]>
Commit | Line | Data |
---|---|---|
1f30d65c | 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 | // | |
15d37333 | 16 | // Static function member which can be used in standalone cases |
17 | // especially as utils for AliTPCCosmicTrackfit | |
18 | // | |
19 | // detailed description can be found inside individual function | |
1f30d65c | 20 | // |
21 | // grep "exitreport" in output log to check abnormal termination | |
1f30d65c | 22 | // |
15d37333 | 23 | // |
24 | // Xianguo Lu | |
25 | // lu@physi.uni-heidelberg.de | |
26 | // Xianguo.Lu@cern.ch | |
27 | ||
1f30d65c | 28 | // |
29 | ||
30 | #include <TAxis.h> | |
31 | #include <TCanvas.h> | |
32 | #include <TGraph.h> | |
33 | #include <TTreeStream.h> | |
34 | #include <TVector3.h> | |
35 | ||
36 | #include "AliESDtrack.h" | |
37 | #include "AliESDfriendTrack.h" | |
38 | #include "AliTPCseed.h" | |
39 | #include "AliTrackerBase.h" | |
40 | #include "AliTrackPointArray.h" | |
41 | ||
42 | #include "AliTPCCosmicUtils.h" | |
43 | ||
15d37333 | 44 | Double_t AliTPCCosmicUtils::Point2LineDist(const TVector3 p0, const TVector3 l1, const TVector3 l2) |
45 | { | |
46 | // | |
47 | //return distance of p0 to line (l2-l1) | |
48 | // | |
49 | ||
50 | const TVector3 va = p0 - l1; | |
51 | const TVector3 vb = l2 - l1; | |
52 | ||
53 | const TVector3 dd = va.Cross(vb); | |
54 | ||
55 | return dd.Mag()/vb.Mag(); | |
56 | } | |
57 | ||
58 | Double_t AliTPCCosmicUtils::AngleInRange(Double_t phi) | |
59 | { | |
60 | // | |
61 | //get the phi value (in rad) in -pi ~ pi, so that fabs() works naiively | |
62 | // | |
63 | const Double_t pmin = -TMath::Pi(); | |
64 | const Double_t pmax = pmin+TMath::TwoPi(); | |
65 | ||
66 | while(phi<pmin) | |
67 | phi+= TMath::TwoPi(); | |
68 | ||
69 | while(phi>=pmax) | |
70 | phi-= TMath::TwoPi(); | |
71 | ||
72 | return phi; | |
73 | } | |
74 | ||
75 | Bool_t AliTPCCosmicUtils::RotateSafe(AliExternalTrackParam *trackPar, const Double_t rawalpha) | |
1f30d65c | 76 | { |
77 | //1. in AliExternalTrackParam::GetXYZ | |
78 | //r[0]=fX; r[1]=fP[0]; r[2]=fP[1]; | |
79 | //return Local2GlobalPosition(r,fAlpha); | |
80 | //in AliVParticle::Local2GlobalMomentum | |
81 | //Double_t cs=TMath::Cos(alpha), sn=TMath::Sin(alpha); | |
82 | //Double_t r=TMath::Sqrt((1. - p[1])*(1. + p[1])); | |
83 | //p[0]=pt*(r*cs - p[1]*sn); p[1]=pt*(p[1]*cs + r*sn); p[2]=pt*p[2]; | |
84 | //which is cos(phi_local=Snp+fAlpha) > 0 always. | |
85 | //2. also in Bool_t AliExternalTrackParam::Rotate(Double_t alpha) | |
86 | // Double_t sf=fP2, cf=TMath::Sqrt((1.- fP2)*(1.+fP2)); | |
87 | //in AliExternalTrackParam::Set | |
88 | //mom.RotateZ(-fAlpha); | |
89 | //fP[2] = TMath::Sin(mom.Phi()); | |
90 | //since only sin is used for mom.Phi(), that is assuming cos(mom.Phi())>0 | |
91 | ||
15d37333 | 92 | //the range-changing in AliExternalTrackParam::Rotate not precise enough |
93 | const Double_t aa = AngleInRange(rawalpha); | |
94 | ||
95 | const Double_t a0 = trackPar->GetAlpha(); | |
96 | const Double_t p2 = trackPar->GetParameter()[2]; | |
97 | ||
98 | //copied from AliExternalTrackParam::Rotate | |
99 | const Double_t ca=TMath::Cos(aa-a0), sa=TMath::Sin(aa-a0); | |
100 | const Double_t sf=p2, cf=TMath::Sqrt((1.- p2)*(1.+p2)); | |
101 | ||
102 | if((cf*ca+sf*sa)<0) { | |
103 | return kFALSE; | |
104 | } | |
105 | ||
106 | return trackPar->Rotate(aa); | |
107 | ||
108 | /* | |
1f30d65c | 109 | Double_t xyz[3], pxpypz[3]; |
110 | trackPar->GetXYZ(xyz); | |
111 | trackPar->GetPxPyPz(pxpypz); | |
112 | const TVector3 pos0(xyz); | |
113 | const TVector3 mom0(pxpypz); | |
114 | TVector3 pos1, mom1, dpos, dmom; | |
115 | const Double_t eps = 1e-6; | |
116 | AliExternalTrackParam tmppar = (*trackPar); | |
117 | ||
118 | if(!tmppar.Rotate(aa)){ | |
119 | return 0; | |
120 | } | |
121 | ||
122 | tmppar.GetXYZ(xyz); | |
123 | tmppar.GetPxPyPz(pxpypz); | |
124 | pos1.SetXYZ(xyz[0], xyz[1], xyz[2]); | |
125 | mom1.SetXYZ(pxpypz[0], pxpypz[1], pxpypz[2]); | |
126 | dpos = pos1-pos0; | |
127 | dmom = mom1-mom0; | |
128 | if(dpos.Mag()<eps && dmom.Mag()<eps){ | |
129 | (*trackPar)=tmppar; | |
130 | return 1; | |
131 | } | |
132 | else | |
133 | return 0; | |
15d37333 | 134 | */ |
1f30d65c | 135 | |
136 | /* | |
137 | //flip | |
138 | tmppar = (*trackPar); | |
139 | if(!tmppar.Rotate(aa+TMath::Pi())){ | |
140 | return 0; | |
141 | } | |
142 | ||
143 | tmppar.GetXYZ(xyz); | |
144 | tmppar.GetPxPyPz(pxpypz); | |
145 | pos1.SetXYZ(xyz[0], xyz[1], xyz[2]); | |
146 | mom1.SetXYZ(pxpypz[0], pxpypz[1], pxpypz[2]); | |
147 | dpos = pos1-pos0; | |
148 | dmom = mom1-mom0; | |
149 | if(dpos.Mag()<eps && dmom.Mag()<eps){ | |
150 | (*trackPar)=tmppar; | |
151 | return -1; | |
152 | } | |
153 | ||
154 | return 0; | |
155 | */ | |
156 | } | |
157 | ||
158 | void AliTPCCosmicUtils::PrintTrackParam(const Int_t id, const AliExternalTrackParam * trackpar, const char *tag) | |
159 | { | |
160 | // | |
161 | //print out TrackParam | |
162 | // | |
163 | Double_t xyz[3]={-999,-999,-999}; | |
164 | trackpar->GetXYZ(xyz); | |
165 | Double_t pxpypz[3]={-999,-999,-999}; | |
166 | trackpar->GetPxPyPz(pxpypz); | |
167 | ||
15d37333 | 168 | printf("PrintTrackPar %2s %3d : %6.1f %5.1f : %6.6f %6.6f %6.6f : %6.6f : %8.3f %8.3f %8.3f : (%2d) %8.3f %11.6f %.2f\n", tag, id, trackpar->GetX(), sqrt(pow(xyz[0],2)+pow(xyz[1],2)), xyz[0], xyz[1], xyz[2], trackpar->Phi(), pxpypz[0], pxpypz[1], pxpypz[2], trackpar->Charge(), trackpar->Pt(), trackpar->P(), trackpar->GetAlpha()*TMath::RadToDeg()); |
169 | } | |
170 | ||
171 | void AliTPCCosmicUtils::DrawTracks(AliESDtrack *esdtrks[], const TString tag, const TString outputformat) | |
172 | { | |
173 | // | |
174 | //draw esdtracks | |
175 | // | |
176 | const AliTPCseed *seeds[]={GetTPCseed(esdtrks[0]), GetTPCseed(esdtrks[1])}; | |
177 | DrawSeeds(seeds, tag, outputformat); | |
1f30d65c | 178 | } |
179 | ||
15d37333 | 180 | |
1f30d65c | 181 | void AliTPCCosmicUtils::DrawSeeds(const AliTPCseed * seeds[], const TString tag, const TString outputformat) |
182 | { | |
183 | // | |
184 | //draw seed and output to file | |
185 | // | |
15d37333 | 186 | |
187 | if(!seeds[0] || !seeds[1]) | |
188 | return; | |
189 | ||
1f30d65c | 190 | TGraph *grsyx[]={new TGraph, new TGraph}; |
191 | TGraph *grsyz[]={new TGraph, new TGraph}; | |
192 | ||
193 | for(Int_t itrk=0; itrk<2; itrk++){ | |
194 | if(!seeds[itrk]) | |
195 | continue; | |
196 | ||
197 | Int_t ncl = 0; | |
198 | for(Int_t irow=0; irow<fgkNRow; irow++){ | |
199 | const AliTPCclusterMI * cls = seeds[itrk]->GetClusterPointer(irow); | |
200 | if(!cls) | |
201 | continue; | |
202 | ||
203 | Float_t xyz[3]={-999,-999,-999}; | |
204 | cls->GetGlobalXYZ(xyz); | |
205 | //printf("Test %f %f %f \n", xyz[0], xyz[1], xyz[2]); | |
206 | grsyx[itrk]->SetPoint(ncl, xyz[0], xyz[1]); | |
207 | grsyz[itrk]->SetPoint(ncl, xyz[2], xyz[1]); | |
208 | ncl++; | |
209 | } | |
210 | } | |
211 | ||
212 | grsyx[0]->SetTitle(tag); | |
213 | grsyx[0]->SetMaximum(250); | |
214 | grsyx[0]->SetMinimum(-250); | |
215 | grsyx[0]->GetXaxis()->SetLimits(-250,250); | |
216 | grsyx[0]->GetXaxis()->SetTitle("X (cm)"); | |
217 | grsyx[0]->GetYaxis()->SetTitle("Y (cm)"); | |
218 | ||
219 | grsyx[0]->SetMarkerStyle(20); | |
220 | grsyx[0]->SetMarkerColor(kRed); | |
221 | grsyx[1]->SetMarkerStyle(22); | |
222 | grsyx[1]->SetMarkerColor(kBlue); | |
223 | ||
224 | grsyz[0]->SetTitle(tag); | |
225 | grsyz[0]->SetMaximum(250); | |
226 | grsyz[0]->SetMinimum(-250); | |
227 | grsyz[0]->GetXaxis()->SetLimits(-250,250); | |
228 | grsyz[0]->GetXaxis()->SetTitle("Z (cm)"); | |
229 | grsyz[0]->GetYaxis()->SetTitle("Y (cm)"); | |
230 | ||
231 | grsyz[0]->SetMarkerStyle(20); | |
232 | grsyz[0]->SetMarkerColor(kRed); | |
233 | grsyz[1]->SetMarkerStyle(22); | |
234 | grsyz[1]->SetMarkerColor(kBlue); | |
235 | ||
236 | TCanvas *cc=new TCanvas("cc","",1200,600); | |
237 | cc->Divide(2); | |
238 | cc->cd(1); | |
239 | for(int itrk=0; itrk<2; itrk++){ | |
240 | grsyx[itrk]->SetMarkerSize(1); | |
241 | grsyx[itrk]->Draw(itrk?"lp same":"alp"); | |
242 | } | |
243 | cc->cd(2); | |
244 | for(int itrk=0; itrk<2; itrk++){ | |
245 | grsyz[itrk]->SetMarkerSize(1); | |
246 | grsyz[itrk]->Draw(itrk?"lp same":"alp"); | |
247 | } | |
15d37333 | 248 | |
249 | gErrorIgnoreLevel = 1001; | |
1f30d65c | 250 | cc->Print(Form("drawTrack%s.%s", tag.Data(), outputformat.Data())); |
251 | ||
252 | for(Int_t ii=0; ii<2; ii++){ | |
253 | delete grsyx[ii]; | |
254 | delete grsyz[ii]; | |
255 | } | |
256 | delete cc; | |
257 | } | |
258 | ||
259 | //================================================================================================ | |
260 | AliTPCseed * AliTPCCosmicUtils::GetTPCseed(const AliESDtrack *esdtrack) | |
261 | { | |
262 | // | |
263 | //Get TPC seeds from ESDfriendTrack | |
264 | // | |
265 | ||
266 | AliESDfriendTrack * friendtrk = (AliESDfriendTrack *) esdtrack->GetFriendTrack(); | |
267 | if(!friendtrk){ | |
268 | printf("exitreport AliTPCCosmicUtils::GetTPCseed no friend track!\n"); | |
269 | exit(1); | |
270 | } | |
271 | ||
272 | TObject *calibObject=0x0; | |
273 | AliTPCseed *tseed = 0x0; | |
274 | for(Int_t l=0; (calibObject=friendtrk->GetCalibObject(l)); l++) { | |
275 | if( (tseed=dynamic_cast<AliTPCseed*>(calibObject)) ) | |
276 | break; | |
277 | } | |
278 | return tseed; | |
279 | } | |
280 | ||
281 | //================================================================================================ | |
282 | AliExternalTrackParam *AliTPCCosmicUtils::MakeSeed(const AliTPCseed *tseed) | |
283 | { | |
284 | // | |
285 | //make seed for propagation of TrackParam, using np = 3 outer clusters (separated by deltancls clusters) in TPCseed | |
286 | // | |
287 | ||
288 | const Int_t rowstart = fgkNRow-1; | |
289 | const Int_t rowstop = 0; | |
290 | const Int_t drow = -1; | |
291 | ||
292 | //--- | |
293 | const Int_t np = 3; | |
294 | AliTrackPoint *tpos[np]; | |
295 | for(Int_t ii=0; ii<np; ii++) | |
296 | tpos[ii] = 0x0; | |
297 | ||
298 | const Float_t cov[6]={0,0,0, 0.01*0.01 ,0, 0.01*0.01}; | |
299 | ||
300 | //--- | |
301 | Int_t npos = 0; | |
302 | Int_t icl = 0; | |
303 | const Int_t deltancls = fgkNclsMin/2-1; | |
304 | Int_t oldcl = -deltancls; | |
305 | ||
306 | for(Int_t irow=rowstart; drow*irow<=drow*rowstop; irow+=drow){ | |
307 | AliTPCclusterMI *cls = tseed->GetClusterPointer(irow); | |
308 | if(!cls) { | |
309 | continue; | |
310 | } | |
311 | ||
312 | if( icl == (oldcl+deltancls) ){ | |
313 | Float_t txyz[3]; | |
314 | cls->GetGlobalXYZ(txyz); | |
315 | tpos[npos++] = new AliTrackPoint(txyz, cov, 0); | |
316 | //printf("------ %d %f %f %f\n", npos, txyz[0], txyz[1], txyz[2]); | |
317 | ||
318 | oldcl = icl; | |
319 | if(npos==np) break; | |
320 | } | |
321 | icl++; | |
322 | } | |
323 | if(npos!=np){ | |
324 | for(Int_t ii=0; ii<npos; ii++) | |
325 | delete tpos[ii]; | |
326 | ||
327 | return 0x0; | |
328 | } | |
329 | ||
330 | AliExternalTrackParam * trackparam = AliTrackerBase::MakeSeed(*(tpos[0]), *(tpos[1]), *(tpos[2])); | |
331 | if(!trackparam || trackparam->Pt()==0){ | |
332 | for(Int_t ii=0; ii<npos; ii++) | |
333 | delete tpos[ii]; | |
334 | delete trackparam; | |
335 | ||
336 | return 0x0; | |
337 | } | |
338 | ||
339 | //------ | |
340 | ||
341 | Double_t sxyz[3]={-999,-999,-999}, spxpypz[3]={-999,-999,-999}; | |
342 | trackparam->GetXYZ(sxyz); | |
343 | trackparam->GetPxPyPz(spxpypz); | |
344 | Double_t scov[21]; | |
345 | Int_t sign = trackparam->Charge(); | |
346 | ||
347 | //reset covariance matrix -- necessary, otherwise bad fitting result: trackparam->GetCovariance()[ii] has problem: some are strange values | |
348 | for(Int_t ii=0; ii<21; ii++) { | |
349 | scov[ii]=0; | |
350 | } | |
351 | trackparam->Set(sxyz, spxpypz, scov, sign); | |
352 | ||
353 | for(Int_t ii=0; ii<np; ii++) | |
354 | delete tpos[ii]; | |
355 | ||
356 | return trackparam; | |
357 | } | |
358 | ||
359 | //================================================================================================ | |
360 | void AliTPCCosmicUtils::IniCov(AliExternalTrackParam *trackPar, const Double_t ncl) | |
361 | { | |
362 | // | |
363 | //initialize covariance matrix | |
364 | // | |
365 | ||
366 | const Double_t ksigma=5.; | |
367 | Double_t acov[16]; | |
368 | for (Int_t i=0;i<15;i++) | |
369 | acov[i]=0; | |
370 | ||
371 | acov[0]=ksigma*ksigma; | |
372 | acov[2]=ksigma*ksigma; | |
373 | acov[5]=ksigma*ksigma; | |
374 | acov[9]=ksigma*ksigma; | |
375 | acov[14]=0.2*0.2; | |
376 | ||
377 | acov[5] = ksigma*ksigma/(ncl*ncl); | |
378 | acov[9] = ksigma*ksigma/(ncl*ncl); | |
379 | ||
380 | const Double_t resetcov = 4; | |
381 | ||
382 | trackPar->ResetCovariance(resetcov); | |
383 | //the following helps a lot!! | |
384 | trackPar->AddCovariance(acov); | |
385 | } | |
386 | ||
15d37333 | 387 | void AliTPCCosmicUtils::SingleFit(AliExternalTrackParam * trackInOld, AliExternalTrackParam * trackOutOld, const AliTPCseed *tseed, const Bool_t kinward, const Int_t rowstartshift, const Int_t rowstep, const Double_t xmin, const Double_t xmax, Int_t &nfit, Int_t &nmiss, Double_t &pchi2, Double_t &lfit, TTreeSRedirector *debugstreamer) |
1f30d65c | 388 | { |
389 | // | |
390 | //fit single track | |
391 | // | |
392 | //kinward is the true geometry of the track. Incomming track: 1; outgoing track: 0 | |
393 | const Double_t inde = kinward? -1 : 1; | |
394 | const Double_t outde = kinward? 1 : -1; | |
395 | ||
396 | //PrintTrackParam(9000, trackOutOld); | |
397 | ||
398 | AliExternalTrackParam trackOut = *trackOutOld; | |
399 | AliExternalTrackParam trackIn; | |
400 | Int_t ksite = -999; | |
401 | ||
402 | //nmiss is from the 2 FitKernel of the last iteration | |
403 | //nfit, pchi2 is from the last FitKernel of the last iteration | |
15d37333 | 404 | |
405 | Int_t rowouter = fgkNRow-1-rowstartshift; | |
406 | ||
407 | //so that when reversed, the same rows are read! important!!! | |
408 | Int_t rowinner = rowouter - rowouter/rowstep * rowstep; | |
409 | ||
410 | TVector3 gposStart; | |
411 | TVector3 gposStop; | |
412 | TVector3 dpos; | |
413 | lfit = 0; | |
414 | ||
1f30d65c | 415 | for(Int_t ii=0; ii<fgkNiter; ii++){ |
416 | nmiss = 0; | |
417 | ||
15d37333 | 418 | gposStart.SetXYZ(-999,-999,-999); |
1f30d65c | 419 | ksite = -999; |
420 | trackIn = trackOut; | |
15d37333 | 421 | FitKernel(&trackIn, tseed, rowouter, rowinner, -rowstep, xmin, xmax, inde , ksite, nfit, nmiss, pchi2, gposStart, gposStop, 0x0, kTRUE); |
422 | //PrintTrackParam(9010+ii, &trackIn); | |
423 | ||
424 | dpos = gposStart-gposStop; | |
425 | lfit += dpos.Pt(); | |
426 | ||
427 | //--------------------------- | |
1f30d65c | 428 | |
429 | nfit = 0; | |
430 | pchi2 = 0; | |
431 | ||
15d37333 | 432 | gposStart.SetXYZ(-999,-999,-999); |
1f30d65c | 433 | ksite = -999; |
434 | trackOut = trackIn; | |
15d37333 | 435 | FitKernel(&trackOut, tseed, rowinner, rowouter, rowstep, xmin, xmax, outde, ksite, nfit, nmiss, pchi2, gposStart, gposStop, (ii==fgkNiter-1 ? debugstreamer : 0x0), kTRUE); |
1f30d65c | 436 | //PrintTrackParam(90020+ii, &trackOut); |
15d37333 | 437 | |
438 | dpos = gposStart-gposStop; | |
439 | lfit += dpos.Pt(); | |
1f30d65c | 440 | } |
441 | ||
15d37333 | 442 | lfit /= 2.*fgkNiter; |
443 | ||
1f30d65c | 444 | if(trackInOld) |
445 | (*trackInOld) = trackIn; | |
446 | ||
447 | (*trackOutOld) = trackOut; | |
448 | } | |
449 | ||
15d37333 | 450 | void AliTPCCosmicUtils::CombinedFit(AliExternalTrackParam *trackPars[], const AliTPCseed *seeds[], const Int_t rowstartshift, const Int_t rowstep, const Double_t xmin, const Double_t xmax, Int_t &nfit, Int_t &nmiss, Double_t &pchi2, Double_t &lfit, Double_t &vtxD, Double_t &vtxZ, TTreeSRedirector *debugstreamer) |
1f30d65c | 451 | { |
452 | // | |
453 | //combined propagation | |
454 | // | |
455 | ||
456 | //seen from 1/pt_fit - 1/pt_gen, for differnt de: | |
457 | //u+d+: combUp good, combLow bad | |
458 | //u+d-: combUp good, combLow good | |
459 | //u-d-: combUp bad, combLow good | |
460 | //u-d+: combUp bad, combLow bad | |
461 | const Double_t upde = 1; | |
462 | const Double_t lowde = -1; | |
463 | ||
464 | AliExternalTrackParam trackLow = *(trackPars[1]); | |
465 | AliExternalTrackParam trackUp; | |
466 | ||
467 | for(Int_t ii=0; ii<fgkNiter; ii++){ | |
15d37333 | 468 | lfit = 0; |
469 | vtxD = 0; | |
470 | vtxZ = 0; | |
471 | Double_t tmpl = -999, tmpd = -999, tmpz = -999; | |
1f30d65c | 472 | |
473 | //lower->upper | |
474 | trackUp = trackLow; | |
15d37333 | 475 | SubCombined(&trackUp, seeds, 1, 0, rowstartshift, rowstep, xmin, xmax, upde, nfit, nmiss, pchi2, tmpl, tmpd, tmpz); |
476 | lfit += tmpl; | |
477 | vtxD += tmpd; | |
478 | vtxZ += tmpz; | |
1f30d65c | 479 | |
1f30d65c | 480 | //upper->lower |
481 | trackLow = trackUp; | |
15d37333 | 482 | SubCombined(&trackLow, seeds, 0, 1, rowstartshift, rowstep, xmin, xmax, lowde, nfit, nmiss, pchi2, tmpl, tmpd, tmpz, (ii==fgkNiter-1? debugstreamer : 0x0)); |
483 | lfit += tmpl; | |
484 | vtxD += tmpd; | |
485 | vtxZ += tmpz; | |
1f30d65c | 486 | } |
487 | ||
488 | *(trackPars[0]) = trackUp; | |
489 | *(trackPars[1]) = trackLow; | |
15d37333 | 490 | |
491 | //only last iteration used | |
492 | lfit /= 2; | |
493 | vtxD /= 2; | |
494 | vtxZ /= 2; | |
1f30d65c | 495 | } |
496 | ||
15d37333 | 497 | void AliTPCCosmicUtils::SubCombined(AliExternalTrackParam *trackPar, const AliTPCseed *seeds[], const Int_t tk0, const Int_t tk1, const Int_t rowstartshift, const Int_t rowstep, const Double_t xmin, const Double_t xmax, const Double_t eloss, Int_t &nfit, Int_t &nmiss, Double_t &pchi2, Double_t &lfit, Double_t &vtxD, Double_t &vtxZ, TTreeSRedirector *debugstreamer) |
1f30d65c | 498 | { |
499 | // | |
500 | //sub-routine for combined propagation | |
501 | // | |
502 | ||
503 | IniCov(trackPar, seeds[0]->GetNumberOfClusters()+seeds[1]->GetNumberOfClusters()); | |
504 | ||
505 | Int_t dtk=1; | |
506 | if(tk0>tk1) | |
507 | dtk=-1; | |
508 | ||
509 | //reset counters | |
510 | Int_t ksite = -999; | |
511 | nfit = 0; | |
512 | nmiss = 0; | |
513 | pchi2 = 0; | |
15d37333 | 514 | vtxD = -1e10; |
515 | vtxZ = -1e10; | |
1f30d65c | 516 | |
517 | //always nrow -> 1 -> nrow | |
15d37333 | 518 | Int_t rowstart= fgkNRow-1-rowstartshift; |
519 | ||
520 | //so that when reversed, the same rows are read! important!!! | |
521 | Int_t rowstop = rowstart - rowstart/rowstep * rowstep; | |
522 | Int_t drow = -rowstep; | |
523 | ||
524 | TVector3 gposStart(-999,-999,-999); | |
525 | TVector3 gposStop(-999,-999,-999); | |
526 | ||
1f30d65c | 527 | for(Int_t itrk=tk0; dtk*itrk<=dtk*tk1; itrk+=dtk){ |
528 | if(itrk==tk1){ | |
529 | Int_t tmprow = rowstart; | |
530 | rowstart = rowstop; | |
531 | rowstop = tmprow; | |
15d37333 | 532 | drow *= -1; |
533 | } | |
534 | ||
535 | FitKernel(trackPar, seeds[itrk], rowstart, rowstop, drow, xmin, xmax, eloss, ksite, nfit, nmiss, pchi2, gposStart, gposStop, debugstreamer, kFALSE); | |
536 | ||
537 | //get the impact parameters at the end of the first propagation (X=0) | |
538 | if(itrk==tk0){ | |
539 | AliExternalTrackParam vertex(*trackPar); | |
540 | const Double_t maxStep = 1; | |
541 | const Bool_t rotateTo = kFALSE; | |
542 | const Double_t maxSnp = 0.8; | |
543 | if(AliTrackerBase::PropagateTrackToBxByBz(&vertex, 0, fgkMass, maxStep, rotateTo, maxSnp, eloss)){ | |
544 | vtxD = TMath::Abs(vertex.GetParameter()[0]); | |
545 | vtxZ = vertex.GetParameter()[1]; | |
546 | } | |
1f30d65c | 547 | } |
1f30d65c | 548 | } |
15d37333 | 549 | |
550 | TVector3 dpos = gposStart-gposStop; | |
551 | lfit = dpos.Pt(); | |
1f30d65c | 552 | } |
553 | ||
15d37333 | 554 | void AliTPCCosmicUtils::FitKernel(AliExternalTrackParam *trackPar, const AliTPCseed *tseed, const Int_t rowstart, const Int_t rowstop, const Int_t drow, const Double_t xmin, const Double_t xmax, const Double_t eloss, Int_t &ksite, Int_t &nfit, Int_t &nmiss, Double_t &pchi2, TVector3 &gposStart, TVector3 &gposStop, TTreeSRedirector *debugstreamer, const Bool_t kinicov) |
1f30d65c | 555 | { |
556 | // | |
557 | //routine for propagation | |
558 | // | |
559 | ||
560 | //only for SingleFit--> | |
561 | if(kinicov) | |
562 | IniCov(trackPar, tseed->GetNumberOfClusters()); | |
563 | //<-- | |
564 | ||
15d37333 | 565 | Int_t checkstop = -999; |
1f30d65c | 566 | |
567 | for(Int_t irow=rowstart; drow*irow<=drow*rowstop; irow+=drow){ | |
15d37333 | 568 | checkstop = irow; |
569 | //printf("test irow %d\n", irow); | |
1f30d65c | 570 | |
571 | AliTPCclusterMI *cl=tseed->GetClusterPointer(irow); | |
572 | if (!cl) continue; | |
573 | if (cl->GetX()< fgkXMin) continue; | |
574 | ||
15d37333 | 575 | //cut on cluster X (i.e. r) to specify leverarm |
576 | if(cl->GetX()< xmin){ | |
577 | continue; | |
578 | } | |
579 | if(cl->GetX()> xmax){ | |
580 | continue; | |
581 | } | |
1f30d65c | 582 | //if propagation not successful, trackPar is not changed |
583 | AliExternalTrackParam tmppar(*trackPar); | |
584 | ||
585 | //--------------------------- to cure large chi2 in z, 2011-05-11. Thandks to M. Ivanov! --------------------------- | |
586 | const Int_t tmpsite = ((cl->GetDetector()%36)<18); | |
587 | if(tmpsite!=ksite && ksite!=-999){ | |
588 | Double_t *clscov=(Double_t*)tmppar.GetCovariance(); | |
589 | clscov[2]+=3*3; | |
590 | } | |
591 | ksite = tmpsite; | |
592 | ||
593 | //--------------------------- rotate cluster position to trackPar position --------------------------- | |
594 | //DO NOT rotate trackPar, there is "bug" in trackparam::rotate!! stay in the initial one defined as alpha = ATan2(posy0,posx0) | |
595 | Float_t gxyz[3]; | |
596 | cl->GetGlobalXYZ(gxyz); | |
15d37333 | 597 | |
598 | const TVector3 gptmp(gxyz[0], gxyz[1], gxyz[2]); | |
599 | ||
1f30d65c | 600 | TVector3 ptogo(gxyz); |
601 | ||
602 | //printf("test %d : %f %f %f\n", irow, gxyz[0], gxyz[1], gxyz[2]); | |
603 | ||
604 | const Double_t trkalpha = tmppar.GetAlpha(); | |
605 | ptogo.RotateZ(-trkalpha); | |
606 | const Double_t xTogo = ptogo.X(); | |
607 | const Double_t yTogo = ptogo.Y(); | |
608 | const Double_t zTogo = ptogo.Z(); | |
609 | ||
610 | //--------------------------- propagate --------------------------- | |
611 | //AliTrackerBase::PropagateTrackToBxByBz Double_t step = dir*TMath::Min(TMath::Abs(xToGo-xpos), maxStep); | |
612 | const Double_t maxStep = 1; | |
613 | const Bool_t rotateTo = kFALSE; | |
614 | const Double_t maxSnp = 0.8; | |
615 | ||
616 | //eloss critical only for combine fit!!! | |
617 | const Bool_t kpro = AliTrackerBase::PropagateTrackToBxByBz(&tmppar, xTogo, fgkMass, maxStep, rotateTo, maxSnp, eloss); | |
618 | if(!kpro){ | |
619 | nmiss++; | |
620 | continue; | |
621 | } | |
622 | ||
623 | //--------------------------- set error --------------------------- | |
624 | //necessary, help at mostly low p, and also high p | |
625 | Double_t cov[3]={0.01, 0., 0.01}; | |
626 | AliTPCseed::GetError(cl, &tmppar, cov[0],cov[2]); | |
627 | cov[0]*=cov[0]; | |
628 | cov[2]*=cov[2]; | |
629 | ||
630 | if(debugstreamer){ | |
631 | TVector3 tmpgxyz(gxyz); | |
632 | (*debugstreamer)<<"ErrParam"<< | |
633 | "Cl.="<<cl<< | |
634 | "T.="<<&tmppar<< | |
635 | "covy="<<cov[0]<< | |
636 | "covz="<<cov[2]<< | |
637 | "clpos.="<<&ptogo<< | |
638 | "gpos.="<<&tmpgxyz<< | |
639 | "\n"; | |
640 | } | |
641 | ||
642 | //--------------------------- get chi2 and THEN update --------------------------- | |
643 | Double_t yz[2]={yTogo, zTogo}; | |
644 | ||
645 | pchi2 += tmppar.GetPredictedChi2(yz, cov); | |
646 | ||
647 | tmppar.Update(yz,cov); | |
648 | ||
649 | //--------------------------- save change --------------------------- | |
650 | (*trackPar) = tmppar; | |
651 | ||
652 | nfit++; | |
15d37333 | 653 | |
654 | gposStop = gptmp; | |
655 | if(gposStart.X()<-998) | |
656 | gposStart = gptmp; | |
657 | } | |
658 | ||
659 | //to make sure rowstart and rowstop are the actual ending | |
660 | if(checkstop != rowstop){ | |
661 | printf("exitreport AliTPCCosmicUtils::FitKernel wrong rowstart, stop, drow!! %d %d %d\n", rowstart, rowstop, drow); | |
662 | exit(1); | |
1f30d65c | 663 | } |
664 | } |