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() :
55 fMinMatchRating(0.25),
56 fHistMatchRating(NULL)
59 SetEsdTrackDefaultCuts("minimal");
62 AliTRDonlineTrackMatching::AliTRDonlineTrackMatching(const AliTRDonlineTrackMatching &c) :
65 fMinMatchRating(c.fMinMatchRating),
66 fHistMatchRating(c.fHistMatchRating)
71 AliTRDonlineTrackMatching::~AliTRDonlineTrackMatching() {
79 Short_t AliTRDonlineTrackMatching::EstimateSector(const Double_t globalCoords[3]) {
81 // estimates sector by phi angle in x-y plane
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]);
87 Double_t ang = TMath::ATan2(globalCoords[1], globalCoords[0]);
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())));
94 return TMath::FloorNint(ang/(20./180.*TMath::Pi()));
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())));
101 return 17 - TMath::FloorNint(TMath::Abs(ang)/(20./180.*TMath::Pi()));
107 Short_t AliTRDonlineTrackMatching::EstimateLayer(Double_t radius) {
109 // estimates layer by radial distance (for virtual stack at phi = 0)
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])
117 return -2; // radius larger than outmost layer
120 Short_t AliTRDonlineTrackMatching::EstimateLocalStack(const Double_t globalCoords[3]) {
122 // determines stack within sector by z position
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);
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);
137 Double_t innerStackHalfLength = AliTRDgeometry::GetChamberLength(0, 2) / 2.; // same for all layers
138 if (absZ < innerStackHalfLength)
141 Double_t outerStackLength = AliTRDgeometry::GetChamberLength(layer, 1);
143 absZ -= innerStackHalfLength;
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);
150 if (absZ > 2.05*outerStackLength)
151 return (signZ > 0) ? -2 : -1; // outside supermodule in z direction
153 if (absZ < outerStackLength)
154 return (signZ > 0) ? 1 : 3;
156 return (signZ > 0) ? 0 : 4;
160 Short_t AliTRDonlineTrackMatching::EstimateStack(const Double_t globalCoords[3]) {
162 // returns the closest TRD stack to a 3D position in global coordinates
164 Short_t sec = EstimateSector(globalCoords);
165 Short_t st = EstimateLocalStack(globalCoords);
167 printf("EstimateStack sec %d st %d\n", sec, st);
169 if ((sec < 0) || (st < 0))
175 Bool_t AliTRDonlineTrackMatching::StackToTrack(const AliExternalTrackParam *track, Short_t &stack, UShort_t &layersWithTracklet, Double_t magFieldinKiloGauss){
177 // returns stack to track param
180 layersWithTracklet = 0;
182 UInt_t stackHits[fgkTrdStacks];
184 memset(stackHits, 0, fgkTrdStacks*sizeof(UInt_t));
187 printf("STACK-TO-TRACK\n");
190 Double_t r = fgkSaveInnerRadius;
191 while (r < fgkSaveOuterRadius){
192 track->GetXYZAt(r, magFieldinKiloGauss, x);
193 stack = EstimateStack(x);
196 if (stackHits[stack] > 16) // experimental
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);
206 // find stack with most hits
208 for (UShort_t iStack = 0; iStack < fgkTrdStacks; ++iStack){
209 if (stackHits[iStack] == 0)
212 printf(" finally %d hits in stack S%02d-%d\n", stackHits[iStack], iStack/5, iStack%5);
214 if (stackHits[iStack] > bestHits){
215 bestHits = stackHits[iStack];
222 printf("best stack: S%02d-%d\n", TrdLsiSec(stack), TrdLsiSi(stack));
230 Bool_t AliTRDonlineTrackMatching::StackToTrack(const AliESDtrack* track, Short_t &stack, UShort_t &layersWithTracklet, Double_t magFieldinKiloGauss){
232 // returns stack to ESD track
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);
239 return StackToTrack(track, stack, layersWithTracklet, magFieldinKiloGauss);
242 Bool_t AliTRDonlineTrackMatching::AcceptTrack(const AliESDtrack* esdTrack, const AliESDEvent* esdEvent){
244 // returns result ESD track cuts
249 UInt_t status = esdTrack->GetStatus();
251 if (fEsdTrackCutMinimal){
252 return ((status & AliESDtrack::kTPCout) > 0);
256 if ((fEsdTrackCutRequireTPCrefit) && (!(status & AliESDtrack::kTPCrefit)))
259 // require ITS re-fit
260 if ((fEsdTrackCutRequireITSrefit) && (!(status & AliESDtrack::kITSrefit)))
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.;
271 (nCrossedRowsTPC < fEsdTrackCutMinTPCrows) ||
272 (ratioCrossedRowsOverFindableClustersTPC < fEsdTrackCutMinRatioRowsFindableClusters) ||
273 (chi2PerClusterTPC > fEsdTrackCutMaxChi2TPCclusters)
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));
283 if ((fEsdTrackCutsITSlayerMask != 0) &&
284 ((clustersInAnyITSlayer == 0) || (chi2PerClusterITS >= fEsdTrackCutMaxChi2ITSclusters))
288 // geometric requirements
289 Float_t impactPos[2], impactCov[3];
290 esdTrack->GetImpactParameters(impactPos, impactCov);
292 if (TMath::Abs(impactPos[0]) > fEsdTrackCutMaxDCAtoVertexXY)
295 if (TMath::Abs(impactPos[1]) > fEsdTrackCutMaxDCAtoVertexZ)
298 if (fEsdTrackCutPrim){
299 // additional requirements for primary tracks
301 const AliESDVertex* vertex = esdEvent->GetPrimaryVertexTracks();
302 if ((!vertex) || (!vertex->GetStatus()))
303 vertex = esdEvent->GetPrimaryVertexSPD();
305 Float_t chi2TPCConstrainedVsGlobal =
306 (vertex->GetStatus()) ? esdTrack->GetChi2TPCConstrainedVsGlobal(vertex) : (fEsdTrackVCutsChi2TPCconstrainedVsGlobal + 10.);
308 if (chi2TPCConstrainedVsGlobal > fEsdTrackVCutsChi2TPCconstrainedVsGlobal)
311 Float_t cutDCAToVertexXYPtDep =
312 fEsdTrackCutPtDCAOfs + fEsdTrackCutPtDCACoeff/((TMath::Abs(esdTrack->Pt()) > 0.0001) ? esdTrack->Pt() : 0.0001);
314 if (TMath::Abs(impactPos[0]) >= cutDCAToVertexXYPtDep)
322 Bool_t AliTRDonlineTrackMatching::ProcessEvent(AliESDEvent *esdEvent, Bool_t updateRef, Int_t label) {
324 // performs track matching for all TRD online tracks of the ESD event
326 UInt_t numTrdTracks = esdEvent->GetNumberOfTrdTracks();
327 if (numTrdTracks <= 0)
330 if (!AliGeomManager::GetGeometry()){
331 AliError("Geometry not available! Skipping TRD track matching.");
336 fTRDgeo = new AliTRDgeometry();
340 // ESD track selection and sorting by TRD stack
343 UInt_t esdTracksByStack[fgkTrdStacks][fgkMaxEsdTracksPerStack];
344 UInt_t esdTrackNumByStack[fgkTrdStacks];
345 memset(esdTrackNumByStack, 0, fgkTrdStacks*sizeof(UInt_t));
347 UInt_t numEsdTracks = esdEvent->GetNumberOfTracks();
349 UInt_t numEsdTracksAccepted = 0;
353 AliESDtrack* esdTrack;
355 for (UInt_t iEsdTrack = 0; iEsdTrack < numEsdTracks; ++iEsdTrack){
356 esdTrack = esdEvent->GetTrack(iEsdTrack);
359 AliError("invalid ESD track!");
364 if (!AcceptTrack(esdTrack, esdEvent))
368 numEsdTracksAccepted++;
371 // assign ESD track to TRD stack
372 if (StackToTrack(esdTrack, stack, layers, esdEvent->GetMagneticField())){
376 printf("#TRACKMATCHING - invalid stack for ESD track\n");
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;
389 switch(TrdLsiSi(stack)){
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
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
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
416 printf("#TRACKMATCHING - assigned ESD track %d to following TRD stacks:", iEsdTrack);
419 // register for stacks
420 for (UShort_t iReg = 0; iReg < 9; ++iReg){
421 if (stacksForReg[iReg] < 0)
424 if (stacksForReg[iReg] >= 90){
425 AliError(Form("invalid stack for registration: %i", stacksForReg[iReg]));
429 if (esdTrackNumByStack[stacksForReg[iReg]] < fgkMaxEsdTracksPerStack - 1)
430 esdTracksByStack[stacksForReg[iReg]][esdTrackNumByStack[stacksForReg[iReg]]++] = iEsdTrack;
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]));
439 printf(" (ESD-ASSIGN)\n");
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);
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));
457 } // loop over esd tracks
460 printf("#TRACKMATCHING - %d ESD tracks accepted, %d rejected\n",
461 numEsdTracksAccepted, numEsdTracks - numEsdTracksAccepted);
465 // search matching ESD track for each TRD online track
467 AliESDTrdTrack* trdTrack;
469 AliESDtrack* matchCandidate;
470 AliESDtrack* matchTrack;
471 Int_t matchEsdTrackIndexInStack;
472 Double_t matchRating;
473 Int_t matchCandidateCount;
474 Double_t distY, distZ;
476 for (UInt_t iTrdTrack = 0; iTrdTrack < numTrdTracks; ++iTrdTrack){
478 trdTrack = esdEvent->GetTrdTrack(iTrdTrack);
480 (trdTrack->GetLabel() != label))
483 stack = TrdSecSiLsi(trdTrack->GetSector(), trdTrack->GetStack());
484 trdPt = (esdEvent->GetMagneticField() > 0.) ? (-1.*trdTrack->Pt()) : trdTrack->Pt();
486 matchEsdTrackIndexInStack = -1;
488 matchCandidateCount = 0;
491 printf("#TRACKMATCHING - trying to match TRD online track %d in S%02d-%d\n",
492 iTrdTrack, trdTrack->GetSector(), trdTrack->GetStack());
495 // loop over all esd tracks in the same stack and check distance
496 for (UInt_t iEsdTrack = 0; iEsdTrack < esdTrackNumByStack[stack]; ++iEsdTrack){
497 matchCandidate = esdEvent->GetTrack(esdTracksByStack[stack][iEsdTrack]);
499 if (EstimateTrackDistance(matchCandidate, trdTrack, esdEvent->GetMagneticField(), &distY, &distZ) == 0){
500 Double_t rating = RateTrackMatch(distY, distZ, matchCandidate->GetSignedPt(), trdPt);
502 printf("#TRACKMATCHING S%02d-%d trd %d - esd %d dy: %.3f dz: %.3f r: %.3f pt e: %.2f t: %.2f match: %d\n",
503 trdTrack->GetSector(), trdTrack->GetStack(), iTrdTrack, iEsdTrack,
504 distY, distZ, rating, matchCandidate->GetSignedPt(), trdPt,
505 (rating >= fMinMatchRating) ? 1 : 0);
508 // possibly matching pair found
509 matchCandidateCount++;
510 if ((matchTrack == NULL) || (rating > matchRating)){
512 matchTrack = matchCandidate;
513 matchEsdTrackIndexInStack = iEsdTrack;
514 matchRating = rating;
519 // estimation of distance failed
521 printf("TRACKMATCHING S%02d-%d trd %d - esd %d failed\n",
522 trdTrack->GetSector(), trdTrack->GetStack(), iTrdTrack, iEsdTrack);
525 } // loop over esd tracks in same stack
527 if (fHistMatchRating){
528 fHistMatchRating->Fill(matchRating);
531 if ((matchTrack) && (matchRating >= fMinMatchRating)){
533 printf("#TRACKMATCHING S%02d-%d trd %d - esd %d match! pt: %.2f %.2f\n",
534 trdTrack->GetSector(), trdTrack->GetStack(), iTrdTrack, matchEsdTrackIndexInStack,
535 trdPt, matchTrack->GetSignedPt());
538 trdTrack->SetTrackMatchReference(matchTrack);
541 trdTrack->SetTrackMatchReference(NULL);
544 } // loop over TRD online tracks
549 Bool_t AliTRDonlineTrackMatching::TrackPlaneIntersect(AliExternalTrackParam *trk, Double_t pnt[3], Double_t norm[3], Double_t mag){
551 // calculates the intersection point of a track param and a plane defined by point pnt and normal vector norm
557 Double_t dist = 0, dist_prev = 0;
558 Double_t x[3] = {0., 0., 0.};
560 dist = (x[0] - pnt[0]) * norm[0] + (x[1] - pnt[1]) *norm[1] + (x[2] - pnt[2]) * norm[2];
562 while(TMath::Abs(dist) > 0.1) {
564 trk->GetXYZAt(r, mag, x);
566 if ((x[0] * x[0] + x[1] * x[1]) < 100.) // extrapolation to radius failed
569 //distance between current track position and plane
570 dist_prev = TMath::Abs(dist);
571 dist = (x[0] - pnt[0]) * norm[0] + (x[1] - pnt[1]) * norm[1];
572 if ((flag) && (TMath::Abs(dist) > dist_prev)){
578 if ((r > 380.) || (r < 100.) || (its > 100) || (TMath::Abs(step) < 0.00001)){
582 for (Int_t i=0; i<3; i++)
588 Int_t AliTRDonlineTrackMatching::EstimateTrackDistance(AliESDtrack *esd_track, AliESDTrdTrack* gtu_track, Double_t mag, Double_t *ydist, Double_t *zdist){
590 // returns an estimate for the spatial distance between TPC offline track and GTU online track
592 if ((!esd_track) || (!gtu_track))
595 // AssertTRDGeometry();
597 fTRDgeo = new AliTRDgeometry();
608 UShort_t stackInSector;
610 for (UShort_t iLayer = 0; iLayer < 6; iLayer++){
611 AliESDTrdTracklet* trkl = gtu_track->GetTracklet(iLayer);
613 trklDet = trkl->GetDetector();
614 trklLayer = TrdDetLyr(trklDet);
615 stack_gtu = TrdDetLsi(trklDet);
616 stackInSector = TrdDetSi(trklDet);
618 // local coordinates of the outer end point of the tracklet
619 xtrkl[0] = AliTRDgeometry::AnodePos();
620 xtrkl[1] = trkl->GetLocalY();
622 if(stackInSector == 2){ // corrected version by Felix Muecke
623 xtrkl[2] = fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(trkl->GetBinZ()) -
624 (fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowSize(trkl->GetBinZ()))/2. -
625 fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(6);
627 xtrkl[2] = fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(trkl->GetBinZ()) -
628 (fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowSize(trkl->GetBinZ()))/2. -
629 fTRDgeo->GetPadPlane(trklLayer, stackInSector)->GetRowPos(8);
633 // xtrkl[2] = fTRDgeo->GetPadPlane(trklLayer, (trklDet/6) % 5)->GetRowPos(trkl->GetBinZ()) -
634 // fTRDgeo->GetPadPlane(trklLayer, (trklDet/6) % 5)->GetRowSize(trkl->GetBinZ()) -
635 // fTRDgeo->GetPadPlane(trklLayer, (trklDet/6) % 5)->GetRowPos(8);
637 // transform to global coordinates
638 TGeoHMatrix *matrix = fTRDgeo->GetClusterMatrix(trklDet);
640 if ((stack_gtu != 13*5+2) && (stack_gtu != 14*5+2) && (stack_gtu != 15*5+2))
641 AliDebug(1, Form("invalid TRD cluster matrix in EstimateTrackDistance for detector %i", trklDet));
644 matrix->LocalToMaster(xtrkl, ptrkl);
645 fTRDgeo->RotateBack(gtu_track->GetSector() * 30, ptrkl, ptrkl2); // ptrkl2 now contains the global position of the outer end point of the tracklet
647 // calculate parameterization of plane representing the tracklets layer
648 Double_t layer_zero_local[3] = {0., 0., 0.};
649 Double_t layer_zero_global[3], layer_zero_global2[3];
651 matrix->LocalToMaster(layer_zero_local, layer_zero_global);
652 fTRDgeo->RotateBack(trklDet, layer_zero_global, layer_zero_global2); // layer_zero_global2 points to chamber origin in global coords
654 Double_t layer_ref_local[3] = {AliTRDgeometry::AnodePos(), 0., 0.};
655 Double_t layer_ref_global[3], layer_ref_global2[3];
657 matrix->LocalToMaster(layer_ref_local, layer_ref_global);
658 fTRDgeo->RotateBack(trklDet, layer_ref_global, layer_ref_global2); // layer_ref_global2 points to center anode pos within plane in global coords
660 Double_t n0[3] = {layer_ref_global2[0]-layer_zero_global2[0],
661 layer_ref_global2[1]-layer_zero_global2[1],
662 layer_ref_global2[2]-layer_zero_global2[2]};
664 Double_t n_len = TMath::Sqrt(n0[0]*n0[0] + n0[1]*n0[1] + n0[2]*n0[2]);
665 if (n_len == 0.){ // This should never happen
666 AliError("divison by zero in estimate_track_distance!");
669 Double_t n[3] = {n0[0]/n_len, n0[1]/n_len, n0[2]/n_len}; // normal vector of plane
671 const AliExternalTrackParam *trackParam = esd_track->GetOuterParam();
673 trackParam = esd_track->GetInnerParam();
675 trackParam = esd_track;
678 AliExternalTrackParam *outerTPC = new AliExternalTrackParam(*trackParam);
679 Bool_t isects = TrackPlaneIntersect(outerTPC, layer_ref_global2, n, mag); // find intersection point between track and TRD layer
683 if (isects == kFALSE){ // extrapolation fails, because track never reaches the TRD radius
687 Double_t m[2] = {ptrkl2[0] - layer_ref_global2[0], ptrkl2[1] - layer_ref_global2[1]};
688 Double_t len_m = TMath::Sqrt(m[0]*m[0] + m[1]*m[1]);
690 diff_z += TMath::Abs(ptrkl2[2] - layer_ref_global2[2]);
696 *ydist = diff_y / nLayers;
697 *zdist = diff_z / nLayers;
704 Double_t AliTRDonlineTrackMatching::PtDiffRel(Double_t refPt, Double_t gtuPt){
706 // return relative pt difference
708 if (TMath::Abs(refPt) > 0.000001){
709 return (gtuPt - refPt) / refPt;
715 Double_t AliTRDonlineTrackMatching::RateTrackMatch(Double_t distY, Double_t distZ, Double_t rpt, Double_t gpt){
717 // returns a match rating derived from Y and Z distance as well as pt difference
719 // maximum limits for spatial distance
720 if ((distY > 5.) || (distZ > 20.))
723 // same pt sign required
724 if ((rpt * gpt) < 0.)
727 Double_t rating_distY = -0.1 * distY + 1.;
728 Double_t rating_distZ = -0.025 * distZ + 1.;
729 Double_t rating_ptDiff = 1. - TMath::Abs(PtDiffRel(rpt, gpt));
731 if (rating_ptDiff < 0.)
734 Double_t total = rating_distY * rating_distZ * rating_ptDiff;
738 printf("<ERROR> track match rating exceeds limit of 1.0: %.3f", total);
746 void AliTRDonlineTrackMatching::SetEsdTrackDefaultCuts(const char* cutIdent) {
748 if (strcmp(cutIdent, "strict") == 0){
751 printf("AliTRDonlineTrackMatching -- default track cuts selected");
754 fEsdTrackCutMinimal = kFALSE;
755 fEsdTrackCutPrim = kFALSE;
757 fEsdTrackCutMinTPCrows = 70;
758 fEsdTrackCutRequireTPCrefit = kTRUE;
759 fEsdTrackCutMinRatioRowsFindableClusters = 0.8;
760 fEsdTrackCutMaxChi2TPCclusters = 4.;
761 fEsdTrackVCutsChi2TPCconstrainedVsGlobal = 36.;
763 fEsdTrackCutRequireITSrefit = kFALSE;
764 fEsdTrackCutMaxChi2ITSclusters = 36.;
766 fEsdTrackCutMaxDCAtoVertexXY = 1000.;
767 fEsdTrackCutMaxDCAtoVertexZ = 2.;
768 fEsdTrackCutsITSlayerMask = 0x0;
770 fEsdTrackCutPtDCAOfs = 0.0105;
771 fEsdTrackCutPtDCACoeff = 0.0350;
772 } else if (strcmp(cutIdent, "minimal") == 0){
775 printf("AliTRDonlineTrackMatching -- minimal track cuts selected\n");
778 fEsdTrackCutMinimal = kFALSE;
779 fEsdTrackCutPrim = kFALSE;
781 fEsdTrackCutMinTPCrows = 70;
782 fEsdTrackCutRequireTPCrefit = kTRUE;
783 fEsdTrackCutMinRatioRowsFindableClusters = 0.;
784 fEsdTrackCutMaxChi2TPCclusters = 100.;
785 fEsdTrackVCutsChi2TPCconstrainedVsGlobal = 1000.;
787 fEsdTrackCutRequireITSrefit = kFALSE;
788 fEsdTrackCutMaxChi2ITSclusters = 0.;
790 fEsdTrackCutMaxDCAtoVertexXY = 1000.;
791 fEsdTrackCutMaxDCAtoVertexZ = 1000.;
792 fEsdTrackCutsITSlayerMask = 0x0;
794 AliErrorClass("invalid cut set");