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