1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
16 // Static function member which can be used in standalone cases
17 // especially as utils for AliTPCCosmicTrackfit
19 // detailed description can be found inside individual function
21 // grep "error" in output log to check abnormal termination
25 // lu@physi.uni-heidelberg.de
33 #include <TTreeStream.h>
36 #include "AliAnalysisManager.h"
37 #include "AliESDEvent.h"
38 #include "AliESDfriend.h"
39 #include "AliESDtrack.h"
40 #include "AliESDfriendTrack.h"
41 #include "AliESDInputHandler.h"
42 #include "AliTPCseed.h"
43 #include "AliTrackerBase.h"
44 #include "AliTrackPointArray.h"
46 #include "AliTPCCosmicUtils.h"
48 Int_t AliTPCCosmicUtils::GetBField(const AliESDEvent *esd)
51 //get b-field in unit of kg, expect 1, 2, 5kg only
53 const Double_t dm = esd->GetMagneticField();
57 mag = (Int_t) (dm+0.5);
59 mag = (Int_t) (dm-0.5);
61 if(TMath::Abs(mag)!=1 && TMath::Abs(mag)!=2 && TMath::Abs(mag)!=5){
62 printf("error AliTPCCosmicUtils::GetB strange Bfield! %f %d\n", dm, mag); exit(1);
68 Int_t AliTPCCosmicUtils::GetTrigger(const AliESDEvent *esd)
73 const TString strig = esd->GetFiredTriggerClasses();
76 if( strig.Contains("C0OB0"))
78 if( strig.Contains("C0OB1"))
80 if( strig.Contains("C0HWU"))
82 if( strig.Contains("CTRDCO2"))
84 if( strig.Contains("AMU"))
86 if( strig.Contains("SCO"))
92 Bool_t AliTPCCosmicUtils::GetESD(AliESDEvent *& esdevent, AliESDfriend *& esdfriend)
95 //get esdevent and esdfriend
101 AliESDInputHandler *esdH = dynamic_cast<AliESDInputHandler *>(AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler());
103 esdevent = esdH->GetEvent();
107 printf("AliAnalysisTaskdEdxCosmic::GetESD error No ESD Event\n");
111 esdH->SetActiveBranches("ESDfriend*");
112 esdfriend = (AliESDfriend *)esdevent->FindListObject("AliESDfriend");
115 printf("AliAnalysisTaskdEdxCosmic::GetESD error No ESD friend\n");
119 esdevent->SetESDfriend(esdfriend);
125 Double_t AliTPCCosmicUtils::GetMinPhi(const AliExternalTrackParam *params[])
128 //minimum phi angle of the two tracks, 0: horizontal
130 const Double_t fsp[] = {TMath::Abs(TMath::Sin(params[0]->Phi())),
131 TMath::Abs(TMath::Sin(params[1]->Phi()))};
132 const Double_t minphi = TMath::ASin(TMath::Min(fsp[0], fsp[1])) * TMath::RadToDeg();
137 Double_t AliTPCCosmicUtils::Point2LineDist(const TVector3 p0, const TVector3 l1, const TVector3 l2, TVector3 *vtx)
140 //return distance of p0 to line (l2-l1)
143 const TVector3 va = p0 - l1;
144 const TVector3 vb = l2 - l1;
146 //calculate vtx position
147 const Double_t ca = va.Dot(vb)/vb.Mag();
148 const TVector3 imp = l1 + vb.Unit()*ca;
154 /* equivalent to imp.Mag()
156 const TVector3 dd = va.Cross(vb);
157 return dd.Mag()/vb.Mag();
163 Double_t AliTPCCosmicUtils::AngleInRange(Double_t phi)
166 //get the phi value (in rad) in -pi ~ pi, so that fabs() works naiively
168 const Double_t pmin = -TMath::Pi();
169 const Double_t pmax = pmin+TMath::TwoPi();
172 phi+= TMath::TwoPi();
175 phi-= TMath::TwoPi();
180 Bool_t AliTPCCosmicUtils::RotateSafe(AliExternalTrackParam *trackPar, const Double_t rawalpha)
182 //1. in AliExternalTrackParam::GetXYZ
183 //r[0]=fX; r[1]=fP[0]; r[2]=fP[1];
184 //return Local2GlobalPosition(r,fAlpha);
185 //in AliVParticle::Local2GlobalMomentum
186 //Double_t cs=TMath::Cos(alpha), sn=TMath::Sin(alpha);
187 //Double_t r=TMath::Sqrt((1. - p[1])*(1. + p[1]));
188 //p[0]=pt*(r*cs - p[1]*sn); p[1]=pt*(p[1]*cs + r*sn); p[2]=pt*p[2];
189 //which is cos(phi_local=Snp+fAlpha) > 0 always.
190 //2. also in Bool_t AliExternalTrackParam::Rotate(Double_t alpha)
191 // Double_t sf=fP2, cf=TMath::Sqrt((1.- fP2)*(1.+fP2));
192 //in AliExternalTrackParam::Set
193 //mom.RotateZ(-fAlpha);
194 //fP[2] = TMath::Sin(mom.Phi());
195 //since only sin is used for mom.Phi(), that is assuming cos(mom.Phi())>0
197 //the range-changing in AliExternalTrackParam::Rotate not precise enough
198 const Double_t aa = AngleInRange(rawalpha);
200 const Double_t a0 = trackPar->GetAlpha();
201 const Double_t p2 = trackPar->GetParameter()[2];
203 //copied from AliExternalTrackParam::Rotate
204 const Double_t ca=TMath::Cos(aa-a0), sa=TMath::Sin(aa-a0);
205 const Double_t sf=p2, cf=TMath::Sqrt((1.- p2)*(1.+p2));
207 if((cf*ca+sf*sa)<0) {
211 return trackPar->Rotate(aa);
214 Double_t xyz[3], pxpypz[3];
215 trackPar->GetXYZ(xyz);
216 trackPar->GetPxPyPz(pxpypz);
217 const TVector3 pos0(xyz);
218 const TVector3 mom0(pxpypz);
219 TVector3 pos1, mom1, dpos, dmom;
220 const Double_t eps = 1e-6;
221 AliExternalTrackParam tmppar = (*trackPar);
223 if(!tmppar.Rotate(aa)){
228 tmppar.GetPxPyPz(pxpypz);
229 pos1.SetXYZ(xyz[0], xyz[1], xyz[2]);
230 mom1.SetXYZ(pxpypz[0], pxpypz[1], pxpypz[2]);
233 if(dpos.Mag()<eps && dmom.Mag()<eps){
243 tmppar = (*trackPar);
244 if(!tmppar.Rotate(aa+TMath::Pi())){
249 tmppar.GetPxPyPz(pxpypz);
250 pos1.SetXYZ(xyz[0], xyz[1], xyz[2]);
251 mom1.SetXYZ(pxpypz[0], pxpypz[1], pxpypz[2]);
254 if(dpos.Mag()<eps && dmom.Mag()<eps){
263 void AliTPCCosmicUtils::PrintTrackParam(const Int_t id, const AliExternalTrackParam * trackpar, const char *tag)
266 //print out TrackParam
268 Double_t xyz[3]={-999,-999,-999};
269 trackpar->GetXYZ(xyz);
270 Double_t pxpypz[3]={-999,-999,-999};
271 trackpar->GetPxPyPz(pxpypz);
273 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());
276 void AliTPCCosmicUtils::DrawTracks(AliESDtrack *esdtrks[], const TString tag, const TString outputformat)
281 const AliTPCseed *seeds[]={GetTPCseed(esdtrks[0]), GetTPCseed(esdtrks[1])};
282 DrawSeeds(seeds, tag, outputformat);
286 void AliTPCCosmicUtils::DrawSeeds(const AliTPCseed * seeds[], const TString tag, const TString outputformat)
289 //draw seed and output to file
292 if(!seeds[0] || !seeds[1])
295 TGraph *grsyx[]={new TGraph, new TGraph};
296 TGraph *grsyz[]={new TGraph, new TGraph};
298 for(Int_t itrk=0; itrk<2; itrk++){
303 for(Int_t irow=0; irow<NRow(); irow++){
304 const AliTPCclusterMI * cls = seeds[itrk]->GetClusterPointer(irow);
308 Float_t xyz[3]={-999,-999,-999};
309 cls->GetGlobalXYZ(xyz);
310 //printf("Test %f %f %f \n", xyz[0], xyz[1], xyz[2]);
311 grsyx[itrk]->SetPoint(ncl, xyz[0], xyz[1]);
312 grsyz[itrk]->SetPoint(ncl, xyz[2], xyz[1]);
317 grsyx[0]->SetTitle(tag);
318 grsyx[0]->SetMaximum(250);
319 grsyx[0]->SetMinimum(-250);
320 grsyx[0]->GetXaxis()->SetLimits(-250,250);
321 grsyx[0]->GetXaxis()->SetTitle("X (cm)");
322 grsyx[0]->GetYaxis()->SetTitle("Y (cm)");
324 grsyx[0]->SetMarkerStyle(20);
325 grsyx[0]->SetMarkerColor(kRed);
326 grsyx[1]->SetMarkerStyle(22);
327 grsyx[1]->SetMarkerColor(kBlue);
329 grsyz[0]->SetTitle(tag);
330 grsyz[0]->SetMaximum(250);
331 grsyz[0]->SetMinimum(-250);
332 grsyz[0]->GetXaxis()->SetLimits(-250,250);
333 grsyz[0]->GetXaxis()->SetTitle("Z (cm)");
334 grsyz[0]->GetYaxis()->SetTitle("Y (cm)");
336 grsyz[0]->SetMarkerStyle(20);
337 grsyz[0]->SetMarkerColor(kRed);
338 grsyz[1]->SetMarkerStyle(22);
339 grsyz[1]->SetMarkerColor(kBlue);
341 TCanvas *cc=new TCanvas("cc","",1200,600);
344 for(int itrk=0; itrk<2; itrk++){
345 grsyx[itrk]->SetMarkerSize(1);
346 grsyx[itrk]->Draw(itrk?"lp same":"alp");
349 for(int itrk=0; itrk<2; itrk++){
350 grsyz[itrk]->SetMarkerSize(1);
351 grsyz[itrk]->Draw(itrk?"lp same":"alp");
354 gErrorIgnoreLevel = 1001;
355 cc->Print(Form("drawTrack%s.%s", tag.Data(), outputformat.Data()));
357 for(Int_t ii=0; ii<2; ii++){
364 //================================================================================================
365 AliTPCseed * AliTPCCosmicUtils::GetTPCseed(const AliESDtrack *esdtrack)
368 //Get TPC seeds from ESDfriendTrack
371 AliESDfriendTrack * friendtrk = (AliESDfriendTrack *) esdtrack->GetFriendTrack();
373 //printf("AliTPCCosmicUtils::GetTPCseed no friend track!\n"); exit(1);
377 TObject *calibObject=0x0;
378 AliTPCseed *tseed = 0x0;
379 for(Int_t l=0; (calibObject=friendtrk->GetCalibObject(l)); l++) {
380 if( (tseed=dynamic_cast<AliTPCseed*>(calibObject)) )
386 //================================================================================================
387 AliExternalTrackParam *AliTPCCosmicUtils::MakeSeed(const AliTPCseed *tseed)
390 //make seed for propagation of TrackParam, using np = 3 outer clusters (separated by deltancls clusters) in TPCseed
393 const Int_t rowstart = NRow()-1;
394 const Int_t rowstop = 0;
395 const Int_t drow = -1;
399 AliTrackPoint *tpos[np];
400 for(Int_t ii=0; ii<np; ii++)
403 const Float_t cov[6]={0,0,0, 0.01*0.01 ,0, 0.01*0.01};
408 const Int_t deltancls = NclsMin()/2-1;
409 Int_t oldcl = -deltancls;
411 for(Int_t irow=rowstart; drow*irow<=drow*rowstop; irow+=drow){
412 AliTPCclusterMI *cls = tseed->GetClusterPointer(irow);
417 if( icl == (oldcl+deltancls) ){
419 cls->GetGlobalXYZ(txyz);
420 tpos[npos++] = new AliTrackPoint(txyz, cov, 0);
421 //printf("------ %d %f %f %f\n", npos, txyz[0], txyz[1], txyz[2]);
429 for(Int_t ii=0; ii<npos; ii++)
435 AliExternalTrackParam * trackparam = AliTrackerBase::MakeSeed(*(tpos[0]), *(tpos[1]), *(tpos[2]));
436 if(!trackparam || trackparam->Pt()==0){
437 for(Int_t ii=0; ii<npos; ii++)
446 Double_t sxyz[3]={-999,-999,-999}, spxpypz[3]={-999,-999,-999};
447 trackparam->GetXYZ(sxyz);
448 trackparam->GetPxPyPz(spxpypz);
450 Int_t sign = trackparam->Charge();
452 //reset covariance matrix -- necessary, otherwise bad fitting result: trackparam->GetCovariance()[ii] has problem: some are strange values
453 for(Int_t ii=0; ii<21; ii++) {
456 trackparam->Set(sxyz, spxpypz, scov, sign);
458 for(Int_t ii=0; ii<np; ii++)
464 //================================================================================================
465 void AliTPCCosmicUtils::IniCov(AliExternalTrackParam *trackPar, const Double_t ncl)
468 //initialize covariance matrix
471 const Double_t ksigma=5.;
473 for (Int_t i=0;i<15;i++)
476 acov[0]=ksigma*ksigma;
477 acov[2]=ksigma*ksigma;
478 acov[5]=ksigma*ksigma;
479 acov[9]=ksigma*ksigma;
482 acov[5] = ksigma*ksigma/(ncl*ncl);
483 acov[9] = ksigma*ksigma/(ncl*ncl);
485 const Double_t resetcov = 4;
487 trackPar->ResetCovariance(resetcov);
488 //the following helps a lot!!
489 trackPar->AddCovariance(acov);
492 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)
497 //kinward is the true geometry of the track. Incomming track: 1; outgoing track: 0
498 const Double_t inde = kinward? -1 : 1;
499 const Double_t outde = kinward? 1 : -1;
501 //PrintTrackParam(9000, trackOutOld);
503 AliExternalTrackParam trackOut = *trackOutOld;
504 AliExternalTrackParam trackIn;
507 //nmiss is from the 2 FitKernel of the last iteration
508 //nfit, pchi2 is from the last FitKernel of the last iteration
510 Int_t rowouter = NRow()-1-rowstartshift;
512 //so that when reversed, the same rows are read! important!!!
513 Int_t rowinner = rowouter - rowouter/rowstep * rowstep;
520 for(Int_t ii=0; ii<Niter(); ii++){
523 gposStart.SetXYZ(-999,-999,-999);
526 FitKernel(&trackIn, tseed, rowouter, rowinner, -rowstep, xmin, xmax, inde , ksite, nfit, nmiss, pchi2, gposStart, gposStop, 0x0, kTRUE);
527 //PrintTrackParam(9010+ii, &trackIn);
529 dpos = gposStart-gposStop;
532 //---------------------------
537 gposStart.SetXYZ(-999,-999,-999);
540 FitKernel(&trackOut, tseed, rowinner, rowouter, rowstep, xmin, xmax, outde, ksite, nfit, nmiss, pchi2, gposStart, gposStop, (ii==Niter()-1 ? debugstreamer : 0x0), kTRUE);
541 //PrintTrackParam(90020+ii, &trackOut);
543 dpos = gposStart-gposStop;
550 (*trackInOld) = trackIn;
552 (*trackOutOld) = trackOut;
555 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)
558 //combined propagation
561 //seen from 1/pt_fit - 1/pt_gen, for differnt de:
562 //u+d+: combUp good, combLow bad
563 //u+d-: combUp good, combLow good
564 //u-d-: combUp bad, combLow good
565 //u-d+: combUp bad, combLow bad
566 const Double_t upde = 1;
567 const Double_t lowde = -1;
569 AliExternalTrackParam trackLow = *(trackPars[1]);
570 AliExternalTrackParam trackUp;
572 for(Int_t ii=0; ii<Niter(); ii++){
576 Double_t tmpl = -999, tmpd = -999, tmpz = -999;
580 SubCombined(&trackUp, seeds, 1, 0, rowstartshift, rowstep, xmin, xmax, upde, nfit, nmiss, pchi2, tmpl, tmpd, tmpz);
587 SubCombined(&trackLow, seeds, 0, 1, rowstartshift, rowstep, xmin, xmax, lowde, nfit, nmiss, pchi2, tmpl, tmpd, tmpz, (ii==Niter()-1? debugstreamer : 0x0));
593 *(trackPars[0]) = trackUp;
594 *(trackPars[1]) = trackLow;
596 //only last iteration used
602 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)
605 //sub-routine for combined propagation
608 IniCov(trackPar, seeds[0]->GetNumberOfClusters()+seeds[1]->GetNumberOfClusters());
622 //always nrow -> 1 -> nrow
623 Int_t rowstart= NRow()-1-rowstartshift;
625 //so that when reversed, the same rows are read! important!!!
626 Int_t rowstop = rowstart - rowstart/rowstep * rowstep;
627 Int_t drow = -rowstep;
629 TVector3 gposStart(-999,-999,-999);
630 TVector3 gposStop(-999,-999,-999);
632 for(Int_t itrk=tk0; dtk*itrk<=dtk*tk1; itrk+=dtk){
634 Int_t tmprow = rowstart;
640 FitKernel(trackPar, seeds[itrk], rowstart, rowstop, drow, xmin, xmax, eloss, ksite, nfit, nmiss, pchi2, gposStart, gposStop, debugstreamer, kFALSE);
642 //get the impact parameters at the end of the first propagation (X=0)
644 AliExternalTrackParam vertex(*trackPar);
645 const Double_t maxStep = 1;
646 const Bool_t rotateTo = kFALSE;
647 const Double_t maxSnp = 0.8;
648 if(AliTrackerBase::PropagateTrackToBxByBz(&vertex, 0, Mass(), maxStep, rotateTo, maxSnp, (Int_t)eloss)){
649 vtxD = TMath::Abs(vertex.GetParameter()[0]);
650 vtxZ = vertex.GetParameter()[1];
655 TVector3 dpos = gposStart-gposStop;
659 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)
662 //routine for propagation
665 //only for SingleFit-->
667 IniCov(trackPar, tseed->GetNumberOfClusters());
670 Int_t checkstop = -999;
672 for(Int_t irow=rowstart; drow*irow<=drow*rowstop; irow+=drow){
674 //printf("test irow %d\n", irow);
676 AliTPCclusterMI *cl=tseed->GetClusterPointer(irow);
678 if (cl->GetX()< XMin()) continue;
680 //cut on cluster X (i.e. r) to specify leverarm
681 if(cl->GetX()< xmin){
684 if(cl->GetX()> xmax){
687 //if propagation not successful, trackPar is not changed
688 AliExternalTrackParam tmppar(*trackPar);
690 //--------------------------- to cure large chi2 in z, 2011-05-11. Thandks to M. Ivanov! ---------------------------
691 const Int_t tmpsite = ((cl->GetDetector()%36)<18);
692 if(tmpsite!=ksite && ksite!=-999){
693 Double_t *clscov=(Double_t*)tmppar.GetCovariance();
698 //--------------------------- rotate cluster position to trackPar position ---------------------------
699 //DO NOT rotate trackPar, there is "bug" in trackparam::rotate!! stay in the initial one defined as alpha = ATan2(posy0,posx0)
701 cl->GetGlobalXYZ(gxyz);
703 const TVector3 gptmp(gxyz[0], gxyz[1], gxyz[2]);
705 TVector3 ptogo(gxyz);
707 //printf("test %d : %f %f %f\n", irow, gxyz[0], gxyz[1], gxyz[2]);
709 const Double_t trkalpha = tmppar.GetAlpha();
710 ptogo.RotateZ(-trkalpha);
711 const Double_t xTogo = ptogo.X();
712 const Double_t yTogo = ptogo.Y();
713 const Double_t zTogo = ptogo.Z();
715 //--------------------------- propagate ---------------------------
716 //AliTrackerBase::PropagateTrackToBxByBz Double_t step = dir*TMath::Min(TMath::Abs(xToGo-xpos), maxStep);
717 const Double_t maxStep = 1;
718 const Bool_t rotateTo = kFALSE;
719 const Double_t maxSnp = 0.8;
721 //eloss critical only for combine fit!!!
722 const Bool_t kpro = AliTrackerBase::PropagateTrackToBxByBz(&tmppar, xTogo, Mass(), maxStep, rotateTo, maxSnp, (Int_t)eloss);
728 //--------------------------- set error ---------------------------
729 //necessary, help at mostly low p, and also high p
730 Double_t cov[3]={0.01, 0., 0.01};
731 AliTPCseed::GetError(cl, &tmppar, cov[0],cov[2]);
736 TVector3 tmpgxyz(gxyz);
737 (*debugstreamer)<<"ErrParam"<<
747 //--------------------------- get chi2 and THEN update ---------------------------
748 Double_t yz[2]={yTogo, zTogo};
750 pchi2 += tmppar.GetPredictedChi2(yz, cov);
752 tmppar.Update(yz,cov);
754 //--------------------------- save change ---------------------------
755 (*trackPar) = tmppar;
760 if(gposStart.X()<-998)
764 //to make sure rowstart and rowstop are the actual ending
765 if(checkstop != rowstop){
766 printf("AliTPCCosmicUtils::FitKernel error wrong rowstart, stop, drow!! %d %d %d\n", rowstart, rowstop, drow); exit(1);