1 /**************************************************************************
2 * Copyright(c) 1998-2012, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
16 ///////////////////////////////////////////////////////////////////////////////
18 // Track matching between TRD online tracks and ESD tracks.
20 // Author: Felix Rettig <rettig@compeng.uni-frankfurt.de>
22 ///////////////////////////////////////////////////////////////////////////////
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"
34 const Float_t AliTRDonlineTrackMatching::fgkSaveInnerRadius = 290.5;
35 const Float_t AliTRDonlineTrackMatching::fgkSaveOuterRadius = 364.5;
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;
52 AliTRDonlineTrackMatching::AliTRDonlineTrackMatching() :
54 fMinMatchRating(0.25),
55 fHistMatchRating(NULL)
58 SetEsdTrackDefaultCuts("minimal");
61 AliTRDonlineTrackMatching::AliTRDonlineTrackMatching(const AliTRDonlineTrackMatching &c) :
63 fMinMatchRating(c.fMinMatchRating),
64 fHistMatchRating(c.fHistMatchRating)
69 AliTRDonlineTrackMatching::~AliTRDonlineTrackMatching() {
77 Short_t AliTRDonlineTrackMatching::EstimateSector(const Double_t globalCoords[3]) {
79 // estimates sector by phi angle in x-y plane
81 if ((TMath::Abs(globalCoords[0]) > 600) || (TMath::Abs(globalCoords[0]) > 600) || (TMath::Sqrt(globalCoords[0]*globalCoords[0] + globalCoords[1]*globalCoords[1]) < 0.01)){
82 //printf("GGG %.3f/%.3f\n", globalCoords[0], globalCoords[1]);
85 Double_t ang = TMath::ATan2(globalCoords[1], globalCoords[0]);
88 printf(" es: %.2f/%.2f -> phi: %.2fdeg -> Sec %02d (A)\n",
89 globalCoords[0], globalCoords[1], TMath::ATan2(globalCoords[1], globalCoords[0])*180./TMath::Pi(),
90 TMath::FloorNint(ang/(20./180.*TMath::Pi())));
92 return TMath::FloorNint(ang/(20./180.*TMath::Pi()));
95 printf(" es: %.2f/%.2f -> phi: %.2fdeg -> Sec %02d (B)\n",
96 globalCoords[0], globalCoords[1], TMath::ATan2(globalCoords[1], globalCoords[0])*180./TMath::Pi(),
97 17 - TMath::FloorNint(TMath::Abs(ang)/(20./180.*TMath::Pi())));
99 return 17 - TMath::FloorNint(TMath::Abs(ang)/(20./180.*TMath::Pi()));
105 Short_t AliTRDonlineTrackMatching::EstimateLayer(Double_t radius) {
107 // estimates layer by radial distance (for virtual stack at phi = 0)
109 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
110 const Short_t rLayers[7] = {-1, 0, 1, 2, 3, 4, 5};
111 for (UShort_t i = 0; i < 7; ++i){
112 if (radius < rBoundaries[i])
115 return -2; // radius larger than outmost layer
118 Short_t AliTRDonlineTrackMatching::EstimateLocalStack(const Double_t globalCoords[3]) {
120 // determines stack within sector by z position
122 Double_t absZ = TMath::Abs(globalCoords[2]);
123 Short_t signZ = (globalCoords[2] > 0.) ? 1 : -1;
124 Double_t r = TMath::Sqrt(globalCoords[0]*globalCoords[0] + globalCoords[1]*globalCoords[1]);
125 Short_t layer = EstimateLayer(r);
128 printf("EstimateLocalStack A r: %.2f x: %.2f/%.2f/%.2f -> layer: %i absZ = %.2f\n",
129 r, globalCoords[0], globalCoords[1], globalCoords[2], layer, absZ);
135 Double_t innerStackHalfLength = AliTRDgeometry::GetChamberLength(0, 2) / 2.; // same for all layers
136 if (absZ < innerStackHalfLength)
139 Double_t outerStackLength = AliTRDgeometry::GetChamberLength(layer, 1);
141 absZ -= innerStackHalfLength;
144 printf("EstimateLocalStack B r: %.2f x: %.2f/%.2f/%.2f -> layer: %i absZ = %.2f il: %.2f ol: %.2f\n",
145 r, globalCoords[0], globalCoords[1], globalCoords[2], layer, absZ, 2.*innerStackHalfLength, outerStackLength);
148 if (absZ > 2.05*outerStackLength)
149 return (signZ > 0) ? -2 : -1; // outside supermodule in z direction
151 if (absZ < outerStackLength)
152 return (signZ > 0) ? 1 : 3;
154 return (signZ > 0) ? 0 : 4;
158 Short_t AliTRDonlineTrackMatching::EstimateStack(const Double_t globalCoords[3]) {
160 // returns the closest TRD stack to a 3D position in global coordinates
162 Short_t sec = EstimateSector(globalCoords);
163 Short_t st = EstimateLocalStack(globalCoords);
165 printf("EstimateStack sec %d st %d\n", sec, st);
167 if ((sec < 0) || (st < 0))
173 Bool_t AliTRDonlineTrackMatching::StackToTrack(const AliExternalTrackParam *track, Short_t &stack, UShort_t &layersWithTracklet, Double_t magFieldinKiloGauss){
175 // returns stack to track param
178 layersWithTracklet = 0;
180 UInt_t stackHits[fgkTrdStacks];
182 memset(stackHits, 0, fgkTrdStacks*sizeof(UInt_t));
185 printf("STACK-TO-TRACK\n");
188 Double_t r = fgkSaveInnerRadius;
189 while (r < fgkSaveOuterRadius){
190 track->GetXYZAt(r, magFieldinKiloGauss, x);
191 stack = EstimateStack(x);
194 if (stackHits[stack] > 16) // experimental
197 printf(" r=%.3fcm %.2f/%.2f - %d hits for stack %d S%02d-%d (mag=%.1f)\n",
198 r, x[0], x[1], stackHits[stack], stack, stack/5, stack%5, magFieldinKiloGauss);
204 // find stack with most hits
206 for (UShort_t iStack = 0; iStack < fgkTrdStacks; ++iStack){
207 if (stackHits[iStack] == 0)
210 printf(" finally %d hits in stack S%02d-%d\n", stackHits[iStack], iStack/5, iStack%5);
212 if (stackHits[iStack] > bestHits){
213 bestHits = stackHits[iStack];
220 printf("best stack: S%02d-%d\n", TrdLsiSec(stack), TrdLsiSi(stack));
228 Bool_t AliTRDonlineTrackMatching::StackToTrack(const AliESDtrack* track, Short_t &stack, UShort_t &layersWithTracklet, Double_t magFieldinKiloGauss){
230 // returns stack to ESD track
232 if (track->GetOuterParam())
233 return StackToTrack(track->GetOuterParam(), stack, layersWithTracklet, magFieldinKiloGauss);
234 else if (track->GetInnerParam())
235 return StackToTrack(track->GetInnerParam(), stack, layersWithTracklet, magFieldinKiloGauss);
237 return StackToTrack(track, stack, layersWithTracklet, magFieldinKiloGauss);
240 Bool_t AliTRDonlineTrackMatching::AcceptTrack(const AliESDtrack* esdTrack, const AliESDEvent* esdEvent){
242 // returns result ESD track cuts
247 UInt_t status = esdTrack->GetStatus();
249 if (fEsdTrackCutMinimal){
250 return ((status & AliESDtrack::kTPCout) > 0);
254 if ((fEsdTrackCutRequireTPCrefit) && (!(status & AliESDtrack::kTPCrefit)))
257 // require ITS re-fit
258 if ((fEsdTrackCutRequireITSrefit) && (!(status & AliESDtrack::kITSrefit)))
262 Float_t nCrossedRowsTPC = esdTrack->GetTPCCrossedRows();
263 Float_t ratioCrossedRowsOverFindableClustersTPC =
264 (esdTrack->GetTPCNclsF() > 0) ? (nCrossedRowsTPC / esdTrack->GetTPCNclsF()) : 1.0;
265 Float_t chi2PerClusterTPC =
266 (esdTrack->GetTPCclusters(0) > 0) ? (esdTrack->GetTPCchi2()/Float_t(esdTrack->GetTPCclusters(0))) : 100.;
269 (nCrossedRowsTPC < fEsdTrackCutMinTPCrows) ||
270 (ratioCrossedRowsOverFindableClustersTPC < fEsdTrackCutMinRatioRowsFindableClusters) ||
271 (chi2PerClusterTPC > fEsdTrackCutMaxChi2TPCclusters)
276 Float_t chi2PerClusterITS = (esdTrack->GetITSclusters(0) > 0) ? esdTrack->GetITSchi2()/Float_t(esdTrack->GetITSclusters(0)) : 1000.;
277 UShort_t clustersInAnyITSlayer = kFALSE;
278 for (UShort_t layer = 0; layer < 6; ++layer)
279 clustersInAnyITSlayer += (esdTrack->HasPointOnITSLayer(layer) & ((fEsdTrackCutsITSlayerMask >> layer) & 1));
281 if ((fEsdTrackCutsITSlayerMask != 0) &&
282 ((clustersInAnyITSlayer == 0) || (chi2PerClusterITS >= fEsdTrackCutMaxChi2ITSclusters))
286 // geometric requirements
287 Float_t impactPos[2], impactCov[3];
288 esdTrack->GetImpactParameters(impactPos, impactCov);
290 if (TMath::Abs(impactPos[0]) > fEsdTrackCutMaxDCAtoVertexXY)
293 if (TMath::Abs(impactPos[1]) > fEsdTrackCutMaxDCAtoVertexZ)
296 if (fEsdTrackCutPrim){
297 // additional requirements for primary tracks
299 const AliESDVertex* vertex = esdEvent->GetPrimaryVertexTracks();
300 if ((!vertex) || (!vertex->GetStatus()))
301 vertex = esdEvent->GetPrimaryVertexSPD();
303 Float_t chi2TPCConstrainedVsGlobal =
304 (vertex->GetStatus()) ? esdTrack->GetChi2TPCConstrainedVsGlobal(vertex) : (fEsdTrackVCutsChi2TPCconstrainedVsGlobal + 10.);
306 if (chi2TPCConstrainedVsGlobal > fEsdTrackVCutsChi2TPCconstrainedVsGlobal)
309 Float_t cutDCAToVertexXYPtDep =
310 fEsdTrackCutPtDCAOfs + fEsdTrackCutPtDCACoeff/((TMath::Abs(esdTrack->Pt()) > 0.0001) ? esdTrack->Pt() : 0.0001);
312 if (TMath::Abs(impactPos[0]) >= cutDCAToVertexXYPtDep)
320 Bool_t AliTRDonlineTrackMatching::ProcessEvent(AliESDEvent *esdEvent) {
322 // performs track matching for all TRD online tracks of the ESD event
324 UInt_t numTrdTracks = esdEvent->GetNumberOfTrdTracks();
325 if (numTrdTracks <= 0)
328 if (!AliGeomManager::GetGeometry()){
329 printf("Geometry not available! Aborting TRD track matching.\n");
334 fTRDgeo = new AliTRDgeometry();
338 // ESD track selection and sorting by TRD stack
341 UInt_t esdTracksByStack[fgkTrdStacks][fgkMaxEsdTracksPerStack];
342 UInt_t esdTrackNumByStack[fgkTrdStacks];
343 memset(esdTrackNumByStack, 0, fgkTrdStacks*sizeof(UInt_t));
345 UInt_t numEsdTracks = esdEvent->GetNumberOfTracks();
347 UInt_t numEsdTracksAccepted = 0;
351 AliESDtrack* esdTrack;
353 for (UInt_t iEsdTrack = 0; iEsdTrack < numEsdTracks; ++iEsdTrack){
354 esdTrack = esdEvent->GetTrack(iEsdTrack);
357 printf("#TRACKMATCHING - invalid ESD track!\n");
362 if (!AcceptTrack(esdTrack, esdEvent))
366 numEsdTracksAccepted++;
369 // assign ESD track to TRD stack
370 if (StackToTrack(esdTrack, stack, layers, esdEvent->GetMagneticField())){
374 printf("#TRACKMATCHING - invalid stack for ESD track\n");
379 // register track in relevant stacks
380 Int_t stacksForReg[9] = {-1, -1, -1, -1, -1, -1, -1, -1, -1};
381 stacksForReg[0] = stack; // stack hit
382 stacksForReg[1] = (stack + 5) % 90; // same stack in next supermodule
383 stacksForReg[2] = (stack - 5); // same stack in previous supermodule
384 if (stacksForReg[2] < 0)
385 stacksForReg[2] += 90;
387 switch(TrdLsiSi(stack)){
390 stacksForReg[3] = stack + 1; // next stack in same supermodule
391 stacksForReg[4] = stacksForReg[1] + 1; // next stack in next supermodule
392 stacksForReg[5] = stacksForReg[2] + 1; // next stack in previous supermodule
397 stacksForReg[3] = stack + 1; // next stack in same supermodule
398 stacksForReg[4] = stacksForReg[1] + 1; // next stack in next supermodule
399 stacksForReg[5] = stacksForReg[2] + 1; // next stack in previous supermodule
400 stacksForReg[6] = stack - 1; // previous stack in same supermodule
401 stacksForReg[7] = stacksForReg[1] - 1; // previous stack in next supermodule
402 stacksForReg[8] = stacksForReg[2] - 1; // previous stack in previous supermodule
405 stacksForReg[3] = stack - 1; // previous stack in same supermodule
406 stacksForReg[4] = stacksForReg[1] - 1; // previous stack in next supermodule
407 stacksForReg[5] = stacksForReg[2] - 1; // previous stack in previous supermodule
414 printf("#TRACKMATCHING - assigned ESD track %d to following TRD stacks:", iEsdTrack);
417 // register for stacks
418 for (UShort_t iReg = 0; iReg < 9; ++iReg){
419 if (stacksForReg[iReg] < 0)
422 if (stacksForReg[iReg] >= 90){
423 printf("#TRACKMATCHING - invalid stack for registration: %i\n", stacksForReg[iReg]);
427 if (esdTrackNumByStack[stacksForReg[iReg]] < fgkMaxEsdTracksPerStack - 1)
428 esdTracksByStack[stacksForReg[iReg]][esdTrackNumByStack[stacksForReg[iReg]]++] = iEsdTrack;
431 printf("#TRACKMATCHING - maximum number (%d) of ESD tracks per stack reached for S%02d-%d (%d tracks total). Skipping track!\n",
432 fgkMaxEsdTracksPerStack, TrdLsiSec(stacksForReg[iReg]), TrdLsiSi(stacksForReg[iReg]), numEsdTracks);
433 printf(" S%02d-%d", TrdLsiSec(stacksForReg[iReg]), TrdLsiSi(stacksForReg[iReg]));
437 printf(" (ESD-ASSIGN)\n");
440 // if (esdTrackNumByStack[stack] >= fgkMaxEsdTracksPerStack){
441 //#ifdef TRD_TM_DEBUG
442 // printf("#TRACKMATCHING - maximum number (%d) of ESD tracks per stack reached for S%02d-%d (%d tracks total). Skipping track!\n",
443 // fgkMaxEsdTracksPerStack, TrdLsiSec(stack), TrdLsiSi(stack), numEsdTracks);
448 // esdTracksByStack[stack][esdTrackNumByStack[stack]++] = iEsdTrack;
449 //#ifdef TRD_TM_DEBUG
450 // printf("#TRACKMATCHING - assigned ESD track %d to TRD stack S%02d-%d\n",
451 // iEsdTrack, TrdLsiSec(stack), TrdLsiSi(stack));
455 } // loop over esd tracks
458 printf("#TRACKMATCHING - %d ESD tracks accepted, %d rejected\n",
459 numEsdTracksAccepted, numEsdTracks - numEsdTracksAccepted);
463 // search matching ESD track for each TRD online track
465 AliESDTrdTrack* trdTrack;
467 AliESDtrack* matchCandidate;
468 AliESDtrack* matchTrack;
469 Int_t matchEsdTrackIndexInStack;
470 Double_t matchRating;
471 Int_t matchCandidateCount;
472 Double_t distY, distZ;
474 for (UInt_t iTrdTrack = 0; iTrdTrack < numTrdTracks; ++iTrdTrack){
476 trdTrack = esdEvent->GetTrdTrack(iTrdTrack);
477 stack = TrdSecSiLsi(trdTrack->GetSector(), trdTrack->GetStack());
478 trdPt = (esdEvent->GetMagneticField() > 0.) ? (-1.*trdTrack->Pt()) : trdTrack->Pt();
480 matchEsdTrackIndexInStack = -1;
482 matchCandidateCount = 0;
485 printf("#TRACKMATCHING - trying to match TRD online track %d in S%02d-%d\n",
486 iTrdTrack, trdTrack->GetSector(), trdTrack->GetStack());
489 // loop over all esd tracks in the same stack and check distance
490 for (UInt_t iEsdTrack = 0; iEsdTrack < esdTrackNumByStack[stack]; ++iEsdTrack){
491 matchCandidate = esdEvent->GetTrack(esdTracksByStack[stack][iEsdTrack]);
493 if (EstimateTrackDistance(matchCandidate, trdTrack, esdEvent->GetMagneticField(), &distY, &distZ) == 0){
494 Double_t rating = RateTrackMatch(distY, distZ, matchCandidate->GetSignedPt(), trdPt);
496 printf("#TRACKMATCHING S%02d-%d trd %d - esd %d dy: %.3f dz: %.3f r: %.3f pt e: %.2f t: %.2f match: %d\n",
497 trdTrack->GetSector(), trdTrack->GetStack(), iTrdTrack, iEsdTrack,
498 distY, distZ, rating, matchCandidate->GetSignedPt(), trdPt,
499 (rating >= fMinMatchRating) ? 1 : 0);
502 // possibly matching pair found
503 matchCandidateCount++;
504 if ((matchTrack == NULL) || (rating > matchRating)){
506 matchTrack = matchCandidate;
507 matchEsdTrackIndexInStack = iEsdTrack;
508 matchRating = rating;
513 // estimation of distance failed
515 printf("TRACKMATCHING S%02d-%d trd %d - esd %d failed\n",
516 trdTrack->GetSector(), trdTrack->GetStack(), iTrdTrack, iEsdTrack);
519 } // loop over esd tracks in same stack
521 if (fHistMatchRating){
522 fHistMatchRating->Fill(matchRating);
525 if ((matchTrack) && (matchRating >= fMinMatchRating)){
527 printf("#TRACKMATCHING S%02d-%d trd %d - esd %d match! pt: %.2f %.2f\n",
528 trdTrack->GetSector(), trdTrack->GetStack(), iTrdTrack, matchEsdTrackIndexInStack,
529 trdPt, matchTrack->GetSignedPt());
531 trdTrack->SetTrackMatchReference(matchTrack);
533 trdTrack->SetTrackMatchReference(NULL);
535 } // loop over TRD online tracks
540 Bool_t AliTRDonlineTrackMatching::TrackPlaneIntersect(AliExternalTrackParam *trk, Double_t pnt[3], Double_t norm[3], Double_t mag){
542 // calculates the intersection point of a track param and a plane defined by point pnt and normal vector norm
548 Double_t dist = 0, dist_prev = 0;
549 Double_t x[3] = {0., 0., 0.};
551 dist = (x[0] - pnt[0]) * norm[0] + (x[1] - pnt[1]) *norm[1] + (x[2] - pnt[2]) * norm[2];
553 while(TMath::Abs(dist) > 0.1) {
555 trk->GetXYZAt(r, mag, x);
557 if ((x[0] * x[0] + x[1] * x[1]) < 100.) // extrapolation to radius failed
560 //distance between current track position and plane
561 dist_prev = TMath::Abs(dist);
562 dist = (x[0] - pnt[0]) * norm[0] + (x[1] - pnt[1]) * norm[1];
563 if ((flag) && (TMath::Abs(dist) > dist_prev)){
569 if ((r > 380.) || (r < 100.) || (its > 100) || (TMath::Abs(step) < 0.00001)){
573 for (Int_t i=0; i<3; i++)
579 Int_t AliTRDonlineTrackMatching::EstimateTrackDistance(AliESDtrack *esd_track, AliESDTrdTrack* gtu_track, Double_t mag, Double_t *ydist, Double_t *zdist){
581 // returns an estimate for the spatial distance between TPC offline track and GTU online track
583 if ((!esd_track) || (!gtu_track))
586 // AssertTRDGeometry();
588 fTRDgeo = new AliTRDgeometry();
599 UShort_t stackInSector;
601 for (UShort_t iLayer = 0; iLayer < 6; iLayer++){
602 AliESDTrdTracklet* trkl = gtu_track->GetTracklet(iLayer);
604 trklDet = trkl->GetDetector();
605 trklLayer = TrdDetLyr(trklDet);
606 stack_gtu = TrdDetLsi(trklDet);
607 stackInSector = TrdDetSi(trklDet);
609 // local coordinates of the outer end point of the tracklet
610 xtrkl[0] = AliTRDgeometry::AnodePos();
611 xtrkl[1] = trkl->GetLocalY();
613 if(stackInSector == 2){ // corrected version by Felix Muecke
614 xtrkl[2] = fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(trkl->GetBinZ()) -
615 (fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowSize(trkl->GetBinZ()))/2. -
616 fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(6);
618 xtrkl[2] = fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(trkl->GetBinZ()) -
619 (fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowSize(trkl->GetBinZ()))/2. -
620 fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(8);
624 // xtrkl[2] = fTRDgeo->GetPadPlane(trklLayer, (trklDet/6) % 5)->GetRowPos(trkl->GetBinZ()) -
625 // fTRDgeo->GetPadPlane(trklLayer, (trklDet/6) % 5)->GetRowSize(trkl->GetBinZ()) -
626 // fTRDgeo->GetPadPlane(trklLayer, (trklDet/6) % 5)->GetRowPos(8);
628 // transform to global coordinates
629 TGeoHMatrix *matrix = fTRDgeo->GetClusterMatrix(trklDet);
631 printf("ERROR - invalid TRD cluster matrix in EstimateTrackDistance for detector %i", trklDet);
634 matrix->LocalToMaster(xtrkl, ptrkl);
635 fTRDgeo->RotateBack(gtu_track->GetSector() * 30, ptrkl, ptrkl2); // ptrkl2 now contains the global position of the outer end point of the tracklet
637 // calculate parameterization of plane representing the tracklets layer
638 Double_t layer_zero_local[3] = {0., 0., 0.};
639 Double_t layer_zero_global[3], layer_zero_global2[3];
641 matrix->LocalToMaster(layer_zero_local, layer_zero_global);
642 fTRDgeo->RotateBack(trklDet, layer_zero_global, layer_zero_global2); // layer_zero_global2 points to chamber origin in global coords
644 Double_t layer_ref_local[3] = {AliTRDgeometry::AnodePos(), 0., 0.};
645 Double_t layer_ref_global[3], layer_ref_global2[3];
647 matrix->LocalToMaster(layer_ref_local, layer_ref_global);
648 fTRDgeo->RotateBack(trklDet, layer_ref_global, layer_ref_global2); // layer_ref_global2 points to center anode pos within plane in global coords
650 Double_t n0[3] = {layer_ref_global2[0]-layer_zero_global2[0],
651 layer_ref_global2[1]-layer_zero_global2[1],
652 layer_ref_global2[2]-layer_zero_global2[2]};
654 Double_t n_len = TMath::Sqrt(n0[0]*n0[0] + n0[1]*n0[1] + n0[2]*n0[2]);
655 if (n_len == 0.){ // This should never happen
656 printf("<ERROR> divison by zero in estimate_track_distance!");
659 Double_t n[3] = {n0[0]/n_len, n0[1]/n_len, n0[2]/n_len}; // normal vector of plane
661 AliExternalTrackParam *outerTPC = new AliExternalTrackParam(*(esd_track->GetOuterParam()));
662 Bool_t isects = TrackPlaneIntersect(outerTPC, layer_ref_global2, n, mag); // find intersection point between track and TRD layer
666 if (isects == kFALSE){ // extrapolation fails, because track never reaches the TRD radius
670 Double_t m[2] = {ptrkl2[0] - layer_ref_global2[0], ptrkl2[1] - layer_ref_global2[1]};
671 Double_t len_m = TMath::Sqrt(m[0]*m[0] + m[1]*m[1]);
673 diff_z += TMath::Abs(ptrkl2[2] - layer_ref_global2[2]);
679 *ydist = diff_y / nLayers;
680 *zdist = diff_z / nLayers;
687 Double_t AliTRDonlineTrackMatching::PtDiffRel(Double_t refPt, Double_t gtuPt){
689 // return relative pt difference
691 if (TMath::Abs(refPt) > 0.000001){
692 return (gtuPt - refPt) / refPt;
698 Double_t AliTRDonlineTrackMatching::RateTrackMatch(Double_t distY, Double_t distZ, Double_t rpt, Double_t gpt){
700 // returns a match rating derived from Y and Z distance as well as pt difference
702 // maximum limits for spatial distance
703 if ((distY > 5.) || (distZ > 20.))
706 // same pt sign required
707 if ((rpt * gpt) < 0.)
710 Double_t rating_distY = -0.1 * distY + 1.;
711 Double_t rating_distZ = -0.025 * distZ + 1.;
712 Double_t rating_ptDiff = 1. - TMath::Abs(PtDiffRel(rpt, gpt));
714 if (rating_ptDiff < 0.)
717 Double_t total = rating_distY * rating_distZ * rating_ptDiff;
721 printf("<ERROR> track match rating exceeds limit of 1.0: %.3f", total);
729 void AliTRDonlineTrackMatching::SetEsdTrackDefaultCuts(const char* cutIdent) {
731 if (strcmp(cutIdent, "strict") == 0){
734 printf("AliTRDonlineTrackMatching -- default track cuts selected");
737 fEsdTrackCutMinimal = kFALSE;
738 fEsdTrackCutPrim = kFALSE;
740 fEsdTrackCutMinTPCrows = 70;
741 fEsdTrackCutRequireTPCrefit = kTRUE;
742 fEsdTrackCutMinRatioRowsFindableClusters = 0.8;
743 fEsdTrackCutMaxChi2TPCclusters = 4.;
744 fEsdTrackVCutsChi2TPCconstrainedVsGlobal = 36.;
746 fEsdTrackCutRequireITSrefit = kFALSE;
747 fEsdTrackCutMaxChi2ITSclusters = 36.;
749 fEsdTrackCutMaxDCAtoVertexXY = 1000.;
750 fEsdTrackCutMaxDCAtoVertexZ = 2.;
751 fEsdTrackCutsITSlayerMask = 0x0;
753 fEsdTrackCutPtDCAOfs = 0.0105;
754 fEsdTrackCutPtDCACoeff = 0.0350;
755 } else if (strcmp(cutIdent, "minimal") == 0){
758 printf("AliTRDonlineTrackMatching -- minimal track cuts selected\n");
761 fEsdTrackCutMinimal = kFALSE;
762 fEsdTrackCutPrim = kFALSE;
764 fEsdTrackCutMinTPCrows = 70;
765 fEsdTrackCutRequireTPCrefit = kTRUE;
766 fEsdTrackCutMinRatioRowsFindableClusters = 0.;
767 fEsdTrackCutMaxChi2TPCclusters = 100.;
768 fEsdTrackVCutsChi2TPCconstrainedVsGlobal = 1000.;
770 fEsdTrackCutRequireITSrefit = kFALSE;
771 fEsdTrackCutMaxChi2ITSclusters = 0.;
773 fEsdTrackCutMaxDCAtoVertexXY = 1000.;
774 fEsdTrackCutMaxDCAtoVertexZ = 1000.;
775 fEsdTrackCutsITSlayerMask = 0x0;
777 printf("ERROR: invalid cut set");