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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 | |
2457f726 | 28 | #include <stdlib.h> // for exit() |
29 | #include <Riostream.h> | |
208f139e | 30 | #include <TMatrixD.h> |
2457f726 | 31 | |
63ed9c6b | 32 | #include "AliMUONTrack.h" |
34f1bfa0 | 33 | |
de2cd600 | 34 | #include "AliMUONTrackParam.h" |
a9e2aefa | 35 | #include "AliMUONHitForRec.h" |
d837040f | 36 | #include "AliMUONConstants.h" |
208f139e | 37 | #include "AliMUONTrackExtrap.h" |
a9e2aefa | 38 | |
63ed9c6b | 39 | #include "AliLog.h" |
40 | ||
63ed9c6b | 41 | #include <TMath.h> |
63ed9c6b | 42 | |
7945aae7 | 43 | /// \cond CLASSIMP |
63ed9c6b | 44 | ClassImp(AliMUONTrack) // Class implementation in ROOT context |
7945aae7 | 45 | /// \endcond |
63ed9c6b | 46 | |
208f139e | 47 | const Double_t AliMUONTrack::fgkMaxTrackingDistanceBending = 2.; |
48 | const Double_t AliMUONTrack::fgkMaxTrackingDistanceNonBending = 2.; | |
49 | ||
63ed9c6b | 50 | //__________________________________________________________________________ |
30178c30 | 51 | AliMUONTrack::AliMUONTrack() |
54d7ba50 | 52 | : TObject(), |
54d7ba50 | 53 | fTrackParamAtVertex(), |
54 | fTrackParamAtHit(0x0), | |
55 | fHitForRecAtHit(0x0), | |
54d7ba50 | 56 | fNTrackHits(0), |
208f139e | 57 | fExtrapTrackParam(), |
58 | fFitWithVertex(kFALSE), | |
59 | fVertex(0x0), | |
54d7ba50 | 60 | fFitFMin(-1.), |
61 | fMatchTrigger(kFALSE), | |
62 | fChi2MatchTrigger(0.), | |
63 | fTrackID(0) | |
d837040f | 64 | { |
2457f726 | 65 | /// Default constructor |
d837040f | 66 | } |
67 | ||
a9e2aefa | 68 | //__________________________________________________________________________ |
208f139e | 69 | AliMUONTrack::AliMUONTrack(AliMUONHitForRec* hitForRec1, AliMUONHitForRec* hitForRec2) |
54d7ba50 | 70 | : TObject(), |
54d7ba50 | 71 | fTrackParamAtVertex(), |
72 | fTrackParamAtHit(0x0), | |
73 | fHitForRecAtHit(0x0), | |
54d7ba50 | 74 | fNTrackHits(0), |
208f139e | 75 | fExtrapTrackParam(), |
76 | fFitWithVertex(kFALSE), | |
77 | fVertex(0x0), | |
54d7ba50 | 78 | fFitFMin(-1.), |
79 | fMatchTrigger(kFALSE), | |
80 | fChi2MatchTrigger(0.), | |
81 | fTrackID(0) | |
a9e2aefa | 82 | { |
208f139e | 83 | /// Constructor from thw hitForRec's |
54d7ba50 | 84 | |
d837040f | 85 | fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",10); |
b8dc484b | 86 | fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",10); |
de2cd600 | 87 | |
208f139e | 88 | if (!hitForRec1) return; //AZ |
89 | ||
90 | // Add hits to the track | |
91 | AddTrackParamAtHit(0,hitForRec1); | |
92 | AddTrackParamAtHit(0,hitForRec2); | |
93 | ||
94 | // sort TrackParamAtHit according to increasing -Z | |
95 | fTrackParamAtHit->Sort(); | |
96 | ||
97 | // Set track parameters at first track hit | |
98 | AliMUONTrackParam* trackParamAtFirstHit = (AliMUONTrackParam*) fTrackParamAtHit->First(); | |
99 | AliMUONHitForRec* firstHit = trackParamAtFirstHit->GetHitForRecPtr(); | |
100 | AliMUONHitForRec* lastHit = ((AliMUONTrackParam*) fTrackParamAtHit->Last())->GetHitForRecPtr(); | |
847cbaef | 101 | Double_t dZ = firstHit->GetZ() - lastHit->GetZ(); |
208f139e | 102 | // Non bending plane |
103 | Double_t nonBendingCoor = firstHit->GetNonBendingCoor(); | |
104 | trackParamAtFirstHit->SetNonBendingCoor(nonBendingCoor); | |
105 | trackParamAtFirstHit->SetNonBendingSlope((nonBendingCoor - lastHit->GetNonBendingCoor()) / dZ); | |
106 | // Bending plane | |
107 | Double_t bendingCoor = firstHit->GetBendingCoor(); | |
108 | trackParamAtFirstHit->SetBendingCoor(bendingCoor); | |
109 | Double_t bendingSlope = (bendingCoor - lastHit->GetBendingCoor()) / dZ; | |
110 | trackParamAtFirstHit->SetBendingSlope(bendingSlope); | |
111 | // Inverse bending momentum | |
847cbaef | 112 | Double_t bendingImpact = bendingCoor - firstHit->GetZ() * bendingSlope; |
208f139e | 113 | Double_t inverseBendingMomentum = 1. / AliMUONTrackExtrap::GetBendingMomentumFromImpactParam(bendingImpact); |
114 | trackParamAtFirstHit->SetInverseBendingMomentum(inverseBendingMomentum); | |
115 | ||
116 | // Evaluate covariances | |
117 | TMatrixD *paramCov = trackParamAtFirstHit->GetCovariances(); | |
118 | (*paramCov) = 0; | |
119 | // Non bending plane | |
120 | (*paramCov)(0,0) = firstHit->GetNonBendingReso2(); | |
121 | (*paramCov)(0,1) = firstHit->GetNonBendingReso2() / dZ; | |
122 | (*paramCov)(1,0) = (*paramCov)(0,1); | |
123 | (*paramCov)(1,1) = ( firstHit->GetNonBendingReso2() + lastHit->GetNonBendingReso2() ) / dZ / dZ; | |
124 | // Bending plane | |
125 | (*paramCov)(2,2) = firstHit->GetBendingReso2(); | |
126 | (*paramCov)(2,3) = firstHit->GetBendingReso2() / dZ; | |
127 | (*paramCov)(3,2) = (*paramCov)(2,3); | |
128 | (*paramCov)(3,3) = ( firstHit->GetBendingReso2() + lastHit->GetBendingReso2() ) / dZ / dZ; | |
129 | // Inverse bending momentum (50% error) | |
130 | (*paramCov)(4,4) = 0.5*inverseBendingMomentum * 0.5*inverseBendingMomentum; | |
de2cd600 | 131 | |
a9e2aefa | 132 | } |
133 | ||
8429a5e4 | 134 | //__________________________________________________________________________ |
135 | AliMUONTrack::~AliMUONTrack() | |
136 | { | |
2457f726 | 137 | /// Destructor |
d837040f | 138 | if (fTrackParamAtHit) { |
139 | // delete the TClonesArray of pointers to TrackParam | |
140 | delete fTrackParamAtHit; | |
208f139e | 141 | fTrackParamAtHit = 0x0; |
d837040f | 142 | } |
b8dc484b | 143 | |
144 | if (fHitForRecAtHit) { | |
145 | // delete the TClonesArray of pointers to HitForRec | |
146 | delete fHitForRecAtHit; | |
208f139e | 147 | fHitForRecAtHit = 0x0; |
148 | } | |
149 | ||
150 | if (fVertex) { | |
151 | // delete the vertex used during the tracking procedure | |
152 | delete fVertex; | |
153 | fVertex = 0x0; | |
b8dc484b | 154 | } |
8429a5e4 | 155 | } |
156 | ||
956019b6 | 157 | //__________________________________________________________________________ |
30178c30 | 158 | AliMUONTrack::AliMUONTrack (const AliMUONTrack& theMUONTrack) |
54d7ba50 | 159 | : TObject(theMUONTrack), |
54d7ba50 | 160 | fTrackParamAtVertex(theMUONTrack.fTrackParamAtVertex), |
161 | fTrackParamAtHit(0x0), | |
162 | fHitForRecAtHit(0x0), | |
54d7ba50 | 163 | fNTrackHits(theMUONTrack.fNTrackHits), |
208f139e | 164 | fExtrapTrackParam(theMUONTrack.fExtrapTrackParam), |
165 | fFitWithVertex(theMUONTrack.fFitWithVertex), | |
166 | fVertex(0x0), | |
54d7ba50 | 167 | fFitFMin(theMUONTrack.fFitFMin), |
168 | fMatchTrigger(theMUONTrack.fMatchTrigger), | |
169 | fChi2MatchTrigger(theMUONTrack.fChi2MatchTrigger), | |
170 | fTrackID(theMUONTrack.fTrackID) | |
a9e2aefa | 171 | { |
2457f726 | 172 | ///copy constructor |
de2cd600 | 173 | Int_t maxIndex = 0; |
174 | ||
e516b01d | 175 | // necessary to make a copy of the objects and not only the pointers in TClonesArray. |
a8865299 | 176 | if (theMUONTrack.fTrackParamAtHit) { |
de2cd600 | 177 | maxIndex = (theMUONTrack.fTrackParamAtHit)->GetEntriesFast(); |
208f139e | 178 | fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",maxIndex); |
de2cd600 | 179 | for (Int_t index = 0; index < maxIndex; index++) { |
180 | new ((*fTrackParamAtHit)[index]) AliMUONTrackParam(*(AliMUONTrackParam*)theMUONTrack.fTrackParamAtHit->At(index)); | |
a8865299 | 181 | } |
208f139e | 182 | } |
183 | ||
b8dc484b | 184 | // necessary to make a copy of the objects and not only the pointers in TClonesArray. |
a8865299 | 185 | if (theMUONTrack.fHitForRecAtHit) { |
de2cd600 | 186 | maxIndex = (theMUONTrack.fHitForRecAtHit)->GetEntriesFast(); |
208f139e | 187 | fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",maxIndex); |
de2cd600 | 188 | for (Int_t index = 0; index < maxIndex; index++) { |
189 | new ((*fHitForRecAtHit)[index]) AliMUONHitForRec(*(AliMUONHitForRec*)theMUONTrack.fHitForRecAtHit->At(index)); | |
a8865299 | 190 | } |
208f139e | 191 | } |
192 | ||
193 | // copy vertex used during the tracking procedure if any | |
194 | if (theMUONTrack.fVertex) fVertex = new AliMUONHitForRec(*(theMUONTrack.fVertex)); | |
195 | ||
a9e2aefa | 196 | } |
197 | ||
956019b6 | 198 | //__________________________________________________________________________ |
30178c30 | 199 | AliMUONTrack & AliMUONTrack::operator=(const AliMUONTrack& theMUONTrack) |
a9e2aefa | 200 | { |
2457f726 | 201 | /// Asignment operator |
30178c30 | 202 | // check assignement to self |
203 | if (this == &theMUONTrack) | |
a9e2aefa | 204 | return *this; |
61adb9bd | 205 | |
30178c30 | 206 | // base class assignement |
207 | TObject::operator=(theMUONTrack); | |
208 | ||
de2cd600 | 209 | fTrackParamAtVertex = theMUONTrack.fTrackParamAtVertex; |
e516b01d | 210 | |
de2cd600 | 211 | Int_t maxIndex = 0; |
212 | ||
e516b01d | 213 | // necessary to make a copy of the objects and not only the pointers in TClonesArray. |
a8865299 | 214 | if (theMUONTrack.fTrackParamAtHit) { |
208f139e | 215 | if (fTrackParamAtHit) fTrackParamAtHit->Clear(); |
216 | else fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",10); | |
de2cd600 | 217 | maxIndex = (theMUONTrack.fTrackParamAtHit)->GetEntriesFast(); |
218 | for (Int_t index = 0; index < maxIndex; index++) { | |
219 | new ((*fTrackParamAtHit)[fTrackParamAtHit->GetEntriesFast()]) | |
220 | AliMUONTrackParam(*(AliMUONTrackParam*)(theMUONTrack.fTrackParamAtHit)->At(index)); | |
a8865299 | 221 | } |
208f139e | 222 | } else if (fTrackParamAtHit) { |
223 | delete fTrackParamAtHit; | |
224 | fTrackParamAtHit = 0x0; | |
225 | } | |
e516b01d | 226 | |
b8dc484b | 227 | // necessary to make a copy of the objects and not only the pointers in TClonesArray. |
de2cd600 | 228 | if (theMUONTrack.fHitForRecAtHit) { |
208f139e | 229 | if (fHitForRecAtHit) fHitForRecAtHit->Clear(); |
230 | else fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",10); | |
de2cd600 | 231 | maxIndex = (theMUONTrack.fHitForRecAtHit)->GetEntriesFast(); |
232 | for (Int_t index = 0; index < maxIndex; index++) { | |
233 | new ((*fHitForRecAtHit)[fHitForRecAtHit->GetEntriesFast()]) | |
234 | AliMUONHitForRec(*(AliMUONHitForRec*)(theMUONTrack.fHitForRecAtHit)->At(index)); | |
a8865299 | 235 | } |
208f139e | 236 | } else if (fHitForRecAtHit) { |
237 | delete fHitForRecAtHit; | |
238 | fHitForRecAtHit = 0x0; | |
239 | } | |
240 | ||
241 | // copy vertex used during the tracking procedure if any. | |
242 | if (theMUONTrack.fVertex) { | |
243 | if (fVertex) *fVertex = *(theMUONTrack.fVertex); | |
244 | else fVertex = new AliMUONHitForRec(*(theMUONTrack.fVertex)); | |
245 | } else if (fVertex) { | |
246 | delete fVertex; | |
247 | fVertex = 0x0; | |
248 | } | |
249 | ||
250 | fExtrapTrackParam = theMUONTrack.fExtrapTrackParam; | |
de2cd600 | 251 | |
30178c30 | 252 | fNTrackHits = theMUONTrack.fNTrackHits; |
208f139e | 253 | fFitWithVertex = theMUONTrack.fFitWithVertex; |
30178c30 | 254 | fFitFMin = theMUONTrack.fFitFMin; |
30178c30 | 255 | fMatchTrigger = theMUONTrack.fMatchTrigger; |
256 | fChi2MatchTrigger = theMUONTrack.fChi2MatchTrigger; | |
b8dc484b | 257 | fTrackID = theMUONTrack.fTrackID; |
30178c30 | 258 | |
61adb9bd | 259 | return *this; |
a9e2aefa | 260 | } |
261 | ||
8429a5e4 | 262 | //__________________________________________________________________________ |
de2cd600 | 263 | void AliMUONTrack::AddTrackParamAtHit(AliMUONTrackParam *trackParam, AliMUONHitForRec *hitForRec) |
8429a5e4 | 264 | { |
847cbaef | 265 | /// Add TrackParamAtHit if "trackParam" != NULL |
266 | /// else create empty TrackParamAtHit and set the z position to the one of "hitForRec" if any | |
2457f726 | 267 | /// Update link to HitForRec if "hitForRec" != NULL |
de2cd600 | 268 | if (!fTrackParamAtHit) { |
269 | fTrackParamAtHit = new TClonesArray("AliMUONTrackParam",10); | |
270 | fNTrackHits = 0; | |
956019b6 | 271 | } |
2457f726 | 272 | AliMUONTrackParam* trackParamAtHit; |
847cbaef | 273 | if (trackParam) { |
274 | trackParamAtHit = new ((*fTrackParamAtHit)[fNTrackHits]) AliMUONTrackParam(*trackParam); | |
275 | if (hitForRec) { | |
276 | if (hitForRec->GetZ() != trackParam->GetZ()) | |
277 | AliWarning("Added track parameters at a different z position than the one of the attached hit"); | |
278 | } | |
279 | } else { | |
280 | trackParamAtHit = new ((*fTrackParamAtHit)[fNTrackHits]) AliMUONTrackParam(); | |
281 | if (hitForRec) ((AliMUONTrackParam*) fTrackParamAtHit->UncheckedAt(fNTrackHits))->SetZ(hitForRec->GetZ()); | |
282 | } | |
2457f726 | 283 | if (hitForRec) trackParamAtHit->SetHitForRecPtr(hitForRec); |
de2cd600 | 284 | fNTrackHits++; |
956019b6 | 285 | } |
286 | ||
287 | //__________________________________________________________________________ | |
de2cd600 | 288 | void AliMUONTrack::AddHitForRecAtHit(const AliMUONHitForRec *hitForRec) |
956019b6 | 289 | { |
2457f726 | 290 | /// Add hitForRec to the array of hitForRec at hit |
de2cd600 | 291 | if (!fHitForRecAtHit) |
292 | fHitForRecAtHit = new TClonesArray("AliMUONHitForRec",10); | |
293 | ||
294 | if (!hitForRec) | |
295 | AliFatal("AliMUONTrack::AddHitForRecAtHit: hitForRec == NULL"); | |
296 | ||
297 | new ((*fHitForRecAtHit)[fHitForRecAtHit->GetEntriesFast()]) AliMUONHitForRec(*hitForRec); | |
04b5ea16 | 298 | } |
299 | ||
b8dc484b | 300 | //__________________________________________________________________________ |
208f139e | 301 | void AliMUONTrack::SetVertex(AliMUONHitForRec* vertex) |
302 | { | |
303 | /// Set the vertex used during the tracking procedure | |
304 | if (!fVertex) fVertex = new AliMUONHitForRec(*vertex); | |
305 | else *fVertex = *vertex; | |
306 | } | |
307 | ||
308 | //__________________________________________________________________________ | |
309 | Int_t AliMUONTrack::HitsInCommon(AliMUONTrack* track) const | |
310 | { | |
311 | /// Returns the number of hits in common between the current track ("this") | |
312 | /// and the track pointed to by "track". | |
313 | Int_t hitsInCommon = 0; | |
314 | AliMUONTrackParam *trackParamAtHit1, *trackParamAtHit2; | |
315 | // Loop over hits of first track | |
316 | trackParamAtHit1 = (AliMUONTrackParam*) this->fTrackParamAtHit->First(); | |
317 | while (trackParamAtHit1) { | |
318 | // Loop over hits of second track | |
319 | trackParamAtHit2 = (AliMUONTrackParam*) track->fTrackParamAtHit->First(); | |
320 | while (trackParamAtHit2) { | |
321 | // Increment "hitsInCommon" if both TrackParamAtHits point to the same HitForRec | |
322 | if ((trackParamAtHit1->GetHitForRecPtr()) == (trackParamAtHit2->GetHitForRecPtr())) { | |
323 | hitsInCommon++; | |
324 | break; | |
325 | } | |
326 | trackParamAtHit2 = (AliMUONTrackParam*) track->fTrackParamAtHit->After(trackParamAtHit2); | |
327 | } // trackParamAtHit2 | |
328 | trackParamAtHit1 = (AliMUONTrackParam*) this->fTrackParamAtHit->After(trackParamAtHit1); | |
329 | } // trackParamAtHit1 | |
330 | return hitsInCommon; | |
331 | } | |
332 | ||
333 | //__________________________________________________________________________ | |
334 | Bool_t* AliMUONTrack::CompatibleTrack(AliMUONTrack * track, Double_t sigma2Cut) const | |
b8dc484b | 335 | { |
2457f726 | 336 | /// Return kTRUE/kFALSE for each chamber if hit is compatible or not |
b8dc484b | 337 | TClonesArray *hitArray, *thisHitArray; |
338 | AliMUONHitForRec *hit, *thisHit; | |
339 | Int_t chamberNumber; | |
340 | Float_t deltaZ; | |
341 | Float_t deltaZMax = 1.; // 1 cm | |
342 | Float_t chi2 = 0; | |
343 | Bool_t *nCompHit = new Bool_t[AliMUONConstants::NTrackingCh()]; | |
344 | ||
345 | for ( Int_t ch = 0; ch < AliMUONConstants::NTrackingCh(); ch++) { | |
346 | nCompHit[ch] = kFALSE; | |
347 | } | |
348 | ||
349 | thisHitArray = this->GetHitForRecAtHit(); | |
350 | ||
208f139e | 351 | hitArray = track->GetHitForRecAtHit(); |
b8dc484b | 352 | |
353 | for (Int_t iHthis = 0; iHthis < thisHitArray->GetEntriesFast(); iHthis++) { | |
354 | thisHit = (AliMUONHitForRec*) thisHitArray->At(iHthis); | |
355 | chamberNumber = thisHit->GetChamberNumber(); | |
356 | if (chamberNumber < 0 || chamberNumber > AliMUONConstants::NTrackingCh()) continue; | |
357 | nCompHit[chamberNumber] = kFALSE; | |
358 | for (Int_t iH = 0; iH < hitArray->GetEntriesFast(); iH++) { | |
359 | hit = (AliMUONHitForRec*) hitArray->At(iH); | |
360 | deltaZ = TMath::Abs(thisHit->GetZ() - hit->GetZ()); | |
208f139e | 361 | chi2 = thisHit->NormalizedChi2WithHitForRec(hit,sigma2Cut); // set cut to 4 sigmas |
b8dc484b | 362 | if (chi2 < 3. && deltaZ < deltaZMax) { |
363 | nCompHit[chamberNumber] = kTRUE; | |
364 | break; | |
365 | } | |
366 | } | |
367 | } | |
368 | ||
369 | return nCompHit; | |
370 | } | |
a9e2aefa | 371 | |
8429a5e4 | 372 | //__________________________________________________________________________ |
208f139e | 373 | Double_t AliMUONTrack::TryOneHitForRec(AliMUONHitForRec* hitForRec) |
8429a5e4 | 374 | { |
208f139e | 375 | /// Test the compatibility between the track and the hitForRec: |
376 | /// return the corresponding Chi2 | |
377 | ||
378 | // Get track parameters and their covariances at the z position of hitForRec | |
379 | AliMUONTrackParam extrapTrackParam(fExtrapTrackParam); | |
380 | AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam, hitForRec->GetZ()); | |
381 | ||
382 | // Set differences between trackParam and hitForRec in the bending and non bending directions | |
383 | TMatrixD dPos(2,1); | |
384 | dPos(0,0) = hitForRec->GetNonBendingCoor() - extrapTrackParam.GetNonBendingCoor(); | |
385 | dPos(1,0) = hitForRec->GetBendingCoor() - extrapTrackParam.GetBendingCoor(); | |
386 | ||
387 | // quick test of hitForRec compatibility within a wide road of x*y = 10*1 cm2 to save computing time | |
388 | if (TMath::Abs(dPos(0,0)) > fgkMaxTrackingDistanceNonBending || | |
389 | TMath::Abs(dPos(1,0)) > fgkMaxTrackingDistanceBending) return 1.e10; | |
390 | ||
391 | // Set the error matrix from trackParam covariances and hitForRec resolution | |
392 | TMatrixD* paramCov = extrapTrackParam.GetCovariances(); | |
393 | TMatrixD error(2,2); | |
394 | error(0,0) = (*paramCov)(0,0) + hitForRec->GetNonBendingReso2(); | |
395 | error(0,1) = (*paramCov)(0,2); | |
396 | error(1,0) = (*paramCov)(2,0); | |
397 | error(1,1) = (*paramCov)(2,2) + hitForRec->GetBendingReso2(); | |
398 | ||
399 | // Invert the error matrix for Chi2 calculation | |
400 | if (error.Determinant() != 0) { | |
401 | error.Invert(); | |
402 | } else { | |
403 | AliWarning(" Determinant error=0"); | |
404 | return 1.e10; | |
405 | } | |
406 | ||
407 | // Compute the Chi2 value | |
408 | TMatrixD tmp(error,TMatrixD::kMult,dPos); | |
409 | TMatrixD result(dPos,TMatrixD::kTransposeMult,tmp); | |
410 | ||
411 | return result(0,0); | |
412 | ||
413 | } | |
414 | ||
415 | //__________________________________________________________________________ | |
416 | Double_t AliMUONTrack::TryTwoHitForRec(AliMUONHitForRec* hitForRec1, AliMUONHitForRec* hitForRec2) | |
417 | { | |
418 | /// Test the compatibility between the track and the 2 hitForRec together: | |
419 | /// return the corresponding Chi2 accounting for covariances between the 2 hitForRec | |
420 | ||
421 | // Get track parameters and their covariances at the z position of the first hitForRec | |
422 | AliMUONTrackParam extrapTrackParam1(fExtrapTrackParam); | |
423 | AliMUONTrackExtrap::ExtrapToZCov(&extrapTrackParam1, hitForRec1->GetZ()); | |
424 | ||
425 | // Get track parameters at second hitForRec | |
426 | AliMUONTrackParam extrapTrackParam2(extrapTrackParam1); | |
427 | AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParam2, hitForRec2->GetZ()); | |
428 | ||
429 | // Set differences between track and the 2 hitForRec in the bending and non bending directions | |
430 | TMatrixD dPos(4,1); | |
431 | dPos(0,0) = hitForRec1->GetNonBendingCoor() - extrapTrackParam1.GetNonBendingCoor(); | |
432 | dPos(1,0) = hitForRec1->GetBendingCoor() - extrapTrackParam1.GetBendingCoor(); | |
433 | dPos(2,0) = hitForRec2->GetNonBendingCoor() - extrapTrackParam2.GetNonBendingCoor(); | |
434 | dPos(3,0) = hitForRec2->GetBendingCoor() - extrapTrackParam2.GetBendingCoor(); | |
435 | ||
436 | // quick tests of hitForRec compatibility within a wide road of x*y = 1*1 cm2 to save computing time | |
437 | if (TMath::Abs(dPos(0,0)) > fgkMaxTrackingDistanceNonBending || | |
438 | TMath::Abs(dPos(1,0)) > fgkMaxTrackingDistanceBending || | |
439 | TMath::Abs(dPos(2,0)) > fgkMaxTrackingDistanceNonBending || | |
440 | TMath::Abs(dPos(3,0)) > fgkMaxTrackingDistanceBending) return 1.e10; | |
441 | ||
442 | // Calculate the error matrix from the track parameter covariances at first hitForRec | |
443 | TMatrixD error(4,4); | |
444 | error = 0.; | |
445 | if (extrapTrackParam1.CovariancesExist()) { | |
446 | // Get the pointer to the parameter covariance matrix at first hitForRec | |
447 | TMatrixD* paramCov = extrapTrackParam1.GetCovariances(); | |
448 | ||
449 | // Save track parameters at first hitForRec | |
450 | AliMUONTrackParam extrapTrackParam1Save(extrapTrackParam1); | |
451 | Double_t nonBendingCoor1 = extrapTrackParam1Save.GetNonBendingCoor(); | |
452 | Double_t nonBendingSlope1 = extrapTrackParam1Save.GetNonBendingSlope(); | |
453 | Double_t bendingCoor1 = extrapTrackParam1Save.GetBendingCoor(); | |
454 | Double_t bendingSlope1 = extrapTrackParam1Save.GetBendingSlope(); | |
455 | Double_t inverseBendingMomentum1 = extrapTrackParam1Save.GetInverseBendingMomentum(); | |
456 | Double_t z1 = extrapTrackParam1Save.GetZ(); | |
457 | ||
458 | // Save track coordinates at second hitForRec | |
459 | Double_t nonBendingCoor2 = extrapTrackParam2.GetNonBendingCoor(); | |
460 | Double_t bendingCoor2 = extrapTrackParam2.GetBendingCoor(); | |
461 | ||
462 | // Calculate the jacobian related to the transformation between track parameters | |
463 | // at first hitForRec and track coordinates at the 2 hitForRec z-position | |
464 | TMatrixD jacob(4,5); | |
465 | jacob = 0.; | |
466 | // first derivative at the first hitForRec: | |
467 | jacob(0,0) = 1.; // dx1/dx | |
468 | jacob(1,2) = 1.; // dy1/dy | |
469 | // first derivative at the second hitForRec: | |
470 | Double_t dParam[5]; | |
471 | for (Int_t i=0; i<5; i++) { | |
472 | // Skip jacobian calculation for parameters with no associated error | |
473 | if ((*paramCov)(i,i) == 0.) continue; | |
474 | // Small variation of parameter i only | |
475 | for (Int_t j=0; j<5; j++) { | |
476 | if (j==i) { | |
477 | dParam[j] = TMath::Sqrt((*paramCov)(i,i)); | |
478 | if (j == 4) dParam[j] *= TMath::Sign(1.,-inverseBendingMomentum1); // variation always in the same direction | |
479 | } else dParam[j] = 0.; | |
480 | } | |
481 | // Set new track parameters at first hitForRec | |
482 | extrapTrackParam1Save.SetNonBendingCoor (nonBendingCoor1 + dParam[0]); | |
483 | extrapTrackParam1Save.SetNonBendingSlope (nonBendingSlope1 + dParam[1]); | |
484 | extrapTrackParam1Save.SetBendingCoor (bendingCoor1 + dParam[2]); | |
485 | extrapTrackParam1Save.SetBendingSlope (bendingSlope1 + dParam[3]); | |
486 | extrapTrackParam1Save.SetInverseBendingMomentum(inverseBendingMomentum1 + dParam[4]); | |
487 | extrapTrackParam1Save.SetZ (z1); | |
488 | // Extrapolate new track parameters to the z position of the second hitForRec | |
489 | AliMUONTrackExtrap::ExtrapToZ(&extrapTrackParam1Save,hitForRec2->GetZ()); | |
490 | // Calculate the jacobian | |
491 | jacob(2,i) = (extrapTrackParam1Save.GetNonBendingCoor() - nonBendingCoor2) / dParam[i]; // dx2/dParami | |
492 | jacob(3,i) = (extrapTrackParam1Save.GetBendingCoor() - bendingCoor2 ) / dParam[i]; // dy2/dParami | |
493 | } | |
494 | ||
495 | // Calculate the error matrix | |
496 | TMatrixD tmp((*paramCov),TMatrixD::kMultTranspose,jacob); | |
497 | error = TMatrixD(jacob,TMatrixD::kMult,tmp); | |
498 | } | |
499 | ||
500 | // Add hitForRec resolution to the error matrix | |
501 | error(0,0) += hitForRec1->GetNonBendingReso2(); | |
502 | error(1,1) += hitForRec1->GetBendingReso2(); | |
503 | error(2,2) += hitForRec2->GetNonBendingReso2(); | |
504 | error(3,3) += hitForRec2->GetBendingReso2(); | |
505 | ||
506 | // invert the error matrix for Chi2 calculation | |
507 | if (error.Determinant() != 0) { | |
508 | error.Invert(); | |
509 | } else { | |
510 | AliWarning(" Determinant error=0"); | |
511 | return 1.e10; | |
512 | } | |
513 | ||
514 | // Compute the Chi2 value | |
515 | TMatrixD tmp2(error,TMatrixD::kMult,dPos); | |
516 | TMatrixD result(dPos,TMatrixD::kTransposeMult,tmp2); | |
517 | ||
518 | return result(0,0); | |
519 | ||
8429a5e4 | 520 | } |
521 | ||
d837040f | 522 | //__________________________________________________________________________ |
de2cd600 | 523 | void AliMUONTrack::RecursiveDump(void) const |
a9e2aefa | 524 | { |
2457f726 | 525 | /// Recursive dump of AliMUONTrack, i.e. with dump of TrackParamAtHit's and attached HitForRec's |
de2cd600 | 526 | AliMUONTrackParam *trackParamAtHit; |
527 | AliMUONHitForRec *hitForRec; | |
528 | cout << "Recursive dump of Track: " << this << endl; | |
529 | // Track | |
530 | this->Dump(); | |
531 | for (Int_t trackHitIndex = 0; trackHitIndex < fNTrackHits; trackHitIndex++) { | |
532 | trackParamAtHit = (AliMUONTrackParam*) ((*fTrackParamAtHit)[trackHitIndex]); | |
533 | // TrackHit | |
534 | cout << "TrackParamAtHit: " << trackParamAtHit << " (index: " << trackHitIndex << ")" << endl; | |
535 | trackParamAtHit->Dump(); | |
536 | hitForRec = trackParamAtHit->GetHitForRecPtr(); | |
537 | // HitForRec | |
538 | cout << "HitForRec: " << hitForRec << endl; | |
539 | hitForRec->Dump(); | |
a9e2aefa | 540 | } |
de2cd600 | 541 | return; |
a9e2aefa | 542 | } |
04b5ea16 | 543 | |
6464217e | 544 | //_____________________________________________- |
545 | void AliMUONTrack::Print(Option_t* opt) const | |
546 | { | |
2457f726 | 547 | /// Printing Track information |
548 | /// "full" option for printing all the information about the track | |
6464217e | 549 | TString sopt(opt); |
550 | sopt.ToUpper(); | |
551 | ||
552 | if ( sopt.Contains("FULL") ) { | |
553 | cout << "<AliMUONTrack> No.Clusters=" << setw(2) << GetNTrackHits() << | |
554 | // ", Bending P="<< setw(8) << setprecision(5) << 1./GetInverseBendingMomentum() << | |
555 | //", NonBendSlope=" << setw(8) << setprecision(5) << GetNonBendingSlope()*180./TMath::Pi() << | |
556 | //", BendSlope=" << setw(8) << setprecision(5) << GetBendingSlope()*180./TMath::Pi() << | |
557 | ", Match2Trig=" << setw(1) << GetMatchTrigger() << | |
558 | ", Chi2-tracking-trigger=" << setw(8) << setprecision(5) << GetChi2MatchTrigger() << endl ; | |
559 | GetTrackParamAtHit()->First()->Print("full"); | |
560 | } | |
561 | else { | |
562 | cout << "<AliMUONTrack>"; | |
563 | GetTrackParamAtHit()->First()->Print(""); | |
564 | ||
565 | } | |
566 | ||
567 | } |