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a9e2aefa | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, 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 | ||
88cb7938 | 16 | /* $Id$ */ |
a9e2aefa | 17 | |
3831f268 | 18 | /////////////////////////////////////////////////// |
a9e2aefa | 19 | // |
3831f268 | 20 | // Reconstructed track |
21 | // in | |
22 | // ALICE | |
23 | // dimuon | |
24 | // spectrometer | |
25 | // | |
26 | /////////////////////////////////////////////////// | |
a9e2aefa | 27 | |
82a4bc7b | 28 | #include <stdlib.h> // for exit() |
a9e2aefa | 29 | |
30178c30 | 30 | #include <Riostream.h> // for cout |
04b5ea16 | 31 | #include <TMath.h> |
d0bfce8d | 32 | #include <TMatrixD.h> |
8429a5e4 | 33 | #include <TObjArray.h> |
956019b6 | 34 | #include <TVirtualFitter.h> |
a9e2aefa | 35 | |
36 | #include "AliMUONEventReconstructor.h" | |
37 | #include "AliMUONHitForRec.h" | |
38 | #include "AliMUONSegment.h" | |
3831f268 | 39 | #include "AliMUONTrack.h" |
a9e2aefa | 40 | #include "AliMUONTrackHit.h" |
d837040f | 41 | #include "AliMUONTriggerTrack.h" |
42 | #include "AliMUONConstants.h" | |
a9e2aefa | 43 | |
04b5ea16 | 44 | // Functions to be minimized with Minuit |
a9e2aefa | 45 | void TrackChi2(Int_t &NParam, Double_t *Gradient, Double_t &Chi2, Double_t *Param, Int_t Flag); |
04b5ea16 | 46 | void TrackChi2MCS(Int_t &NParam, Double_t *Gradient, Double_t &Chi2, Double_t *Param, Int_t Flag); |
47 | ||
44f59652 | 48 | void mnvertLocal(Double_t* a, Int_t l, Int_t m, Int_t n, Int_t& ifail); |
49 | ||
04b5ea16 | 50 | Double_t MultipleScatteringAngle2(AliMUONTrackHit *TrackHit); |
a9e2aefa | 51 | |
52 | ClassImp(AliMUONTrack) // Class implementation in ROOT context | |
53 | ||
956019b6 | 54 | TVirtualFitter* AliMUONTrack::fgFitter = NULL; |
55 | ||
d837040f | 56 | //__________________________________________________________________________ |
30178c30 | 57 | AliMUONTrack::AliMUONTrack() |
58 | : TObject() | |
d837040f | 59 | { |
60 | // Default constructor | |
61 | fgFitter = 0; | |
62 | fEventReconstructor = 0; | |
e516b01d | 63 | fTrackHitsPtr = new TObjArray(10); |
d837040f | 64 | fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",10); |
b8dc484b | 65 | fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",10); |
66 | fTrackID = 0; | |
d837040f | 67 | } |
68 | ||
a9e2aefa | 69 | //__________________________________________________________________________ |
70 | AliMUONTrack::AliMUONTrack(AliMUONSegment* BegSegment, AliMUONSegment* EndSegment, AliMUONEventReconstructor* EventReconstructor) | |
30178c30 | 71 | : TObject() |
a9e2aefa | 72 | { |
73 | // Constructor from two Segment's | |
74 | fEventReconstructor = EventReconstructor; // link back to EventReconstructor | |
8429a5e4 | 75 | // memory allocation for the TObjArray of pointers to reconstructed TrackHit's |
76 | fTrackHitsPtr = new TObjArray(10); | |
a9e2aefa | 77 | fNTrackHits = 0; |
78 | AddSegment(BegSegment); // add hits from BegSegment | |
79 | AddSegment(EndSegment); // add hits from EndSegment | |
80 | fTrackHitsPtr->Sort(); // sort TrackHits according to increasing Z | |
81 | SetTrackParamAtVertex(); // set track parameters at vertex | |
d837040f | 82 | fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",10); |
b8dc484b | 83 | fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",10); |
8429a5e4 | 84 | // set fit conditions... |
04b5ea16 | 85 | fFitMCS = 0; |
956019b6 | 86 | fFitNParam = 3; |
87 | fFitStart = 1; | |
8429a5e4 | 88 | fFitFMin = -1.0; |
d837040f | 89 | fMatchTrigger = kFALSE; |
90 | fChi2MatchTrigger = 0; | |
b8dc484b | 91 | fTrackID = 0; |
a9e2aefa | 92 | return; |
93 | } | |
94 | ||
95 | //__________________________________________________________________________ | |
96 | AliMUONTrack::AliMUONTrack(AliMUONSegment* Segment, AliMUONHitForRec* HitForRec, AliMUONEventReconstructor* EventReconstructor) | |
30178c30 | 97 | : TObject() |
a9e2aefa | 98 | { |
99 | // Constructor from one Segment and one HitForRec | |
100 | fEventReconstructor = EventReconstructor; // link back to EventReconstructor | |
8429a5e4 | 101 | // memory allocation for the TObjArray of pointers to reconstructed TrackHit's |
102 | fTrackHitsPtr = new TObjArray(10); | |
a9e2aefa | 103 | fNTrackHits = 0; |
104 | AddSegment(Segment); // add hits from Segment | |
105 | AddHitForRec(HitForRec); // add HitForRec | |
106 | fTrackHitsPtr->Sort(); // sort TrackHits according to increasing Z | |
107 | SetTrackParamAtVertex(); // set track parameters at vertex | |
d837040f | 108 | fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",10); |
b8dc484b | 109 | fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",10); |
8429a5e4 | 110 | // set fit conditions... |
04b5ea16 | 111 | fFitMCS = 0; |
956019b6 | 112 | fFitNParam = 3; |
113 | fFitStart = 1; | |
8429a5e4 | 114 | fFitFMin = -1.0; |
d837040f | 115 | fMatchTrigger = kFALSE; |
116 | fChi2MatchTrigger = 0; | |
b8dc484b | 117 | fTrackID = 0; |
a9e2aefa | 118 | return; |
119 | } | |
120 | ||
8429a5e4 | 121 | //__________________________________________________________________________ |
122 | AliMUONTrack::~AliMUONTrack() | |
123 | { | |
124 | // Destructor | |
125 | if (fTrackHitsPtr) { | |
126 | delete fTrackHitsPtr; // delete the TObjArray of pointers to TrackHit's | |
127 | fTrackHitsPtr = NULL; | |
128 | } | |
d837040f | 129 | |
130 | if (fTrackParamAtHit) { | |
131 | // delete the TClonesArray of pointers to TrackParam | |
132 | delete fTrackParamAtHit; | |
133 | fTrackParamAtHit = NULL; | |
134 | } | |
b8dc484b | 135 | |
136 | if (fHitForRecAtHit) { | |
137 | // delete the TClonesArray of pointers to HitForRec | |
138 | delete fHitForRecAtHit; | |
139 | fHitForRecAtHit = NULL; | |
140 | } | |
8429a5e4 | 141 | } |
142 | ||
956019b6 | 143 | //__________________________________________________________________________ |
30178c30 | 144 | AliMUONTrack::AliMUONTrack (const AliMUONTrack& theMUONTrack) |
145 | : TObject(theMUONTrack) | |
a9e2aefa | 146 | { |
30178c30 | 147 | //fEventReconstructor = new AliMUONEventReconstructor(*MUONTrack.fEventReconstructor); |
148 | // is it right ? | |
149 | // NO, because it would use dummy copy constructor | |
150 | // and AliMUONTrack is not the owner of its EventReconstructor | |
151 | fEventReconstructor = theMUONTrack.fEventReconstructor; | |
152 | fTrackParamAtVertex = theMUONTrack.fTrackParamAtVertex; | |
e516b01d | 153 | |
154 | // necessary to make a copy of the objects and not only the pointers in TObjArray. | |
155 | fTrackHitsPtr = new TObjArray(10); | |
156 | for (Int_t index = 0; index < (theMUONTrack.fTrackHitsPtr)->GetEntriesFast(); index++) { | |
157 | AliMUONTrackHit *trackHit = new AliMUONTrackHit(*(AliMUONTrackHit*)(theMUONTrack.fTrackHitsPtr)->At(index)); | |
158 | fTrackHitsPtr->Add(trackHit); | |
159 | } | |
160 | ||
161 | // necessary to make a copy of the objects and not only the pointers in TClonesArray. | |
162 | fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",10); | |
163 | for (Int_t index = 0; index < (theMUONTrack.fTrackParamAtHit)->GetEntriesFast(); index++) { | |
164 | {new ((*fTrackParamAtHit)[fTrackParamAtHit->GetEntriesFast()]) | |
165 | AliMUONTrackParam(*(AliMUONTrackParam*)(theMUONTrack.fTrackParamAtHit)->At(index));} | |
166 | } | |
167 | ||
b8dc484b | 168 | // necessary to make a copy of the objects and not only the pointers in TClonesArray. |
169 | fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",10); | |
170 | for (Int_t index = 0; index < (theMUONTrack.fHitForRecAtHit)->GetEntriesFast(); index++) { | |
171 | {new ((*fHitForRecAtHit)[fHitForRecAtHit->GetEntriesFast()]) | |
172 | AliMUONHitForRec(*(AliMUONHitForRec*)(theMUONTrack.fHitForRecAtHit)->At(index));} | |
173 | } | |
174 | ||
30178c30 | 175 | fNTrackHits = theMUONTrack.fNTrackHits; |
176 | fFitMCS = theMUONTrack.fFitMCS; | |
177 | fFitNParam = theMUONTrack.fFitNParam; | |
178 | fFitFMin = theMUONTrack.fFitFMin; | |
179 | fFitStart = theMUONTrack.fFitStart; | |
180 | fMatchTrigger = theMUONTrack.fMatchTrigger; | |
181 | fChi2MatchTrigger = theMUONTrack.fChi2MatchTrigger; | |
b8dc484b | 182 | fTrackID = theMUONTrack.fTrackID; |
a9e2aefa | 183 | } |
184 | ||
956019b6 | 185 | //__________________________________________________________________________ |
30178c30 | 186 | AliMUONTrack & AliMUONTrack::operator=(const AliMUONTrack& theMUONTrack) |
a9e2aefa | 187 | { |
30178c30 | 188 | |
189 | // check assignement to self | |
190 | if (this == &theMUONTrack) | |
a9e2aefa | 191 | return *this; |
61adb9bd | 192 | |
30178c30 | 193 | // base class assignement |
194 | TObject::operator=(theMUONTrack); | |
195 | ||
196 | // fEventReconstructor = new AliMUONEventReconstructor(*MUONTrack.fEventReconstructor); // is it right ? | |
197 | // is it right ? NO because it would use dummy copy constructor | |
198 | fEventReconstructor = theMUONTrack.fEventReconstructor; | |
199 | fTrackParamAtVertex = theMUONTrack.fTrackParamAtVertex; | |
e516b01d | 200 | |
201 | // necessary to make a copy of the objects and not only the pointers in TObjArray. | |
202 | fTrackHitsPtr = new TObjArray(10); | |
203 | for (Int_t index = 0; index < (theMUONTrack.fTrackHitsPtr)->GetEntriesFast(); index++) { | |
204 | AliMUONTrackHit *trackHit = new AliMUONTrackHit(*(AliMUONTrackHit*)(theMUONTrack.fTrackHitsPtr)->At(index)); | |
205 | fTrackHitsPtr->Add(trackHit); | |
206 | } | |
207 | ||
208 | // necessary to make a copy of the objects and not only the pointers in TClonesArray. | |
209 | fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",10); | |
210 | for (Int_t index = 0; index < (theMUONTrack.fTrackParamAtHit)->GetEntriesFast(); index++) { | |
211 | {new ((*fTrackParamAtHit)[fTrackParamAtHit->GetEntriesFast()]) | |
212 | AliMUONTrackParam(*(AliMUONTrackParam*)(theMUONTrack.fTrackParamAtHit)->At(index));} | |
213 | } | |
214 | ||
b8dc484b | 215 | // necessary to make a copy of the objects and not only the pointers in TClonesArray. |
216 | fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",10); | |
217 | for (Int_t index = 0; index < (theMUONTrack.fHitForRecAtHit)->GetEntriesFast(); index++) { | |
218 | {new ((*fHitForRecAtHit)[fHitForRecAtHit->GetEntriesFast()]) | |
219 | AliMUONHitForRec(*(AliMUONHitForRec*)(theMUONTrack.fHitForRecAtHit)->At(index));} | |
220 | } | |
221 | ||
30178c30 | 222 | fNTrackHits = theMUONTrack.fNTrackHits; |
223 | fFitMCS = theMUONTrack.fFitMCS; | |
224 | fFitNParam = theMUONTrack.fFitNParam; | |
225 | fFitFMin = theMUONTrack.fFitFMin; | |
226 | fFitStart = theMUONTrack.fFitStart; | |
227 | fMatchTrigger = theMUONTrack.fMatchTrigger; | |
228 | fChi2MatchTrigger = theMUONTrack.fChi2MatchTrigger; | |
b8dc484b | 229 | fTrackID = theMUONTrack.fTrackID; |
30178c30 | 230 | |
61adb9bd | 231 | return *this; |
a9e2aefa | 232 | } |
233 | ||
8429a5e4 | 234 | //__________________________________________________________________________ |
235 | void AliMUONTrack::Remove() | |
236 | { | |
237 | // Remove current track from array of tracks, | |
238 | // and corresponding track hits from array of track hits. | |
239 | // Compress the TClonesArray it belongs to. | |
240 | AliMUONTrackHit *nextTrackHit; | |
241 | AliMUONEventReconstructor *eventRec = this->fEventReconstructor; | |
242 | TClonesArray *trackHitsPtr = eventRec->GetRecTrackHitsPtr(); | |
243 | // Loop over all track hits of track | |
244 | AliMUONTrackHit *trackHit = (AliMUONTrackHit*) fTrackHitsPtr->First(); | |
245 | while (trackHit) { | |
246 | nextTrackHit = (AliMUONTrackHit*) fTrackHitsPtr->After(trackHit); | |
247 | // Remove TrackHit from event TClonesArray. | |
248 | // Destructor is called, | |
249 | // hence links between HitForRec's and TrackHit's are updated | |
250 | trackHitsPtr->Remove(trackHit); | |
251 | trackHit = nextTrackHit; | |
252 | } | |
253 | // Remove the track from event TClonesArray | |
254 | // Destructor is called, | |
255 | // hence space for TObjArray of pointers to TrackHit's is freed | |
256 | eventRec->GetRecTracksPtr()->Remove(this); | |
257 | // Number of tracks decreased by 1 | |
258 | eventRec->SetNRecTracks(eventRec->GetNRecTracks() - 1); | |
259 | // Compress event TClonesArray of Track's: | |
260 | // this is essential to retrieve the TClonesArray afterwards | |
261 | eventRec->GetRecTracksPtr()->Compress(); | |
262 | // Compress event TClonesArray of TrackHit's: | |
263 | // this is probably also essential to retrieve the TClonesArray afterwards | |
264 | trackHitsPtr->Compress(); | |
265 | } | |
266 | ||
04b5ea16 | 267 | //__________________________________________________________________________ |
268 | void AliMUONTrack::SetFitMCS(Int_t FitMCS) | |
269 | { | |
956019b6 | 270 | // Set multiple Coulomb scattering option for track fit "fFitMCS" |
04b5ea16 | 271 | // from "FitMCS" argument: 0 without, 1 with |
956019b6 | 272 | if ((FitMCS == 0) || (FitMCS == 1)) fFitMCS = FitMCS; |
04b5ea16 | 273 | // better implementation with enum(with, without) ???? |
956019b6 | 274 | else { |
275 | cout << "ERROR in AliMUONTrack::SetFitMCS(FitMCS)" << endl; | |
276 | cout << "FitMCS = " << FitMCS << " is neither 0 nor 1" << endl; | |
277 | exit(0); | |
278 | } | |
279 | return; | |
280 | } | |
281 | ||
282 | //__________________________________________________________________________ | |
283 | void AliMUONTrack::SetFitNParam(Int_t FitNParam) | |
284 | { | |
285 | // Set number of parameters for track fit "fFitNParam" from "FitNParam": | |
286 | // 3 for momentum, 5 for momentum and position | |
287 | if ((FitNParam == 3) || (FitNParam == 5)) fFitNParam = FitNParam; | |
288 | else { | |
289 | cout << "ERROR in AliMUONTrack::SetFitNParam(FitNParam)" << endl; | |
290 | cout << "FitNParam = " << FitNParam << " is neither 3 nor 5" << endl; | |
291 | exit(0); | |
292 | } | |
293 | return; | |
294 | } | |
295 | ||
296 | //__________________________________________________________________________ | |
297 | void AliMUONTrack::SetFitStart(Int_t FitStart) | |
298 | { | |
299 | // Set multiple Coulomb scattering option for track fit "fFitStart" | |
300 | // from "FitStart" argument: 0 without, 1 with | |
301 | if ((FitStart == 0) || (FitStart == 1)) fFitStart = FitStart; | |
302 | // better implementation with enum(vertex, firstHit) ???? | |
303 | else { | |
304 | cout << "ERROR in AliMUONTrack::SetFitStart(FitStart)" << endl; | |
305 | cout << "FitStart = " << FitStart << " is neither 0 nor 1" << endl; | |
306 | exit(0); | |
307 | } | |
04b5ea16 | 308 | return; |
309 | } | |
310 | ||
956019b6 | 311 | //__________________________________________________________________________ |
3831f268 | 312 | AliMUONTrackParam* AliMUONTrack::GetTrackParamAtFirstHit(void) const { |
a9e2aefa | 313 | // Get pointer to TrackParamAtFirstHit |
314 | return ((AliMUONTrackHit*) (fTrackHitsPtr->First()))->GetTrackParam();} | |
a9e2aefa | 315 | |
316 | //__________________________________________________________________________ | |
3831f268 | 317 | void AliMUONTrack::RecursiveDump(void) const |
a9e2aefa | 318 | { |
319 | // Recursive dump of AliMUONTrack, i.e. with dump of TrackHit's and HitForRec's | |
320 | AliMUONTrackHit *trackHit; | |
321 | AliMUONHitForRec *hitForRec; | |
322 | cout << "Recursive dump of Track: " << this << endl; | |
323 | // Track | |
324 | this->Dump(); | |
325 | for (Int_t trackHitIndex = 0; trackHitIndex < fNTrackHits; trackHitIndex++) { | |
326 | trackHit = (AliMUONTrackHit*) ((*fTrackHitsPtr)[trackHitIndex]); | |
327 | // TrackHit | |
328 | cout << "TrackHit: " << trackHit << " (index: " << trackHitIndex << ")" << endl; | |
329 | trackHit->Dump(); | |
330 | hitForRec = trackHit->GetHitForRecPtr(); | |
331 | // HitForRec | |
332 | cout << "HitForRec: " << hitForRec << endl; | |
333 | hitForRec->Dump(); | |
334 | } | |
335 | return; | |
336 | } | |
b8dc484b | 337 | |
338 | //__________________________________________________________________________ | |
339 | Bool_t* AliMUONTrack::CompatibleTrack(AliMUONTrack * Track, Double_t Sigma2Cut) const | |
340 | { | |
341 | // Return kTRUE/kFALSE for each chamber if hit is compatible or not | |
342 | TClonesArray *hitArray, *thisHitArray; | |
343 | AliMUONHitForRec *hit, *thisHit; | |
344 | Int_t chamberNumber; | |
345 | Float_t deltaZ; | |
346 | Float_t deltaZMax = 1.; // 1 cm | |
347 | Float_t chi2 = 0; | |
348 | Bool_t *nCompHit = new Bool_t[AliMUONConstants::NTrackingCh()]; | |
349 | ||
350 | for ( Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) { | |
351 | nCompHit[ch] = kFALSE; | |
352 | } | |
353 | ||
354 | thisHitArray = this->GetHitForRecAtHit(); | |
355 | ||
356 | hitArray = Track->GetHitForRecAtHit(); | |
357 | ||
358 | for (Int_t iHthis = 0; iHthis < thisHitArray->GetEntriesFast(); iHthis++) { | |
359 | thisHit = (AliMUONHitForRec*) thisHitArray->At(iHthis); | |
360 | chamberNumber = thisHit->GetChamberNumber(); | |
361 | if (chamberNumber < 0 || chamberNumber > AliMUONConstants::NTrackingCh()) continue; | |
362 | nCompHit[chamberNumber] = kFALSE; | |
363 | for (Int_t iH = 0; iH < hitArray->GetEntriesFast(); iH++) { | |
364 | hit = (AliMUONHitForRec*) hitArray->At(iH); | |
365 | deltaZ = TMath::Abs(thisHit->GetZ() - hit->GetZ()); | |
366 | chi2 = thisHit->NormalizedChi2WithHitForRec(hit,Sigma2Cut); // set cut to 4 sigmas | |
367 | if (chi2 < 3. && deltaZ < deltaZMax) { | |
368 | nCompHit[chamberNumber] = kTRUE; | |
369 | break; | |
370 | } | |
371 | } | |
372 | } | |
373 | ||
374 | return nCompHit; | |
375 | } | |
a9e2aefa | 376 | |
8429a5e4 | 377 | //__________________________________________________________________________ |
30178c30 | 378 | Int_t AliMUONTrack::HitsInCommon(AliMUONTrack* Track) const |
8429a5e4 | 379 | { |
380 | // Returns the number of hits in common | |
381 | // between the current track ("this") | |
382 | // and the track pointed to by "Track". | |
383 | Int_t hitsInCommon = 0; | |
384 | AliMUONTrackHit *trackHit1, *trackHit2; | |
385 | // Loop over hits of first track | |
386 | trackHit1 = (AliMUONTrackHit*) this->GetTrackHitsPtr()->First(); | |
387 | while (trackHit1) { | |
388 | // Loop over hits of second track | |
389 | trackHit2 = (AliMUONTrackHit*) Track->GetTrackHitsPtr()->First(); | |
390 | while (trackHit2) { | |
391 | // Increment "hitsInCommon" if both TrackHits point to the same HitForRec | |
392 | if ( (trackHit1->GetHitForRecPtr()) == | |
393 | (trackHit2->GetHitForRecPtr()) ) hitsInCommon++; | |
394 | trackHit2 = (AliMUONTrackHit*) Track->GetTrackHitsPtr()->After(trackHit2); | |
395 | } // trackHit2 | |
396 | trackHit1 = (AliMUONTrackHit*) this->GetTrackHitsPtr()->After(trackHit1); | |
397 | } // trackHit1 | |
398 | return hitsInCommon; | |
399 | } | |
400 | ||
d837040f | 401 | //__________________________________________________________________________ |
402 | void AliMUONTrack::MatchTriggerTrack(TClonesArray *triggerTrackArray) | |
403 | { | |
404 | // Match this track with one trigger track if possible | |
2c3dd8cd | 405 | AliMUONTrackParam trackParam; |
d837040f | 406 | AliMUONTriggerTrack *triggerTrack; |
407 | Double_t xTrack, yTrack, ySlopeTrack, dTrigTrackMin2, dTrigTrack2; | |
408 | Double_t nSigmaCut2; | |
409 | ||
410 | Double_t distSigma[3]={1,1,0.02}; // sigma of distributions (trigger-track) X,Y,slopeY | |
411 | Double_t distTriggerTrack[3] = {0,0,0}; | |
412 | ||
413 | fMatchTrigger = kFALSE; | |
414 | fChi2MatchTrigger = 0; | |
415 | ||
2c3dd8cd | 416 | trackParam = *((AliMUONTrackParam*) fTrackParamAtHit->Last()); |
417 | trackParam.ExtrapToZ(AliMUONConstants::DefaultChamberZ(10)); // extrap to 1st trigger chamber | |
d837040f | 418 | |
419 | nSigmaCut2 = fEventReconstructor->GetMaxSigma2Distance(); // nb of sigma**2 for cut | |
2c3dd8cd | 420 | xTrack = trackParam.GetNonBendingCoor(); |
421 | yTrack = trackParam.GetBendingCoor(); | |
422 | ySlopeTrack = trackParam.GetBendingSlope(); | |
d837040f | 423 | dTrigTrackMin2 = 999; |
424 | ||
425 | triggerTrack = (AliMUONTriggerTrack*) triggerTrackArray->First(); | |
426 | while(triggerTrack){ | |
427 | distTriggerTrack[0] = (triggerTrack->GetX11()-xTrack)/distSigma[0]; | |
428 | distTriggerTrack[1] = (triggerTrack->GetY11()-yTrack)/distSigma[1]; | |
429 | distTriggerTrack[2] = (TMath::Tan(triggerTrack->GetThetay())-ySlopeTrack)/distSigma[2]; | |
430 | dTrigTrack2 = 0; | |
431 | for (Int_t iVar = 0; iVar < 3; iVar++) | |
432 | dTrigTrack2 += distTriggerTrack[iVar]*distTriggerTrack[iVar]; | |
433 | if (dTrigTrack2 < dTrigTrackMin2 && dTrigTrack2 < nSigmaCut2) { | |
434 | dTrigTrackMin2 = dTrigTrack2; | |
435 | fMatchTrigger = kTRUE; | |
436 | fChi2MatchTrigger = dTrigTrack2/3.; // Normalized Chi2, 3 variables (X,Y,slopeY) | |
437 | } | |
438 | triggerTrack = (AliMUONTriggerTrack*) triggerTrackArray->After(triggerTrack); | |
439 | } | |
440 | ||
441 | } | |
a9e2aefa | 442 | //__________________________________________________________________________ |
956019b6 | 443 | void AliMUONTrack::Fit() |
a9e2aefa | 444 | { |
445 | // Fit the current track ("this"), | |
956019b6 | 446 | // with or without multiple Coulomb scattering according to "fFitMCS", |
447 | // with the number of parameters given by "fFitNParam" | |
448 | // (3 if one keeps X and Y fixed in "TrackParam", 5 if one lets them vary), | |
449 | // starting, according to "fFitStart", | |
450 | // with track parameters at vertex or at the first TrackHit. | |
451 | // "fFitMCS", "fFitNParam" and "fFitStart" have to be set before | |
452 | // by calling the corresponding Set methods. | |
a9e2aefa | 453 | Double_t arg[1], benC, errorParam, invBenP, lower, nonBenC, upper, x, y; |
956019b6 | 454 | char parName[50]; |
455 | AliMUONTrackParam *trackParam; | |
456 | // Check if Minuit is initialized... | |
457 | fgFitter = TVirtualFitter::Fitter(this); // add 3 or 5 for the maximum number of parameters ??? | |
458 | fgFitter->Clear(); // necessary ???? probably yes | |
459 | // how to reset the printout number at every fit ???? | |
460 | // is there any risk to leave it like that ???? | |
a9e2aefa | 461 | // how to go faster ???? choice of Minuit parameters like EDM ???? |
04b5ea16 | 462 | // choice of function to be minimized according to fFitMCS |
956019b6 | 463 | if (fFitMCS == 0) fgFitter->SetFCN(TrackChi2); |
464 | else fgFitter->SetFCN(TrackChi2MCS); | |
3a416225 | 465 | // Switch off printout |
d0bfce8d | 466 | arg[0] = -1; |
956019b6 | 467 | fgFitter->ExecuteCommand("SET PRINT", arg, 1); // More printing !!!! |
19dd5b2f | 468 | // No warnings |
469 | fgFitter->ExecuteCommand("SET NOW", arg, 0); | |
956019b6 | 470 | // Parameters according to "fFitStart" |
471 | // (should be a function to be used at every place where needed ????) | |
472 | if (fFitStart == 0) trackParam = &fTrackParamAtVertex; | |
473 | else trackParam = this->GetTrackParamAtFirstHit(); | |
474 | // set first 3 Minuit parameters | |
04b5ea16 | 475 | // could be tried with no limits for the search (min=max=0) ???? |
956019b6 | 476 | fgFitter->SetParameter(0, "InvBenP", |
477 | trackParam->GetInverseBendingMomentum(), | |
478 | 0.003, -0.4, 0.4); | |
479 | fgFitter->SetParameter(1, "BenS", | |
480 | trackParam->GetBendingSlope(), | |
481 | 0.001, -0.5, 0.5); | |
482 | fgFitter->SetParameter(2, "NonBenS", | |
483 | trackParam->GetNonBendingSlope(), | |
484 | 0.001, -0.5, 0.5); | |
485 | if (fFitNParam == 5) { | |
d0bfce8d | 486 | // set last 2 Minuit parameters |
487 | // mandatory limits in Bending to avoid NaN values of parameters | |
956019b6 | 488 | fgFitter->SetParameter(3, "X", |
489 | trackParam->GetNonBendingCoor(), | |
d0bfce8d | 490 | 0.03, -500.0, 500.0); |
491 | // mandatory limits in non Bending to avoid NaN values of parameters | |
956019b6 | 492 | fgFitter->SetParameter(4, "Y", |
493 | trackParam->GetBendingCoor(), | |
d0bfce8d | 494 | 0.10, -500.0, 500.0); |
a9e2aefa | 495 | } |
496 | // search without gradient calculation in the function | |
956019b6 | 497 | fgFitter->ExecuteCommand("SET NOGRADIENT", arg, 0); |
a9e2aefa | 498 | // minimization |
956019b6 | 499 | fgFitter->ExecuteCommand("MINIMIZE", arg, 0); |
a9e2aefa | 500 | // exit from Minuit |
17235410 | 501 | // fgFitter->ExecuteCommand("EXIT", arg, 0); // necessary ???? |
956019b6 | 502 | // get results into "invBenP", "benC", "nonBenC" ("x", "y") |
503 | fgFitter->GetParameter(0, parName, invBenP, errorParam, lower, upper); | |
504 | fgFitter->GetParameter(1, parName, benC, errorParam, lower, upper); | |
505 | fgFitter->GetParameter(2, parName, nonBenC, errorParam, lower, upper); | |
506 | if (fFitNParam == 5) { | |
507 | fgFitter->GetParameter(3, parName, x, errorParam, lower, upper); | |
508 | fgFitter->GetParameter(4, parName, y, errorParam, lower, upper); | |
a9e2aefa | 509 | } |
510 | // result of the fit into track parameters | |
956019b6 | 511 | trackParam->SetInverseBendingMomentum(invBenP); |
512 | trackParam->SetBendingSlope(benC); | |
513 | trackParam->SetNonBendingSlope(nonBenC); | |
514 | if (fFitNParam == 5) { | |
515 | trackParam->SetNonBendingCoor(x); | |
516 | trackParam->SetBendingCoor(y); | |
a9e2aefa | 517 | } |
8429a5e4 | 518 | // global result of the fit |
519 | Double_t fedm, errdef; | |
520 | Int_t npari, nparx; | |
521 | fgFitter->GetStats(fFitFMin, fedm, errdef, npari, nparx); | |
a9e2aefa | 522 | } |
523 | ||
524 | //__________________________________________________________________________ | |
525 | void AliMUONTrack::AddSegment(AliMUONSegment* Segment) | |
526 | { | |
8429a5e4 | 527 | // Add Segment to the track |
a9e2aefa | 528 | AddHitForRec(Segment->GetHitForRec1()); // 1st hit |
529 | AddHitForRec(Segment->GetHitForRec2()); // 2nd hit | |
530 | } | |
531 | ||
532 | //__________________________________________________________________________ | |
533 | void AliMUONTrack::AddHitForRec(AliMUONHitForRec* HitForRec) | |
534 | { | |
8429a5e4 | 535 | // Add HitForRec to the track: |
536 | // actual TrackHit into TClonesArray of TrackHit's for the event; | |
537 | // pointer to actual TrackHit in TObjArray of pointers to TrackHit's for the track | |
538 | TClonesArray *recTrackHitsPtr = this->fEventReconstructor->GetRecTrackHitsPtr(); | |
539 | Int_t eventTrackHits = this->fEventReconstructor->GetNRecTrackHits(); | |
540 | // event | |
541 | AliMUONTrackHit* trackHit = | |
542 | new ((*recTrackHitsPtr)[eventTrackHits]) AliMUONTrackHit(HitForRec); | |
543 | this->fEventReconstructor->SetNRecTrackHits(eventTrackHits + 1); | |
544 | // track | |
545 | fTrackHitsPtr->Add(trackHit); | |
a9e2aefa | 546 | fNTrackHits++; |
547 | } | |
548 | ||
549 | //__________________________________________________________________________ | |
3831f268 | 550 | void AliMUONTrack::SetTrackParamAtHit(Int_t indexHit, AliMUONTrackParam *TrackParam) const |
a9e2aefa | 551 | { |
552 | // Set track parameters at TrackHit with index "indexHit" | |
553 | // from the track parameters pointed to by "TrackParam". | |
2682e810 | 554 | //PH AliMUONTrackHit* trackHit = (AliMUONTrackHit*) ((*fTrackHitsPtr)[indexHit]); |
555 | AliMUONTrackHit* trackHit = (AliMUONTrackHit*) (fTrackHitsPtr->At(indexHit)); | |
a9e2aefa | 556 | trackHit->SetTrackParam(TrackParam); |
557 | } | |
558 | ||
559 | //__________________________________________________________________________ | |
560 | void AliMUONTrack::SetTrackParamAtVertex() | |
561 | { | |
562 | // Set track parameters at vertex. | |
563 | // TrackHit's are assumed to be only in stations(1..) 4 and 5, | |
564 | // and sorted according to increasing Z.. | |
565 | // Parameters are calculated from information in HitForRec's | |
566 | // of first and last TrackHit's. | |
567 | AliMUONTrackParam *trackParam = | |
568 | &fTrackParamAtVertex; // pointer to track parameters | |
569 | // Pointer to HitForRec of first TrackHit | |
570 | AliMUONHitForRec *firstHit = | |
571 | ((AliMUONTrackHit*) (fTrackHitsPtr->First()))->GetHitForRecPtr(); | |
572 | // Pointer to HitForRec of last TrackHit | |
573 | AliMUONHitForRec *lastHit = | |
574 | ((AliMUONTrackHit*) (fTrackHitsPtr->Last()))->GetHitForRecPtr(); | |
575 | // Z difference between first and last hits | |
576 | Double_t deltaZ = firstHit->GetZ() - lastHit->GetZ(); | |
577 | // bending slope in stations(1..) 4 and 5 | |
578 | Double_t bendingSlope = | |
579 | (firstHit->GetBendingCoor() - lastHit->GetBendingCoor()) / deltaZ; | |
580 | trackParam->SetBendingSlope(bendingSlope); | |
581 | // impact parameter | |
582 | Double_t impactParam = | |
583 | firstHit->GetBendingCoor() - bendingSlope * firstHit->GetZ(); // same if from firstHit and lastHit ???? | |
584 | // signed bending momentum | |
585 | Double_t signedBendingMomentum = | |
586 | fEventReconstructor->GetBendingMomentumFromImpactParam(impactParam); | |
587 | trackParam->SetInverseBendingMomentum(1.0 / signedBendingMomentum); | |
588 | // bending slope at vertex | |
589 | trackParam-> | |
590 | SetBendingSlope(bendingSlope + | |
591 | impactParam / fEventReconstructor->GetSimpleBPosition()); | |
592 | // non bending slope | |
593 | Double_t nonBendingSlope = | |
594 | (firstHit->GetNonBendingCoor() - lastHit->GetNonBendingCoor()) / deltaZ; | |
595 | trackParam->SetNonBendingSlope(nonBendingSlope); | |
596 | // vertex coordinates at (0,0,0) | |
597 | trackParam->SetZ(0.0); | |
598 | trackParam->SetBendingCoor(0.0); | |
599 | trackParam->SetNonBendingCoor(0.0); | |
600 | } | |
601 | ||
602 | //__________________________________________________________________________ | |
d9a3473d | 603 | void TrackChi2(Int_t &NParam, Double_t * /*Gradient*/, Double_t &Chi2, Double_t *Param, Int_t /*Flag*/) |
a9e2aefa | 604 | { |
605 | // Return the "Chi2" to be minimized with Minuit for track fitting, | |
606 | // with "NParam" parameters | |
607 | // and their current values in array pointed to by "Param". | |
608 | // Assumes that the track hits are sorted according to increasing Z. | |
609 | // Track parameters at each TrackHit are updated accordingly. | |
04b5ea16 | 610 | // Multiple Coulomb scattering is not taken into account |
956019b6 | 611 | AliMUONTrack *trackBeingFitted; |
a9e2aefa | 612 | AliMUONTrackHit* hit; |
613 | AliMUONTrackParam param1; | |
614 | Int_t hitNumber; | |
615 | Double_t zHit; | |
616 | Chi2 = 0.0; // initialize Chi2 | |
617 | // copy of track parameters to be fitted | |
956019b6 | 618 | trackBeingFitted = (AliMUONTrack*) AliMUONTrack::Fitter()->GetObjectFit(); |
619 | if (trackBeingFitted->GetFitStart() == 0) | |
620 | param1 = *(trackBeingFitted->GetTrackParamAtVertex()); | |
621 | else param1 = *(trackBeingFitted->GetTrackParamAtFirstHit()); | |
a9e2aefa | 622 | // Minuit parameters to be fitted into this copy |
623 | param1.SetInverseBendingMomentum(Param[0]); | |
624 | param1.SetBendingSlope(Param[1]); | |
625 | param1.SetNonBendingSlope(Param[2]); | |
626 | if (NParam == 5) { | |
627 | param1.SetNonBendingCoor(Param[3]); | |
628 | param1.SetBendingCoor(Param[4]); | |
629 | } | |
630 | // Follow track through all planes of track hits | |
631 | for (hitNumber = 0; hitNumber < trackBeingFitted->GetNTrackHits(); hitNumber++) { | |
632 | hit = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber]; | |
633 | zHit = hit->GetHitForRecPtr()->GetZ(); | |
634 | // do something special if 2 hits with same Z ???? | |
635 | // security against infinite loop ???? | |
636 | (¶m1)->ExtrapToZ(zHit); // extrapolation | |
637 | hit->SetTrackParam(¶m1); | |
638 | // Increment Chi2 | |
639 | // done hit per hit, with hit resolution, | |
640 | // and not with point and angle like in "reco_muon.F" !!!! | |
641 | // Needs to add multiple scattering contribution ???? | |
642 | Double_t dX = | |
643 | hit->GetHitForRecPtr()->GetNonBendingCoor() - (¶m1)->GetNonBendingCoor(); | |
644 | Double_t dY = | |
645 | hit->GetHitForRecPtr()->GetBendingCoor() - (¶m1)->GetBendingCoor(); | |
646 | Chi2 = | |
647 | Chi2 + | |
648 | dX * dX / hit->GetHitForRecPtr()->GetNonBendingReso2() + | |
649 | dY * dY / hit->GetHitForRecPtr()->GetBendingReso2(); | |
650 | } | |
651 | } | |
04b5ea16 | 652 | |
653 | //__________________________________________________________________________ | |
d9a3473d | 654 | void TrackChi2MCS(Int_t &NParam, Double_t * /*Gradient*/, Double_t &Chi2, Double_t *Param, Int_t /*Flag*/) |
04b5ea16 | 655 | { |
656 | // Return the "Chi2" to be minimized with Minuit for track fitting, | |
657 | // with "NParam" parameters | |
658 | // and their current values in array pointed to by "Param". | |
659 | // Assumes that the track hits are sorted according to increasing Z. | |
660 | // Track parameters at each TrackHit are updated accordingly. | |
661 | // Multiple Coulomb scattering is taken into account with covariance matrix. | |
956019b6 | 662 | AliMUONTrack *trackBeingFitted; |
04b5ea16 | 663 | AliMUONTrackParam param1; |
664 | Chi2 = 0.0; // initialize Chi2 | |
665 | // copy of track parameters to be fitted | |
956019b6 | 666 | trackBeingFitted = (AliMUONTrack*) AliMUONTrack::Fitter()->GetObjectFit(); |
667 | if (trackBeingFitted->GetFitStart() == 0) | |
668 | param1 = *(trackBeingFitted->GetTrackParamAtVertex()); | |
669 | else param1 = *(trackBeingFitted->GetTrackParamAtFirstHit()); | |
04b5ea16 | 670 | // Minuit parameters to be fitted into this copy |
671 | param1.SetInverseBendingMomentum(Param[0]); | |
672 | param1.SetBendingSlope(Param[1]); | |
673 | param1.SetNonBendingSlope(Param[2]); | |
674 | if (NParam == 5) { | |
675 | param1.SetNonBendingCoor(Param[3]); | |
676 | param1.SetBendingCoor(Param[4]); | |
677 | } | |
678 | ||
956019b6 | 679 | AliMUONTrackHit *hit; |
bbe35c23 | 680 | Int_t chCurrent, chPrev = 0, hitNumber, hitNumber1, hitNumber2, hitNumber3; |
eb9c9dab | 681 | Double_t z, z1, z2, z3; |
682 | AliMUONTrackHit *hit1, *hit2, *hit3; | |
683 | Double_t hbc1, hbc2, pbc1, pbc2; | |
684 | Double_t hnbc1, hnbc2, pnbc1, pnbc2; | |
685 | Int_t numberOfHit = trackBeingFitted->GetNTrackHits(); | |
d0bfce8d | 686 | TMatrixD *covBending = new TMatrixD(numberOfHit, numberOfHit); |
687 | TMatrixD *covNonBending = new TMatrixD(numberOfHit, numberOfHit); | |
eb9c9dab | 688 | Double_t *msa2 = new Double_t[numberOfHit]; |
04b5ea16 | 689 | |
690 | // Predicted coordinates and multiple scattering angles are first calculated | |
691 | for (hitNumber = 0; hitNumber < numberOfHit; hitNumber++) { | |
692 | hit = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber]; | |
eb9c9dab | 693 | z = hit->GetHitForRecPtr()->GetZ(); |
04b5ea16 | 694 | // do something special if 2 hits with same Z ???? |
695 | // security against infinite loop ???? | |
eb9c9dab | 696 | (¶m1)->ExtrapToZ(z); // extrapolation |
04b5ea16 | 697 | hit->SetTrackParam(¶m1); |
eb9c9dab | 698 | // square of multiple scattering angle at current hit, with one chamber |
699 | msa2[hitNumber] = MultipleScatteringAngle2(hit); | |
700 | // correction for eventual missing hits or multiple hits in a chamber, | |
701 | // according to the number of chambers | |
702 | // between the current hit and the previous one | |
703 | chCurrent = hit->GetHitForRecPtr()->GetChamberNumber(); | |
704 | if (hitNumber > 0) msa2[hitNumber] = msa2[hitNumber] * (chCurrent - chPrev); | |
705 | chPrev = chCurrent; | |
04b5ea16 | 706 | } |
707 | ||
708 | // Calculates the covariance matrix | |
eb9c9dab | 709 | for (hitNumber1 = 0; hitNumber1 < numberOfHit; hitNumber1++) { |
710 | hit1 = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber1]; | |
711 | z1 = hit1->GetHitForRecPtr()->GetZ(); | |
04b5ea16 | 712 | for (hitNumber2 = hitNumber1; hitNumber2 < numberOfHit; hitNumber2++) { |
eb9c9dab | 713 | hit2 = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber2]; |
714 | z2 = hit2->GetHitForRecPtr()->GetZ(); | |
956019b6 | 715 | // initialization to 0 (diagonal plus upper triangular part) |
716 | (*covBending)(hitNumber2, hitNumber1) = 0.0; | |
717 | // contribution from multiple scattering in bending plane: | |
718 | // loop over upstream hits | |
719 | for (hitNumber3 = 0; hitNumber3 < hitNumber1; hitNumber3++) { | |
eb9c9dab | 720 | hit3 = (AliMUONTrackHit*) |
721 | (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber3]; | |
722 | z3 = hit3->GetHitForRecPtr()->GetZ(); | |
04b5ea16 | 723 | (*covBending)(hitNumber2, hitNumber1) = |
724 | (*covBending)(hitNumber2, hitNumber1) + | |
eb9c9dab | 725 | ((z1 - z3) * (z2 - z3) * msa2[hitNumber3]); |
956019b6 | 726 | } |
727 | // equal contribution from multiple scattering in non bending plane | |
04b5ea16 | 728 | (*covNonBending)(hitNumber2, hitNumber1) = |
729 | (*covBending)(hitNumber2, hitNumber1); | |
956019b6 | 730 | if (hitNumber1 == hitNumber2) { |
731 | // Diagonal elements: add contribution from position measurements | |
732 | // in bending plane | |
733 | (*covBending)(hitNumber2, hitNumber1) = | |
eb9c9dab | 734 | (*covBending)(hitNumber2, hitNumber1) + |
735 | hit1->GetHitForRecPtr()->GetBendingReso2(); | |
956019b6 | 736 | // and in non bending plane |
04b5ea16 | 737 | (*covNonBending)(hitNumber2, hitNumber1) = |
eb9c9dab | 738 | (*covNonBending)(hitNumber2, hitNumber1) + |
739 | hit1->GetHitForRecPtr()->GetNonBendingReso2(); | |
956019b6 | 740 | } |
741 | else { | |
742 | // Non diagonal elements: symmetrization | |
743 | // for bending plane | |
744 | (*covBending)(hitNumber1, hitNumber2) = | |
745 | (*covBending)(hitNumber2, hitNumber1); | |
746 | // and non bending plane | |
747 | (*covNonBending)(hitNumber1, hitNumber2) = | |
748 | (*covNonBending)(hitNumber2, hitNumber1); | |
749 | } | |
750 | } // for (hitNumber2 = hitNumber1;... | |
751 | } // for (hitNumber1 = 0;... | |
d0bfce8d | 752 | |
44f59652 | 753 | // Inversion of covariance matrices |
754 | // with "mnvertLocal", local "mnvert" function of Minuit. | |
755 | // One cannot use directly "mnvert" since "TVirtualFitter" does not know it. | |
756 | // One will have to replace this local function by the right inversion function | |
757 | // from a specialized Root package for symmetric positive definite matrices, | |
758 | // when available!!!! | |
759 | Int_t ifailBending; | |
760 | mnvertLocal(&((*covBending)(0,0)), numberOfHit, numberOfHit, numberOfHit, | |
761 | ifailBending); | |
762 | Int_t ifailNonBending; | |
763 | mnvertLocal(&((*covNonBending)(0,0)), numberOfHit, numberOfHit, numberOfHit, | |
764 | ifailNonBending); | |
956019b6 | 765 | |
766 | // It would be worth trying to calculate the inverse of the covariance matrix | |
767 | // only once per fit, since it cannot change much in principle, | |
768 | // and it would save a lot of computing time !!!! | |
04b5ea16 | 769 | |
770 | // Calculates Chi2 | |
44f59652 | 771 | if ((ifailBending == 0) && (ifailNonBending == 0)) { |
eb9c9dab | 772 | // with Multiple Scattering if inversion correct |
773 | for (hitNumber1 = 0; hitNumber1 < numberOfHit ; hitNumber1++) { | |
774 | hit1 = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber1]; | |
775 | hbc1 = hit1->GetHitForRecPtr()->GetBendingCoor(); | |
776 | pbc1 = hit1->GetTrackParam()->GetBendingCoor(); | |
777 | hnbc1 = hit1->GetHitForRecPtr()->GetNonBendingCoor(); | |
778 | pnbc1 = hit1->GetTrackParam()->GetNonBendingCoor(); | |
779 | for (hitNumber2 = 0; hitNumber2 < numberOfHit; hitNumber2++) { | |
780 | hit2 = (AliMUONTrackHit*) | |
781 | (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber2]; | |
782 | hbc2 = hit2->GetHitForRecPtr()->GetBendingCoor(); | |
783 | pbc2 = hit2->GetTrackParam()->GetBendingCoor(); | |
784 | hnbc2 = hit2->GetHitForRecPtr()->GetNonBendingCoor(); | |
785 | pnbc2 = hit2->GetTrackParam()->GetNonBendingCoor(); | |
04b5ea16 | 786 | Chi2 = Chi2 + |
eb9c9dab | 787 | ((*covBending)(hitNumber2, hitNumber1) * |
788 | (hbc1 - pbc1) * (hbc2 - pbc2)) + | |
04b5ea16 | 789 | ((*covNonBending)(hitNumber2, hitNumber1) * |
eb9c9dab | 790 | (hnbc1 - pnbc1) * (hnbc2 - pnbc2)); |
04b5ea16 | 791 | } |
792 | } | |
eb9c9dab | 793 | } else { |
794 | // without Multiple Scattering if inversion impossible | |
795 | for (hitNumber1 = 0; hitNumber1 < numberOfHit ; hitNumber1++) { | |
796 | hit1 = (AliMUONTrackHit*) (*(trackBeingFitted->GetTrackHitsPtr()))[hitNumber1]; | |
797 | hbc1 = hit1->GetHitForRecPtr()->GetBendingCoor(); | |
798 | pbc1 = hit1->GetTrackParam()->GetBendingCoor(); | |
799 | hnbc1 = hit1->GetHitForRecPtr()->GetNonBendingCoor(); | |
800 | pnbc1 = hit1->GetTrackParam()->GetNonBendingCoor(); | |
801 | Chi2 = Chi2 + | |
802 | ((hbc1 - pbc1) * (hbc1 - pbc1) / | |
803 | hit1->GetHitForRecPtr()->GetBendingReso2()) + | |
804 | ((hnbc1 - pnbc1) * (hnbc1 - pnbc1) / | |
805 | hit1->GetHitForRecPtr()->GetNonBendingReso2()); | |
04b5ea16 | 806 | } |
807 | } | |
808 | ||
809 | delete covBending; | |
810 | delete covNonBending; | |
eb9c9dab | 811 | delete [] msa2; |
04b5ea16 | 812 | } |
813 | ||
814 | Double_t MultipleScatteringAngle2(AliMUONTrackHit *TrackHit) | |
815 | { | |
816 | // Returns square of multiple Coulomb scattering angle | |
817 | // at TrackHit pointed to by "TrackHit" | |
818 | Double_t slopeBending, slopeNonBending, radiationLength, inverseBendingMomentum2, inverseTotalMomentum2; | |
819 | Double_t varMultipleScatteringAngle; | |
956019b6 | 820 | AliMUONTrack *trackBeingFitted = (AliMUONTrack*) AliMUONTrack::Fitter()->GetObjectFit(); |
04b5ea16 | 821 | AliMUONTrackParam *param = TrackHit->GetTrackParam(); |
956019b6 | 822 | // Better implementation in AliMUONTrack class ???? |
04b5ea16 | 823 | slopeBending = param->GetBendingSlope(); |
824 | slopeNonBending = param->GetNonBendingSlope(); | |
825 | // thickness in radiation length for the current track, | |
826 | // taking local angle into account | |
827 | radiationLength = | |
828 | trackBeingFitted->GetEventReconstructor()->GetChamberThicknessInX0() * | |
829 | TMath::Sqrt(1.0 + | |
830 | slopeBending * slopeBending + slopeNonBending * slopeNonBending); | |
831 | inverseBendingMomentum2 = | |
832 | param->GetInverseBendingMomentum() * param->GetInverseBendingMomentum(); | |
833 | inverseTotalMomentum2 = | |
956019b6 | 834 | inverseBendingMomentum2 * (1.0 + slopeBending * slopeBending) / |
04b5ea16 | 835 | (1.0 + slopeBending *slopeBending + slopeNonBending * slopeNonBending); |
836 | varMultipleScatteringAngle = 0.0136 * (1.0 + 0.038 * TMath::Log(radiationLength)); | |
956019b6 | 837 | // The velocity is assumed to be 1 !!!! |
04b5ea16 | 838 | varMultipleScatteringAngle = inverseTotalMomentum2 * radiationLength * |
839 | varMultipleScatteringAngle * varMultipleScatteringAngle; | |
840 | return varMultipleScatteringAngle; | |
841 | } | |
44f59652 | 842 | |
843 | //______________________________________________________________________________ | |
844 | void mnvertLocal(Double_t *a, Int_t l, Int_t, Int_t n, Int_t &ifail) | |
845 | { | |
846 | //*-*-*-*-*-*-*-*-*-*-*-*Inverts a symmetric matrix*-*-*-*-*-*-*-*-*-*-*-*-* | |
847 | //*-* ========================== | |
848 | //*-* inverts a symmetric matrix. matrix is first scaled to | |
849 | //*-* have all ones on the diagonal (equivalent to change of units) | |
850 | //*-* but no pivoting is done since matrix is positive-definite. | |
851 | //*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-* | |
852 | ||
853 | // taken from TMinuit package of Root (l>=n) | |
854 | // fVERTs, fVERTq and fVERTpp changed to localVERTs, localVERTq and localVERTpp | |
e804eb46 | 855 | // Double_t localVERTs[n], localVERTq[n], localVERTpp[n]; |
856 | Double_t * localVERTs = new Double_t[n]; | |
857 | Double_t * localVERTq = new Double_t[n]; | |
858 | Double_t * localVERTpp = new Double_t[n]; | |
44f59652 | 859 | // fMaxint changed to localMaxint |
860 | Int_t localMaxint = n; | |
861 | ||
862 | /* System generated locals */ | |
3831f268 | 863 | Int_t aOffset; |
44f59652 | 864 | |
865 | /* Local variables */ | |
866 | Double_t si; | |
867 | Int_t i, j, k, kp1, km1; | |
868 | ||
869 | /* Parameter adjustments */ | |
3831f268 | 870 | aOffset = l + 1; |
871 | a -= aOffset; | |
44f59652 | 872 | |
873 | /* Function Body */ | |
874 | ifail = 0; | |
875 | if (n < 1) goto L100; | |
876 | if (n > localMaxint) goto L100; | |
877 | //*-*- scale matrix by sqrt of diag elements | |
878 | for (i = 1; i <= n; ++i) { | |
879 | si = a[i + i*l]; | |
880 | if (si <= 0) goto L100; | |
881 | localVERTs[i-1] = 1 / TMath::Sqrt(si); | |
882 | } | |
883 | for (i = 1; i <= n; ++i) { | |
884 | for (j = 1; j <= n; ++j) { | |
885 | a[i + j*l] = a[i + j*l]*localVERTs[i-1]*localVERTs[j-1]; | |
886 | } | |
887 | } | |
888 | //*-*- . . . start main loop . . . . | |
889 | for (i = 1; i <= n; ++i) { | |
890 | k = i; | |
891 | //*-*- preparation for elimination step1 | |
892 | if (a[k + k*l] != 0) localVERTq[k-1] = 1 / a[k + k*l]; | |
893 | else goto L100; | |
894 | localVERTpp[k-1] = 1; | |
895 | a[k + k*l] = 0; | |
896 | kp1 = k + 1; | |
897 | km1 = k - 1; | |
898 | if (km1 < 0) goto L100; | |
899 | else if (km1 == 0) goto L50; | |
900 | else goto L40; | |
901 | L40: | |
902 | for (j = 1; j <= km1; ++j) { | |
903 | localVERTpp[j-1] = a[j + k*l]; | |
904 | localVERTq[j-1] = a[j + k*l]*localVERTq[k-1]; | |
905 | a[j + k*l] = 0; | |
906 | } | |
907 | L50: | |
908 | if (k - n < 0) goto L51; | |
909 | else if (k - n == 0) goto L60; | |
910 | else goto L100; | |
911 | L51: | |
912 | for (j = kp1; j <= n; ++j) { | |
913 | localVERTpp[j-1] = a[k + j*l]; | |
914 | localVERTq[j-1] = -a[k + j*l]*localVERTq[k-1]; | |
915 | a[k + j*l] = 0; | |
916 | } | |
917 | //*-*- elimination proper | |
918 | L60: | |
919 | for (j = 1; j <= n; ++j) { | |
920 | for (k = j; k <= n; ++k) { a[j + k*l] += localVERTpp[j-1]*localVERTq[k-1]; } | |
921 | } | |
922 | } | |
923 | //*-*- elements of left diagonal and unscaling | |
924 | for (j = 1; j <= n; ++j) { | |
925 | for (k = 1; k <= j; ++k) { | |
926 | a[k + j*l] = a[k + j*l]*localVERTs[k-1]*localVERTs[j-1]; | |
927 | a[j + k*l] = a[k + j*l]; | |
928 | } | |
929 | } | |
e804eb46 | 930 | delete localVERTs; |
931 | delete localVERTq; | |
932 | delete localVERTpp; | |
44f59652 | 933 | return; |
934 | //*-*- failure return | |
935 | L100: | |
e804eb46 | 936 | delete localVERTs; |
937 | delete localVERTq; | |
938 | delete localVERTpp; | |
44f59652 | 939 | ifail = 1; |
940 | } /* mnvertLocal */ | |
941 |