | |
878 | errang *= errang; | |
879 | errang += tangent2*0.04; | |
880 | } | |
881 | } | |
882 | */ | |
883 | // | |
884 | // Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12.); | |
885 | ||
886 | Double_t r00=(c->GetSigmaY2() +errang+errsys)*extend, r01=0., r11=c->GetSigmaZ2()*10000.; | |
887 | r00+=fCyy; r01+=fCzy; r11+=fCzz; | |
888 | Double_t det=r00*r11 - r01*r01; | |
889 | Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
890 | ||
891 | Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11; | |
892 | Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11; | |
893 | Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11; | |
894 | Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11; | |
895 | Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11; | |
896 | ||
897 | Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ; | |
898 | Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz; | |
899 | ||
900 | ||
901 | if(fNoTilt) { | |
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"; | |
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 | else { | |
914 | Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12); | |
915 | ||
916 | Double_t xuFactor = 1000.; // empirical factor set by C.Xu | |
917 | // in the first tilt version | |
918 | dy=c->GetY() - fY; dz=c->GetZ() - fZ; | |
919 | //dy=dy+h01*dz+correction; | |
920 | ||
921 | Double_t tiltdz = dz; | |
922 | if (TMath::Abs(tiltdz)>padlength/2.) { | |
923 | tiltdz = TMath::Sign(padlength/2,dz); | |
924 | } | |
925 | // dy=dy+h01*dz; | |
926 | dy=dy+h01*tiltdz; | |
927 | ||
928 | Double_t add=0; | |
929 | if (TMath::Abs(dz)>padlength/2.){ | |
930 | //Double_t dy2 = c->GetY() - fY; | |
931 | //Double_t sign = (dz>0) ? -1.: 1.; | |
932 | //dy2-=h01*sign*padlength/2.; | |
933 | //dy = dy2; | |
934 | add =1; | |
935 | } | |
936 | Double_t s00 = (c->GetSigmaY2()+errang)*extend+errsys+add; // error pad | |
937 | Double_t s11 = c->GetSigmaZ2()*xuFactor; // error pad-row | |
938 | // | |
939 | r00 = fCyy + 2*fCzy*h01 + fCzz*h01*h01+s00; | |
940 | r01 = fCzy + fCzz*h01; | |
941 | r11 = fCzz + s11; | |
942 | det = r00*r11 - r01*r01; | |
943 | // inverse matrix | |
944 | tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
945 | ||
946 | // K matrix | |
947 | k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01); | |
948 | k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01); | |
949 | k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01); | |
950 | k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01); | |
951 | k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01); | |
952 | // | |
953 | //Update measurement | |
954 | cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz; | |
955 | if (TMath::Abs(cur*fX-eta) >= 0.90000) { | |
956 | //Int_t n=GetNumberOfClusters(); | |
957 | // if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
958 | return 0; | |
959 | } | |
960 | fY += k00*dy + k01*dz; | |
961 | fZ += k10*dy + k11*dz; | |
962 | fE = eta; | |
963 | fT += k30*dy + k31*dz; | |
964 | fC = cur; | |
965 | ||
966 | k01+=h01*k00; | |
967 | k11+=h01*k10; | |
968 | k21+=h01*k20; | |
969 | k31+=h01*k30; | |
970 | k41+=h01*k40; | |
971 | ||
972 | } | |
973 | //Update covariance | |
974 | // | |
975 | // | |
976 | Double_t oldyy = fCyy, oldzz = fCzz; //, oldee=fCee, oldcc =fCcc; | |
977 | Double_t oldzy = fCzy, oldey = fCey, oldty=fCty, oldcy =fCcy; | |
978 | Double_t oldez = fCez, oldtz = fCtz, oldcz=fCcz; | |
979 | //Double_t oldte = fCte, oldce = fCce; | |
980 | //Double_t oldct = fCct; | |
981 | ||
982 | fCyy-=k00*oldyy+k01*oldzy; | |
983 | fCzy-=k10*oldyy+k11*oldzy; | |
984 | fCey-=k20*oldyy+k21*oldzy; | |
985 | fCty-=k30*oldyy+k31*oldzy; | |
986 | fCcy-=k40*oldyy+k41*oldzy; | |
987 | // | |
988 | fCzz-=k10*oldzy+k11*oldzz; | |
989 | fCez-=k20*oldzy+k21*oldzz; | |
990 | fCtz-=k30*oldzy+k31*oldzz; | |
991 | fCcz-=k40*oldzy+k41*oldzz; | |
992 | // | |
993 | fCee-=k20*oldey+k21*oldez; | |
994 | fCte-=k30*oldey+k31*oldez; | |
995 | fCce-=k40*oldey+k41*oldez; | |
996 | // | |
997 | fCtt-=k30*oldty+k31*oldtz; | |
998 | fCct-=k40*oldty+k41*oldtz; | |
999 | // | |
1000 | fCcc-=k40*oldcy+k41*oldcz; | |
1001 | // | |
1002 | ||
1003 | Int_t n=GetNumberOfClusters(); | |
1004 | fIndex[n]=index; | |
1005 | SetNumberOfClusters(n+1); | |
1006 | ||
1007 | SetChi2(GetChi2()+chisq); | |
1008 | // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl; | |
1009 | ||
1010 | return 1; | |
1011 | ||
1012 | } | |
1013 | ||
1014 | //_____________________________________________________________________________ | |
1015 | Int_t AliTRDtrack::UpdateMI(const AliTRDtracklet &tracklet) | |
1016 | { | |
1017 | // | |
1018 | // Assignes found tracklet to the track and updates track information | |
1019 | // | |
1020 | // | |
1021 | Double_t r00=(tracklet.GetTrackletSigma2()), r01=0., r11= 10000.; | |
1022 | r00+=fCyy; r01+=fCzy; r11+=fCzz; | |
1023 | // | |
1024 | Double_t det=r00*r11 - r01*r01; | |
1025 | Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
1026 | // | |
1027 | ||
1028 | Double_t dy=tracklet.GetY() - fY, dz=tracklet.GetZ() - fZ; | |
1029 | ||
1030 | ||
1031 | Double_t s00 = tracklet.GetTrackletSigma2(); // error pad | |
1032 | Double_t s11 = 100000; // error pad-row | |
1033 | Float_t h01 = tracklet.GetTilt(); | |
1034 | // | |
1035 | // r00 = fCyy + 2*fCzy*h01 + fCzz*h01*h01+s00; | |
1036 | r00 = fCyy + fCzz*h01*h01+s00; | |
1037 | // r01 = fCzy + fCzz*h01; | |
1038 | r01 = fCzy ; | |
1039 | r11 = fCzz + s11; | |
1040 | det = r00*r11 - r01*r01; | |
1041 | // inverse matrix | |
1042 | tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det; | |
1043 | ||
1044 | Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11; | |
1045 | Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11; | |
1046 | Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11; | |
1047 | Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11; | |
1048 | Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11; | |
1049 | ||
1050 | // K matrix | |
1051 | // k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01); | |
1052 | // k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01); | |
1053 | // k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01); | |
1054 | // k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01); | |
1055 | // k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01); | |
1056 | // | |
1057 | //Update measurement | |
1058 | Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz; | |
1059 | // cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz; | |
1060 | if (TMath::Abs(cur*fX-eta) >= 0.90000) { | |
1061 | //Int_t n=GetNumberOfClusters(); | |
1062 | // if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n"; | |
1063 | return 0; | |
1064 | } | |
1065 | // k01+=h01*k00; | |
1066 | // k11+=h01*k10; | |
1067 | // k21+=h01*k20; | |
1068 | // k31+=h01*k30; | |
1069 | // k41+=h01*k40; | |
1070 | ||
1071 | ||
1072 | fY += k00*dy + k01*dz; | |
1073 | fZ += k10*dy + k11*dz; | |
1074 | fE = eta; | |
1075 | fT += k30*dy + k31*dz; | |
1076 | fC = cur; | |
1077 | ||
1078 | ||
1079 | //Update covariance | |
1080 | // | |
1081 | // | |
1082 | Double_t oldyy = fCyy, oldzz = fCzz; //, oldee=fCee, oldcc =fCcc; | |
1083 | Double_t oldzy = fCzy, oldey = fCey, oldty=fCty, oldcy =fCcy; | |
1084 | Double_t oldez = fCez, oldtz = fCtz, oldcz=fCcz; | |
1085 | //Double_t oldte = fCte, oldce = fCce; | |
1086 | //Double_t oldct = fCct; | |
1087 | ||
1088 | fCyy-=k00*oldyy+k01*oldzy; | |
1089 | fCzy-=k10*oldyy+k11*oldzy; | |
1090 | fCey-=k20*oldyy+k21*oldzy; | |
1091 | fCty-=k30*oldyy+k31*oldzy; | |
1092 | fCcy-=k40*oldyy+k41*oldzy; | |
1093 | // | |
1094 | fCzz-=k10*oldzy+k11*oldzz; | |
1095 | fCez-=k20*oldzy+k21*oldzz; | |
1096 | fCtz-=k30*oldzy+k31*oldzz; | |
1097 | fCcz-=k40*oldzy+k41*oldzz; | |
1098 | // | |
1099 | fCee-=k20*oldey+k21*oldez; | |
1100 | fCte-=k30*oldey+k31*oldez; | |
1101 | fCce-=k40*oldey+k41*oldez; | |
1102 | // | |
1103 | fCtt-=k30*oldty+k31*oldtz; | |
1104 | fCct-=k40*oldty+k41*oldtz; | |
1105 | // | |
1106 | fCcc-=k40*oldcy+k41*oldcz; | |
1107 | // | |
1108 | /* | |
1109 | Int_t n=GetNumberOfClusters(); | |
1110 | fIndex[n]=index; | |
1111 | SetNumberOfClusters(n+1); | |
1112 | ||
1113 | SetChi2(GetChi2()+chisq); | |
1114 | // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl; | |
1115 | */ | |
1116 | ||
1117 | return 1; | |
1118 | ||
1119 | } | |
1120 | ||
1121 | //_____________________________________________________________________________ | |
1122 | Int_t AliTRDtrack::Rotate(Double_t alpha, Bool_t absolute) | |
1123 | { | |
1124 | // Rotates track parameters in R*phi plane | |
1125 | // if absolute rotation alpha is in global system | |
1126 | // otherwise alpha rotation is relative to the current rotation angle | |
1127 | ||
1128 | if (absolute) { | |
1129 | alpha -= fAlpha; | |
1130 | } | |
1131 | else{ | |
1132 | fNRotate++; | |
1133 | } | |
1134 | ||
1135 | fAlpha += alpha; | |
1136 | if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi(); | |
1137 | if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi(); | |
1138 | ||
1139 | Double_t x1=fX, y1=fY; | |
1140 | Double_t ca=cos(alpha), sa=sin(alpha); | |
1141 | Double_t r1=fC*fX - fE; | |
1142 | ||
1143 | fX = x1*ca + y1*sa; | |
1144 | fY =-x1*sa + y1*ca; | |
1145 | if((r1*r1) > 1) return 0; | |
1146 | fE=fE*ca + (fC*y1 + sqrt(1.- r1*r1))*sa; | |
1147 | ||
1148 | Double_t r2=fC*fX - fE; | |
1149 | if (TMath::Abs(r2) >= 0.90000) { | |
1150 | Int_t n=GetNumberOfClusters(); | |
1151 | if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !\n"; | |
1152 | return 0; | |
1153 | } | |
1154 | ||
1155 | if((r2*r2) > 1) return 0; | |
1156 | Double_t y0=fY + sqrt(1.- r2*r2)/fC; | |
1157 | if ((fY-y0)*fC >= 0.) { | |
1158 | Int_t n=GetNumberOfClusters(); | |
1159 | if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !!!\n"; | |
1160 | return 0; | |
1161 | } | |
1162 | ||
1163 | //f = F - 1 | |
1164 | Double_t f00=ca-1, f24=(y1 - r1*x1/sqrt(1.- r1*r1))*sa, | |
1165 | f20=fC*sa, f22=(ca + sa*r1/sqrt(1.- r1*r1))-1; | |
1166 | ||
1167 | //b = C*ft | |
1168 | Double_t b00=fCyy*f00, b02=fCyy*f20+fCcy*f24+fCey*f22; | |
1169 | Double_t b10=fCzy*f00, b12=fCzy*f20+fCcz*f24+fCez*f22; | |
1170 | Double_t b20=fCey*f00, b22=fCey*f20+fCce*f24+fCee*f22; | |
1171 | Double_t b30=fCty*f00, b32=fCty*f20+fCct*f24+fCte*f22; | |
1172 | Double_t b40=fCcy*f00, b42=fCcy*f20+fCcc*f24+fCce*f22; | |
1173 | ||
1174 | //a = f*b = f*C*ft | |
1175 | Double_t a00=f00*b00, a02=f00*b02, a22=f20*b02+f24*b42+f22*b22; | |
1176 | ||
1177 | //F*C*Ft = C + (a + b + bt) | |
1178 | fCyy += a00 + 2*b00; | |
1179 | fCzy += b10; | |
1180 | fCey += a02+b20+b02; | |
1181 | fCty += b30; | |
1182 | fCcy += b40; | |
1183 | fCez += b12; | |
1184 | fCte += b32; | |
1185 | fCee += a22 + 2*b22; | |
1186 | fCce += b42; | |
1187 | ||
1188 | return 1; | |
1189 | ||
1190 | } | |
1191 | ||
1192 | //_____________________________________________________________________________ | |
1193 | Double_t AliTRDtrack::GetPredictedChi2(const AliTRDcluster *c, Double_t h01) const | |
1194 | { | |
1195 | // | |
1196 | // Returns the track chi2 | |
1197 | // | |
1198 | ||
1199 | Bool_t fNoTilt = kTRUE; | |
1200 | if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE; | |
1201 | Double_t chi2, dy, r00, r01, r11; | |
1202 | ||
1203 | if(fNoTilt) { | |
1204 | dy=c->GetY() - fY; | |
1205 | r00=c->GetSigmaY2(); | |
1206 | chi2 = (dy*dy)/r00; | |
1207 | } | |
1208 | else { | |
1209 | Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12); | |
1210 | // | |
1211 | r00=c->GetSigmaY2(); r01=0.; r11=c->GetSigmaZ2(); | |
1212 | r00+=fCyy; r01+=fCzy; r11+=fCzz; | |
1213 | ||
1214 | Double_t det=r00*r11 - r01*r01; | |
1215 | if (TMath::Abs(det) < 1.e-10) { | |
1216 | Int_t n=GetNumberOfClusters(); | |
1217 | if (n>4) cerr<<n<<" AliTRDtrack warning: Singular matrix !\n"; | |
1218 | return 1e10; | |
1219 | } | |
1220 | Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01; | |
1221 | Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ; | |
1222 | Double_t tiltdz = dz; | |
1223 | if (TMath::Abs(tiltdz)>padlength/2.) { | |
1224 | tiltdz = TMath::Sign(padlength/2,dz); | |
1225 | } | |
1226 | // dy=dy+h01*dz; | |
1227 | dy=dy+h01*tiltdz; | |
1228 | ||
1229 | chi2 = (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det; | |
1230 | } | |
1231 | ||
1232 | return chi2; | |
1233 | ||
1234 | } | |
1235 | ||
1236 | //_________________________________________________________________________ | |
1237 | void AliTRDtrack::GetPxPyPz(Double_t& px, Double_t& py, Double_t& pz) const | |
1238 | { | |
1239 | // Returns reconstructed track momentum in the global system. | |
1240 | ||
1241 | Double_t pt=TMath::Abs(GetPt()); // GeV/c | |
1242 | Double_t r=fC*fX-fE; | |
1243 | ||
1244 | Double_t y0; | |
1245 | if(r > 1) { py = pt; px = 0; } | |
1246 | else if(r < -1) { py = -pt; px = 0; } | |
1247 | else { | |
1248 | y0=fY + sqrt(1.- r*r)/fC; | |
1249 | px=-pt*(fY-y0)*fC; //cos(phi); | |
1250 | py=-pt*(fE-fX*fC); //sin(phi); | |
1251 | } | |
1252 | pz=pt*fT; | |
1253 | Double_t tmp=px*TMath::Cos(fAlpha) - py*TMath::Sin(fAlpha); | |
1254 | py=px*TMath::Sin(fAlpha) + py*TMath::Cos(fAlpha); | |
1255 | px=tmp; | |
1256 | ||
1257 | } | |
1258 | ||
1259 | //_________________________________________________________________________ | |
1260 | void AliTRDtrack::GetGlobalXYZ(Double_t& x, Double_t& y, Double_t& z) const | |
1261 | { | |
1262 | // Returns reconstructed track coordinates in the global system. | |
1263 | ||
1264 | x = fX; y = fY; z = fZ; | |
1265 | Double_t tmp=x*TMath::Cos(fAlpha) - y*TMath::Sin(fAlpha); | |
1266 | y=x*TMath::Sin(fAlpha) + y*TMath::Cos(fAlpha); | |
1267 | x=tmp; | |
1268 | ||
1269 | } | |
1270 | ||
1271 | //_________________________________________________________________________ | |
1272 | void AliTRDtrack::ResetCovariance() | |
1273 | { | |
1274 | // | |
1275 | // Resets covariance matrix | |
1276 | // | |
1277 | ||
1278 | fCyy*=10.; | |
1279 | fCzy=0.; fCzz*=10.; | |
1280 | fCey=0.; fCez=0.; fCee*=10.; | |
1281 | fCty=0.; fCtz=0.; fCte=0.; fCtt*=10.; | |
1282 | fCcy=0.; fCcz=0.; fCce=0.; fCct=0.; fCcc*=10.; | |
1283 | ||
1284 | } | |
1285 | ||
1286 | //_____________________________________________________________________________ | |
1287 | void AliTRDtrack::ResetCovariance(Float_t mult) | |
1288 | { | |
1289 | // | |
1290 | // Resets covariance matrix | |
1291 | // | |
1292 | ||
1293 | fCyy*=mult; | |
1294 | fCzy*=0.; fCzz*=1.; | |
1295 | fCey*=0.; fCez*=0.; fCee*=mult; | |
1296 | fCty*=0.; fCtz*=0.; fCte*=0.; fCtt*=1.; | |
1297 | fCcy*=0.; fCcz*=0.; fCce*=0.; fCct*=0.; fCcc*=mult; | |
1298 | ||
1299 | } | |
1300 | ||
1301 | //_____________________________________________________________________________ | |
1302 | void AliTRDtrack::MakeBackupTrack() | |
1303 | { | |
1304 | // | |
1305 | // Creates a backup track | |
1306 | // | |
1307 | ||
1308 | if (fBackupTrack) delete fBackupTrack; | |
1309 | fBackupTrack = new AliTRDtrack(*this); | |
1310 | ||
1311 | } | |
1312 | ||
1313 | //_____________________________________________________________________________ | |
1314 | Int_t AliTRDtrack::GetProlongation(Double_t xk, Double_t &y, Double_t &z) | |
1315 | { | |
1316 | // | |
1317 | // Find prolongation at given x | |
1318 | // return 0 if not exist | |
1319 | ||
1320 | Double_t c1=fC*fX - fE; | |
1321 | if (TMath::Abs(c1)>1.) return 0; | |
1322 | Double_t r1=TMath::Sqrt(1.- c1*c1); | |
1323 | Double_t c2=fC*xk - fE; | |
1324 | if (TMath::Abs(c2)>1.) return 0; | |
1325 | Double_t r2=TMath::Sqrt(1.- c2*c2); | |
1326 | y =fY + (xk-fX)*(c1+c2)/(r1+r2); | |
1327 | z =fZ + (xk-fX)*(c1+c2)/(c1*r2 + c2*r1)*fT; | |
1328 | ||
1329 | return 1; | |
1330 | ||
1331 | } | |
1332 | ||
1333 | //_____________________________________________________________________________ | |
1334 | Int_t AliTRDtrack::PropagateToX(Double_t xr, Double_t step) | |
1335 | { | |
1336 | // | |
1337 | // Propagate track to given x position | |
1338 | // works inside of the 20 degree segmentation (local cooordinate frame for TRD , TPC, TOF) | |
1339 | // | |
1340 | // material budget from geo manager | |
1341 | // | |
1342 | Double_t xyz0[3], xyz1[3],y,z; | |
1343 | const Double_t kAlphac = TMath::Pi()/9.; | |
1344 | const Double_t kTalphac = TMath::Tan(kAlphac*0.5); | |
1345 | // critical alpha - cross sector indication | |
1346 | // | |
1347 | Double_t dir = (fX>xr) ? -1.:1.; | |
1348 | // direction +- | |
1349 | for (Double_t x=fX+dir*step;dir*x<dir*xr;x+=dir*step){ | |
1350 | // | |
1351 | GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]); | |
1352 | GetProlongation(x,y,z); | |
1353 | xyz1[0] = x*TMath::Cos(fAlpha)+y*TMath::Sin(fAlpha); | |
1354 | xyz1[1] = x*TMath::Sin(fAlpha)-y*TMath::Cos(fAlpha); | |
1355 | xyz1[2] = z; | |
1356 | Double_t param[7]; | |
1357 | AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param); | |
1358 | // | |
1359 | if (param[0]>0&¶m[1]>0) PropagateTo(x,param[1],param[0]); | |
1360 | if (fY>fX*kTalphac){ | |
1361 | Rotate(-kAlphac); | |
1362 | } | |
1363 | if (fY<-fX*kTalphac){ | |
1364 | Rotate(kAlphac); | |
1365 | } | |
1366 | } | |
1367 | // | |
1368 | PropagateTo(xr); | |
1369 | ||
1370 | return 0; | |
1371 | ||
1372 | } | |
1373 | ||
1374 | //_____________________________________________________________________________ | |
1375 | Int_t AliTRDtrack::PropagateToR(Double_t r,Double_t step) | |
1376 | { | |
1377 | // | |
1378 | // propagate track to the radial position | |
1379 | // rotation always connected to the last track position | |
1380 | // | |
1381 | Double_t xyz0[3], xyz1[3],y,z; | |
1382 | Double_t radius = TMath::Sqrt(fX*fX+fY*fY); | |
1383 | Double_t dir = (radius>r) ? -1.:1.; // direction +- | |
1384 | // | |
1385 | for (Double_t x=radius+dir*step;dir*x<dir*r;x+=dir*step){ | |
1386 | GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]); | |
1387 | Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]); | |
1388 | Rotate(alpha,kTRUE); | |
1389 | GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]); | |
1390 | GetProlongation(x,y,z); | |
1391 | xyz1[0] = x*TMath::Cos(alpha)+y*TMath::Sin(alpha); | |
1392 | xyz1[1] = x*TMath::Sin(alpha)-y*TMath::Cos(alpha); | |
1393 | xyz1[2] = z; | |
1394 | Double_t param[7]; | |
1395 | AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param); | |
1396 | if (param[1]<=0) param[1] =100000000; | |
1397 | PropagateTo(x,param[1],param[0]); | |
1398 | } | |
1399 | GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]); | |
1400 | Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]); | |
1401 | Rotate(alpha,kTRUE); | |
1402 | GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]); | |
1403 | GetProlongation(r,y,z); | |
1404 | xyz1[0] = r*TMath::Cos(alpha)+y*TMath::Sin(alpha); | |
1405 | xyz1[1] = r*TMath::Sin(alpha)-y*TMath::Cos(alpha); | |
1406 | xyz1[2] = z; | |
1407 | Double_t param[7]; | |
1408 | AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param); | |
1409 | // | |
1410 | if (param[1]<=0) param[1] =100000000; | |
1411 | PropagateTo(r,param[1],param[0]); | |
1412 | ||
1413 | return 0; | |
1414 | ||
1415 | } | |
1416 | ||
1417 | //_____________________________________________________________________________ | |
1418 | Int_t AliTRDtrack::GetSector() const | |
1419 | { | |
1420 | // | |
1421 | // Return the current sector | |
1422 | // | |
1423 | ||
1424 | return Int_t(TVector2::Phi_0_2pi(fAlpha) | |
1425 | / AliTRDgeometry::GetAlpha()) | |
1426 | % AliTRDgeometry::kNsect; | |
1427 | ||
1428 | } | |
1429 | ||
1430 | //_____________________________________________________________________________ | |
1431 | Double_t AliTRDtrack::Get1Pt() const | |
1432 | { | |
1433 | // | |
1434 | // Returns 1 / pt | |
1435 | // | |
1436 | ||
1437 | return (TMath::Sign(1e-9,fC) + fC)*GetLocalConvConst(); | |
1438 | ||
1439 | } | |
1440 | ||
1441 | //_____________________________________________________________________________ | |
1442 | Double_t AliTRDtrack::GetP() const | |
1443 | { | |
1444 | // | |
1445 | // Returns the total momentum | |
1446 | // | |
1447 | ||
1448 | return TMath::Abs(GetPt())*sqrt(1.+GetTgl()*GetTgl()); | |
1449 | ||
1450 | } | |
1451 | ||
1452 | //_____________________________________________________________________________ | |
1453 | Double_t AliTRDtrack::GetYat(Double_t xk) const | |
1454 | { | |
1455 | // | |
1456 | // This function calculates the Y-coordinate of a track at | |
1457 | // the plane x = xk. | |
1458 | // Needed for matching with the TOF (I.Belikov) | |
1459 | // | |
1460 | ||
1461 | Double_t c1 = fC*fX - fE; | |
1462 | Double_t r1 = TMath::Sqrt(1.0 - c1*c1); | |
1463 | Double_t c2 = fC*xk - fE; | |
1464 | Double_t r2 = TMath::Sqrt(1.0- c2*c2); | |
1465 | return fY + (xk-fX)*(c1+c2)/(r1+r2); | |
1466 | ||
1467 | } | |
1468 | ||
1469 | //_____________________________________________________________________________ | |
1470 | void AliTRDtrack::SetSampledEdx(Float_t q, Int_t i) | |
1471 | { | |
1472 | // | |
1473 | // The sampled energy loss | |
1474 | // | |
1475 | ||
1476 | Double_t s = GetSnp(); | |
1477 | Double_t t = GetTgl(); | |
1478 | q *= TMath::Sqrt((1-s*s)/(1+t*t)); | |
1479 | fdQdl[i] = q; | |
1480 | ||
1481 | } | |
1482 | ||
1483 | //_____________________________________________________________________________ | |
1484 | void AliTRDtrack::SetSampledEdx(Float_t q) | |
1485 | { | |
1486 | // | |
1487 | // The sampled energy loss | |
1488 | // | |
1489 | ||
1490 | Double_t s = GetSnp(); | |
1491 | Double_t t = GetTgl(); | |
1492 | q*= TMath::Sqrt((1-s*s)/(1+t*t)); | |
1493 | fdQdl[fNdedx] = q; | |
1494 | fNdedx++; | |
1495 | ||
1496 | } | |
1497 | ||
1498 | //_____________________________________________________________________________ | |
1499 | void AliTRDtrack::GetXYZ(Float_t r[3]) const | |
1500 | { | |
1501 | ||
1502 | //--------------------------------------------------------------------- | |
1503 | // Returns the position of the track in the global coord. system | |
1504 | //--------------------------------------------------------------------- | |
1505 | ||
1506 | Double_t cs = TMath::Cos(fAlpha); | |
1507 | Double_t sn = TMath::Sin(fAlpha); | |
1508 | r[0] = fX*cs - fY*sn; | |
1509 | r[1] = fX*sn + fY*cs; | |
1510 | r[2] = fZ; | |
1511 | ||
1512 | } |