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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 | //------------------------------------------------------------------------- | |
19 | // Implementation of the AliTracker class | |
20 | // that is the base for AliTPCtracker, AliITStrackerV2 and AliTRDtracker | |
21 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch | |
22 | //------------------------------------------------------------------------- | |
23 | #include <TClass.h> | |
24 | #include <TMath.h> | |
25 | #include <TH1F.h> | |
26 | #include <TGeoManager.h> | |
27 | #include <TGeoMatrix.h> | |
28 | ||
29 | #include "AliLog.h" | |
30 | #include "AliMagF.h" | |
31 | #include "AliTracker.h" | |
32 | #include "AliGeomManager.h" | |
33 | #include "AliCluster.h" | |
34 | #include "AliKalmanTrack.h" | |
35 | #include "AliGlobalQADataMaker.h" | |
36 | ||
37 | extern TGeoManager *gGeoManager; | |
38 | ||
39 | Bool_t AliTracker::fFillResiduals=kFALSE; | |
40 | TObjArray **AliTracker::fResiduals=NULL; | |
41 | AliRecoParam::EventSpecie_t AliTracker::fEventSpecie=AliRecoParam::kDefault; | |
42 | ||
43 | ClassImp(AliTracker) | |
44 | ||
45 | AliTracker::AliTracker(): | |
46 | TObject(), | |
47 | fX(0), | |
48 | fY(0), | |
49 | fZ(0), | |
50 | fSigmaX(0.005), | |
51 | fSigmaY(0.005), | |
52 | fSigmaZ(0.010), | |
53 | fEventInfo(NULL) | |
54 | { | |
55 | //-------------------------------------------------------------------- | |
56 | // The default constructor. | |
57 | //-------------------------------------------------------------------- | |
58 | if (!TGeoGlobalMagField::Instance()->GetField()) | |
59 | AliWarning("Field map is not set."); | |
60 | } | |
61 | ||
62 | //__________________________________________________________________________ | |
63 | AliTracker::AliTracker(const AliTracker &atr): | |
64 | TObject(atr), | |
65 | fX(atr.fX), | |
66 | fY(atr.fY), | |
67 | fZ(atr.fZ), | |
68 | fSigmaX(atr.fSigmaX), | |
69 | fSigmaY(atr.fSigmaY), | |
70 | fSigmaZ(atr.fSigmaZ), | |
71 | fEventInfo(atr.fEventInfo) | |
72 | { | |
73 | //-------------------------------------------------------------------- | |
74 | // The default constructor. | |
75 | //-------------------------------------------------------------------- | |
76 | if (!TGeoGlobalMagField::Instance()->GetField()) | |
77 | AliWarning("Field map is not set."); | |
78 | } | |
79 | ||
80 | //__________________________________________________________________________ | |
81 | Double_t AliTracker::GetBz() | |
82 | { | |
83 | AliMagF* fld = (AliMagF*)TGeoGlobalMagField::Instance()->GetField(); | |
84 | if (!fld) return 0.5*kAlmost0Field; | |
85 | Double_t bz = fld->SolenoidField(); | |
86 | return TMath::Sign(0.5*kAlmost0Field,bz) + bz; | |
87 | } | |
88 | ||
89 | //__________________________________________________________________________ | |
90 | Double_t AliTracker::GetBz(const Double_t *r) { | |
91 | //------------------------------------------------------------------ | |
92 | // Returns Bz (kG) at the point "r" . | |
93 | //------------------------------------------------------------------ | |
94 | AliMagF* fld = (AliMagF*)TGeoGlobalMagField::Instance()->GetField(); | |
95 | if (!fld) return 0.5*kAlmost0Field; | |
96 | Double_t bz = fld->GetBz(r); | |
97 | return TMath::Sign(0.5*kAlmost0Field,bz) + bz; | |
98 | } | |
99 | ||
100 | //__________________________________________________________________________ | |
101 | void AliTracker::GetBxByBz(const Double_t r[3], Double_t b[3]) { | |
102 | //------------------------------------------------------------------ | |
103 | // Returns Bx, By and Bz (kG) at the point "r" . | |
104 | //------------------------------------------------------------------ | |
105 | AliMagF* fld = (AliMagF*)TGeoGlobalMagField::Instance()->GetField(); | |
106 | if (!fld) { | |
107 | b[0] = b[1] = 0.; | |
108 | b[2] = 0.5*kAlmost0Field; | |
109 | return; | |
110 | } | |
111 | ||
112 | if (fld->IsUniform()) { | |
113 | b[0] = b[1] = 0.; | |
114 | b[2] = fld->SolenoidField(); | |
115 | } else { | |
116 | fld->Field(r,b); | |
117 | } | |
118 | b[2] = (TMath::Sign(0.5*kAlmost0Field,b[2]) + b[2]); | |
119 | return; | |
120 | } | |
121 | ||
122 | //__________________________________________________________________________ | |
123 | void AliTracker::FillClusterArray(TObjArray* /*array*/) const | |
124 | { | |
125 | // Publishes all pointers to clusters known to the tracker into the | |
126 | // passed object array. | |
127 | // The ownership is not transfered - the caller is not expected to delete | |
128 | // the clusters. | |
129 | ||
130 | AliWarning("should be overriden by a sub-class."); | |
131 | } | |
132 | ||
133 | //__________________________________________________________________________ | |
134 | void AliTracker::CookLabel(AliKalmanTrack *t, Float_t wrong) const { | |
135 | //-------------------------------------------------------------------- | |
136 | //This function "cooks" a track label. If label<0, this track is fake. | |
137 | //-------------------------------------------------------------------- | |
138 | Int_t noc=t->GetNumberOfClusters(); | |
139 | if (noc<1) return; | |
140 | Int_t *lb=new Int_t[noc]; | |
141 | Int_t *mx=new Int_t[noc]; | |
142 | AliCluster **clusters=new AliCluster*[noc]; | |
143 | ||
144 | Int_t i; | |
145 | for (i=0; i<noc; i++) { | |
146 | lb[i]=mx[i]=0; | |
147 | Int_t index=t->GetClusterIndex(i); | |
148 | clusters[i]=GetCluster(index); | |
149 | } | |
150 | ||
151 | Int_t lab=123456789; | |
152 | for (i=0; i<noc; i++) { | |
153 | AliCluster *c=clusters[i]; | |
154 | lab=TMath::Abs(c->GetLabel(0)); | |
155 | Int_t j; | |
156 | for (j=0; j<noc; j++) if (lb[j]==lab || mx[j]==0) break; | |
157 | lb[j]=lab; | |
158 | (mx[j])++; | |
159 | } | |
160 | ||
161 | Int_t max=0; | |
162 | for (i=0; i<noc; i++) if (mx[i]>max) {max=mx[i]; lab=lb[i];} | |
163 | ||
164 | for (i=0; i<noc; i++) { | |
165 | AliCluster *c=clusters[i]; | |
166 | //if (TMath::Abs(c->GetLabel(1)) == lab || | |
167 | // TMath::Abs(c->GetLabel(2)) == lab ) max++; | |
168 | if (TMath::Abs(c->GetLabel(0)!=lab)) | |
169 | if (TMath::Abs(c->GetLabel(1)) == lab || | |
170 | TMath::Abs(c->GetLabel(2)) == lab ) max++; | |
171 | } | |
172 | ||
173 | if ((1.- Float_t(max)/noc) > wrong) lab=-lab; | |
174 | t->SetFakeRatio((1.- Float_t(max)/noc)); | |
175 | t->SetLabel(lab); | |
176 | ||
177 | delete[] lb; | |
178 | delete[] mx; | |
179 | delete[] clusters; | |
180 | } | |
181 | ||
182 | //____________________________________________________________________________ | |
183 | void AliTracker::UseClusters(const AliKalmanTrack *t, Int_t from) const { | |
184 | //------------------------------------------------------------------ | |
185 | //This function marks clusters associated with the track. | |
186 | //------------------------------------------------------------------ | |
187 | Int_t noc=t->GetNumberOfClusters(); | |
188 | for (Int_t i=from; i<noc; i++) { | |
189 | Int_t index=t->GetClusterIndex(i); | |
190 | AliCluster *c=GetCluster(index); | |
191 | c->Use(); | |
192 | } | |
193 | } | |
194 | ||
195 | Double_t AliTracker::MeanMaterialBudget(const Double_t *start, const Double_t *end, Double_t *mparam) | |
196 | { | |
197 | // | |
198 | // Calculate mean material budget and material properties between | |
199 | // the points "start" and "end". | |
200 | // | |
201 | // "mparam" - parameters used for the energy and multiple scattering | |
202 | // corrections: | |
203 | // | |
204 | // mparam[0] - mean density: sum(x_i*rho_i)/sum(x_i) [g/cm3] | |
205 | // mparam[1] - equivalent rad length fraction: sum(x_i/X0_i) [adimensional] | |
206 | // mparam[2] - mean A: sum(x_i*A_i)/sum(x_i) [adimensional] | |
207 | // mparam[3] - mean Z: sum(x_i*Z_i)/sum(x_i) [adimensional] | |
208 | // mparam[4] - length: sum(x_i) [cm] | |
209 | // mparam[5] - Z/A mean: sum(x_i*Z_i/A_i)/sum(x_i) [adimensional] | |
210 | // mparam[6] - number of boundary crosses | |
211 | // | |
212 | // Origin: Marian Ivanov, Marian.Ivanov@cern.ch | |
213 | // | |
214 | // Corrections and improvements by | |
215 | // Andrea Dainese, Andrea.Dainese@lnl.infn.it, | |
216 | // Andrei Gheata, Andrei.Gheata@cern.ch | |
217 | // | |
218 | ||
219 | mparam[0]=0; mparam[1]=1; mparam[2] =0; mparam[3] =0; | |
220 | mparam[4]=0; mparam[5]=0; mparam[6]=0; | |
221 | // | |
222 | Double_t bparam[6]; // total parameters | |
223 | Double_t lparam[6]; // local parameters | |
224 | ||
225 | for (Int_t i=0;i<6;i++) bparam[i]=0; | |
226 | ||
227 | if (!gGeoManager) { | |
228 | AliErrorClass("No TGeo\n"); | |
229 | return 0.; | |
230 | } | |
231 | // | |
232 | Double_t length; | |
233 | Double_t dir[3]; | |
234 | length = TMath::Sqrt((end[0]-start[0])*(end[0]-start[0])+ | |
235 | (end[1]-start[1])*(end[1]-start[1])+ | |
236 | (end[2]-start[2])*(end[2]-start[2])); | |
237 | mparam[4]=length; | |
238 | if (length<TGeoShape::Tolerance()) return 0.0; | |
239 | Double_t invlen = 1./length; | |
240 | dir[0] = (end[0]-start[0])*invlen; | |
241 | dir[1] = (end[1]-start[1])*invlen; | |
242 | dir[2] = (end[2]-start[2])*invlen; | |
243 | ||
244 | // Initialize start point and direction | |
245 | TGeoNode *currentnode = 0; | |
246 | TGeoNode *startnode = gGeoManager->InitTrack(start, dir); | |
247 | if (!startnode) { | |
248 | AliErrorClass(Form("start point out of geometry: x %f, y %f, z %f", | |
249 | start[0],start[1],start[2])); | |
250 | return 0.0; | |
251 | } | |
252 | TGeoMaterial *material = startnode->GetVolume()->GetMedium()->GetMaterial(); | |
253 | lparam[0] = material->GetDensity(); | |
254 | lparam[1] = material->GetRadLen(); | |
255 | lparam[2] = material->GetA(); | |
256 | lparam[3] = material->GetZ(); | |
257 | lparam[4] = length; | |
258 | lparam[5] = lparam[3]/lparam[2]; | |
259 | if (material->IsMixture()) { | |
260 | TGeoMixture * mixture = (TGeoMixture*)material; | |
261 | lparam[5] =0; | |
262 | Double_t sum =0; | |
263 | for (Int_t iel=0;iel<mixture->GetNelements();iel++){ | |
264 | sum += mixture->GetWmixt()[iel]; | |
265 | lparam[5]+= mixture->GetZmixt()[iel]*mixture->GetWmixt()[iel]/mixture->GetAmixt()[iel]; | |
266 | } | |
267 | lparam[5]/=sum; | |
268 | } | |
269 | ||
270 | // Locate next boundary within length without computing safety. | |
271 | // Propagate either with length (if no boundary found) or just cross boundary | |
272 | gGeoManager->FindNextBoundaryAndStep(length, kFALSE); | |
273 | Double_t step = 0.0; // Step made | |
274 | Double_t snext = gGeoManager->GetStep(); | |
275 | // If no boundary within proposed length, return current density | |
276 | if (!gGeoManager->IsOnBoundary()) { | |
277 | mparam[0] = lparam[0]; | |
278 | mparam[1] = lparam[4]/lparam[1]; | |
279 | mparam[2] = lparam[2]; | |
280 | mparam[3] = lparam[3]; | |
281 | mparam[4] = lparam[4]; | |
282 | return lparam[0]; | |
283 | } | |
284 | // Try to cross the boundary and see what is next | |
285 | Int_t nzero = 0; | |
286 | while (length>TGeoShape::Tolerance()) { | |
287 | currentnode = gGeoManager->GetCurrentNode(); | |
288 | if (snext<2.*TGeoShape::Tolerance()) nzero++; | |
289 | else nzero = 0; | |
290 | if (nzero>3) { | |
291 | // This means navigation has problems on one boundary | |
292 | // Try to cross by making a small step | |
293 | AliErrorClass("Cannot cross boundary\n"); | |
294 | mparam[0] = bparam[0]/step; | |
295 | mparam[1] = bparam[1]; | |
296 | mparam[2] = bparam[2]/step; | |
297 | mparam[3] = bparam[3]/step; | |
298 | mparam[5] = bparam[5]/step; | |
299 | mparam[4] = step; | |
300 | mparam[0] = 0.; // if crash of navigation take mean density 0 | |
301 | mparam[1] = 1000000; // and infinite rad length | |
302 | return bparam[0]/step; | |
303 | } | |
304 | mparam[6]+=1.; | |
305 | step += snext; | |
306 | bparam[1] += snext/lparam[1]; | |
307 | bparam[2] += snext*lparam[2]; | |
308 | bparam[3] += snext*lparam[3]; | |
309 | bparam[5] += snext*lparam[5]; | |
310 | bparam[0] += snext*lparam[0]; | |
311 | ||
312 | if (snext>=length) break; | |
313 | if (!currentnode) break; | |
314 | length -= snext; | |
315 | material = currentnode->GetVolume()->GetMedium()->GetMaterial(); | |
316 | lparam[0] = material->GetDensity(); | |
317 | lparam[1] = material->GetRadLen(); | |
318 | lparam[2] = material->GetA(); | |
319 | lparam[3] = material->GetZ(); | |
320 | lparam[5] = lparam[3]/lparam[2]; | |
321 | if (material->IsMixture()) { | |
322 | TGeoMixture * mixture = (TGeoMixture*)material; | |
323 | lparam[5]=0; | |
324 | Double_t sum =0; | |
325 | for (Int_t iel=0;iel<mixture->GetNelements();iel++){ | |
326 | sum+= mixture->GetWmixt()[iel]; | |
327 | lparam[5]+= mixture->GetZmixt()[iel]*mixture->GetWmixt()[iel]/mixture->GetAmixt()[iel]; | |
328 | } | |
329 | lparam[5]/=sum; | |
330 | } | |
331 | gGeoManager->FindNextBoundaryAndStep(length, kFALSE); | |
332 | snext = gGeoManager->GetStep(); | |
333 | } | |
334 | mparam[0] = bparam[0]/step; | |
335 | mparam[1] = bparam[1]; | |
336 | mparam[2] = bparam[2]/step; | |
337 | mparam[3] = bparam[3]/step; | |
338 | mparam[5] = bparam[5]/step; | |
339 | return bparam[0]/step; | |
340 | } | |
341 | ||
342 | ||
343 | Bool_t | |
344 | AliTracker::PropagateTrackTo(AliExternalTrackParam *track, Double_t xToGo, | |
345 | Double_t mass, Double_t maxStep, Bool_t rotateTo, Double_t maxSnp, Double_t sign){ | |
346 | //---------------------------------------------------------------- | |
347 | // | |
348 | // Propagates the track to the plane X=xk (cm) using the magnetic field map | |
349 | // and correcting for the crossed material. | |
350 | // | |
351 | // mass - mass used in propagation - used for energy loss correction | |
352 | // maxStep - maximal step for propagation | |
353 | // | |
354 | // Origin: Marian Ivanov, Marian.Ivanov@cern.ch | |
355 | // | |
356 | //---------------------------------------------------------------- | |
357 | const Double_t kEpsilon = 0.00001; | |
358 | Double_t xpos = track->GetX(); | |
359 | Double_t dir = (xpos<xToGo) ? 1.:-1.; | |
360 | // | |
361 | while ( (xToGo-xpos)*dir > kEpsilon){ | |
362 | Double_t step = dir*TMath::Min(TMath::Abs(xToGo-xpos), maxStep); | |
363 | Double_t x = xpos+step; | |
364 | Double_t xyz0[3],xyz1[3],param[7]; | |
365 | track->GetXYZ(xyz0); //starting global position | |
366 | ||
367 | Double_t bz=GetBz(xyz0); // getting the local Bz | |
368 | ||
369 | if (!track->GetXYZAt(x,bz,xyz1)) return kFALSE; // no prolongation | |
370 | xyz1[2]+=kEpsilon; // waiting for bug correction in geo | |
371 | ||
372 | if (TMath::Abs(track->GetSnpAt(x,bz)) >= maxSnp) return kFALSE; | |
373 | if (!track->PropagateTo(x,bz)) return kFALSE; | |
374 | ||
375 | MeanMaterialBudget(xyz0,xyz1,param); | |
376 | Double_t xrho=param[0]*param[4]*sign, xx0=param[1]; | |
377 | ||
378 | if (!track->CorrectForMeanMaterial(xx0,xrho,mass)) return kFALSE; | |
379 | if (rotateTo){ | |
380 | if (TMath::Abs(track->GetSnp()) >= maxSnp) return kFALSE; | |
381 | track->GetXYZ(xyz0); // global position | |
382 | Double_t alphan = TMath::ATan2(xyz0[1], xyz0[0]); | |
383 | // | |
384 | Double_t ca=TMath::Cos(alphan-track->GetAlpha()), | |
385 | sa=TMath::Sin(alphan-track->GetAlpha()); | |
386 | Double_t sf=track->GetSnp(), cf=TMath::Sqrt((1.-sf)*(1.+sf)); | |
387 | Double_t sinNew = sf*ca - cf*sa; | |
388 | if (TMath::Abs(sinNew) >= maxSnp) return kFALSE; | |
389 | if (!track->Rotate(alphan)) return kFALSE; | |
390 | } | |
391 | xpos = track->GetX(); | |
392 | } | |
393 | return kTRUE; | |
394 | } | |
395 | ||
396 | Bool_t | |
397 | AliTracker::PropagateTrackToBxByBz(AliExternalTrackParam *track, | |
398 | Double_t xToGo, | |
399 | Double_t mass, Double_t maxStep, Bool_t rotateTo, Double_t maxSnp,Double_t sign){ | |
400 | //---------------------------------------------------------------- | |
401 | // | |
402 | // Propagates the track to the plane X=xk (cm) | |
403 | // taking into account all the three components of the magnetic field | |
404 | // and correcting for the crossed material. | |
405 | // | |
406 | // mass - mass used in propagation - used for energy loss correction | |
407 | // maxStep - maximal step for propagation | |
408 | // | |
409 | // Origin: Marian Ivanov, Marian.Ivanov@cern.ch | |
410 | // | |
411 | //---------------------------------------------------------------- | |
412 | const Double_t kEpsilon = 0.00001; | |
413 | Double_t xpos = track->GetX(); | |
414 | Double_t dir = (xpos<xToGo) ? 1.:-1.; | |
415 | // | |
416 | while ( (xToGo-xpos)*dir > kEpsilon){ | |
417 | Double_t step = dir*TMath::Min(TMath::Abs(xToGo-xpos), maxStep); | |
418 | Double_t x = xpos+step; | |
419 | Double_t xyz0[3],xyz1[3],param[7]; | |
420 | track->GetXYZ(xyz0); //starting global position | |
421 | ||
422 | Double_t b[3]; GetBxByBz(xyz0,b); // getting the local Bx, By and Bz | |
423 | ||
424 | if (!track->GetXYZAt(x,b[2],xyz1)) return kFALSE; // no prolongation | |
425 | xyz1[2]+=kEpsilon; // waiting for bug correction in geo | |
426 | ||
427 | if (TMath::Abs(track->GetSnpAt(x,b[2])) >= maxSnp) return kFALSE; | |
428 | if (!track->PropagateToBxByBz(x,b)) return kFALSE; | |
429 | ||
430 | MeanMaterialBudget(xyz0,xyz1,param); | |
431 | Double_t xrho=param[0]*param[4]*sign, xx0=param[1]; | |
432 | ||
433 | if (!track->CorrectForMeanMaterial(xx0,xrho,mass)) return kFALSE; | |
434 | if (rotateTo){ | |
435 | if (TMath::Abs(track->GetSnp()) >= maxSnp) return kFALSE; | |
436 | track->GetXYZ(xyz0); // global position | |
437 | Double_t alphan = TMath::ATan2(xyz0[1], xyz0[0]); | |
438 | // | |
439 | Double_t ca=TMath::Cos(alphan-track->GetAlpha()), | |
440 | sa=TMath::Sin(alphan-track->GetAlpha()); | |
441 | Double_t sf=track->GetSnp(), cf=TMath::Sqrt((1.-sf)*(1.+sf)); | |
442 | Double_t sinNew = sf*ca - cf*sa; | |
443 | if (TMath::Abs(sinNew) >= maxSnp) return kFALSE; | |
444 | if (!track->Rotate(alphan)) return kFALSE; | |
445 | } | |
446 | xpos = track->GetX(); | |
447 | } | |
448 | return kTRUE; | |
449 | } | |
450 | ||
451 | void AliTracker::FillResiduals(const AliExternalTrackParam *t, | |
452 | Double_t *p, Double_t *cov, | |
453 | UShort_t id, Bool_t updated) { | |
454 | // | |
455 | // This function fills the histograms of residuals | |
456 | // The array of these histos is external for this AliTracker class. | |
457 | // Normally, this array belong to AliGlobalQADataMaker class. | |
458 | // | |
459 | if (!fFillResiduals) return; | |
460 | if (!fResiduals) return; | |
461 | ||
462 | const Double_t *residuals=t->GetResiduals(p,cov,updated); | |
463 | if (!residuals) return; | |
464 | ||
465 | TH1F *h=0; | |
466 | Int_t esIndex = AliRecoParam::AConvert(fEventSpecie) ; | |
467 | AliGeomManager::ELayerID layer=AliGeomManager::VolUIDToLayer(id); | |
468 | h=(TH1F*)fResiduals[esIndex]->At(2*layer-2); | |
469 | if (h) h->Fill(residuals[0]); | |
470 | h=(TH1F*)fResiduals[esIndex]->At(2*layer-1); | |
471 | if (h) h->Fill(residuals[1]); | |
472 | ||
473 | if (layer==5) { | |
474 | if (p[1]<0) { // SSD1 absolute residuals | |
475 | h = (TH1F*)fResiduals[esIndex]->At(40); | |
476 | if (h) h->Fill(t->GetY()-p[0]); //C side | |
477 | h = (TH1F*)fResiduals[esIndex]->At(41); | |
478 | if (h) h->Fill(t->GetZ()-p[1]); | |
479 | } else { | |
480 | h = (TH1F*)fResiduals[esIndex]->At(42); | |
481 | if (h) h->Fill(t->GetY()-p[0]); //A side | |
482 | h = (TH1F*)fResiduals[esIndex]->At(43); | |
483 | if (h) h->Fill(t->GetZ()-p[1]); | |
484 | } | |
485 | } | |
486 | if (layer==6) { // SSD2 absolute residuals | |
487 | if (p[1]<0) { | |
488 | h = (TH1F*)fResiduals[esIndex]->At(44); | |
489 | if (h) h->Fill(t->GetY()-p[0]); //C side | |
490 | h = (TH1F*)fResiduals[esIndex]->At(45); | |
491 | if (h) h->Fill(t->GetZ()-p[1]); | |
492 | } else { | |
493 | h = (TH1F*)fResiduals[esIndex]->At(46); | |
494 | if (h) h->Fill(t->GetY()-p[0]); //A side | |
495 | h = (TH1F*)fResiduals[esIndex]->At(47); | |
496 | if (h) h->Fill(t->GetZ()-p[1]); | |
497 | } | |
498 | } | |
499 | ||
500 | } | |
501 | ||
502 | void AliTracker::FillResiduals(const AliExternalTrackParam *t, | |
503 | const AliCluster *c, Bool_t /*updated*/) { | |
504 | // | |
505 | // This function fills the histograms of residuals | |
506 | // The array of these histos is external for this AliTracker class. | |
507 | // Normally, this array belong to AliGlobalQADataMaker class. | |
508 | // | |
509 | // For the moment, the residuals are absolute ! | |
510 | // | |
511 | ||
512 | if (!fFillResiduals) return; | |
513 | if (!fResiduals) return; | |
514 | ||
515 | UShort_t id=c->GetVolumeId(); | |
516 | const TGeoHMatrix *matrixT2L=AliGeomManager::GetTracking2LocalMatrix(id); | |
517 | ||
518 | // Position of the cluster in the tracking c.s. | |
519 | Double_t clsTrk[3]={c->GetX(), c->GetY(), c->GetZ()}; | |
520 | // Position of the cluster in the local module c.s. | |
521 | Double_t clsLoc[3]={0.,0.,0.}; | |
522 | matrixT2L->LocalToMaster(clsTrk,clsLoc); | |
523 | ||
524 | ||
525 | // Position of the intersection point in the tracking c.s. | |
526 | Double_t trkTrk[3]={t->GetX(),t->GetY(),t->GetZ()}; | |
527 | // Position of the intersection point in the local module c.s. | |
528 | Double_t trkLoc[3]={0.,0.,0.}; | |
529 | matrixT2L->LocalToMaster(trkTrk,trkLoc); | |
530 | ||
531 | Double_t residuals[2]={trkLoc[0]-clsLoc[0], trkLoc[2]-clsLoc[2]}; | |
532 | ||
533 | TH1F *h=0; | |
534 | Int_t esIndex = AliRecoParam::AConvert(fEventSpecie) ; | |
535 | AliGeomManager::ELayerID layer=AliGeomManager::VolUIDToLayer(id); | |
536 | h=(TH1F*)fResiduals[esIndex]->At(2*layer-2); | |
537 | if (h) h->Fill(residuals[0]); | |
538 | h=(TH1F*)fResiduals[esIndex]->At(2*layer-1); | |
539 | if (h) h->Fill(residuals[1]); | |
540 | ||
541 | } | |
542 | ||
543 | Double_t AliTracker::GetTrackPredictedChi2(AliExternalTrackParam *track, | |
544 | Double_t mass, Double_t step, | |
545 | const AliExternalTrackParam *backup) { | |
546 | // | |
547 | // This function brings the "track" with particle "mass" [GeV] | |
548 | // to the same local coord. system and the same reference plane as | |
549 | // of the "backup", doing it in "steps" [cm]. | |
550 | // Then, it calculates the 5D predicted Chi2 for these two tracks | |
551 | // | |
552 | Double_t chi2=kVeryBig; | |
553 | Double_t alpha=backup->GetAlpha(); | |
554 | if (!track->Rotate(alpha)) return chi2; | |
555 | ||
556 | Double_t xb=backup->GetX(); | |
557 | Double_t sign=(xb < track->GetX()) ? 1. : -1.; | |
558 | if (!PropagateTrackTo(track,xb,mass,step,kFALSE,kAlmost1,sign)) return chi2; | |
559 | ||
560 | chi2=track->GetPredictedChi2(backup); | |
561 | ||
562 | return chi2; | |
563 | } |