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30bd9a5a | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-2012, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | /////////////////////////////////////////////////////////////////////////////// | |
17 | // | |
18 | // Track matching between TRD online tracks and ESD tracks. | |
19 | // | |
20 | // Author: Felix Rettig <rettig@compeng.uni-frankfurt.de> | |
21 | // | |
22 | /////////////////////////////////////////////////////////////////////////////// | |
23 | ||
24 | #include <TH1.h> | |
25 | #include <AliESDEvent.h> | |
26 | #include <AliExternalTrackParam.h> | |
27 | #include "AliESDtrack.h" | |
28 | #include "AliESDTrdTrack.h" | |
29 | #include <AliGeomManager.h> | |
30 | #include "AliTRDgeometry.h" | |
31 | #include "AliTRDpadPlane.h" | |
32 | #include "AliTRDonlineTrackMatching.h" | |
33 | ||
34 | const Float_t AliTRDonlineTrackMatching::fgkSaveInnerRadius = 290.5; | |
35 | const Float_t AliTRDonlineTrackMatching::fgkSaveOuterRadius = 364.5; | |
36 | ||
37 | Float_t AliTRDonlineTrackMatching::fEsdTrackCutMinTPCrows = 0.; | |
38 | Float_t AliTRDonlineTrackMatching::fEsdTrackCutMinRatioRowsFindableClusters = 0.; | |
39 | Float_t AliTRDonlineTrackMatching::fEsdTrackCutMaxChi2TPCclusters = 0.; | |
40 | Float_t AliTRDonlineTrackMatching::fEsdTrackCutMaxChi2ITSclusters = 0.; | |
41 | Float_t AliTRDonlineTrackMatching::fEsdTrackCutMaxDCAtoVertexXY = 0.; | |
42 | Float_t AliTRDonlineTrackMatching::fEsdTrackCutMaxDCAtoVertexZ = 0.; | |
43 | UShort_t AliTRDonlineTrackMatching::fEsdTrackCutsITSlayerMask = 0; // similar to 2011 default cut: 0x3 | |
44 | Float_t AliTRDonlineTrackMatching::fEsdTrackVCutsChi2TPCconstrainedVsGlobal = 0.; | |
45 | Float_t AliTRDonlineTrackMatching::fEsdTrackCutPtDCAOfs = 0.; | |
46 | Float_t AliTRDonlineTrackMatching::fEsdTrackCutPtDCACoeff = 0.; | |
47 | Bool_t AliTRDonlineTrackMatching::fEsdTrackCutMinimal = kFALSE; | |
48 | Bool_t AliTRDonlineTrackMatching::fEsdTrackCutRequireTPCrefit = kTRUE; | |
49 | Bool_t AliTRDonlineTrackMatching::fEsdTrackCutRequireITSrefit = kFALSE; | |
50 | Bool_t AliTRDonlineTrackMatching::fEsdTrackCutPrim = kFALSE; | |
51 | ||
52 | AliTRDonlineTrackMatching::AliTRDonlineTrackMatching() : | |
633f3ec4 | 53 | TObject(), |
30bd9a5a | 54 | fTRDgeo(NULL), |
55 | fMinMatchRating(0.25), | |
56 | fHistMatchRating(NULL) | |
57 | { | |
58 | // default ctor | |
59 | SetEsdTrackDefaultCuts("minimal"); | |
60 | } | |
61 | ||
62 | AliTRDonlineTrackMatching::AliTRDonlineTrackMatching(const AliTRDonlineTrackMatching &c) : | |
633f3ec4 | 63 | TObject(c), |
30bd9a5a | 64 | fTRDgeo(c.fTRDgeo), |
65 | fMinMatchRating(c.fMinMatchRating), | |
66 | fHistMatchRating(c.fHistMatchRating) | |
67 | { | |
68 | // copy ctor | |
69 | } | |
70 | ||
71 | AliTRDonlineTrackMatching::~AliTRDonlineTrackMatching() { | |
72 | ||
73 | // dtor | |
74 | ||
75 | delete fTRDgeo; | |
76 | fTRDgeo = NULL; | |
77 | } | |
78 | ||
79 | Short_t AliTRDonlineTrackMatching::EstimateSector(const Double_t globalCoords[3]) { | |
80 | ||
81 | // estimates sector by phi angle in x-y plane | |
82 | ||
83 | if ((TMath::Abs(globalCoords[0]) > 600) || (TMath::Abs(globalCoords[0]) > 600) || (TMath::Sqrt(globalCoords[0]*globalCoords[0] + globalCoords[1]*globalCoords[1]) < 0.01)){ | |
84 | //printf("GGG %.3f/%.3f\n", globalCoords[0], globalCoords[1]); | |
85 | return -1; | |
86 | } else { | |
87 | Double_t ang = TMath::ATan2(globalCoords[1], globalCoords[0]); | |
88 | if (ang > 0){ | |
89 | #ifdef TRD_TM_DEBUG | |
90 | printf(" es: %.2f/%.2f -> phi: %.2fdeg -> Sec %02d (A)\n", | |
91 | globalCoords[0], globalCoords[1], TMath::ATan2(globalCoords[1], globalCoords[0])*180./TMath::Pi(), | |
92 | TMath::FloorNint(ang/(20./180.*TMath::Pi()))); | |
93 | #endif | |
94 | return TMath::FloorNint(ang/(20./180.*TMath::Pi())); | |
95 | } else { | |
96 | #ifdef TRD_TM_DEBUG | |
97 | printf(" es: %.2f/%.2f -> phi: %.2fdeg -> Sec %02d (B)\n", | |
98 | globalCoords[0], globalCoords[1], TMath::ATan2(globalCoords[1], globalCoords[0])*180./TMath::Pi(), | |
99 | 17 - TMath::FloorNint(TMath::Abs(ang)/(20./180.*TMath::Pi()))); | |
100 | #endif | |
101 | return 17 - TMath::FloorNint(TMath::Abs(ang)/(20./180.*TMath::Pi())); | |
102 | } | |
103 | ||
104 | } | |
105 | } | |
106 | ||
6403ed35 | 107 | Short_t AliTRDonlineTrackMatching::EstimateLayer(Double_t radius) { |
30bd9a5a | 108 | |
109 | // estimates layer by radial distance (for virtual stack at phi = 0) | |
110 | ||
111 | const Float_t rBoundaries[7] = {290.80, 302.20, 315.06, 327.55, 340.3, 352.80, 364.15}; // radial border lines centered between anode plane and successing radiator | |
112 | const Short_t rLayers[7] = {-1, 0, 1, 2, 3, 4, 5}; | |
113 | for (UShort_t i = 0; i < 7; ++i){ | |
114 | if (radius < rBoundaries[i]) | |
115 | return rLayers[i]; | |
116 | } | |
117 | return -2; // radius larger than outmost layer | |
118 | } | |
119 | ||
120 | Short_t AliTRDonlineTrackMatching::EstimateLocalStack(const Double_t globalCoords[3]) { | |
121 | ||
122 | // determines stack within sector by z position | |
123 | ||
124 | Double_t absZ = TMath::Abs(globalCoords[2]); | |
125 | Short_t signZ = (globalCoords[2] > 0.) ? 1 : -1; | |
126 | Double_t r = TMath::Sqrt(globalCoords[0]*globalCoords[0] + globalCoords[1]*globalCoords[1]); | |
127 | Short_t layer = EstimateLayer(r); | |
128 | ||
129 | #ifdef TRD_TM_DEBUG | |
130 | printf("EstimateLocalStack A r: %.2f x: %.2f/%.2f/%.2f -> layer: %i absZ = %.2f\n", | |
131 | r, globalCoords[0], globalCoords[1], globalCoords[2], layer, absZ); | |
132 | #endif | |
133 | ||
134 | if (layer < 0) | |
135 | return -1; | |
136 | ||
137 | Double_t innerStackHalfLength = AliTRDgeometry::GetChamberLength(0, 2) / 2.; // same for all layers | |
138 | if (absZ < innerStackHalfLength) | |
139 | return 2; | |
140 | ||
141 | Double_t outerStackLength = AliTRDgeometry::GetChamberLength(layer, 1); | |
142 | ||
143 | absZ -= innerStackHalfLength; | |
144 | ||
145 | #ifdef TRD_TM_DEBUG | |
146 | printf("EstimateLocalStack B r: %.2f x: %.2f/%.2f/%.2f -> layer: %i absZ = %.2f il: %.2f ol: %.2f\n", | |
147 | r, globalCoords[0], globalCoords[1], globalCoords[2], layer, absZ, 2.*innerStackHalfLength, outerStackLength); | |
148 | #endif | |
149 | ||
150 | if (absZ > 2.05*outerStackLength) | |
151 | return (signZ > 0) ? -2 : -1; // outside supermodule in z direction | |
152 | ||
153 | if (absZ < outerStackLength) | |
154 | return (signZ > 0) ? 1 : 3; | |
155 | else | |
156 | return (signZ > 0) ? 0 : 4; | |
157 | ||
158 | } | |
159 | ||
160 | Short_t AliTRDonlineTrackMatching::EstimateStack(const Double_t globalCoords[3]) { | |
161 | ||
162 | // returns the closest TRD stack to a 3D position in global coordinates | |
163 | ||
164 | Short_t sec = EstimateSector(globalCoords); | |
165 | Short_t st = EstimateLocalStack(globalCoords); | |
166 | #ifdef TRD_TM_DEBUG | |
167 | printf("EstimateStack sec %d st %d\n", sec, st); | |
168 | #endif | |
169 | if ((sec < 0) || (st < 0)) | |
170 | return -1; | |
171 | else | |
172 | return 5*sec + st; | |
173 | } | |
174 | ||
6403ed35 | 175 | Bool_t AliTRDonlineTrackMatching::StackToTrack(const AliExternalTrackParam *track, Short_t &stack, UShort_t &layersWithTracklet, Double_t magFieldinKiloGauss){ |
30bd9a5a | 176 | |
177 | // returns stack to track param | |
178 | ||
179 | stack = -1; | |
180 | layersWithTracklet = 0; | |
181 | ||
182 | UInt_t stackHits[fgkTrdStacks]; | |
183 | Double_t x[3]; | |
184 | memset(stackHits, 0, fgkTrdStacks*sizeof(UInt_t)); | |
185 | ||
186 | #ifdef TRD_TM_DEBUG | |
187 | printf("STACK-TO-TRACK\n"); | |
188 | #endif | |
189 | ||
190 | Double_t r = fgkSaveInnerRadius; | |
191 | while (r < fgkSaveOuterRadius){ | |
192 | track->GetXYZAt(r, magFieldinKiloGauss, x); | |
193 | stack = EstimateStack(x); | |
194 | if (stack >= 0){ | |
195 | stackHits[stack]++; | |
196 | if (stackHits[stack] > 16) // experimental | |
197 | break; | |
198 | #ifdef TRD_TM_DEBUG | |
199 | printf(" r=%.3fcm %.2f/%.2f - %d hits for stack %d S%02d-%d (mag=%.1f)\n", | |
200 | r, x[0], x[1], stackHits[stack], stack, stack/5, stack%5, magFieldinKiloGauss); | |
201 | #endif | |
202 | } | |
203 | r += 1.; | |
204 | } | |
205 | ||
206 | // find stack with most hits | |
207 | UInt_t bestHits = 0; | |
208 | for (UShort_t iStack = 0; iStack < fgkTrdStacks; ++iStack){ | |
209 | if (stackHits[iStack] == 0) | |
210 | continue; | |
211 | #ifdef TRD_TM_DEBUG | |
212 | printf(" finally %d hits in stack S%02d-%d\n", stackHits[iStack], iStack/5, iStack%5); | |
213 | #endif | |
214 | if (stackHits[iStack] > bestHits){ | |
215 | bestHits = stackHits[iStack]; | |
216 | stack = iStack; | |
217 | } | |
218 | } | |
219 | ||
220 | if (stack >= 0){ | |
221 | #ifdef TRD_TM_DEBUG | |
222 | printf("best stack: S%02d-%d\n", TrdLsiSec(stack), TrdLsiSi(stack)); | |
223 | #endif | |
224 | return kTRUE; | |
225 | } | |
226 | ||
227 | return kFALSE; | |
228 | } | |
229 | ||
6403ed35 | 230 | Bool_t AliTRDonlineTrackMatching::StackToTrack(const AliESDtrack* track, Short_t &stack, UShort_t &layersWithTracklet, Double_t magFieldinKiloGauss){ |
30bd9a5a | 231 | |
232 | // returns stack to ESD track | |
233 | ||
234 | if (track->GetOuterParam()) | |
235 | return StackToTrack(track->GetOuterParam(), stack, layersWithTracklet, magFieldinKiloGauss); | |
236 | else if (track->GetInnerParam()) | |
237 | return StackToTrack(track->GetInnerParam(), stack, layersWithTracklet, magFieldinKiloGauss); | |
238 | else | |
239 | return StackToTrack(track, stack, layersWithTracklet, magFieldinKiloGauss); | |
240 | } | |
241 | ||
242 | Bool_t AliTRDonlineTrackMatching::AcceptTrack(const AliESDtrack* esdTrack, const AliESDEvent* esdEvent){ | |
243 | ||
244 | // returns result ESD track cuts | |
245 | ||
ca892663 | 246 | if (!esdTrack) |
247 | return kFALSE; | |
248 | ||
249 | UInt_t status = esdTrack->GetStatus(); | |
30bd9a5a | 250 | |
251 | if (fEsdTrackCutMinimal){ | |
252 | return ((status & AliESDtrack::kTPCout) > 0); | |
253 | } | |
254 | ||
255 | // require TPC fit | |
256 | if ((fEsdTrackCutRequireTPCrefit) && (!(status & AliESDtrack::kTPCrefit))) | |
257 | return kFALSE; | |
258 | ||
259 | // require ITS re-fit | |
260 | if ((fEsdTrackCutRequireITSrefit) && (!(status & AliESDtrack::kITSrefit))) | |
261 | return kFALSE; | |
262 | ||
263 | // TPC requirements | |
264 | Float_t nCrossedRowsTPC = esdTrack->GetTPCCrossedRows(); | |
265 | Float_t ratioCrossedRowsOverFindableClustersTPC = | |
266 | (esdTrack->GetTPCNclsF() > 0) ? (nCrossedRowsTPC / esdTrack->GetTPCNclsF()) : 1.0; | |
267 | Float_t chi2PerClusterTPC = | |
268 | (esdTrack->GetTPCclusters(0) > 0) ? (esdTrack->GetTPCchi2()/Float_t(esdTrack->GetTPCclusters(0))) : 100.; | |
269 | ||
270 | if ( | |
271 | (nCrossedRowsTPC < fEsdTrackCutMinTPCrows) || | |
272 | (ratioCrossedRowsOverFindableClustersTPC < fEsdTrackCutMinRatioRowsFindableClusters) || | |
273 | (chi2PerClusterTPC > fEsdTrackCutMaxChi2TPCclusters) | |
274 | ) | |
275 | return kFALSE; | |
276 | ||
277 | // ITS requirements | |
278 | Float_t chi2PerClusterITS = (esdTrack->GetITSclusters(0) > 0) ? esdTrack->GetITSchi2()/Float_t(esdTrack->GetITSclusters(0)) : 1000.; | |
279 | UShort_t clustersInAnyITSlayer = kFALSE; | |
280 | for (UShort_t layer = 0; layer < 6; ++layer) | |
281 | clustersInAnyITSlayer += (esdTrack->HasPointOnITSLayer(layer) & ((fEsdTrackCutsITSlayerMask >> layer) & 1)); | |
282 | ||
283 | if ((fEsdTrackCutsITSlayerMask != 0) && | |
284 | ((clustersInAnyITSlayer == 0) || (chi2PerClusterITS >= fEsdTrackCutMaxChi2ITSclusters)) | |
285 | ) | |
286 | return kFALSE; | |
287 | ||
288 | // geometric requirements | |
289 | Float_t impactPos[2], impactCov[3]; | |
290 | esdTrack->GetImpactParameters(impactPos, impactCov); | |
291 | ||
292 | if (TMath::Abs(impactPos[0]) > fEsdTrackCutMaxDCAtoVertexXY) | |
293 | return kFALSE; | |
294 | ||
295 | if (TMath::Abs(impactPos[1]) > fEsdTrackCutMaxDCAtoVertexZ) | |
296 | return kFALSE; | |
297 | ||
298 | if (fEsdTrackCutPrim){ | |
299 | // additional requirements for primary tracks | |
300 | ||
301 | const AliESDVertex* vertex = esdEvent->GetPrimaryVertexTracks(); | |
302 | if ((!vertex) || (!vertex->GetStatus())) | |
303 | vertex = esdEvent->GetPrimaryVertexSPD(); | |
304 | ||
305 | Float_t chi2TPCConstrainedVsGlobal = | |
306 | (vertex->GetStatus()) ? esdTrack->GetChi2TPCConstrainedVsGlobal(vertex) : (fEsdTrackVCutsChi2TPCconstrainedVsGlobal + 10.); | |
307 | ||
308 | if (chi2TPCConstrainedVsGlobal > fEsdTrackVCutsChi2TPCconstrainedVsGlobal) | |
309 | return kFALSE; | |
310 | ||
311 | Float_t cutDCAToVertexXYPtDep = | |
312 | fEsdTrackCutPtDCAOfs + fEsdTrackCutPtDCACoeff/((TMath::Abs(esdTrack->Pt()) > 0.0001) ? esdTrack->Pt() : 0.0001); | |
313 | ||
314 | if (TMath::Abs(impactPos[0]) >= cutDCAToVertexXYPtDep) | |
315 | return kFALSE; | |
316 | ||
317 | } | |
318 | ||
319 | return kTRUE; | |
320 | } | |
321 | ||
322 | Bool_t AliTRDonlineTrackMatching::ProcessEvent(AliESDEvent *esdEvent) { | |
323 | ||
324 | // performs track matching for all TRD online tracks of the ESD event | |
325 | ||
326 | UInt_t numTrdTracks = esdEvent->GetNumberOfTrdTracks(); | |
327 | if (numTrdTracks <= 0) | |
328 | return kTRUE; | |
329 | ||
330 | if (!AliGeomManager::GetGeometry()){ | |
633f3ec4 | 331 | AliError("Geometry not available! Skipping TRD track matching."); |
30bd9a5a | 332 | return kFALSE; |
333 | } | |
334 | ||
335 | if (!fTRDgeo){ | |
336 | fTRDgeo = new AliTRDgeometry(); | |
337 | } | |
338 | ||
339 | // | |
340 | // ESD track selection and sorting by TRD stack | |
341 | // | |
342 | ||
343 | UInt_t esdTracksByStack[fgkTrdStacks][fgkMaxEsdTracksPerStack]; | |
344 | UInt_t esdTrackNumByStack[fgkTrdStacks]; | |
345 | memset(esdTrackNumByStack, 0, fgkTrdStacks*sizeof(UInt_t)); | |
346 | ||
347 | UInt_t numEsdTracks = esdEvent->GetNumberOfTracks(); | |
348 | #ifdef TRD_TM_DEBUG | |
349 | UInt_t numEsdTracksAccepted = 0; | |
350 | #endif | |
351 | Short_t stack; | |
352 | UShort_t layers; | |
353 | AliESDtrack* esdTrack; | |
354 | ||
355 | for (UInt_t iEsdTrack = 0; iEsdTrack < numEsdTracks; ++iEsdTrack){ | |
356 | esdTrack = esdEvent->GetTrack(iEsdTrack); | |
357 | ||
358 | if (!esdTrack){ | |
633f3ec4 | 359 | AliError("invalid ESD track!"); |
30bd9a5a | 360 | continue; |
361 | } | |
362 | ||
363 | // track filter here | |
364 | if (!AcceptTrack(esdTrack, esdEvent)) | |
365 | continue; | |
366 | #ifdef TRD_TM_DEBUG | |
367 | else | |
368 | numEsdTracksAccepted++; | |
369 | #endif | |
370 | ||
371 | // assign ESD track to TRD stack | |
372 | if (StackToTrack(esdTrack, stack, layers, esdEvent->GetMagneticField())){ | |
373 | ||
374 | if (stack < 0){ | |
375 | #ifdef TRD_TM_DEBUG | |
376 | printf("#TRACKMATCHING - invalid stack for ESD track\n"); | |
377 | #endif | |
378 | continue; | |
379 | } | |
380 | ||
381 | // register track in relevant stacks | |
382 | Int_t stacksForReg[9] = {-1, -1, -1, -1, -1, -1, -1, -1, -1}; | |
383 | stacksForReg[0] = stack; // stack hit | |
384 | stacksForReg[1] = (stack + 5) % 90; // same stack in next supermodule | |
385 | stacksForReg[2] = (stack - 5); // same stack in previous supermodule | |
386 | if (stacksForReg[2] < 0) | |
387 | stacksForReg[2] += 90; | |
388 | ||
389 | switch(TrdLsiSi(stack)){ | |
390 | case 0: | |
391 | // stack 0 | |
392 | stacksForReg[3] = stack + 1; // next stack in same supermodule | |
393 | stacksForReg[4] = stacksForReg[1] + 1; // next stack in next supermodule | |
394 | stacksForReg[5] = stacksForReg[2] + 1; // next stack in previous supermodule | |
395 | break; | |
396 | case 1: | |
397 | case 2: | |
398 | case 3: | |
399 | stacksForReg[3] = stack + 1; // next stack in same supermodule | |
400 | stacksForReg[4] = stacksForReg[1] + 1; // next stack in next supermodule | |
401 | stacksForReg[5] = stacksForReg[2] + 1; // next stack in previous supermodule | |
402 | stacksForReg[6] = stack - 1; // previous stack in same supermodule | |
403 | stacksForReg[7] = stacksForReg[1] - 1; // previous stack in next supermodule | |
404 | stacksForReg[8] = stacksForReg[2] - 1; // previous stack in previous supermodule | |
405 | break; | |
406 | case 4: | |
407 | stacksForReg[3] = stack - 1; // previous stack in same supermodule | |
408 | stacksForReg[4] = stacksForReg[1] - 1; // previous stack in next supermodule | |
409 | stacksForReg[5] = stacksForReg[2] - 1; // previous stack in previous supermodule | |
410 | break; | |
411 | default: | |
412 | break; | |
413 | } | |
414 | ||
415 | #ifdef TRD_TM_DEBUG | |
416 | printf("#TRACKMATCHING - assigned ESD track %d to following TRD stacks:", iEsdTrack); | |
417 | #endif | |
418 | ||
419 | // register for stacks | |
420 | for (UShort_t iReg = 0; iReg < 9; ++iReg){ | |
421 | if (stacksForReg[iReg] < 0) | |
422 | break; | |
423 | ||
424 | if (stacksForReg[iReg] >= 90){ | |
633f3ec4 | 425 | AliError(Form("invalid stack for registration: %i", stacksForReg[iReg])); |
30bd9a5a | 426 | continue; |
427 | } | |
428 | ||
429 | if (esdTrackNumByStack[stacksForReg[iReg]] < fgkMaxEsdTracksPerStack - 1) | |
430 | esdTracksByStack[stacksForReg[iReg]][esdTrackNumByStack[stacksForReg[iReg]]++] = iEsdTrack; | |
431 | #ifdef TRD_TM_DEBUG | |
432 | else | |
433 | printf("#TRACKMATCHING - maximum number (%d) of ESD tracks per stack reached for S%02d-%d (%d tracks total). Skipping track!\n", | |
434 | fgkMaxEsdTracksPerStack, TrdLsiSec(stacksForReg[iReg]), TrdLsiSi(stacksForReg[iReg]), numEsdTracks); | |
435 | printf(" S%02d-%d", TrdLsiSec(stacksForReg[iReg]), TrdLsiSi(stacksForReg[iReg])); | |
436 | #endif | |
437 | } | |
438 | #ifdef TRD_TM_DEBUG | |
439 | printf(" (ESD-ASSIGN)\n"); | |
440 | #endif | |
441 | ||
442 | // if (esdTrackNumByStack[stack] >= fgkMaxEsdTracksPerStack){ | |
443 | //#ifdef TRD_TM_DEBUG | |
444 | // printf("#TRACKMATCHING - maximum number (%d) of ESD tracks per stack reached for S%02d-%d (%d tracks total). Skipping track!\n", | |
445 | // fgkMaxEsdTracksPerStack, TrdLsiSec(stack), TrdLsiSi(stack), numEsdTracks); | |
446 | //#endif | |
447 | // continue; | |
448 | // } | |
449 | // | |
450 | // esdTracksByStack[stack][esdTrackNumByStack[stack]++] = iEsdTrack; | |
451 | //#ifdef TRD_TM_DEBUG | |
452 | // printf("#TRACKMATCHING - assigned ESD track %d to TRD stack S%02d-%d\n", | |
453 | // iEsdTrack, TrdLsiSec(stack), TrdLsiSi(stack)); | |
454 | //#endif | |
455 | } | |
456 | ||
457 | } // loop over esd tracks | |
458 | ||
459 | #ifdef TRD_TM_DEBUG | |
460 | printf("#TRACKMATCHING - %d ESD tracks accepted, %d rejected\n", | |
461 | numEsdTracksAccepted, numEsdTracks - numEsdTracksAccepted); | |
462 | #endif | |
463 | ||
464 | // | |
465 | // search matching ESD track for each TRD online track | |
466 | // | |
467 | AliESDTrdTrack* trdTrack; | |
468 | Double_t trdPt; | |
469 | AliESDtrack* matchCandidate; | |
470 | AliESDtrack* matchTrack; | |
471 | Int_t matchEsdTrackIndexInStack; | |
472 | Double_t matchRating; | |
473 | Int_t matchCandidateCount; | |
474 | Double_t distY, distZ; | |
475 | ||
476 | for (UInt_t iTrdTrack = 0; iTrdTrack < numTrdTracks; ++iTrdTrack){ | |
477 | ||
478 | trdTrack = esdEvent->GetTrdTrack(iTrdTrack); | |
479 | stack = TrdSecSiLsi(trdTrack->GetSector(), trdTrack->GetStack()); | |
480 | trdPt = (esdEvent->GetMagneticField() > 0.) ? (-1.*trdTrack->Pt()) : trdTrack->Pt(); | |
481 | matchTrack = NULL; | |
482 | matchEsdTrackIndexInStack = -1; | |
483 | matchRating = 0.; | |
484 | matchCandidateCount = 0; | |
485 | ||
486 | #ifdef TRD_TM_DEBUG | |
487 | printf("#TRACKMATCHING - trying to match TRD online track %d in S%02d-%d\n", | |
488 | iTrdTrack, trdTrack->GetSector(), trdTrack->GetStack()); | |
489 | #endif | |
490 | ||
491 | // loop over all esd tracks in the same stack and check distance | |
492 | for (UInt_t iEsdTrack = 0; iEsdTrack < esdTrackNumByStack[stack]; ++iEsdTrack){ | |
493 | matchCandidate = esdEvent->GetTrack(esdTracksByStack[stack][iEsdTrack]); | |
494 | ||
495 | if (EstimateTrackDistance(matchCandidate, trdTrack, esdEvent->GetMagneticField(), &distY, &distZ) == 0){ | |
496 | Double_t rating = RateTrackMatch(distY, distZ, matchCandidate->GetSignedPt(), trdPt); | |
497 | #ifdef TRD_TM_DEBUG | |
498 | printf("#TRACKMATCHING S%02d-%d trd %d - esd %d dy: %.3f dz: %.3f r: %.3f pt e: %.2f t: %.2f match: %d\n", | |
499 | trdTrack->GetSector(), trdTrack->GetStack(), iTrdTrack, iEsdTrack, | |
500 | distY, distZ, rating, matchCandidate->GetSignedPt(), trdPt, | |
501 | (rating >= fMinMatchRating) ? 1 : 0); | |
502 | #endif | |
503 | if (rating > 0.){ | |
504 | // possibly matching pair found | |
505 | matchCandidateCount++; | |
506 | if ((matchTrack == NULL) || (rating > matchRating)){ | |
507 | // new best match | |
508 | matchTrack = matchCandidate; | |
509 | matchEsdTrackIndexInStack = iEsdTrack; | |
510 | matchRating = rating; | |
511 | } | |
512 | } | |
513 | ||
514 | } else { | |
515 | // estimation of distance failed | |
516 | #ifdef TRD_TM_DEBUG | |
517 | printf("TRACKMATCHING S%02d-%d trd %d - esd %d failed\n", | |
518 | trdTrack->GetSector(), trdTrack->GetStack(), iTrdTrack, iEsdTrack); | |
519 | #endif | |
520 | } | |
521 | } // loop over esd tracks in same stack | |
522 | ||
523 | if (fHistMatchRating){ | |
524 | fHistMatchRating->Fill(matchRating); | |
525 | } | |
526 | ||
527 | if ((matchTrack) && (matchRating >= fMinMatchRating)){ | |
528 | #ifdef TRD_TM_DEBUG | |
529 | printf("#TRACKMATCHING S%02d-%d trd %d - esd %d match! pt: %.2f %.2f\n", | |
530 | trdTrack->GetSector(), trdTrack->GetStack(), iTrdTrack, matchEsdTrackIndexInStack, | |
531 | trdPt, matchTrack->GetSignedPt()); | |
532 | #endif | |
533 | trdTrack->SetTrackMatchReference(matchTrack); | |
534 | } else | |
535 | trdTrack->SetTrackMatchReference(NULL); | |
536 | ||
537 | } // loop over TRD online tracks | |
538 | ||
539 | return kTRUE; | |
540 | } | |
541 | ||
542 | Bool_t AliTRDonlineTrackMatching::TrackPlaneIntersect(AliExternalTrackParam *trk, Double_t pnt[3], Double_t norm[3], Double_t mag){ | |
543 | ||
544 | // calculates the intersection point of a track param and a plane defined by point pnt and normal vector norm | |
545 | ||
546 | UInt_t its = 0; | |
547 | Double_t r = 290.; | |
548 | Double_t step = 10.; | |
549 | Int_t flag = 0; | |
550 | Double_t dist = 0, dist_prev = 0; | |
551 | Double_t x[3] = {0., 0., 0.}; | |
552 | ||
553 | dist = (x[0] - pnt[0]) * norm[0] + (x[1] - pnt[1]) *norm[1] + (x[2] - pnt[2]) * norm[2]; | |
554 | ||
555 | while(TMath::Abs(dist) > 0.1) { | |
556 | ||
557 | trk->GetXYZAt(r, mag, x); | |
558 | ||
559 | if ((x[0] * x[0] + x[1] * x[1]) < 100.) // extrapolation to radius failed | |
560 | return kFALSE; | |
561 | ||
562 | //distance between current track position and plane | |
563 | dist_prev = TMath::Abs(dist); | |
564 | dist = (x[0] - pnt[0]) * norm[0] + (x[1] - pnt[1]) * norm[1]; | |
565 | if ((flag) && (TMath::Abs(dist) > dist_prev)){ | |
566 | step /= -2.; | |
567 | } | |
568 | flag=1; | |
569 | r += step; | |
570 | its++; | |
571 | if ((r > 380.) || (r < 100.) || (its > 100) || (TMath::Abs(step) < 0.00001)){ | |
572 | break; | |
573 | } | |
574 | } | |
575 | for (Int_t i=0; i<3; i++) | |
576 | pnt[i] = x[i]; | |
577 | ||
578 | return kTRUE; | |
579 | } | |
580 | ||
581 | Int_t AliTRDonlineTrackMatching::EstimateTrackDistance(AliESDtrack *esd_track, AliESDTrdTrack* gtu_track, Double_t mag, Double_t *ydist, Double_t *zdist){ | |
582 | ||
583 | // returns an estimate for the spatial distance between TPC offline track and GTU online track | |
584 | ||
585 | if ((!esd_track) || (!gtu_track)) | |
586 | return -3; | |
587 | ||
588 | // AssertTRDGeometry(); | |
589 | if (!fTRDgeo) | |
590 | fTRDgeo = new AliTRDgeometry(); | |
591 | ||
592 | Float_t diff_y = 0; | |
593 | Float_t diff_z = 0; | |
594 | Int_t nLayers = 0; | |
595 | Double_t xtrkl[3]; | |
596 | Double_t ptrkl[3]; | |
597 | Double_t ptrkl2[3]; | |
598 | UInt_t trklDet; | |
599 | UShort_t trklLayer; | |
600 | UInt_t stack_gtu; | |
601 | UShort_t stackInSector; | |
602 | ||
603 | for (UShort_t iLayer = 0; iLayer < 6; iLayer++){ | |
604 | AliESDTrdTracklet* trkl = gtu_track->GetTracklet(iLayer); | |
605 | if (trkl){ | |
606 | trklDet = trkl->GetDetector(); | |
607 | trklLayer = TrdDetLyr(trklDet); | |
608 | stack_gtu = TrdDetLsi(trklDet); | |
609 | stackInSector = TrdDetSi(trklDet); | |
610 | ||
611 | // local coordinates of the outer end point of the tracklet | |
612 | xtrkl[0] = AliTRDgeometry::AnodePos(); | |
613 | xtrkl[1] = trkl->GetLocalY(); | |
614 | ||
615 | if(stackInSector == 2){ // corrected version by Felix Muecke | |
616 | xtrkl[2] = fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(trkl->GetBinZ()) - | |
617 | (fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowSize(trkl->GetBinZ()))/2. - | |
618 | fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(6); | |
619 | } else { | |
620 | xtrkl[2] = fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(trkl->GetBinZ()) - | |
621 | (fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowSize(trkl->GetBinZ()))/2. - | |
622 | fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(8); | |
623 | } | |
624 | ||
625 | // old draft version | |
626 | // xtrkl[2] = fTRDgeo->GetPadPlane(trklLayer, (trklDet/6) % 5)->GetRowPos(trkl->GetBinZ()) - | |
627 | // fTRDgeo->GetPadPlane(trklLayer, (trklDet/6) % 5)->GetRowSize(trkl->GetBinZ()) - | |
628 | // fTRDgeo->GetPadPlane(trklLayer, (trklDet/6) % 5)->GetRowPos(8); | |
629 | ||
630 | // transform to global coordinates | |
631 | TGeoHMatrix *matrix = fTRDgeo->GetClusterMatrix(trklDet); | |
632 | if (!matrix){ | |
633f3ec4 | 633 | if ((stack_gtu != 13*5+2) && (stack_gtu != 14*5+2) && (stack_gtu != 15*5+2)) |
aa67162b | 634 | AliDebug(1, Form("invalid TRD cluster matrix in EstimateTrackDistance for detector %i", trklDet)); |
30bd9a5a | 635 | return -5; |
636 | } | |
637 | matrix->LocalToMaster(xtrkl, ptrkl); | |
638 | fTRDgeo->RotateBack(gtu_track->GetSector() * 30, ptrkl, ptrkl2); // ptrkl2 now contains the global position of the outer end point of the tracklet | |
639 | ||
640 | // calculate parameterization of plane representing the tracklets layer | |
641 | Double_t layer_zero_local[3] = {0., 0., 0.}; | |
642 | Double_t layer_zero_global[3], layer_zero_global2[3]; | |
643 | ||
644 | matrix->LocalToMaster(layer_zero_local, layer_zero_global); | |
645 | fTRDgeo->RotateBack(trklDet, layer_zero_global, layer_zero_global2); // layer_zero_global2 points to chamber origin in global coords | |
646 | ||
647 | Double_t layer_ref_local[3] = {AliTRDgeometry::AnodePos(), 0., 0.}; | |
648 | Double_t layer_ref_global[3], layer_ref_global2[3]; | |
649 | ||
650 | matrix->LocalToMaster(layer_ref_local, layer_ref_global); | |
651 | fTRDgeo->RotateBack(trklDet, layer_ref_global, layer_ref_global2); // layer_ref_global2 points to center anode pos within plane in global coords | |
652 | ||
653 | Double_t n0[3] = {layer_ref_global2[0]-layer_zero_global2[0], | |
654 | layer_ref_global2[1]-layer_zero_global2[1], | |
655 | layer_ref_global2[2]-layer_zero_global2[2]}; | |
656 | ||
657 | Double_t n_len = TMath::Sqrt(n0[0]*n0[0] + n0[1]*n0[1] + n0[2]*n0[2]); | |
658 | if (n_len == 0.){ // This should never happen | |
633f3ec4 | 659 | AliError("divison by zero in estimate_track_distance!"); |
30bd9a5a | 660 | n_len = 1.; |
661 | } | |
662 | Double_t n[3] = {n0[0]/n_len, n0[1]/n_len, n0[2]/n_len}; // normal vector of plane | |
663 | ||
664 | AliExternalTrackParam *outerTPC = new AliExternalTrackParam(*(esd_track->GetOuterParam())); | |
665 | Bool_t isects = TrackPlaneIntersect(outerTPC, layer_ref_global2, n, mag); // find intersection point between track and TRD layer | |
666 | delete outerTPC; | |
667 | outerTPC = NULL; | |
668 | ||
669 | if (isects == kFALSE){ // extrapolation fails, because track never reaches the TRD radius | |
670 | return -1; | |
671 | } | |
672 | ||
673 | Double_t m[2] = {ptrkl2[0] - layer_ref_global2[0], ptrkl2[1] - layer_ref_global2[1]}; | |
674 | Double_t len_m = TMath::Sqrt(m[0]*m[0] + m[1]*m[1]); | |
675 | diff_y += len_m; | |
676 | diff_z += TMath::Abs(ptrkl2[2] - layer_ref_global2[2]); | |
677 | nLayers++; | |
678 | } | |
679 | } | |
680 | ||
681 | if (nLayers > 0){ | |
682 | *ydist = diff_y / nLayers; | |
683 | *zdist = diff_z / nLayers; | |
684 | return 0; | |
685 | } | |
686 | else | |
687 | return -4; | |
688 | } | |
689 | ||
6403ed35 | 690 | Double_t AliTRDonlineTrackMatching::PtDiffRel(Double_t refPt, Double_t gtuPt){ |
30bd9a5a | 691 | |
692 | // return relative pt difference | |
693 | ||
694 | if (TMath::Abs(refPt) > 0.000001){ | |
695 | return (gtuPt - refPt) / refPt; | |
696 | } else | |
697 | return 0.; | |
698 | } | |
699 | ||
700 | ||
6403ed35 | 701 | Double_t AliTRDonlineTrackMatching::RateTrackMatch(Double_t distY, Double_t distZ, Double_t rpt, Double_t gpt){ |
30bd9a5a | 702 | |
703 | // returns a match rating derived from Y and Z distance as well as pt difference | |
704 | ||
705 | // maximum limits for spatial distance | |
706 | if ((distY > 5.) || (distZ > 20.)) | |
707 | return 0.; | |
708 | ||
709 | // same pt sign required | |
710 | if ((rpt * gpt) < 0.) | |
711 | return 0.; | |
712 | ||
713 | Double_t rating_distY = -0.1 * distY + 1.; | |
714 | Double_t rating_distZ = -0.025 * distZ + 1.; | |
715 | Double_t rating_ptDiff = 1. - TMath::Abs(PtDiffRel(rpt, gpt)); | |
716 | ||
717 | if (rating_ptDiff < 0.) | |
718 | rating_ptDiff = 0.2; | |
719 | ||
720 | Double_t total = rating_distY * rating_distZ * rating_ptDiff; | |
721 | ||
722 | #ifdef TRD_TM_DEBUG | |
723 | if (total > 1.){ | |
724 | printf("<ERROR> track match rating exceeds limit of 1.0: %.3f", total); | |
725 | } | |
726 | #endif | |
727 | ||
728 | return total; | |
729 | } | |
730 | ||
731 | ||
732 | void AliTRDonlineTrackMatching::SetEsdTrackDefaultCuts(const char* cutIdent) { | |
733 | ||
734 | if (strcmp(cutIdent, "strict") == 0){ | |
735 | ||
736 | #ifdef TRD_TM_DEBUG | |
737 | printf("AliTRDonlineTrackMatching -- default track cuts selected"); | |
738 | #endif | |
739 | ||
740 | fEsdTrackCutMinimal = kFALSE; | |
741 | fEsdTrackCutPrim = kFALSE; | |
742 | ||
743 | fEsdTrackCutMinTPCrows = 70; | |
744 | fEsdTrackCutRequireTPCrefit = kTRUE; | |
745 | fEsdTrackCutMinRatioRowsFindableClusters = 0.8; | |
746 | fEsdTrackCutMaxChi2TPCclusters = 4.; | |
747 | fEsdTrackVCutsChi2TPCconstrainedVsGlobal = 36.; | |
748 | ||
749 | fEsdTrackCutRequireITSrefit = kFALSE; | |
750 | fEsdTrackCutMaxChi2ITSclusters = 36.; | |
751 | ||
752 | fEsdTrackCutMaxDCAtoVertexXY = 1000.; | |
753 | fEsdTrackCutMaxDCAtoVertexZ = 2.; | |
754 | fEsdTrackCutsITSlayerMask = 0x0; | |
755 | ||
756 | fEsdTrackCutPtDCAOfs = 0.0105; | |
757 | fEsdTrackCutPtDCACoeff = 0.0350; | |
758 | } else if (strcmp(cutIdent, "minimal") == 0){ | |
759 | ||
760 | #ifdef TRD_TM_DEBUG | |
761 | printf("AliTRDonlineTrackMatching -- minimal track cuts selected\n"); | |
762 | #endif | |
763 | ||
764 | fEsdTrackCutMinimal = kFALSE; | |
765 | fEsdTrackCutPrim = kFALSE; | |
766 | ||
767 | fEsdTrackCutMinTPCrows = 70; | |
768 | fEsdTrackCutRequireTPCrefit = kTRUE; | |
769 | fEsdTrackCutMinRatioRowsFindableClusters = 0.; | |
770 | fEsdTrackCutMaxChi2TPCclusters = 100.; | |
771 | fEsdTrackVCutsChi2TPCconstrainedVsGlobal = 1000.; | |
772 | ||
773 | fEsdTrackCutRequireITSrefit = kFALSE; | |
774 | fEsdTrackCutMaxChi2ITSclusters = 0.; | |
775 | ||
776 | fEsdTrackCutMaxDCAtoVertexXY = 1000.; | |
777 | fEsdTrackCutMaxDCAtoVertexZ = 1000.; | |
778 | fEsdTrackCutsITSlayerMask = 0x0; | |
779 | } else | |
633f3ec4 | 780 | AliErrorClass("invalid cut set"); |
781 | ||
30bd9a5a | 782 | } |