1 /**************************************************************************
2 * Copyright(c) 1998-1999, 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 **************************************************************************/
18 ///////////////////////////////////////////////////
20 // Reconstructed track
26 ///////////////////////////////////////////////////
28 #include "AliMUONTrack.h"
30 #include "AliMUONTrackReconstructor.h"
31 #include "AliMUONHitForRec.h"
32 #include "AliMUONSegment.h"
33 #include "AliMUONTrackHit.h"
34 #include "AliMUONTriggerTrack.h"
35 #include "AliMUONConstants.h"
39 #include <Riostream.h> // for cout
42 #include <TObjArray.h>
43 #include <TVirtualFitter.h>
45 #include <stdlib.h> // for exit()
47 // Functions to be minimized with Minuit
48 void TrackChi2(Int_t &NParam, Double_t *Gradient, Double_t &Chi2, Double_t *Param, Int_t Flag);
49 void TrackChi2MCS(Int_t &NParam, Double_t *Gradient, Double_t &Chi2, Double_t *Param, Int_t Flag);
51 void mnvertLocal(Double_t* a, Int_t l, Int_t m, Int_t n, Int_t& ifail);
53 Double_t MultipleScatteringAngle2(AliMUONTrackHit *TrackHit);
55 TVirtualFitter* AliMUONTrack::fgFitter = NULL;
57 ClassImp(AliMUONTrack) // Class implementation in ROOT context
59 //__________________________________________________________________________
60 AliMUONTrack::AliMUONTrack()
63 // Default constructor
65 fTrackReconstructor = 0;
67 fTrackParamAtHit = NULL;
68 fHitForRecAtHit = NULL;
72 //__________________________________________________________________________
73 AliMUONTrack::AliMUONTrack(AliMUONSegment* BegSegment, AliMUONSegment* EndSegment, AliMUONTrackReconstructor* TrackReconstructor)
76 // Constructor from two Segment's
77 fTrackReconstructor = TrackReconstructor; // link back to TrackReconstructor
78 // memory allocation for the TObjArray of pointers to reconstructed TrackHit's
79 fTrackHitsPtr = new TObjArray(10);
81 if (BegSegment) { //AZ
82 AddSegment(BegSegment); // add hits from BegSegment
83 AddSegment(EndSegment); // add hits from EndSegment
84 fTrackHitsPtr->Sort(); // sort TrackHits according to increasing Z
85 SetTrackParamAtVertex(); // set track parameters at vertex
87 fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",10);
88 fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",10);
89 // set fit conditions...
94 fMatchTrigger = kFALSE;
95 fChi2MatchTrigger = 0;
100 //__________________________________________________________________________
101 AliMUONTrack::AliMUONTrack(AliMUONSegment* Segment, AliMUONHitForRec* HitForRec, AliMUONTrackReconstructor* TrackReconstructor)
104 // Constructor from one Segment and one HitForRec
105 fTrackReconstructor = TrackReconstructor; // link back to TrackReconstructor
106 // memory allocation for the TObjArray of pointers to reconstructed TrackHit's
107 fTrackHitsPtr = new TObjArray(10);
109 AddSegment(Segment); // add hits from Segment
110 AddHitForRec(HitForRec); // add HitForRec
111 fTrackHitsPtr->Sort(); // sort TrackHits according to increasing Z
112 SetTrackParamAtVertex(); // set track parameters at vertex
113 fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",10);
114 fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",10);
115 // set fit conditions...
120 fMatchTrigger = kFALSE;
121 fChi2MatchTrigger = 0;
126 //__________________________________________________________________________
127 AliMUONTrack::~AliMUONTrack()
131 // delete the TObjArray of pointers to TrackHit's
132 delete fTrackHitsPtr;
133 fTrackHitsPtr = NULL;
136 if (fTrackParamAtHit) {
137 // delete the TClonesArray of pointers to TrackParam
138 delete fTrackParamAtHit;
139 fTrackParamAtHit = NULL;
142 if (fHitForRecAtHit) {
143 // delete the TClonesArray of pointers to HitForRec
144 delete fHitForRecAtHit;
145 fHitForRecAtHit = NULL;
149 //__________________________________________________________________________
150 AliMUONTrack::AliMUONTrack (const AliMUONTrack& theMUONTrack)
151 : TObject(theMUONTrack)
153 //fTrackReconstructor = new AliMUONTrackReconstructor(*MUONTrack.fTrackReconstructor);
155 // NO, because it would use dummy copy constructor
156 // and AliMUONTrack is not the owner of its TrackReconstructor
157 fTrackReconstructor = theMUONTrack.fTrackReconstructor;
158 fTrackParamAtVertex = theMUONTrack.fTrackParamAtVertex;
160 // necessary to make a copy of the objects and not only the pointers in TObjArray.
162 if (theMUONTrack.fTrackHitsPtr) {
163 fTrackHitsPtr = new TObjArray(10);
164 for (Int_t index = 0; index < (theMUONTrack.fTrackHitsPtr)->GetEntriesFast(); index++) {
165 AliMUONTrackHit *trackHit = new AliMUONTrackHit(*(AliMUONTrackHit*)(theMUONTrack.fTrackHitsPtr)->At(index));
166 fTrackHitsPtr->Add(trackHit);
168 fTrackHitsPtr->SetOwner(); // nedeed for deleting TClonesArray
171 // necessary to make a copy of the objects and not only the pointers in TClonesArray.
172 fTrackParamAtHit = 0;
173 if (theMUONTrack.fTrackParamAtHit) {
174 fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",10);
175 for (Int_t index = 0; index < (theMUONTrack.fTrackParamAtHit)->GetEntriesFast(); index++) {
176 {new ((*fTrackParamAtHit)[fTrackParamAtHit->GetEntriesFast()])
177 AliMUONTrackParam(*(AliMUONTrackParam*)(theMUONTrack.fTrackParamAtHit)->At(index));}
181 // necessary to make a copy of the objects and not only the pointers in TClonesArray.
183 if (theMUONTrack.fHitForRecAtHit) {
184 fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",10);
185 for (Int_t index = 0; index < (theMUONTrack.fHitForRecAtHit)->GetEntriesFast(); index++) {
186 {new ((*fHitForRecAtHit)[fHitForRecAtHit->GetEntriesFast()])
187 AliMUONHitForRec(*(AliMUONHitForRec*)(theMUONTrack.fHitForRecAtHit)->At(index));}
191 fNTrackHits = theMUONTrack.fNTrackHits;
192 fFitMCS = theMUONTrack.fFitMCS;
193 fFitNParam = theMUONTrack.fFitNParam;
194 fFitFMin = theMUONTrack.fFitFMin;
195 fFitStart = theMUONTrack.fFitStart;
196 fMatchTrigger = theMUONTrack.fMatchTrigger;
197 fChi2MatchTrigger = theMUONTrack.fChi2MatchTrigger;
198 fTrackID = theMUONTrack.fTrackID;
201 //__________________________________________________________________________
202 AliMUONTrack & AliMUONTrack::operator=(const AliMUONTrack& theMUONTrack)
205 // check assignement to self
206 if (this == &theMUONTrack)
209 // base class assignement
210 TObject::operator=(theMUONTrack);
212 // fTrackReconstructor = new AliMUONTrackReconstructor(*MUONTrack.fTrackReconstructor);
214 // is it right ? NO because it would use dummy copy constructor
215 fTrackReconstructor = theMUONTrack.fTrackReconstructor;
216 fTrackParamAtVertex = theMUONTrack.fTrackParamAtVertex;
218 // necessary to make a copy of the objects and not only the pointers in TObjArray.
220 if (theMUONTrack.fTrackHitsPtr) {
221 fTrackHitsPtr = new TObjArray(10);
222 for (Int_t index = 0; index < (theMUONTrack.fTrackHitsPtr)->GetEntriesFast(); index++) {
223 AliMUONTrackHit *trackHit = new AliMUONTrackHit(*(AliMUONTrackHit*)(theMUONTrack.fTrackHitsPtr)->At(index));
224 fTrackHitsPtr->Add(trackHit);
226 fTrackHitsPtr->SetOwner(); // nedeed for deleting TClonesArray
229 // necessary to make a copy of the objects and not only the pointers in TClonesArray.
230 fTrackParamAtHit = 0;
231 if (theMUONTrack.fTrackParamAtHit) {
232 fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",10);
233 for (Int_t index = 0; index < (theMUONTrack.fTrackParamAtHit)->GetEntriesFast(); index++) {
234 {new ((*fTrackParamAtHit)[fTrackParamAtHit->GetEntriesFast()])
235 AliMUONTrackParam(*(AliMUONTrackParam*)(theMUONTrack.fTrackParamAtHit)->At(index));}
239 // necessary to make a copy of the objects and not only the pointers in TClonesArray.
241 if (theMUONTrack.fHitForRecAtHit) {
242 fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",10);
243 for (Int_t index = 0; index < (theMUONTrack.fHitForRecAtHit)->GetEntriesFast(); index++) {
244 {new ((*fHitForRecAtHit)[fHitForRecAtHit->GetEntriesFast()])
245 AliMUONHitForRec(*(AliMUONHitForRec*)(theMUONTrack.fHitForRecAtHit)->At(index));}
249 fNTrackHits = theMUONTrack.fNTrackHits;
250 fFitMCS = theMUONTrack.fFitMCS;
251 fFitNParam = theMUONTrack.fFitNParam;
252 fFitFMin = theMUONTrack.fFitFMin;
253 fFitStart = theMUONTrack.fFitStart;
254 fMatchTrigger = theMUONTrack.fMatchTrigger;
255 fChi2MatchTrigger = theMUONTrack.fChi2MatchTrigger;
256 fTrackID = theMUONTrack.fTrackID;
261 //__________________________________________________________________________
262 void AliMUONTrack::Remove()
264 // Remove current track from array of tracks,
265 // and corresponding track hits from array of track hits.
266 // Compress the TClonesArray it belongs to.
267 AliMUONTrackHit *nextTrackHit;
268 AliMUONTrackReconstructor *eventRec = this->fTrackReconstructor;
269 TClonesArray *trackHitsPtr = eventRec->GetRecTrackHitsPtr();
270 // Loop over all track hits of track
271 AliMUONTrackHit *trackHit = (AliMUONTrackHit*) fTrackHitsPtr->First();
273 nextTrackHit = (AliMUONTrackHit*) fTrackHitsPtr->After(trackHit);
274 // Remove TrackHit from event TClonesArray.
275 // Destructor is called,
276 // hence links between HitForRec's and TrackHit's are updated
277 trackHitsPtr->Remove(trackHit);
278 trackHit = nextTrackHit;
280 // Remove the track from event TClonesArray
281 // Destructor is called,
282 // hence space for TObjArray of pointers to TrackHit's is freed
283 eventRec->GetRecTracksPtr()->Remove(this);
284 // Number of tracks decreased by 1
285 eventRec->SetNRecTracks(eventRec->GetNRecTracks() - 1);
286 // Compress event TClonesArray of Track's:
287 // this is essential to retrieve the TClonesArray afterwards
288 eventRec->GetRecTracksPtr()->Compress();
289 // Compress event TClonesArray of TrackHit's:
290 // this is probably also essential to retrieve the TClonesArray afterwards
291 trackHitsPtr->Compress();
294 //__________________________________________________________________________
295 void AliMUONTrack::SetFitMCS(Int_t FitMCS)
297 // Set multiple Coulomb scattering option for track fit "fFitMCS"
298 // from "FitMCS" argument: 0 without, 1 with
299 if ((FitMCS == 0) || (FitMCS == 1)) fFitMCS = FitMCS;
300 // better implementation with enum(with, without) ????
302 cout << "ERROR in AliMUONTrack::SetFitMCS(FitMCS)" << endl;
303 cout << "FitMCS = " << FitMCS << " is neither 0 nor 1" << endl;
309 //__________________________________________________________________________
310 void AliMUONTrack::SetFitNParam(Int_t FitNParam)
312 // Set number of parameters for track fit "fFitNParam" from "FitNParam":
313 // 3 for momentum, 5 for momentum and position
314 if ((FitNParam == 3) || (FitNParam == 5)) fFitNParam = FitNParam;
316 cout << "ERROR in AliMUONTrack::SetFitNParam(FitNParam)" << endl;
317 cout << "FitNParam = " << FitNParam << " is neither 3 nor 5" << endl;
323 //__________________________________________________________________________
324 void AliMUONTrack::SetFitStart(Int_t FitStart)
326 // Set multiple Coulomb scattering option for track fit "fFitStart"
327 // from "FitStart" argument: 0 without, 1 with
328 if ((FitStart == 0) || (FitStart == 1)) fFitStart = FitStart;
329 // better implementation with enum(vertex, firstHit) ????
331 cout << "ERROR in AliMUONTrack::SetFitStart(FitStart)" << endl;
332 cout << "FitStart = " << FitStart << " is neither 0 nor 1" << endl;
338 //__________________________________________________________________________
339 AliMUONTrackParam* AliMUONTrack::GetTrackParamAtFirstHit(void) const {
340 // Get pointer to TrackParamAtFirstHit
341 return ((AliMUONTrackHit*) (fTrackHitsPtr->First()))->GetTrackParam();}
343 //__________________________________________________________________________
344 void AliMUONTrack::RecursiveDump(void) const
346 // Recursive dump of AliMUONTrack, i.e. with dump of TrackHit's and HitForRec's
347 AliMUONTrackHit *trackHit;
348 AliMUONHitForRec *hitForRec;
349 cout << "Recursive dump of Track: " << this << endl;
352 for (Int_t trackHitIndex = 0; trackHitIndex < fNTrackHits; trackHitIndex++) {
353 trackHit = (AliMUONTrackHit*) ((*fTrackHitsPtr)[trackHitIndex]);
355 cout << "TrackHit: " << trackHit << " (index: " << trackHitIndex << ")" << endl;
357 hitForRec = trackHit->GetHitForRecPtr();
359 cout << "HitForRec: " << hitForRec << endl;
365 //__________________________________________________________________________
366 Bool_t* AliMUONTrack::CompatibleTrack(AliMUONTrack * Track, Double_t Sigma2Cut) const
368 // Return kTRUE/kFALSE for each chamber if hit is compatible or not
369 TClonesArray *hitArray, *thisHitArray;
370 AliMUONHitForRec *hit, *thisHit;
373 Float_t deltaZMax = 1.; // 1 cm
375 Bool_t *nCompHit = new Bool_t[AliMUONConstants::NTrackingCh()];
377 for ( Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) {
378 nCompHit[ch] = kFALSE;
381 thisHitArray = this->GetHitForRecAtHit();
383 hitArray = Track->GetHitForRecAtHit();
385 for (Int_t iHthis = 0; iHthis < thisHitArray->GetEntriesFast(); iHthis++) {
386 thisHit = (AliMUONHitForRec*) thisHitArray->At(iHthis);
387 chamberNumber = thisHit->GetChamberNumber();
388 if (chamberNumber < 0 || chamberNumber > AliMUONConstants::NTrackingCh()) continue;
389 nCompHit[chamberNumber] = kFALSE;
390 for (Int_t iH = 0; iH < hitArray->GetEntriesFast(); iH++) {
391 hit = (AliMUONHitForRec*) hitArray->At(iH);
392 deltaZ = TMath::Abs(thisHit->GetZ() - hit->GetZ());
393 chi2 = thisHit->NormalizedChi2WithHitForRec(hit,Sigma2Cut); // set cut to 4 sigmas
394 if (chi2 < 3. && deltaZ < deltaZMax) {
395 nCompHit[chamberNumber] = kTRUE;
404 //__________________________________________________________________________
405 Int_t AliMUONTrack::HitsInCommon(AliMUONTrack* Track) const
407 // Returns the number of hits in common
408 // between the current track ("this")
409 // and the track pointed to by "Track".
410 Int_t hitsInCommon = 0;
411 AliMUONTrackHit *trackHit1, *trackHit2;
412 // Loop over hits of first track
413 trackHit1 = (AliMUONTrackHit*) this->GetTrackHitsPtr()->First();
415 // Loop over hits of second track
416 trackHit2 = (AliMUONTrackHit*) Track->GetTrackHitsPtr()->First();
418 // Increment "hitsInCommon" if both TrackHits point to the same HitForRec
419 if ( (trackHit1->GetHitForRecPtr()) ==
420 (trackHit2->GetHitForRecPtr()) ) hitsInCommon++;
421 trackHit2 = (AliMUONTrackHit*) Track->GetTrackHitsPtr()->After(trackHit2);
423 trackHit1 = (AliMUONTrackHit*) this->GetTrackHitsPtr()->After(trackHit1);
428 //__________________________________________________________________________
429 void AliMUONTrack::MatchTriggerTrack(TClonesArray *triggerTrackArray)
431 // Match this track with one trigger track if possible
432 AliMUONTrackParam trackParam;
433 AliMUONTriggerTrack *triggerTrack;
434 Double_t xTrack, yTrack, ySlopeTrack, dTrigTrackMin2, dTrigTrack2;
437 Double_t distSigma[3]={1,1,0.02}; // sigma of distributions (trigger-track) X,Y,slopeY
438 Double_t distTriggerTrack[3] = {0,0,0};
440 fMatchTrigger = kFALSE;
441 fChi2MatchTrigger = 0;
443 trackParam = *((AliMUONTrackParam*) fTrackParamAtHit->Last());
444 trackParam.ExtrapToZ(AliMUONConstants::DefaultChamberZ(10)); // extrap to 1st trigger chamber
446 nSigmaCut2 = fTrackReconstructor->GetMaxSigma2Distance(); // nb of sigma**2 for cut
447 xTrack = trackParam.GetNonBendingCoor();
448 yTrack = trackParam.GetBendingCoor();
449 ySlopeTrack = trackParam.GetBendingSlope();
450 dTrigTrackMin2 = 999;
452 triggerTrack = (AliMUONTriggerTrack*) triggerTrackArray->First();
454 distTriggerTrack[0] = (triggerTrack->GetX11()-xTrack)/distSigma[0];
455 distTriggerTrack[1] = (triggerTrack->GetY11()-yTrack)/distSigma[1];
456 distTriggerTrack[2] = (TMath::Tan(triggerTrack->GetThetay())-ySlopeTrack)/distSigma[2];
458 for (Int_t iVar = 0; iVar < 3; iVar++)
459 dTrigTrack2 += distTriggerTrack[iVar]*distTriggerTrack[iVar];
460 if (dTrigTrack2 < dTrigTrackMin2 && dTrigTrack2 < nSigmaCut2) {
461 dTrigTrackMin2 = dTrigTrack2;
462 fMatchTrigger = kTRUE;
463 fChi2MatchTrigger = dTrigTrack2/3.; // Normalized Chi2, 3 variables (X,Y,slopeY)
465 triggerTrack = (AliMUONTriggerTrack*) triggerTrackArray->After(triggerTrack);
469 //__________________________________________________________________________
470 void AliMUONTrack::Fit()
472 // Fit the current track ("this"),
473 // with or without multiple Coulomb scattering according to "fFitMCS",
474 // with the number of parameters given by "fFitNParam"
475 // (3 if one keeps X and Y fixed in "TrackParam", 5 if one lets them vary),
476 // starting, according to "fFitStart",
477 // with track parameters at vertex or at the first TrackHit.
478 // "fFitMCS", "fFitNParam" and "fFitStart" have to be set before
479 // by calling the corresponding Set methods.
480 Double_t arg[1], benC, errorParam, invBenP, lower, nonBenC, upper, x, y;
482 AliMUONTrackParam *trackParam;
483 // Check if Minuit is initialized...
484 fgFitter = TVirtualFitter::Fitter(this); // add 3 or 5 for the maximum number of parameters ???
485 fgFitter->Clear(); // necessary ???? probably yes
486 // how to reset the printout number at every fit ????
487 // is there any risk to leave it like that ????
488 // how to go faster ???? choice of Minuit parameters like EDM ????
489 // choice of function to be minimized according to fFitMCS
490 if (fFitMCS == 0) fgFitter->SetFCN(TrackChi2);
491 else fgFitter->SetFCN(TrackChi2MCS);
492 // Switch off printout
494 fgFitter->ExecuteCommand("SET PRINT", arg, 1); // More printing !!!!
496 fgFitter->ExecuteCommand("SET NOW", arg, 0);
497 // Parameters according to "fFitStart"
498 // (should be a function to be used at every place where needed ????)
499 if (fFitStart == 0) trackParam = &fTrackParamAtVertex;
500 else trackParam = this->GetTrackParamAtFirstHit();
501 // set first 3 Minuit parameters
502 // could be tried with no limits for the search (min=max=0) ????
503 fgFitter->SetParameter(0, "InvBenP",
504 trackParam->GetInverseBendingMomentum(),
506 fgFitter->SetParameter(1, "BenS",
507 trackParam->GetBendingSlope(),
509 fgFitter->SetParameter(2, "NonBenS",
510 trackParam->GetNonBendingSlope(),
512 if (fFitNParam == 5) {
513 // set last 2 Minuit parameters
514 // mandatory limits in Bending to avoid NaN values of parameters
515 fgFitter->SetParameter(3, "X",
516 trackParam->GetNonBendingCoor(),
517 0.03, -500.0, 500.0);
518 // mandatory limits in non Bending to avoid NaN values of parameters
519 fgFitter->SetParameter(4, "Y",
520 trackParam->GetBendingCoor(),
521 0.10, -500.0, 500.0);
523 // search without gradient calculation in the function
524 fgFitter->ExecuteCommand("SET NOGRADIENT", arg, 0);
526 fgFitter->ExecuteCommand("MINIMIZE", arg, 0);
528 // fgFitter->ExecuteCommand("EXIT", arg, 0); // necessary ????
529 // get results into "invBenP", "benC", "nonBenC" ("x", "y")
530 fgFitter->GetParameter(0, parName, invBenP, errorParam, lower, upper);
531 fgFitter->GetParameter(1, parName, benC, errorParam, lower, upper);
532 fgFitter->GetParameter(2, parName, nonBenC, errorParam, lower, upper);
533 if (fFitNParam == 5) {
534 fgFitter->GetParameter(3, parName, x, errorParam, lower, upper);
535 fgFitter->GetParameter(4, parName, y, errorParam, lower, upper);
537 // result of the fit into track parameters
538 trackParam->SetInverseBendingMomentum(invBenP);
539 trackParam->SetBendingSlope(benC);
540 trackParam->SetNonBendingSlope(nonBenC);
541 if (fFitNParam == 5) {
542 trackParam->SetNonBendingCoor(x);
543 trackParam->SetBendingCoor(y);
545 // global result of the fit
546 Double_t fedm, errdef;
548 fgFitter->GetStats(fFitFMin, fedm, errdef, npari, nparx);
551 //__________________________________________________________________________
552 void AliMUONTrack::AddSegment(AliMUONSegment* Segment)
554 // Add Segment to the track
555 AddHitForRec(Segment->GetHitForRec1()); // 1st hit
556 AddHitForRec(Segment->GetHitForRec2()); // 2nd hit
559 //__________________________________________________________________________
560 void AliMUONTrack::AddHitForRec(AliMUONHitForRec* HitForRec)
562 // Add HitForRec to the track:
563 // actual TrackHit into TClonesArray of TrackHit's for the event;
564 // pointer to actual TrackHit in TObjArray of pointers to TrackHit's for the track
565 TClonesArray *recTrackHitsPtr = this->fTrackReconstructor->GetRecTrackHitsPtr();
566 Int_t eventTrackHits = this->fTrackReconstructor->GetNRecTrackHits();
568 AliMUONTrackHit* trackHit =
569 new ((*recTrackHitsPtr)[eventTrackHits]) AliMUONTrackHit(HitForRec);
570 this->fTrackReconstructor->SetNRecTrackHits(eventTrackHits + 1);
572 if (fTrackHitsPtr->IsOwner()) AliFatal("fTrackHitsPtr is owner");
573 fTrackHitsPtr->Add(trackHit);
577 //__________________________________________________________________________
578 void AliMUONTrack::SetTrackParamAtHit(Int_t indexHit, AliMUONTrackParam *TrackParam) const
580 // Set track parameters at TrackHit with index "indexHit"
581 // from the track parameters pointed to by "TrackParam".
582 //PH AliMUONTrackHit* trackHit = (AliMUONTrackHit*) ((*fTrackHitsPtr)[indexHit]);
583 AliMUONTrackHit* trackHit = (AliMUONTrackHit*) (fTrackHitsPtr->At(indexHit));
584 trackHit->SetTrackParam(TrackParam);
587 //__________________________________________________________________________
588 void AliMUONTrack::SetTrackParamAtVertex()
590 // Set track parameters at vertex.
591 // TrackHit's are assumed to be only in stations(1..) 4 and 5,
592 // and sorted according to increasing Z..
593 // Parameters are calculated from information in HitForRec's
594 // of first and last TrackHit's.
595 AliMUONTrackParam *trackParam =
596 &fTrackParamAtVertex; // pointer to track parameters
597 // Pointer to HitForRec of first TrackHit
598 AliMUONHitForRec *firstHit =
599 ((AliMUONTrackHit*) (fTrackHitsPtr->First()))->GetHitForRecPtr();
600 // Pointer to HitForRec of last TrackHit
601 AliMUONHitForRec *lastHit =
602 ((AliMUONTrackHit*) (fTrackHitsPtr->Last()))->GetHitForRecPtr();
603 // Z difference between first and last hits
604 Double_t deltaZ = firstHit->GetZ() - lastHit->GetZ();
605 // bending slope in stations(1..) 4 and 5
606 Double_t bendingSlope =
607 (firstHit->GetBendingCoor() - lastHit->GetBendingCoor()) / deltaZ;
608 trackParam->SetBendingSlope(bendingSlope);
610 Double_t impactParam =
611 firstHit->GetBendingCoor() - bendingSlope * firstHit->GetZ(); // same if from firstHit and lastHit ????
612 // signed bending momentum
613 Double_t signedBendingMomentum =
614 fTrackReconstructor->GetBendingMomentumFromImpactParam(impactParam);
615 trackParam->SetInverseBendingMomentum(1.0 / signedBendingMomentum);
616 // bending slope at vertex
618 SetBendingSlope(bendingSlope +
619 impactParam / fTrackReconstructor->GetSimpleBPosition());
621 Double_t nonBendingSlope =
622 (firstHit->GetNonBendingCoor() - lastHit->GetNonBendingCoor()) / deltaZ;
623 trackParam->SetNonBendingSlope(nonBendingSlope);
624 // vertex coordinates at (0,0,0)
625 trackParam->SetZ(0.0);
626 trackParam->SetBendingCoor(0.0);
627 trackParam->SetNonBendingCoor(0.0);
630 //__________________________________________________________________________
631 void AliMUONTrack::AddTrackParamAtHit(const AliMUONTrackParam *trackParam)
633 // Add track paremeters
635 if (!fTrackParamAtHit)
636 fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",10);
638 new ((*fTrackParamAtHit)[fTrackParamAtHit->GetEntriesFast()]) AliMUONTrackParam(*trackParam);
641 //__________________________________________________________________________
642 void AliMUONTrack::AddHitForRecAtHit(const AliMUONHitForRec *hitForRec)
644 if (!fHitForRecAtHit)
645 fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",10);
647 new ((*fHitForRecAtHit)[fHitForRecAtHit->GetEntriesFast()]) AliMUONHitForRec(*hitForRec);
650 //__________________________________________________________________________
651 void TrackChi2(Int_t &NParam, Double_t * /*Gradient*/, Double_t &Chi2, Double_t *Param, Int_t /*Flag*/)
653 // Return the "Chi2" to be minimized with Minuit for track fitting,
654 // with "NParam" parameters
655 // and their current values in array pointed to by "Param".
656 // Assumes that the track hits are sorted according to increasing Z.
657 // Track parameters at each TrackHit are updated accordingly.
658 // Multiple Coulomb scattering is not taken into account
659 AliMUONTrack *trackBeingFitted;
660 AliMUONTrackHit* hit;
661 AliMUONTrackParam param1;
664 Chi2 = 0.0; // initialize Chi2
665 // copy of track parameters to be fitted
666 trackBeingFitted = (AliMUONTrack*) AliMUONTrack::Fitter()->GetObjectFit();
667 if (trackBeingFitted->GetFitStart() == 0)
668 param1 = *(trackBeingFitted->GetTrackParamAtVertex());
669 else param1 = *(trackBeingFitted->GetTrackParamAtFirstHit());
670 // Minuit parameters to be fitted into this copy
671 param1.SetInverseBendingMomentum(Param[0]);
672 param1.SetBendingSlope(Param[1]);
673 param1.SetNonBendingSlope(Param[2]);
675 param1.SetNonBendingCoor(Param[3]);
676 param1.SetBendingCoor(Param[4]);
678 // Follow track through all planes of track hits
679 for (hitNumber = 0; hitNumber < trackBeingFitted->GetNTrackHits(); hitNumber++) {
680 hit = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber];
681 zHit = hit->GetHitForRecPtr()->GetZ();
682 // do something special if 2 hits with same Z ????
683 // security against infinite loop ????
684 (¶m1)->ExtrapToZ(zHit); // extrapolation
685 hit->SetTrackParam(¶m1);
687 // done hit per hit, with hit resolution,
688 // and not with point and angle like in "reco_muon.F" !!!!
689 // Needs to add multiple scattering contribution ????
691 hit->GetHitForRecPtr()->GetNonBendingCoor() - (¶m1)->GetNonBendingCoor();
693 hit->GetHitForRecPtr()->GetBendingCoor() - (¶m1)->GetBendingCoor();
696 dX * dX / hit->GetHitForRecPtr()->GetNonBendingReso2() +
697 dY * dY / hit->GetHitForRecPtr()->GetBendingReso2();
701 //__________________________________________________________________________
702 void TrackChi2MCS(Int_t &NParam, Double_t * /*Gradient*/, Double_t &Chi2, Double_t *Param, Int_t /*Flag*/)
704 // Return the "Chi2" to be minimized with Minuit for track fitting,
705 // with "NParam" parameters
706 // and their current values in array pointed to by "Param".
707 // Assumes that the track hits are sorted according to increasing Z.
708 // Track parameters at each TrackHit are updated accordingly.
709 // Multiple Coulomb scattering is taken into account with covariance matrix.
710 AliMUONTrack *trackBeingFitted;
711 AliMUONTrackParam param1;
712 Chi2 = 0.0; // initialize Chi2
713 // copy of track parameters to be fitted
714 trackBeingFitted = (AliMUONTrack*) AliMUONTrack::Fitter()->GetObjectFit();
715 if (trackBeingFitted->GetFitStart() == 0)
716 param1 = *(trackBeingFitted->GetTrackParamAtVertex());
717 else param1 = *(trackBeingFitted->GetTrackParamAtFirstHit());
718 // Minuit parameters to be fitted into this copy
719 param1.SetInverseBendingMomentum(Param[0]);
720 param1.SetBendingSlope(Param[1]);
721 param1.SetNonBendingSlope(Param[2]);
723 param1.SetNonBendingCoor(Param[3]);
724 param1.SetBendingCoor(Param[4]);
727 AliMUONTrackHit *hit;
728 Int_t chCurrent, chPrev = 0, hitNumber, hitNumber1, hitNumber2, hitNumber3;
729 Double_t z, z1, z2, z3;
730 AliMUONTrackHit *hit1, *hit2, *hit3;
731 Double_t hbc1, hbc2, pbc1, pbc2;
732 Double_t hnbc1, hnbc2, pnbc1, pnbc2;
733 Int_t numberOfHit = trackBeingFitted->GetNTrackHits();
734 TMatrixD *covBending = new TMatrixD(numberOfHit, numberOfHit);
735 TMatrixD *covNonBending = new TMatrixD(numberOfHit, numberOfHit);
736 Double_t *msa2 = new Double_t[numberOfHit];
738 // Predicted coordinates and multiple scattering angles are first calculated
739 for (hitNumber = 0; hitNumber < numberOfHit; hitNumber++) {
740 hit = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber];
741 z = hit->GetHitForRecPtr()->GetZ();
742 // do something special if 2 hits with same Z ????
743 // security against infinite loop ????
744 (¶m1)->ExtrapToZ(z); // extrapolation
745 hit->SetTrackParam(¶m1);
746 // square of multiple scattering angle at current hit, with one chamber
747 msa2[hitNumber] = MultipleScatteringAngle2(hit);
748 // correction for eventual missing hits or multiple hits in a chamber,
749 // according to the number of chambers
750 // between the current hit and the previous one
751 chCurrent = hit->GetHitForRecPtr()->GetChamberNumber();
752 if (hitNumber > 0) msa2[hitNumber] = msa2[hitNumber] * (chCurrent - chPrev);
756 // Calculates the covariance matrix
757 for (hitNumber1 = 0; hitNumber1 < numberOfHit; hitNumber1++) {
758 hit1 = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber1];
759 z1 = hit1->GetHitForRecPtr()->GetZ();
760 for (hitNumber2 = hitNumber1; hitNumber2 < numberOfHit; hitNumber2++) {
761 hit2 = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber2];
762 z2 = hit2->GetHitForRecPtr()->GetZ();
763 // initialization to 0 (diagonal plus upper triangular part)
764 (*covBending)(hitNumber2, hitNumber1) = 0.0;
765 // contribution from multiple scattering in bending plane:
766 // loop over upstream hits
767 for (hitNumber3 = 0; hitNumber3 < hitNumber1; hitNumber3++) {
768 hit3 = (AliMUONTrackHit*)
769 (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber3];
770 z3 = hit3->GetHitForRecPtr()->GetZ();
771 (*covBending)(hitNumber2, hitNumber1) =
772 (*covBending)(hitNumber2, hitNumber1) +
773 ((z1 - z3) * (z2 - z3) * msa2[hitNumber3]);
775 // equal contribution from multiple scattering in non bending plane
776 (*covNonBending)(hitNumber2, hitNumber1) =
777 (*covBending)(hitNumber2, hitNumber1);
778 if (hitNumber1 == hitNumber2) {
779 // Diagonal elements: add contribution from position measurements
781 (*covBending)(hitNumber2, hitNumber1) =
782 (*covBending)(hitNumber2, hitNumber1) +
783 hit1->GetHitForRecPtr()->GetBendingReso2();
784 // and in non bending plane
785 (*covNonBending)(hitNumber2, hitNumber1) =
786 (*covNonBending)(hitNumber2, hitNumber1) +
787 hit1->GetHitForRecPtr()->GetNonBendingReso2();
790 // Non diagonal elements: symmetrization
792 (*covBending)(hitNumber1, hitNumber2) =
793 (*covBending)(hitNumber2, hitNumber1);
794 // and non bending plane
795 (*covNonBending)(hitNumber1, hitNumber2) =
796 (*covNonBending)(hitNumber2, hitNumber1);
798 } // for (hitNumber2 = hitNumber1;...
799 } // for (hitNumber1 = 0;...
801 // Inversion of covariance matrices
802 // with "mnvertLocal", local "mnvert" function of Minuit.
803 // One cannot use directly "mnvert" since "TVirtualFitter" does not know it.
804 // One will have to replace this local function by the right inversion function
805 // from a specialized Root package for symmetric positive definite matrices,
806 // when available!!!!
808 mnvertLocal(&((*covBending)(0,0)), numberOfHit, numberOfHit, numberOfHit,
810 Int_t ifailNonBending;
811 mnvertLocal(&((*covNonBending)(0,0)), numberOfHit, numberOfHit, numberOfHit,
814 // It would be worth trying to calculate the inverse of the covariance matrix
815 // only once per fit, since it cannot change much in principle,
816 // and it would save a lot of computing time !!!!
819 if ((ifailBending == 0) && (ifailNonBending == 0)) {
820 // with Multiple Scattering if inversion correct
821 for (hitNumber1 = 0; hitNumber1 < numberOfHit ; hitNumber1++) {
822 hit1 = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber1];
823 hbc1 = hit1->GetHitForRecPtr()->GetBendingCoor();
824 pbc1 = hit1->GetTrackParam()->GetBendingCoor();
825 hnbc1 = hit1->GetHitForRecPtr()->GetNonBendingCoor();
826 pnbc1 = hit1->GetTrackParam()->GetNonBendingCoor();
827 for (hitNumber2 = 0; hitNumber2 < numberOfHit; hitNumber2++) {
828 hit2 = (AliMUONTrackHit*)
829 (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber2];
830 hbc2 = hit2->GetHitForRecPtr()->GetBendingCoor();
831 pbc2 = hit2->GetTrackParam()->GetBendingCoor();
832 hnbc2 = hit2->GetHitForRecPtr()->GetNonBendingCoor();
833 pnbc2 = hit2->GetTrackParam()->GetNonBendingCoor();
835 ((*covBending)(hitNumber2, hitNumber1) *
836 (hbc1 - pbc1) * (hbc2 - pbc2)) +
837 ((*covNonBending)(hitNumber2, hitNumber1) *
838 (hnbc1 - pnbc1) * (hnbc2 - pnbc2));
842 // without Multiple Scattering if inversion impossible
843 for (hitNumber1 = 0; hitNumber1 < numberOfHit ; hitNumber1++) {
844 hit1 = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber1];
845 hbc1 = hit1->GetHitForRecPtr()->GetBendingCoor();
846 pbc1 = hit1->GetTrackParam()->GetBendingCoor();
847 hnbc1 = hit1->GetHitForRecPtr()->GetNonBendingCoor();
848 pnbc1 = hit1->GetTrackParam()->GetNonBendingCoor();
850 ((hbc1 - pbc1) * (hbc1 - pbc1) /
851 hit1->GetHitForRecPtr()->GetBendingReso2()) +
852 ((hnbc1 - pnbc1) * (hnbc1 - pnbc1) /
853 hit1->GetHitForRecPtr()->GetNonBendingReso2());
858 delete covNonBending;
862 Double_t MultipleScatteringAngle2(AliMUONTrackHit *TrackHit)
864 // Returns square of multiple Coulomb scattering angle
865 // at TrackHit pointed to by "TrackHit"
866 Double_t slopeBending, slopeNonBending, radiationLength, inverseBendingMomentum2, inverseTotalMomentum2;
867 Double_t varMultipleScatteringAngle;
868 AliMUONTrack *trackBeingFitted = (AliMUONTrack*) AliMUONTrack::Fitter()->GetObjectFit();
869 AliMUONTrackParam *param = TrackHit->GetTrackParam();
870 // Better implementation in AliMUONTrack class ????
871 slopeBending = param->GetBendingSlope();
872 slopeNonBending = param->GetNonBendingSlope();
873 // thickness in radiation length for the current track,
874 // taking local angle into account
876 trackBeingFitted->GetTrackReconstructor()->GetChamberThicknessInX0() *
878 slopeBending * slopeBending + slopeNonBending * slopeNonBending);
879 inverseBendingMomentum2 =
880 param->GetInverseBendingMomentum() * param->GetInverseBendingMomentum();
881 inverseTotalMomentum2 =
882 inverseBendingMomentum2 * (1.0 + slopeBending * slopeBending) /
883 (1.0 + slopeBending *slopeBending + slopeNonBending * slopeNonBending);
884 varMultipleScatteringAngle = 0.0136 * (1.0 + 0.038 * TMath::Log(radiationLength));
885 // The velocity is assumed to be 1 !!!!
886 varMultipleScatteringAngle = inverseTotalMomentum2 * radiationLength *
887 varMultipleScatteringAngle * varMultipleScatteringAngle;
888 return varMultipleScatteringAngle;
891 //______________________________________________________________________________
892 void mnvertLocal(Double_t *a, Int_t l, Int_t, Int_t n, Int_t &ifail)
894 //*-*-*-*-*-*-*-*-*-*-*-*Inverts a symmetric matrix*-*-*-*-*-*-*-*-*-*-*-*-*
895 //*-* ==========================
896 //*-* inverts a symmetric matrix. matrix is first scaled to
897 //*-* have all ones on the diagonal (equivalent to change of units)
898 //*-* but no pivoting is done since matrix is positive-definite.
899 //*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*
901 // taken from TMinuit package of Root (l>=n)
902 // fVERTs, fVERTq and fVERTpp changed to localVERTs, localVERTq and localVERTpp
903 // Double_t localVERTs[n], localVERTq[n], localVERTpp[n];
904 Double_t * localVERTs = new Double_t[n];
905 Double_t * localVERTq = new Double_t[n];
906 Double_t * localVERTpp = new Double_t[n];
907 // fMaxint changed to localMaxint
908 Int_t localMaxint = n;
910 /* System generated locals */
913 /* Local variables */
915 Int_t i, j, k, kp1, km1;
917 /* Parameter adjustments */
923 if (n < 1) goto L100;
924 if (n > localMaxint) goto L100;
925 //*-*- scale matrix by sqrt of diag elements
926 for (i = 1; i <= n; ++i) {
928 if (si <= 0) goto L100;
929 localVERTs[i-1] = 1 / TMath::Sqrt(si);
931 for (i = 1; i <= n; ++i) {
932 for (j = 1; j <= n; ++j) {
933 a[i + j*l] = a[i + j*l]*localVERTs[i-1]*localVERTs[j-1];
936 //*-*- . . . start main loop . . . .
937 for (i = 1; i <= n; ++i) {
939 //*-*- preparation for elimination step1
940 if (a[k + k*l] != 0) localVERTq[k-1] = 1 / a[k + k*l];
942 localVERTpp[k-1] = 1;
946 if (km1 < 0) goto L100;
947 else if (km1 == 0) goto L50;
950 for (j = 1; j <= km1; ++j) {
951 localVERTpp[j-1] = a[j + k*l];
952 localVERTq[j-1] = a[j + k*l]*localVERTq[k-1];
956 if (k - n < 0) goto L51;
957 else if (k - n == 0) goto L60;
960 for (j = kp1; j <= n; ++j) {
961 localVERTpp[j-1] = a[k + j*l];
962 localVERTq[j-1] = -a[k + j*l]*localVERTq[k-1];
965 //*-*- elimination proper
967 for (j = 1; j <= n; ++j) {
968 for (k = j; k <= n; ++k) { a[j + k*l] += localVERTpp[j-1]*localVERTq[k-1]; }
971 //*-*- elements of left diagonal and unscaling
972 for (j = 1; j <= n; ++j) {
973 for (k = 1; k <= j; ++k) {
974 a[k + j*l] = a[k + j*l]*localVERTs[k-1]*localVERTs[j-1];
975 a[j + k*l] = a[k + j*l];
978 delete [] localVERTs;
979 delete [] localVERTq;
980 delete [] localVERTpp;
982 //*-*- failure return
984 delete [] localVERTs;
985 delete [] localVERTq;
986 delete [] localVERTpp;
990 //_____________________________________________-
991 void AliMUONTrack::Print(Option_t* opt) const
994 // Printing Track information
995 // "full" option for printing all the information about the track
1000 if ( sopt.Contains("FULL") ) {
1001 cout << "<AliMUONTrack> No.Clusters=" << setw(2) << GetNTrackHits() <<
1002 // ", Bending P="<< setw(8) << setprecision(5) << 1./GetInverseBendingMomentum() <<
1003 //", NonBendSlope=" << setw(8) << setprecision(5) << GetNonBendingSlope()*180./TMath::Pi() <<
1004 //", BendSlope=" << setw(8) << setprecision(5) << GetBendingSlope()*180./TMath::Pi() <<
1005 ", Match2Trig=" << setw(1) << GetMatchTrigger() <<
1006 ", Chi2-tracking-trigger=" << setw(8) << setprecision(5) << GetChi2MatchTrigger() << endl ;
1007 GetTrackParamAtHit()->First()->Print("full");
1010 cout << "<AliMUONTrack>";
1011 GetTrackParamAtHit()->First()->Print("");