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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];
5d889c14 183 Double_t x[3] = { 0. };
30bd9a5a 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){
5d889c14 192 if (track->GetXYZAt(r, magFieldinKiloGauss, x)) {
193 stack = EstimateStack(x);
194 if (stack >= 0){
195 stackHits[stack]++;
196 if (stackHits[stack] > 16) // experimental
197 break;
30bd9a5a 198#ifdef TRD_TM_DEBUG
5d889c14 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);
30bd9a5a 201#endif
5d889c14 202 }
30bd9a5a 203 }
204 r += 1.;
205 }
206
207 // find stack with most hits
208 UInt_t bestHits = 0;
209 for (UShort_t iStack = 0; iStack < fgkTrdStacks; ++iStack){
210 if (stackHits[iStack] == 0)
211 continue;
212#ifdef TRD_TM_DEBUG
213 printf(" finally %d hits in stack S%02d-%d\n", stackHits[iStack], iStack/5, iStack%5);
214#endif
215 if (stackHits[iStack] > bestHits){
216 bestHits = stackHits[iStack];
217 stack = iStack;
218 }
219 }
220
221 if (stack >= 0){
222#ifdef TRD_TM_DEBUG
223 printf("best stack: S%02d-%d\n", TrdLsiSec(stack), TrdLsiSi(stack));
224#endif
225 return kTRUE;
226 }
227
228 return kFALSE;
229}
230
6403ed35 231Bool_t AliTRDonlineTrackMatching::StackToTrack(const AliESDtrack* track, Short_t &stack, UShort_t &layersWithTracklet, Double_t magFieldinKiloGauss){
30bd9a5a 232
233 // returns stack to ESD track
234
235 if (track->GetOuterParam())
236 return StackToTrack(track->GetOuterParam(), stack, layersWithTracklet, magFieldinKiloGauss);
237 else if (track->GetInnerParam())
238 return StackToTrack(track->GetInnerParam(), stack, layersWithTracklet, magFieldinKiloGauss);
239 else
240 return StackToTrack(track, stack, layersWithTracklet, magFieldinKiloGauss);
241}
242
243Bool_t AliTRDonlineTrackMatching::AcceptTrack(const AliESDtrack* esdTrack, const AliESDEvent* esdEvent){
244
245 // returns result ESD track cuts
246
ca892663 247 if (!esdTrack)
248 return kFALSE;
249
250 UInt_t status = esdTrack->GetStatus();
30bd9a5a 251
252 if (fEsdTrackCutMinimal){
253 return ((status & AliESDtrack::kTPCout) > 0);
254 }
255
256 // require TPC fit
257 if ((fEsdTrackCutRequireTPCrefit) && (!(status & AliESDtrack::kTPCrefit)))
258 return kFALSE;
259
260 // require ITS re-fit
261 if ((fEsdTrackCutRequireITSrefit) && (!(status & AliESDtrack::kITSrefit)))
262 return kFALSE;
263
264 // TPC requirements
265 Float_t nCrossedRowsTPC = esdTrack->GetTPCCrossedRows();
266 Float_t ratioCrossedRowsOverFindableClustersTPC =
267 (esdTrack->GetTPCNclsF() > 0) ? (nCrossedRowsTPC / esdTrack->GetTPCNclsF()) : 1.0;
268 Float_t chi2PerClusterTPC =
269 (esdTrack->GetTPCclusters(0) > 0) ? (esdTrack->GetTPCchi2()/Float_t(esdTrack->GetTPCclusters(0))) : 100.;
270
271 if (
272 (nCrossedRowsTPC < fEsdTrackCutMinTPCrows) ||
273 (ratioCrossedRowsOverFindableClustersTPC < fEsdTrackCutMinRatioRowsFindableClusters) ||
274 (chi2PerClusterTPC > fEsdTrackCutMaxChi2TPCclusters)
275 )
276 return kFALSE;
277
278 // ITS requirements
279 Float_t chi2PerClusterITS = (esdTrack->GetITSclusters(0) > 0) ? esdTrack->GetITSchi2()/Float_t(esdTrack->GetITSclusters(0)) : 1000.;
280 UShort_t clustersInAnyITSlayer = kFALSE;
281 for (UShort_t layer = 0; layer < 6; ++layer)
282 clustersInAnyITSlayer += (esdTrack->HasPointOnITSLayer(layer) & ((fEsdTrackCutsITSlayerMask >> layer) & 1));
283
284 if ((fEsdTrackCutsITSlayerMask != 0) &&
285 ((clustersInAnyITSlayer == 0) || (chi2PerClusterITS >= fEsdTrackCutMaxChi2ITSclusters))
286 )
287 return kFALSE;
288
289 // geometric requirements
290 Float_t impactPos[2], impactCov[3];
291 esdTrack->GetImpactParameters(impactPos, impactCov);
292
293 if (TMath::Abs(impactPos[0]) > fEsdTrackCutMaxDCAtoVertexXY)
294 return kFALSE;
295
296 if (TMath::Abs(impactPos[1]) > fEsdTrackCutMaxDCAtoVertexZ)
297 return kFALSE;
298
299 if (fEsdTrackCutPrim){
300 // additional requirements for primary tracks
301
302 const AliESDVertex* vertex = esdEvent->GetPrimaryVertexTracks();
303 if ((!vertex) || (!vertex->GetStatus()))
304 vertex = esdEvent->GetPrimaryVertexSPD();
305
306 Float_t chi2TPCConstrainedVsGlobal =
307 (vertex->GetStatus()) ? esdTrack->GetChi2TPCConstrainedVsGlobal(vertex) : (fEsdTrackVCutsChi2TPCconstrainedVsGlobal + 10.);
308
309 if (chi2TPCConstrainedVsGlobal > fEsdTrackVCutsChi2TPCconstrainedVsGlobal)
310 return kFALSE;
311
312 Float_t cutDCAToVertexXYPtDep =
313 fEsdTrackCutPtDCAOfs + fEsdTrackCutPtDCACoeff/((TMath::Abs(esdTrack->Pt()) > 0.0001) ? esdTrack->Pt() : 0.0001);
314
315 if (TMath::Abs(impactPos[0]) >= cutDCAToVertexXYPtDep)
316 return kFALSE;
317
318 }
319
320 return kTRUE;
321}
322
34d48b8f 323Bool_t AliTRDonlineTrackMatching::ProcessEvent(AliESDEvent *esdEvent, Bool_t updateRef, Int_t label) {
30bd9a5a 324
325 // performs track matching for all TRD online tracks of the ESD event
326
327 UInt_t numTrdTracks = esdEvent->GetNumberOfTrdTracks();
328 if (numTrdTracks <= 0)
329 return kTRUE;
330
331 if (!AliGeomManager::GetGeometry()){
633f3ec4 332 AliError("Geometry not available! Skipping TRD track matching.");
30bd9a5a 333 return kFALSE;
334 }
335
336 if (!fTRDgeo){
337 fTRDgeo = new AliTRDgeometry();
338 }
339
340 //
341 // ESD track selection and sorting by TRD stack
342 //
343
344 UInt_t esdTracksByStack[fgkTrdStacks][fgkMaxEsdTracksPerStack];
345 UInt_t esdTrackNumByStack[fgkTrdStacks];
346 memset(esdTrackNumByStack, 0, fgkTrdStacks*sizeof(UInt_t));
347
348 UInt_t numEsdTracks = esdEvent->GetNumberOfTracks();
349#ifdef TRD_TM_DEBUG
350 UInt_t numEsdTracksAccepted = 0;
351#endif
352 Short_t stack;
353 UShort_t layers;
354 AliESDtrack* esdTrack;
355
356 for (UInt_t iEsdTrack = 0; iEsdTrack < numEsdTracks; ++iEsdTrack){
357 esdTrack = esdEvent->GetTrack(iEsdTrack);
358
359 if (!esdTrack){
633f3ec4 360 AliError("invalid ESD track!");
30bd9a5a 361 continue;
362 }
363
364 // track filter here
365 if (!AcceptTrack(esdTrack, esdEvent))
366 continue;
367#ifdef TRD_TM_DEBUG
368 else
369 numEsdTracksAccepted++;
370#endif
371
372 // assign ESD track to TRD stack
373 if (StackToTrack(esdTrack, stack, layers, esdEvent->GetMagneticField())){
374
375 if (stack < 0){
376#ifdef TRD_TM_DEBUG
377 printf("#TRACKMATCHING - invalid stack for ESD track\n");
378#endif
379 continue;
380 }
381
382 // register track in relevant stacks
383 Int_t stacksForReg[9] = {-1, -1, -1, -1, -1, -1, -1, -1, -1};
384 stacksForReg[0] = stack; // stack hit
385 stacksForReg[1] = (stack + 5) % 90; // same stack in next supermodule
386 stacksForReg[2] = (stack - 5); // same stack in previous supermodule
387 if (stacksForReg[2] < 0)
388 stacksForReg[2] += 90;
389
390 switch(TrdLsiSi(stack)){
391 case 0:
392 // stack 0
393 stacksForReg[3] = stack + 1; // next stack in same supermodule
394 stacksForReg[4] = stacksForReg[1] + 1; // next stack in next supermodule
395 stacksForReg[5] = stacksForReg[2] + 1; // next stack in previous supermodule
396 break;
397 case 1:
398 case 2:
399 case 3:
400 stacksForReg[3] = stack + 1; // next stack in same supermodule
401 stacksForReg[4] = stacksForReg[1] + 1; // next stack in next supermodule
402 stacksForReg[5] = stacksForReg[2] + 1; // next stack in previous supermodule
403 stacksForReg[6] = stack - 1; // previous stack in same supermodule
404 stacksForReg[7] = stacksForReg[1] - 1; // previous stack in next supermodule
405 stacksForReg[8] = stacksForReg[2] - 1; // previous stack in previous supermodule
406 break;
407 case 4:
408 stacksForReg[3] = stack - 1; // previous stack in same supermodule
409 stacksForReg[4] = stacksForReg[1] - 1; // previous stack in next supermodule
410 stacksForReg[5] = stacksForReg[2] - 1; // previous stack in previous supermodule
411 break;
412 default:
413 break;
414 }
415
416#ifdef TRD_TM_DEBUG
417 printf("#TRACKMATCHING - assigned ESD track %d to following TRD stacks:", iEsdTrack);
418#endif
419
420 // register for stacks
421 for (UShort_t iReg = 0; iReg < 9; ++iReg){
422 if (stacksForReg[iReg] < 0)
423 break;
424
425 if (stacksForReg[iReg] >= 90){
633f3ec4 426 AliError(Form("invalid stack for registration: %i", stacksForReg[iReg]));
30bd9a5a 427 continue;
428 }
429
430 if (esdTrackNumByStack[stacksForReg[iReg]] < fgkMaxEsdTracksPerStack - 1)
431 esdTracksByStack[stacksForReg[iReg]][esdTrackNumByStack[stacksForReg[iReg]]++] = iEsdTrack;
432#ifdef TRD_TM_DEBUG
433 else
434 printf("#TRACKMATCHING - maximum number (%d) of ESD tracks per stack reached for S%02d-%d (%d tracks total). Skipping track!\n",
435 fgkMaxEsdTracksPerStack, TrdLsiSec(stacksForReg[iReg]), TrdLsiSi(stacksForReg[iReg]), numEsdTracks);
436 printf(" S%02d-%d", TrdLsiSec(stacksForReg[iReg]), TrdLsiSi(stacksForReg[iReg]));
437#endif
438 }
439#ifdef TRD_TM_DEBUG
440 printf(" (ESD-ASSIGN)\n");
441#endif
442
443// if (esdTrackNumByStack[stack] >= fgkMaxEsdTracksPerStack){
444//#ifdef TRD_TM_DEBUG
445// printf("#TRACKMATCHING - maximum number (%d) of ESD tracks per stack reached for S%02d-%d (%d tracks total). Skipping track!\n",
446// fgkMaxEsdTracksPerStack, TrdLsiSec(stack), TrdLsiSi(stack), numEsdTracks);
447//#endif
448// continue;
449// }
450//
451// esdTracksByStack[stack][esdTrackNumByStack[stack]++] = iEsdTrack;
452//#ifdef TRD_TM_DEBUG
453// printf("#TRACKMATCHING - assigned ESD track %d to TRD stack S%02d-%d\n",
454// iEsdTrack, TrdLsiSec(stack), TrdLsiSi(stack));
455//#endif
456 }
457
458 } // loop over esd tracks
459
460#ifdef TRD_TM_DEBUG
461 printf("#TRACKMATCHING - %d ESD tracks accepted, %d rejected\n",
462 numEsdTracksAccepted, numEsdTracks - numEsdTracksAccepted);
463#endif
464
465 //
466 // search matching ESD track for each TRD online track
467 //
468 AliESDTrdTrack* trdTrack;
469 Double_t trdPt;
470 AliESDtrack* matchCandidate;
471 AliESDtrack* matchTrack;
472 Int_t matchEsdTrackIndexInStack;
473 Double_t matchRating;
474 Int_t matchCandidateCount;
475 Double_t distY, distZ;
476
477 for (UInt_t iTrdTrack = 0; iTrdTrack < numTrdTracks; ++iTrdTrack){
478
479 trdTrack = esdEvent->GetTrdTrack(iTrdTrack);
34d48b8f 480 if ((label != -1) &&
481 (trdTrack->GetLabel() != label))
482 continue;
483
30bd9a5a 484 stack = TrdSecSiLsi(trdTrack->GetSector(), trdTrack->GetStack());
485 trdPt = (esdEvent->GetMagneticField() > 0.) ? (-1.*trdTrack->Pt()) : trdTrack->Pt();
486 matchTrack = NULL;
487 matchEsdTrackIndexInStack = -1;
488 matchRating = 0.;
489 matchCandidateCount = 0;
490
491#ifdef TRD_TM_DEBUG
492 printf("#TRACKMATCHING - trying to match TRD online track %d in S%02d-%d\n",
493 iTrdTrack, trdTrack->GetSector(), trdTrack->GetStack());
494#endif
495
496 // loop over all esd tracks in the same stack and check distance
497 for (UInt_t iEsdTrack = 0; iEsdTrack < esdTrackNumByStack[stack]; ++iEsdTrack){
498 matchCandidate = esdEvent->GetTrack(esdTracksByStack[stack][iEsdTrack]);
499
500 if (EstimateTrackDistance(matchCandidate, trdTrack, esdEvent->GetMagneticField(), &distY, &distZ) == 0){
501 Double_t rating = RateTrackMatch(distY, distZ, matchCandidate->GetSignedPt(), trdPt);
502#ifdef TRD_TM_DEBUG
503 printf("#TRACKMATCHING S%02d-%d trd %d - esd %d dy: %.3f dz: %.3f r: %.3f pt e: %.2f t: %.2f match: %d\n",
504 trdTrack->GetSector(), trdTrack->GetStack(), iTrdTrack, iEsdTrack,
505 distY, distZ, rating, matchCandidate->GetSignedPt(), trdPt,
506 (rating >= fMinMatchRating) ? 1 : 0);
507#endif
508 if (rating > 0.){
509 // possibly matching pair found
510 matchCandidateCount++;
511 if ((matchTrack == NULL) || (rating > matchRating)){
512 // new best match
513 matchTrack = matchCandidate;
514 matchEsdTrackIndexInStack = iEsdTrack;
515 matchRating = rating;
516 }
517 }
518
519 } else {
520 // estimation of distance failed
521#ifdef TRD_TM_DEBUG
522 printf("TRACKMATCHING S%02d-%d trd %d - esd %d failed\n",
523 trdTrack->GetSector(), trdTrack->GetStack(), iTrdTrack, iEsdTrack);
524#endif
525 }
526 } // loop over esd tracks in same stack
527
528 if (fHistMatchRating){
529 fHistMatchRating->Fill(matchRating);
530 }
531
532 if ((matchTrack) && (matchRating >= fMinMatchRating)){
533#ifdef TRD_TM_DEBUG
534 printf("#TRACKMATCHING S%02d-%d trd %d - esd %d match! pt: %.2f %.2f\n",
535 trdTrack->GetSector(), trdTrack->GetStack(), iTrdTrack, matchEsdTrackIndexInStack,
536 trdPt, matchTrack->GetSignedPt());
537#endif
34d48b8f 538 if (updateRef)
539 trdTrack->SetTrackMatchReference(matchTrack);
540 } else {
541 if (updateRef)
542 trdTrack->SetTrackMatchReference(NULL);
543 }
30bd9a5a 544
545 } // loop over TRD online tracks
546
547 return kTRUE;
548}
549
550Bool_t AliTRDonlineTrackMatching::TrackPlaneIntersect(AliExternalTrackParam *trk, Double_t pnt[3], Double_t norm[3], Double_t mag){
551
552 // calculates the intersection point of a track param and a plane defined by point pnt and normal vector norm
553
554 UInt_t its = 0;
555 Double_t r = 290.;
556 Double_t step = 10.;
557 Int_t flag = 0;
558 Double_t dist = 0, dist_prev = 0;
559 Double_t x[3] = {0., 0., 0.};
560
561 dist = (x[0] - pnt[0]) * norm[0] + (x[1] - pnt[1]) *norm[1] + (x[2] - pnt[2]) * norm[2];
562
563 while(TMath::Abs(dist) > 0.1) {
564
565 trk->GetXYZAt(r, mag, x);
566
567 if ((x[0] * x[0] + x[1] * x[1]) < 100.) // extrapolation to radius failed
568 return kFALSE;
569
570 //distance between current track position and plane
571 dist_prev = TMath::Abs(dist);
572 dist = (x[0] - pnt[0]) * norm[0] + (x[1] - pnt[1]) * norm[1];
573 if ((flag) && (TMath::Abs(dist) > dist_prev)){
574 step /= -2.;
575 }
576 flag=1;
577 r += step;
578 its++;
579 if ((r > 380.) || (r < 100.) || (its > 100) || (TMath::Abs(step) < 0.00001)){
580 break;
581 }
582 }
583 for (Int_t i=0; i<3; i++)
584 pnt[i] = x[i];
585
586 return kTRUE;
587}
588
589Int_t AliTRDonlineTrackMatching::EstimateTrackDistance(AliESDtrack *esd_track, AliESDTrdTrack* gtu_track, Double_t mag, Double_t *ydist, Double_t *zdist){
590
591 // returns an estimate for the spatial distance between TPC offline track and GTU online track
592
593 if ((!esd_track) || (!gtu_track))
594 return -3;
595
596 // AssertTRDGeometry();
597 if (!fTRDgeo)
598 fTRDgeo = new AliTRDgeometry();
599
600 Float_t diff_y = 0;
601 Float_t diff_z = 0;
602 Int_t nLayers = 0;
603 Double_t xtrkl[3];
604 Double_t ptrkl[3];
605 Double_t ptrkl2[3];
606 UInt_t trklDet;
607 UShort_t trklLayer;
608 UInt_t stack_gtu;
609 UShort_t stackInSector;
610
611 for (UShort_t iLayer = 0; iLayer < 6; iLayer++){
612 AliESDTrdTracklet* trkl = gtu_track->GetTracklet(iLayer);
613 if (trkl){
614 trklDet = trkl->GetDetector();
615 trklLayer = TrdDetLyr(trklDet);
616 stack_gtu = TrdDetLsi(trklDet);
617 stackInSector = TrdDetSi(trklDet);
618
619 // local coordinates of the outer end point of the tracklet
620 xtrkl[0] = AliTRDgeometry::AnodePos();
621 xtrkl[1] = trkl->GetLocalY();
622
623 if(stackInSector == 2){ // corrected version by Felix Muecke
624 xtrkl[2] = fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(trkl->GetBinZ()) -
625 (fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowSize(trkl->GetBinZ()))/2. -
626 fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(6);
627 } else {
628 xtrkl[2] = fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(trkl->GetBinZ()) -
629 (fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowSize(trkl->GetBinZ()))/2. -
630 fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(8);
631 }
632
633 // old draft version
634 // xtrkl[2] = fTRDgeo->GetPadPlane(trklLayer, (trklDet/6) % 5)->GetRowPos(trkl->GetBinZ()) -
635 // fTRDgeo->GetPadPlane(trklLayer, (trklDet/6) % 5)->GetRowSize(trkl->GetBinZ()) -
636 // fTRDgeo->GetPadPlane(trklLayer, (trklDet/6) % 5)->GetRowPos(8);
637
638 // transform to global coordinates
639 TGeoHMatrix *matrix = fTRDgeo->GetClusterMatrix(trklDet);
640 if (!matrix){
633f3ec4 641 if ((stack_gtu != 13*5+2) && (stack_gtu != 14*5+2) && (stack_gtu != 15*5+2))
aa67162b 642 AliDebug(1, Form("invalid TRD cluster matrix in EstimateTrackDistance for detector %i", trklDet));
30bd9a5a 643 return -5;
644 }
645 matrix->LocalToMaster(xtrkl, ptrkl);
646 fTRDgeo->RotateBack(gtu_track->GetSector() * 30, ptrkl, ptrkl2); // ptrkl2 now contains the global position of the outer end point of the tracklet
647
648 // calculate parameterization of plane representing the tracklets layer
649 Double_t layer_zero_local[3] = {0., 0., 0.};
650 Double_t layer_zero_global[3], layer_zero_global2[3];
651
652 matrix->LocalToMaster(layer_zero_local, layer_zero_global);
653 fTRDgeo->RotateBack(trklDet, layer_zero_global, layer_zero_global2); // layer_zero_global2 points to chamber origin in global coords
654
655 Double_t layer_ref_local[3] = {AliTRDgeometry::AnodePos(), 0., 0.};
656 Double_t layer_ref_global[3], layer_ref_global2[3];
657
658 matrix->LocalToMaster(layer_ref_local, layer_ref_global);
659 fTRDgeo->RotateBack(trklDet, layer_ref_global, layer_ref_global2); // layer_ref_global2 points to center anode pos within plane in global coords
660
661 Double_t n0[3] = {layer_ref_global2[0]-layer_zero_global2[0],
662 layer_ref_global2[1]-layer_zero_global2[1],
663 layer_ref_global2[2]-layer_zero_global2[2]};
664
665 Double_t n_len = TMath::Sqrt(n0[0]*n0[0] + n0[1]*n0[1] + n0[2]*n0[2]);
666 if (n_len == 0.){ // This should never happen
633f3ec4 667 AliError("divison by zero in estimate_track_distance!");
30bd9a5a 668 n_len = 1.;
669 }
670 Double_t n[3] = {n0[0]/n_len, n0[1]/n_len, n0[2]/n_len}; // normal vector of plane
671
c433ad04 672 const AliExternalTrackParam *trackParam = esd_track->GetOuterParam();
673 if (!trackParam) {
674 trackParam = esd_track->GetInnerParam();
675 if (!trackParam)
676 trackParam = esd_track;
677 }
678
679 AliExternalTrackParam *outerTPC = new AliExternalTrackParam(*trackParam);
30bd9a5a 680 Bool_t isects = TrackPlaneIntersect(outerTPC, layer_ref_global2, n, mag); // find intersection point between track and TRD layer
681 delete outerTPC;
682 outerTPC = NULL;
683
684 if (isects == kFALSE){ // extrapolation fails, because track never reaches the TRD radius
685 return -1;
686 }
687
688 Double_t m[2] = {ptrkl2[0] - layer_ref_global2[0], ptrkl2[1] - layer_ref_global2[1]};
689 Double_t len_m = TMath::Sqrt(m[0]*m[0] + m[1]*m[1]);
690 diff_y += len_m;
691 diff_z += TMath::Abs(ptrkl2[2] - layer_ref_global2[2]);
692 nLayers++;
693 }
694 }
695
696 if (nLayers > 0){
697 *ydist = diff_y / nLayers;
698 *zdist = diff_z / nLayers;
699 return 0;
700 }
701 else
702 return -4;
703}
704
6403ed35 705Double_t AliTRDonlineTrackMatching::PtDiffRel(Double_t refPt, Double_t gtuPt){
30bd9a5a 706
707 // return relative pt difference
708
709 if (TMath::Abs(refPt) > 0.000001){
710 return (gtuPt - refPt) / refPt;
711 } else
712 return 0.;
713}
714
715
6403ed35 716Double_t AliTRDonlineTrackMatching::RateTrackMatch(Double_t distY, Double_t distZ, Double_t rpt, Double_t gpt){
30bd9a5a 717
718 // returns a match rating derived from Y and Z distance as well as pt difference
719
720 // maximum limits for spatial distance
721 if ((distY > 5.) || (distZ > 20.))
722 return 0.;
723
724 // same pt sign required
725 if ((rpt * gpt) < 0.)
726 return 0.;
727
728 Double_t rating_distY = -0.1 * distY + 1.;
729 Double_t rating_distZ = -0.025 * distZ + 1.;
730 Double_t rating_ptDiff = 1. - TMath::Abs(PtDiffRel(rpt, gpt));
731
732 if (rating_ptDiff < 0.)
733 rating_ptDiff = 0.2;
734
735 Double_t total = rating_distY * rating_distZ * rating_ptDiff;
736
737#ifdef TRD_TM_DEBUG
738 if (total > 1.){
739 printf("<ERROR> track match rating exceeds limit of 1.0: %.3f", total);
740 }
741#endif
742
743 return total;
744}
745
746
747void AliTRDonlineTrackMatching::SetEsdTrackDefaultCuts(const char* cutIdent) {
748
749 if (strcmp(cutIdent, "strict") == 0){
750
751#ifdef TRD_TM_DEBUG
752 printf("AliTRDonlineTrackMatching -- default track cuts selected");
753#endif
754
755 fEsdTrackCutMinimal = kFALSE;
756 fEsdTrackCutPrim = kFALSE;
757
758 fEsdTrackCutMinTPCrows = 70;
759 fEsdTrackCutRequireTPCrefit = kTRUE;
760 fEsdTrackCutMinRatioRowsFindableClusters = 0.8;
761 fEsdTrackCutMaxChi2TPCclusters = 4.;
762 fEsdTrackVCutsChi2TPCconstrainedVsGlobal = 36.;
763
764 fEsdTrackCutRequireITSrefit = kFALSE;
765 fEsdTrackCutMaxChi2ITSclusters = 36.;
766
767 fEsdTrackCutMaxDCAtoVertexXY = 1000.;
768 fEsdTrackCutMaxDCAtoVertexZ = 2.;
769 fEsdTrackCutsITSlayerMask = 0x0;
770
771 fEsdTrackCutPtDCAOfs = 0.0105;
772 fEsdTrackCutPtDCACoeff = 0.0350;
773 } else if (strcmp(cutIdent, "minimal") == 0){
774
775#ifdef TRD_TM_DEBUG
776 printf("AliTRDonlineTrackMatching -- minimal track cuts selected\n");
777#endif
778
779 fEsdTrackCutMinimal = kFALSE;
780 fEsdTrackCutPrim = kFALSE;
781
782 fEsdTrackCutMinTPCrows = 70;
783 fEsdTrackCutRequireTPCrefit = kTRUE;
784 fEsdTrackCutMinRatioRowsFindableClusters = 0.;
785 fEsdTrackCutMaxChi2TPCclusters = 100.;
786 fEsdTrackVCutsChi2TPCconstrainedVsGlobal = 1000.;
787
788 fEsdTrackCutRequireITSrefit = kFALSE;
789 fEsdTrackCutMaxChi2ITSclusters = 0.;
790
791 fEsdTrackCutMaxDCAtoVertexXY = 1000.;
792 fEsdTrackCutMaxDCAtoVertexZ = 1000.;
793 fEsdTrackCutsITSlayerMask = 0x0;
794 } else
633f3ec4 795 AliErrorClass("invalid cut set");
796
30bd9a5a 797}