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- make nested classes in AliTRDtrapConfig public for cling compatible I/O
[u/mrichter/AliRoot.git] / TRD / AliTRDonlineTrackMatching.cxx
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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
34const Float_t AliTRDonlineTrackMatching::fgkSaveInnerRadius = 290.5;
35const Float_t AliTRDonlineTrackMatching::fgkSaveOuterRadius = 364.5;
36
37Float_t AliTRDonlineTrackMatching::fEsdTrackCutMinTPCrows = 0.;
38Float_t AliTRDonlineTrackMatching::fEsdTrackCutMinRatioRowsFindableClusters = 0.;
39Float_t AliTRDonlineTrackMatching::fEsdTrackCutMaxChi2TPCclusters = 0.;
40Float_t AliTRDonlineTrackMatching::fEsdTrackCutMaxChi2ITSclusters = 0.;
41Float_t AliTRDonlineTrackMatching::fEsdTrackCutMaxDCAtoVertexXY = 0.;
42Float_t AliTRDonlineTrackMatching::fEsdTrackCutMaxDCAtoVertexZ = 0.;
43UShort_t AliTRDonlineTrackMatching::fEsdTrackCutsITSlayerMask = 0; // similar to 2011 default cut: 0x3
44Float_t AliTRDonlineTrackMatching::fEsdTrackVCutsChi2TPCconstrainedVsGlobal = 0.;
45Float_t AliTRDonlineTrackMatching::fEsdTrackCutPtDCAOfs = 0.;
46Float_t AliTRDonlineTrackMatching::fEsdTrackCutPtDCACoeff = 0.;
47Bool_t AliTRDonlineTrackMatching::fEsdTrackCutMinimal = kFALSE;
48Bool_t AliTRDonlineTrackMatching::fEsdTrackCutRequireTPCrefit = kTRUE;
49Bool_t AliTRDonlineTrackMatching::fEsdTrackCutRequireITSrefit = kFALSE;
50Bool_t AliTRDonlineTrackMatching::fEsdTrackCutPrim = kFALSE;
51
52AliTRDonlineTrackMatching::AliTRDonlineTrackMatching() :
633f3ec4 53 TObject(),
30bd9a5a 54 fTRDgeo(NULL),
55 fMinMatchRating(0.25),
56 fHistMatchRating(NULL)
57{
58 // default ctor
59 SetEsdTrackDefaultCuts("minimal");
60}
61
62AliTRDonlineTrackMatching::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
71AliTRDonlineTrackMatching::~AliTRDonlineTrackMatching() {
72
73 // dtor
74
75 delete fTRDgeo;
76 fTRDgeo = NULL;
77}
78
79Short_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 107Short_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
120Short_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
160Short_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 175Bool_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 230Bool_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
242Bool_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
322Bool_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
542Bool_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
581Int_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
c433ad04 664 const AliExternalTrackParam *trackParam = esd_track->GetOuterParam();
665 if (!trackParam) {
666 trackParam = esd_track->GetInnerParam();
667 if (!trackParam)
668 trackParam = esd_track;
669 }
670
671 AliExternalTrackParam *outerTPC = new AliExternalTrackParam(*trackParam);
30bd9a5a 672 Bool_t isects = TrackPlaneIntersect(outerTPC, layer_ref_global2, n, mag); // find intersection point between track and TRD layer
673 delete outerTPC;
674 outerTPC = NULL;
675
676 if (isects == kFALSE){ // extrapolation fails, because track never reaches the TRD radius
677 return -1;
678 }
679
680 Double_t m[2] = {ptrkl2[0] - layer_ref_global2[0], ptrkl2[1] - layer_ref_global2[1]};
681 Double_t len_m = TMath::Sqrt(m[0]*m[0] + m[1]*m[1]);
682 diff_y += len_m;
683 diff_z += TMath::Abs(ptrkl2[2] - layer_ref_global2[2]);
684 nLayers++;
685 }
686 }
687
688 if (nLayers > 0){
689 *ydist = diff_y / nLayers;
690 *zdist = diff_z / nLayers;
691 return 0;
692 }
693 else
694 return -4;
695}
696
6403ed35 697Double_t AliTRDonlineTrackMatching::PtDiffRel(Double_t refPt, Double_t gtuPt){
30bd9a5a 698
699 // return relative pt difference
700
701 if (TMath::Abs(refPt) > 0.000001){
702 return (gtuPt - refPt) / refPt;
703 } else
704 return 0.;
705}
706
707
6403ed35 708Double_t AliTRDonlineTrackMatching::RateTrackMatch(Double_t distY, Double_t distZ, Double_t rpt, Double_t gpt){
30bd9a5a 709
710 // returns a match rating derived from Y and Z distance as well as pt difference
711
712 // maximum limits for spatial distance
713 if ((distY > 5.) || (distZ > 20.))
714 return 0.;
715
716 // same pt sign required
717 if ((rpt * gpt) < 0.)
718 return 0.;
719
720 Double_t rating_distY = -0.1 * distY + 1.;
721 Double_t rating_distZ = -0.025 * distZ + 1.;
722 Double_t rating_ptDiff = 1. - TMath::Abs(PtDiffRel(rpt, gpt));
723
724 if (rating_ptDiff < 0.)
725 rating_ptDiff = 0.2;
726
727 Double_t total = rating_distY * rating_distZ * rating_ptDiff;
728
729#ifdef TRD_TM_DEBUG
730 if (total > 1.){
731 printf("<ERROR> track match rating exceeds limit of 1.0: %.3f", total);
732 }
733#endif
734
735 return total;
736}
737
738
739void AliTRDonlineTrackMatching::SetEsdTrackDefaultCuts(const char* cutIdent) {
740
741 if (strcmp(cutIdent, "strict") == 0){
742
743#ifdef TRD_TM_DEBUG
744 printf("AliTRDonlineTrackMatching -- default track cuts selected");
745#endif
746
747 fEsdTrackCutMinimal = kFALSE;
748 fEsdTrackCutPrim = kFALSE;
749
750 fEsdTrackCutMinTPCrows = 70;
751 fEsdTrackCutRequireTPCrefit = kTRUE;
752 fEsdTrackCutMinRatioRowsFindableClusters = 0.8;
753 fEsdTrackCutMaxChi2TPCclusters = 4.;
754 fEsdTrackVCutsChi2TPCconstrainedVsGlobal = 36.;
755
756 fEsdTrackCutRequireITSrefit = kFALSE;
757 fEsdTrackCutMaxChi2ITSclusters = 36.;
758
759 fEsdTrackCutMaxDCAtoVertexXY = 1000.;
760 fEsdTrackCutMaxDCAtoVertexZ = 2.;
761 fEsdTrackCutsITSlayerMask = 0x0;
762
763 fEsdTrackCutPtDCAOfs = 0.0105;
764 fEsdTrackCutPtDCACoeff = 0.0350;
765 } else if (strcmp(cutIdent, "minimal") == 0){
766
767#ifdef TRD_TM_DEBUG
768 printf("AliTRDonlineTrackMatching -- minimal track cuts selected\n");
769#endif
770
771 fEsdTrackCutMinimal = kFALSE;
772 fEsdTrackCutPrim = kFALSE;
773
774 fEsdTrackCutMinTPCrows = 70;
775 fEsdTrackCutRequireTPCrefit = kTRUE;
776 fEsdTrackCutMinRatioRowsFindableClusters = 0.;
777 fEsdTrackCutMaxChi2TPCclusters = 100.;
778 fEsdTrackVCutsChi2TPCconstrainedVsGlobal = 1000.;
779
780 fEsdTrackCutRequireITSrefit = kFALSE;
781 fEsdTrackCutMaxChi2ITSclusters = 0.;
782
783 fEsdTrackCutMaxDCAtoVertexXY = 1000.;
784 fEsdTrackCutMaxDCAtoVertexZ = 1000.;
785 fEsdTrackCutsITSlayerMask = 0x0;
786 } else
633f3ec4 787 AliErrorClass("invalid cut set");
788
30bd9a5a 789}