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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 | ||
16 | /* | |
17 | $Log$ | |
3831f268 | 18 | Revision 1.7 2001/02/08 10:34:41 gosset |
19 | Add a "real" default constructor. | |
20 | ||
762647ff | 21 | Revision 1.6 2001/02/05 14:49:29 hristov |
22 | Compare() declared const (R.Brun) | |
23 | ||
2a941f4e | 24 | Revision 1.5 2001/01/08 11:01:02 gosset |
25 | Modifications used for addendum to Dimuon TDR (JP Cussonneau): | |
26 | *. MaxBendingMomentum to make both a segment and a track (default 500) | |
27 | *. MaxChi2 per degree of freedom to make a track (default 100) | |
28 | *. MinBendingMomentum used also to make a track | |
29 | and not only a segment (default 3) | |
30 | *. wider roads for track search in stations 1 to 3 | |
31 | *. extrapolation to actual Z instead of Z(chamber) in FollowTracks | |
32 | *. in track fit: | |
33 | - limits on parameters X and Y (+/-500) | |
34 | - covariance matrices in double precision | |
35 | - normalization of covariance matrices before inversion | |
36 | - suppression of Minuit printouts | |
37 | *. correction against memory leak (delete extrapHit) in FollowTracks | |
38 | *. RMax to 10 degrees with Z(chamber) instead of fixed values; | |
39 | RMin and Rmax cuts suppressed in NewHitForRecFromGEANT, | |
40 | because useless with realistic geometry | |
41 | ||
d0bfce8d | 42 | Revision 1.4 2000/06/30 10:15:48 gosset |
43 | Changes to EventReconstructor...: | |
44 | precision fit with multiple Coulomb scattering; | |
45 | extrapolation to vertex with Branson correction in absorber (JPC) | |
46 | ||
04b5ea16 | 47 | Revision 1.3 2000/06/25 13:06:39 hristov |
48 | Inline functions moved from *.cxx to *.h files instead of forward declarations | |
49 | ||
9b03f36b | 50 | Revision 1.2 2000/06/15 07:58:48 morsch |
51 | Code from MUON-dev joined | |
52 | ||
a9e2aefa | 53 | Revision 1.1.2.4 2000/06/12 10:10:21 morsch |
54 | Dummy copy constructor and assignment operator added | |
55 | ||
56 | Revision 1.1.2.3 2000/06/09 21:01:16 morsch | |
57 | Make includes consistent with new file structure. | |
58 | ||
59 | Revision 1.1.2.2 2000/06/09 12:58:05 gosset | |
60 | Removed comment beginnings in Log sections of .cxx files | |
61 | Suppressed most violations of coding rules | |
62 | ||
63 | Revision 1.1.2.1 2000/06/07 14:44:53 gosset | |
64 | Addition of files for track reconstruction in C++ | |
65 | */ | |
66 | ||
3831f268 | 67 | /////////////////////////////////////////////////////////// |
a9e2aefa | 68 | // |
3831f268 | 69 | // Segment for reconstruction |
70 | // in | |
71 | // ALICE | |
72 | // dimuon | |
73 | // spectrometer: | |
a9e2aefa | 74 | // two hits for reconstruction in the two chambers of one station |
3831f268 | 75 | // |
76 | /////////////////////////////////////////////////////////// | |
a9e2aefa | 77 | |
78 | #include "AliMUON.h" | |
3831f268 | 79 | #include "AliMUONChamber.h" |
a9e2aefa | 80 | #include "AliMUONHitForRec.h" |
3831f268 | 81 | #include "AliMUONSegment.h" |
a9e2aefa | 82 | #include "AliMUONTrackParam.h" |
3831f268 | 83 | #include "AliRun.h" // for gAlice |
a9e2aefa | 84 | |
85 | ClassImp(AliMUONSegment) // Class implementation in ROOT context | |
86 | ||
762647ff | 87 | //__________________________________________________________________________ |
88 | AliMUONSegment::AliMUONSegment() | |
89 | { | |
90 | // Default constructor | |
91 | fHitForRecPtr1 = 0; // pointer to HitForRec in first chamber | |
92 | fHitForRecPtr2 = 0; // pointer to HitForRec in second chamber | |
93 | // Bending plane: | |
94 | fBendingCoor = 0.0; // Coordinate in bending plane | |
95 | fBendingSlope = 0.0; // Slope in bending plane | |
96 | // Covariance in bending plane: | |
97 | fBendingCoorReso2 = 0.0; // Covariance(coordinate C1 in first chamber) | |
98 | fBendingSlopeReso2 = 0.0; // Covariance(slope) | |
99 | fBendingCoorSlopeReso2 = 0.0; // Covariance(C1,slope) | |
100 | fBendingImpact = 0.0; // Impact parameter in bending plane | |
101 | // Non Bending plane: | |
102 | fNonBendingCoor = 0.0; // Coordinate in non bending plane | |
103 | fNonBendingSlope = 0.0; // Slope in non bending plane | |
104 | // Covariance in non bending plane: | |
105 | fNonBendingCoorReso2 = 0.0; // Covariance(coordinate C1 in first chamber) | |
106 | fNonBendingSlopeReso2 = 0.0; // Covariance(slope) | |
107 | fNonBendingCoorSlopeReso2 = 0.0; // Covariance(C1,slope) | |
108 | fNonBendingImpact = 0.0; // Impact parameter in non bending plane | |
109 | fInTrack = kFALSE; // TRUE if segment belongs to one track | |
110 | } | |
111 | ||
a9e2aefa | 112 | //__________________________________________________________________________ |
113 | AliMUONSegment::AliMUONSegment(AliMUONHitForRec* Hit1, AliMUONHitForRec* Hit2) | |
114 | { | |
115 | // Constructor for AliMUONSegment from two HitForRec's, | |
116 | // one, in the first chamber of the station, pointed to by "Hit1", | |
117 | // the other one, in the second chamber of the station, pointed to by "Hit1". | |
118 | // Fills the pointers to both hits, | |
119 | // the slope, the covariance for (coordinate in first chamber, slope), | |
120 | // and the impact parameter at vertex (Z=0), | |
121 | // in bending and non bending planes. | |
122 | // Puts the "fInTrack" flag to "kFALSE". | |
123 | Double_t dz; | |
124 | // pointers to HitForRec's | |
125 | fHitForRecPtr1 = Hit1; | |
126 | fHitForRecPtr2 = Hit2; | |
127 | dz = Hit1->GetZ() - Hit2->GetZ(); | |
128 | // bending plane | |
129 | fBendingCoor = Hit1->GetBendingCoor(); | |
130 | fBendingSlope = (fBendingCoor - Hit2->GetBendingCoor()) / dz; | |
131 | fBendingImpact = fBendingCoor - Hit1->GetZ() * fBendingSlope; | |
132 | fBendingCoorReso2 = Hit1->GetBendingReso2(); | |
133 | fBendingSlopeReso2 = ( Hit1->GetBendingReso2() + | |
134 | Hit2->GetBendingReso2() ) / dz / dz; | |
135 | fBendingCoorSlopeReso2 = Hit1->GetBendingReso2() / dz; | |
136 | // non bending plane | |
137 | fNonBendingCoor = Hit1->GetNonBendingCoor(); | |
138 | fNonBendingSlope = (fNonBendingCoor - Hit2->GetNonBendingCoor()) / dz; | |
139 | fNonBendingImpact = fNonBendingCoor - Hit1->GetZ() * fNonBendingSlope; | |
140 | fNonBendingCoorReso2 = Hit1->GetNonBendingReso2(); | |
141 | fNonBendingSlopeReso2 = ( Hit1->GetNonBendingReso2() + | |
142 | Hit2->GetNonBendingReso2() ) / dz / dz; | |
143 | fNonBendingCoorSlopeReso2 = Hit1->GetNonBendingReso2() / dz; | |
144 | // "fInTrack" flag to "kFALSE" | |
145 | fInTrack = kFALSE; | |
146 | return; | |
147 | } | |
148 | ||
149 | AliMUONSegment::AliMUONSegment (const AliMUONSegment& MUONSegment) | |
150 | { | |
151 | // Dummy copy constructor | |
152 | } | |
153 | ||
154 | AliMUONSegment & AliMUONSegment::operator=(const AliMUONSegment& MUONSegment) | |
155 | { | |
156 | // Dummy assignment operator | |
157 | return *this; | |
158 | } | |
159 | ||
a9e2aefa | 160 | //__________________________________________________________________________ |
2a941f4e | 161 | Int_t AliMUONSegment::Compare(const TObject* Segment) const |
a9e2aefa | 162 | { |
163 | // "Compare" function to sort with increasing absolute value | |
164 | // of the "impact parameter" in bending plane. | |
165 | // Returns -1 (0, +1) if |impact parameter| of current Segment | |
166 | // is smaller than (equal to, larger than) |impact parameter| of Segment | |
167 | if (TMath::Abs(((AliMUONSegment*)this)->fBendingSlope) | |
168 | < TMath::Abs(((AliMUONSegment*)Segment)->fBendingSlope)) | |
169 | return(-1); | |
170 | // continuous parameter, hence no need for testing equal case | |
171 | else return(+1); | |
172 | } | |
173 | ||
174 | //__________________________________________________________________________ | |
175 | Double_t AliMUONSegment::NormalizedChi2WithSegment(AliMUONSegment* Segment, Double_t Sigma2Cut) | |
176 | { | |
177 | // Calculate the normalized Chi2 between the current Segment (this) | |
178 | // and the Segment pointed to by "Segment", | |
179 | // i.e. the square deviations between the coordinates and the slopes, | |
180 | // in both the bending and the non bending plane, | |
181 | // divided by the variance of the same quantities and by "Sigma2Cut". | |
182 | // Returns 5 if none of the 4 quantities is OK, | |
183 | // something smaller than or equal to 4 otherwise. | |
184 | // Would it be more correct to use a real chi square | |
185 | // including the non diagonal term ???? | |
186 | Double_t chi2, chi2Max, diff, normDiff; | |
187 | chi2 = 0.0; | |
188 | chi2Max = 5.0; | |
189 | // coordinate in bending plane | |
190 | diff = this->fBendingCoor - Segment->fBendingCoor; | |
191 | normDiff = diff * diff / | |
192 | (this->fBendingCoorReso2 + Segment->fBendingCoorReso2) / Sigma2Cut; | |
193 | if (normDiff > 1.0) return chi2Max; | |
194 | chi2 = chi2 + normDiff; | |
195 | // slope in bending plane | |
196 | diff = this->fBendingSlope - Segment->fBendingSlope; | |
197 | normDiff = diff * diff / | |
198 | (this->fBendingSlopeReso2 + Segment->fBendingSlopeReso2) / Sigma2Cut; | |
199 | if (normDiff > 1.0) return chi2Max; | |
200 | chi2 = chi2 + normDiff; | |
201 | // coordinate in non bending plane | |
202 | diff = this->fNonBendingCoor - Segment->fNonBendingCoor; | |
203 | normDiff = diff * diff / | |
204 | (this->fNonBendingCoorReso2 + Segment->fNonBendingCoorReso2) / Sigma2Cut; | |
205 | if (normDiff > 1.0) return chi2Max; | |
206 | chi2 = chi2 + normDiff; | |
207 | // slope in non bending plane | |
208 | diff = this->fNonBendingSlope - Segment->fNonBendingSlope; | |
209 | normDiff = diff * diff / | |
210 | (this->fNonBendingSlopeReso2 + Segment->fNonBendingSlopeReso2) / Sigma2Cut; | |
211 | if (normDiff > 1.0) return chi2Max; | |
212 | chi2 = chi2 + normDiff; | |
213 | return chi2; | |
214 | } | |
215 | ||
216 | //__________________________________________________________________________ | |
217 | AliMUONSegment* AliMUONSegment::CreateSegmentFromLinearExtrapToStation (Int_t Station, Double_t MCSfactor) | |
218 | { | |
219 | // Extrapolates linearly the current Segment (this) to station (0..) "Station". | |
220 | // Multiple Coulomb scattering calculated from "MCSfactor" | |
221 | // corresponding to one chamber, | |
222 | // with one chamber for the coordinate, two chambers for the angle, | |
223 | // due to the arrangement in stations. | |
224 | // Valid from station(1..) 4 to 5 or vice versa. | |
225 | // Returns the pointer to the created AliMUONSegment object | |
226 | // corresponding to this extrapolation. | |
227 | // The caller has the responsibility to delete this object. | |
228 | AliMUONSegment* extrapSegment = new AliMUONSegment(); // creates empty new segment | |
229 | // dZ from first hit of current Segment to first chamber of station "Station" | |
230 | AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ???? | |
231 | Double_t dZ = | |
232 | (&(pMUON->Chamber(2 * Station)))->Z() - (this->fHitForRecPtr1)->GetZ(); | |
233 | // Data in bending plane | |
234 | // coordinate | |
235 | extrapSegment->fBendingCoor = this->fBendingCoor + this->fBendingSlope * dZ; | |
236 | // slope | |
237 | extrapSegment->fBendingSlope = this->fBendingSlope; | |
238 | // covariance, including multiple Coulomb scattering over dZ due to one chamber | |
239 | extrapSegment->fBendingCoorReso2 = this->fBendingCoorReso2 + | |
240 | (this->fBendingSlopeReso2 + MCSfactor) * dZ * dZ; // missing non diagonal term: "2.0 * this->fBendingCoorSlopeReso2 * dZ" !!!! | |
241 | extrapSegment->fBendingSlopeReso2 = this->fBendingSlopeReso2 + 2.0 * MCSfactor; | |
242 | extrapSegment->fBendingCoorSlopeReso2 = | |
243 | this->fBendingCoorSlopeReso2 + this->fBendingSlopeReso2 * dZ; // missing: contribution from multiple Coulomb scattering !!!! | |
244 | // Data in non bending plane | |
245 | // coordinate | |
246 | extrapSegment->fNonBendingCoor = | |
247 | this->fNonBendingCoor + this->fNonBendingSlope * dZ; | |
248 | // slope | |
249 | extrapSegment->fNonBendingSlope = this->fNonBendingSlope; | |
250 | // covariance, including multiple Coulomb scattering over dZ due to one chamber | |
251 | extrapSegment->fNonBendingCoorReso2 = this->fNonBendingCoorReso2 + | |
252 | (this->fNonBendingSlopeReso2 + MCSfactor) *dZ * dZ; // missing non diagonal term: "2.0 * this->fNonBendingCoorSlopeReso2 * dZ" !!!! | |
253 | extrapSegment->fNonBendingSlopeReso2 = | |
254 | this->fNonBendingSlopeReso2 + 2.0 * MCSfactor; | |
255 | extrapSegment->fNonBendingCoorSlopeReso2 = | |
256 | this->fNonBendingCoorSlopeReso2 + this->fNonBendingSlopeReso2 * dZ; // missing: contribution from multiple Coulomb scattering !!!! | |
257 | return extrapSegment; | |
258 | } | |
259 | ||
260 | //__________________________________________________________________________ | |
261 | AliMUONHitForRec* AliMUONSegment::CreateHitForRecFromLinearExtrapToChamber (Int_t Chamber, Double_t MCSfactor) | |
262 | { | |
263 | // Extrapolates linearly the current Segment (this) to chamber(0..) "Chamber". | |
264 | // Multiple Coulomb scattering calculated from "MCSfactor" | |
265 | // corresponding to one chamber. | |
266 | // Valid from station(1..) 4 to 5 or vice versa. | |
267 | // Returns the pointer to the created AliMUONHitForRec object | |
268 | // corresponding to this extrapolation. | |
269 | // The caller has the responsibility to delete this object. | |
270 | AliMUONHitForRec* extrapHitForRec = new AliMUONHitForRec(); // creates empty new HitForRec | |
271 | // dZ from first hit of current Segment to chamber | |
272 | AliMUON *pMUON = (AliMUON*) gAlice->GetModule("MUON"); // necessary ???? | |
273 | Double_t dZ = | |
274 | (&(pMUON->Chamber(Chamber)))->Z() - (this->fHitForRecPtr1)->GetZ(); | |
275 | // Data in bending plane | |
276 | // coordinate | |
277 | extrapHitForRec->SetBendingCoor(this->fBendingCoor + this->fBendingSlope * dZ); | |
278 | // covariance, including multiple Coulomb scattering over dZ due to one chamber | |
279 | extrapHitForRec->SetBendingReso2(this->fBendingCoorReso2 + | |
280 | (this->fBendingSlopeReso2 + MCSfactor) * dZ * dZ); // missing non diagonal term: "2.0 * this->fBendingCoorSlopeReso2 * dZ" !!!! | |
281 | // Data in non bending plane | |
282 | // coordinate | |
283 | extrapHitForRec ->SetNonBendingCoor(this->fNonBendingCoor + | |
284 | this->fNonBendingSlope * dZ); | |
285 | // covariance, including multiple Coulomb scattering over dZ due to one chamber | |
286 | extrapHitForRec-> | |
287 | SetNonBendingReso2(this->fNonBendingCoorReso2 + | |
288 | (this->fNonBendingSlopeReso2 + MCSfactor) * dZ * dZ); // missing non diagonal term: "2.0 * this->fNonBendingCoorSlopeReso2 * dZ" !!!! | |
289 | return extrapHitForRec; | |
290 | } | |
291 | ||
292 | //__________________________________________________________________________ | |
04b5ea16 | 293 | void AliMUONSegment::UpdateFromStationTrackParam(AliMUONTrackParam *TrackParam, Double_t MCSfactor, Double_t Dz1, Double_t Dz2, Double_t Dz3, Int_t Station, Double_t InverseMomentum) |
a9e2aefa | 294 | { |
295 | // Fill data members with values calculated from the array of track parameters | |
296 | // pointed to by "TrackParam" (index = 0 and 1 for first and second chambers | |
297 | // of the station, respectively). | |
298 | // Multiple Coulomb scattering is taking into account with "MCSfactor" | |
299 | // corresponding to one chamber, | |
300 | // with one chamber for the coordinate, two chambers for the angle, | |
301 | // due to the arrangement in stations. | |
302 | // Resolution coming from: | |
04b5ea16 | 303 | // coordinate in closest station at "Dz1" from current "Station", |
a9e2aefa | 304 | // slope between closest stations, with "Dz2" interval between them, |
04b5ea16 | 305 | // interval "Dz3" between chambers of closest station, |
306 | // extrapolation over "Dz1" from closest station, | |
307 | // "InverseMomentum". | |
a9e2aefa | 308 | // When called, "fBendingCoorReso2" and "fNonBendingCoorReso2" |
309 | // are assumed to be filled | |
310 | // with the variance on bending and non bending coordinates. | |
04b5ea16 | 311 | // The "road" is parametrized from the old reco_muon.F |
312 | // with 8 cm between stations. | |
a9e2aefa | 313 | AliMUONTrackParam *param0; |
d0bfce8d | 314 | // Double_t cReso2, sReso2; |
04b5ea16 | 315 | // parameters to define the widths of the searching roads in station 0,1,2 |
316 | // width = p0 + p1/ (momentum)^2 | |
317 | // station number: 0 1 2 | |
d0bfce8d | 318 | // static Double_t p0BendingCoor[3] = { 6.43e-2, 1.64e-2, 0.034 }; |
319 | // static Double_t p1BendingCoor[3] = { 986., 821., 446. }; | |
320 | // static Double_t p0BendingSlope[3] = { 3.54e-6, 3.63e-6, 3.6e-6 }; | |
321 | // static Double_t p1BendingSlope[3] = { 4.49e-3, 4.8e-3, 0.011 }; | |
322 | // static Double_t p0NonBendingCoor[3] = { 4.66e-2, 4.83e-2, 0.049 }; | |
323 | // static Double_t p1NonBendingCoor[3] = { 1444., 866., 354. }; | |
324 | // static Double_t p0NonBendingSlope[3] = { 6.14e-4, 6.49e-4, 6.85e-4 }; | |
325 | // static Double_t p1NonBendingSlope[3] = { 0., 0., 0. }; | |
326 | ||
327 | static Double_t p0BendingCoor[3] = { 6.43e-2, 6.43e-2, 6.43e-2 }; | |
328 | static Double_t p1BendingCoor[3] = { 986., 986., 986. }; | |
329 | static Double_t p0BendingSlope[3] = { 3.6e-6, 3.6e-6, 3.6e-6 }; | |
330 | static Double_t p1BendingSlope[3] = { 1.1e-2, 1.1e-2, 1.1e-2 }; | |
331 | static Double_t p0NonBendingCoor[3] = { 0.049, 0.049, 0.049 }; | |
332 | static Double_t p1NonBendingCoor[3] = { 1444., 1444., 1444. }; | |
333 | static Double_t p0NonBendingSlope[3] = { 6.8e-4, 6.8e-4, 6.8e-4 }; | |
334 | static Double_t p1NonBendingSlope[3] = { 0., 0., 0. }; | |
a9e2aefa | 335 | param0 = &(TrackParam[0]); |
04b5ea16 | 336 | |
337 | // OLD version | |
338 | // // Bending plane | |
339 | // fBendingCoor = param0->GetBendingCoor(); // coordinate | |
340 | // fBendingSlope = param0->GetBendingSlope(); // slope | |
341 | // cReso2 = fBendingCoorReso2; | |
342 | // sReso2 = 2.0 * cReso2 / Dz2 / Dz2; | |
343 | // fBendingCoorReso2 = cReso2 + (sReso2 + MCSfactor) * Dz1 * Dz1; | |
344 | // fBendingSlopeReso2 = sReso2 + 2.0 * MCSfactor; | |
345 | // // Non bending plane | |
346 | // fNonBendingCoor = param0->GetNonBendingCoor(); // coordinate | |
347 | // fNonBendingSlope = param0->GetNonBendingSlope(); // slope | |
348 | // cReso2 = fNonBendingCoorReso2; | |
349 | // sReso2 = 2.0 * cReso2 / Dz2 / Dz2; | |
350 | // fNonBendingCoorReso2 = cReso2 + (sReso2 + MCSfactor) * Dz1 * Dz1; | |
351 | // fNonBendingSlopeReso2 = sReso2 + 2.0 * MCSfactor; | |
352 | ||
353 | // Coordinate and slope | |
a9e2aefa | 354 | // Bending plane |
355 | fBendingCoor = param0->GetBendingCoor(); // coordinate | |
356 | fBendingSlope = param0->GetBendingSlope(); // slope | |
a9e2aefa | 357 | // Non bending plane |
358 | fNonBendingCoor = param0->GetNonBendingCoor(); // coordinate | |
359 | fNonBendingSlope = param0->GetNonBendingSlope(); // slope | |
04b5ea16 | 360 | |
361 | // Resolutions | |
362 | // cReso2 and sReso2 have to be subtracted here from the parametrization | |
363 | // because they are added in the functions "NormalizedChi2WithSegment" | |
364 | // and "NormalizedChi2WithHitForRec" | |
365 | // Bending plane | |
d0bfce8d | 366 | // cReso2 = fBendingCoorReso2; |
367 | // sReso2 = (2. * cReso2 )/ (Dz3*Dz3) ; | |
368 | fBendingCoorReso2 = p0BendingCoor[Station] + p1BendingCoor[Station]*InverseMomentum*InverseMomentum ; // - cReso2 | |
369 | fBendingSlopeReso2 = p0BendingSlope[Station] + p1BendingSlope[Station]*InverseMomentum*InverseMomentum; // - sReso2; | |
04b5ea16 | 370 | // Non bending plane |
d0bfce8d | 371 | // cReso2 = fNonBendingCoorReso2; |
372 | // sReso2 = (2. * cReso2 )/ (Dz3*Dz3) ; | |
373 | fNonBendingCoorReso2 = p0NonBendingCoor[Station] + p1NonBendingCoor[Station]*InverseMomentum*InverseMomentum; // - cReso2; | |
374 | fNonBendingSlopeReso2 = p0NonBendingSlope[Station] + p1NonBendingSlope[Station]*InverseMomentum*InverseMomentum; // - sReso2; | |
a9e2aefa | 375 | return; |
376 | } | |
04b5ea16 | 377 | |
378 | // OLD function, with roads automatically calculated instead from being parametrized | |
379 | // kept because it would be a better solution, | |
380 | // if one can really find the right values. | |
381 | // //__________________________________________________________________________ | |
382 | // void AliMUONSegment::UpdateFromStationTrackParam(AliMUONTrackParam *TrackParam, Double_t MCSfactor, Double_t Dz1, Double_t Dz2) | |
383 | // { | |
384 | // // Fill data members with values calculated from the array of track parameters | |
385 | // // pointed to by "TrackParam" (index = 0 and 1 for first and second chambers | |
386 | // // of the station, respectively). | |
387 | // // Multiple Coulomb scattering is taking into account with "MCSfactor" | |
388 | // // corresponding to one chamber, | |
389 | // // with one chamber for the coordinate, two chambers for the angle, | |
390 | // // due to the arrangement in stations. | |
391 | // // Resolution coming from: | |
392 | // // coordinate in closest station at "Dz1", | |
393 | // // slope between closest stations, with "Dz2" interval between them, | |
394 | // // extrapolation over "Dz" from closest station. | |
395 | // // When called, "fBendingCoorReso2" and "fNonBendingCoorReso2" | |
396 | // // are assumed to be filled | |
397 | // // with the variance on bending and non bending coordinates. | |
398 | // AliMUONTrackParam *param0; | |
399 | // Double_t cReso2, sReso2; | |
400 | // param0 = &(TrackParam[0]); | |
401 | // // Bending plane | |
402 | // fBendingCoor = param0->GetBendingCoor(); // coordinate | |
403 | // fBendingSlope = param0->GetBendingSlope(); // slope | |
404 | // cReso2 = fBendingCoorReso2; | |
405 | // sReso2 = 2.0 * cReso2 / Dz2 / Dz2; | |
406 | // fBendingCoorReso2 = cReso2 + (sReso2 + MCSfactor) * Dz1 * Dz1; | |
407 | // fBendingSlopeReso2 = sReso2 + 2.0 * MCSfactor; | |
408 | // // Non bending plane | |
409 | // fNonBendingCoor = param0->GetNonBendingCoor(); // coordinate | |
410 | // fNonBendingSlope = param0->GetNonBendingSlope(); // slope | |
411 | // cReso2 = fNonBendingCoorReso2; | |
412 | // sReso2 = 2.0 * cReso2 / Dz2 / Dz2; | |
413 | // fNonBendingCoorReso2 = cReso2 + (sReso2 + MCSfactor) * Dz1 * Dz1; | |
414 | // fNonBendingSlopeReso2 = sReso2 + 2.0 * MCSfactor; | |
415 | // return; | |
416 | // } |