7 #include <TObjectTable.h>
9 #include "AliITStracking.h"
12 #include "AliITSgeom.h"
13 #include "AliITSRecPoint.h"
14 #include "AliITStrack.h"
16 ClassImp(AliITStracking)
19 AliITStracking::AliITStracking(TList *trackITSlist, AliITStrack *reference,
20 AliITS *aliITS, TObjArray *rpoints, Double_t Ptref, Int_t **vettid, Bool_t flagvert) {
21 /////////////////////// This function perform the tracking in ITS detectors /////////////////////
22 /////////////////////// reference is a pointer to the final best track /////////////////////
23 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
24 // The authors thank Mariana Bondila to have help them to resolve some problems. July-2000
26 Rlayer[0]=4.; Rlayer[1]=7.; Rlayer[2]=14.9; Rlayer[3]=23.8; Rlayer[4]=39.1; Rlayer[5]=43.6;
29 for(index =0; index<trackITSlist->GetSize(); index++) {
30 AliITStrack *trackITS = (AliITStrack *) trackITSlist->At(index);
32 if((*trackITS).GetLayer()==7) reference->SetChi2(10.223e140);
33 // cout <<" Layer inizio = "<<(*trackITS).GetLayer()<<"\n";
34 // cout<<"fvtrack =" <<"\n";
35 // cout << (*trackITS)(0) << " "<<(*trackITS)(1)<<" "<<(*trackITS)(2)<<" "<<(*trackITS)(3)<<" "<<(*trackITS)(4)<<"\n";
36 // cout<< " rtrack = "<<(*trackITS).Getrtrack()<<"\n";
37 // cout<< " Pt = "<<(*trackITS).GetPt()<<"\n";
39 Double_t Chi2Now, Chi2Ref;
40 if((*trackITS).GetLayer()==1 ) {
41 Chi2Now = trackITS->GetChi2();
42 Float_t NumClustNow = trackITS->GetNumClust();
43 if(trackITS->GetNumClust()) Chi2Now /= (Double_t )trackITS->GetNumClust();
44 Chi2Ref = reference->GetChi2();
45 Float_t NumClustRef = reference->GetNumClust();
46 if(reference->GetNumClust()) Chi2Ref /= (Double_t )reference->GetNumClust();
47 //cout<<" Chi2Now and Chi2Ref = "<<Chi2Now<<" "<<Chi2Ref<<"\n";
48 if( NumClustNow > NumClustRef ) {*reference = *trackITS;}
49 if((NumClustNow == NumClustRef )&& (Chi2Now < Chi2Ref)) {*reference = *trackITS;}
52 Float_t NumClustNow = trackITS->GetNumClust();
54 Chi2Now = trackITS->GetChi2();
56 //cout<<" Chi2Now = "<<Chi2Now<<"\n";
58 // if(Ptref > 0.6 && Chi2Now > 20.) continue;
59 if(Ptref > 0.6 && Chi2Now > 30.) continue;
60 if((Ptref <= 0.6 && Ptref>0.2)&& Chi2Now > 15.) continue;
61 // if(Chi2Now>5.) continue;
62 //if(Chi2Now>15.) continue;
63 // if(Ptref <= 0.2 && Chi2Now > 10.) continue;
64 if(Ptref <= 0.2 && Chi2Now > 8.) continue;
67 Int_t layerInit = (*trackITS).GetLayer();
68 Int_t layernew = layerInit - 2; // -1 for new layer, -1 for matrix index
70 Int_t NLadder[]= {20, 40, 14, 22, 34, 38};
71 Int_t NDetector[]= {4, 4, 5, 8, 23, 26};
74 Int_t ladp, ladm, detp,detm,ladinters,detinters;
75 Int_t layerfin=layerInit-1;
76 Double_t Rfin=Rlayer[layerfin-1];
77 // cout<<"Prima di intersection \n";
79 Int_t outinters=NewIntersection(*trackITS, Rfin, layerfin, ladinters, detinters);
81 // cout<<" outinters = "<<outinters<<"\n";
82 // cout<<" Layer ladder detector intersection ="<<layerfin<<" "<<ladinters<<" "<<detinters<<"\n";
83 // cout << " phiinters zinters = "<<(*trackITS)(0) << " "<<(*trackITS)(1)<<"\n"; getchar();
85 if(outinters==-1) continue;
89 TVector Touclad(9), Toucdet(9);
93 if(ladm <= 0) ladm=NLadder[layerfin-1];
94 if(ladp > NLadder[layerfin-1]) ladp=1;
98 Touclad(0)=ladinters; Touclad(1)=ladm; Touclad(2)=ladp;
99 Touclad(3)=ladinters; Touclad(4)=ladm; Touclad(5)=ladp;
100 Touclad(6)=ladinters; Touclad(7)=ladm; Touclad(8)=ladp;
101 Toucdet(0)=detinters; Toucdet(1)=detinters; Toucdet(2)=detinters;
102 if(detm > 0 && detp <= NDetector[layerfin-1]) {
104 Toucdet(3)=detm; Toucdet(4)=detm; Toucdet(5)=detm;
105 Toucdet(6)=detp; Toucdet(7)=detp; Toucdet(8)=detp;
108 if(detm > 0 && detp > NDetector[layerfin-1]) {
110 Toucdet(3)=detm; Toucdet(4)=detm; Toucdet(5)=detm;
113 if(detm <= 0 && detp <= NDetector[layerfin-1]) {
115 Toucdet(3)=detp; Toucdet(4)=detp; Toucdet(5)=detp;
118 for (iriv=0; iriv<idetot; iriv++) { //for on detectors
119 AliITSgeom *g1 = aliITS->GetITSgeom();
121 g1->GetCenterThetaPhi(layerInit-1,(Int_t)Touclad(iriv),(Int_t)Toucdet(iriv),CTF);
123 // cout<<" layer, ladder, det, xo, yo, zo = "<<layerInit-1<<" "<<(Int_t)Touclad(iriv)<<
124 // " "<<(Int_t)Toucdet(iriv)<<" "<<CTF(0)<<" "<<CTF(1)<<" "<<CTF(2)<< " "<<CTF(6)<<"\n"; getchar();
126 ////////////////////////////////////////////////////////////////////////////////////////////////
128 /*** Rec points sorted by module *****/
129 /**************************************/
132 AliITSRecPoint *recp;
133 AliITSgeom *geom = aliITS->GetITSgeom();
134 index = geom->GetModuleIndex(lycur,Touclad(iriv),Toucdet(iriv));
136 geom->GetModuleId(index,lay,lad,det);
137 aliITS->ResetRecPoints();
138 //gAlice->TreeR()->GetEvent(index+1); //first entry in TreeR is empty
139 gAlice->TreeR()->GetEvent(index); //first entry in TreeR is empty
141 Int_t npoints=rpoints->GetEntries();
142 Int_t *indlist=new Int_t[npoints+1];
145 for (ind=0; ind<=npoints; ind++) {
147 if (*(vettid[index]+ind)==0) {
148 indlist[counter]=ind;
157 if(indlist[ind] < 0) recp=0;
158 else recp = (AliITSRecPoint*)rpoints->UncheckedAt(indlist[ind]);
161 TVector cluster(3),vecclust(9);
162 vecclust(6)=vecclust(7)=vecclust(8)=-1.;
164 // set veclust in global
165 Float_t global[3], local[3];
166 local[0]=recp->GetX();
168 local[2]= recp->GetZ();
169 AliITSgeom *g1 = aliITS->GetITSgeom();
171 Int_t plad = TMath::Nint(Touclad(iriv));
172 Int_t pdet = TMath::Nint(Toucdet(iriv));
173 g1->LtoG(play,plad,pdet,local,global);
175 vecclust(0)=global[0];
176 vecclust(1)=global[1];
177 vecclust(2)=global[2];
178 vecclust(3) = (float)recp->fTracks[0];
179 vecclust(4) = (float)indlist[ind];
180 vecclust(5) = (float)index;
181 vecclust(6) = (float)recp->fTracks[0];
182 vecclust(7) = (float)recp->fTracks[1];
183 vecclust(8) = (float)recp->fTracks[2];
185 sigma[0] = (Double_t) recp->GetSigmaX2();
186 sigma[1] = (Double_t) recp->GetSigmaZ2();
187 //now we are in r,phi,z in global
188 cluster(0) = TMath::Sqrt(vecclust(0)*vecclust(0)+vecclust(1)*vecclust(1));//r hit
189 cluster(1) = PhiDef(vecclust(0),vecclust(1)); // phi hit
190 cluster(2) = vecclust(2); // z hit
191 // cout<<" layer = "<<play<<"\n";
192 // cout<<" cluster prima = "<<vecclust(0)<<" "<<vecclust(1)<<" "
193 // <<vecclust(2)<<"\n"; getchar();
194 //cluster(1)= cluster(1)-trackITS->Getalphaprov(); //provvisorio;
195 //if(cluster(1)<0.) cluster(1)+=2.*TMath::Pi(); //provvisorio
196 //cout<<" cluster(1) dopo = "<<cluster(1)<< " alphaprov = "<<trackITS->Getalphaprov()<<"\n";
197 Float_t sigmatotphi, sigmatotz;
199 //Float_t epsphi=3.2, epsz=3.;
200 Float_t epsphi=3.2, epsz=3.0;
201 //if(Ptref<0.2) {epsphi=3.; epsz=3.;}
203 Double_t Rtrack=(*trackITS).Getrtrack();
204 Double_t sigmaphi=sigma[0]/(Rtrack*Rtrack);
205 sigmatotphi=epsphi*TMath::Sqrt(sigmaphi + (*trackITS).GetSigmaphi());
207 sigmatotz=epsz*TMath::Sqrt(sigma[1] + (*trackITS).GetSigmaZ());
208 //cout<<"cluster e sigmatotphi e track = "<<cluster(0)<<" "<<cluster(1)<<" "<<sigmatotphi<<" "<<vecclust(3)<<"\n";
209 //if(vecclust(3)==481) getchar();
210 if(cluster(1)<6. && (*trackITS).Getphi()>6.) cluster(1)=cluster(1)+(2.*TMath::Pi());
211 if(cluster(1)>6. && (*trackITS).Getphi()<6.) cluster(1)=cluster(1)-(2.*TMath::Pi());
212 if(TMath::Abs(cluster(1)-(*trackITS).Getphi()) > sigmatotphi) continue;
213 // cout<<" supero sigmaphi \n";
214 AliITStrack *newTrack = new AliITStrack((*trackITS));
215 (*newTrack).SetLayer((*trackITS).GetLayer()-1);
217 if (TMath::Abs(Rtrack-cluster(0))/Rtrack>1e-6)
218 (*newTrack).Correct(Double_t(cluster(0)));
219 //cout<<" cluster(2) e (*newTrack).GetZ() = "<<cluster(2)<<" "<< (*newTrack).GetZ()<<"\n";
220 if(TMath::Abs(cluster(2)-(*newTrack).GetZ()) > sigmatotz){
224 if(iriv == 0) flaghit=1;
226 (*newTrack).AddMS(); // add the multiple scattering matrix to the covariance matrix
227 (*newTrack).AddEL(1.,0);
229 Double_t sigmanew[2];
230 sigmanew[0]= sigmaphi;
231 sigmanew[1]=sigma[1];
232 //cout<<" Chiamo Kalman \n"; getchar();
235 KalmanFilterVert(newTrack,cluster,sigmanew);
237 KalmanFilter(newTrack,cluster,sigmanew);
240 (*newTrack).PutCluster(layernew, vecclust);
241 newTrack->AddClustInTrack();
243 listoftrack.AddLast(newTrack);
245 } // end of for(;;) on rec points
249 } // end of for on detectors
251 }//end if(outinters==0)
253 if(flaghit==0 || outinters==-2) {
254 AliITStrack *newTrack = new AliITStrack(*trackITS);
255 (*newTrack).SetLayer((*trackITS).GetLayer()-1);
256 (*newTrack).AddMS(); // add the multiple scattering matrix to the covariance matrix
257 (*newTrack).AddEL(1.,0);
259 listoftrack.AddLast(newTrack);
263 //gObjectTable->Print(); // stampa memoria
265 AliITStracking(&listoftrack, reference, aliITS, rpoints,Ptref,vettid,flagvert);
266 listoftrack.Delete();
267 } // end of for on tracks
269 //gObjectTable->Print(); // stampa memoria
274 Int_t AliITStracking::NewIntersection(AliITStrack &track, Double_t rk,Int_t layer, Int_t &ladder, Int_t &detector) {
275 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
276 // Found the intersection and the detector
278 if(track.DoNotCross(rk)){ /*cout<< " Do not cross \n";*/ return -1;}
279 track.Propagation(rk);
280 Double_t zinters=track.GetZ();
281 Double_t phinters=track.Getphi();
282 //phinters = phinters+track.Getalphaprov(); //provvisorio
283 //if(phinters>2.*3.14) phinters=phinters-2.*3.14; //provvisorio
284 //cout<<"zinters = "<<zinters<<" phinters = "<<phinters<<"\n";
286 ////////////////////////////////// limits for Geometry 5 /////////////////////////////
288 Int_t NLadder[]= {20, 40, 14, 22, 34, 38};
289 Int_t NDetector[]= {4, 4, 5, 8, 23, 26};
291 Float_t Detx[]= {0.64, 0.64, 3.509, 3.509, 3.65, 3.65 };
292 Float_t Detz[]= {4.19, 4.19, 3.75 , 3.75 , 2 , 2 };
293 ////////////////////////////////////////////////////////////////////////////////////////////////
297 TVector DistZCenter(2);
298 AliITSgeom *g1 = ((AliITS*)gAlice->GetDetector("ITS"))->GetITSgeom();
301 Double_t epszpixel=0.05;
304 for(iD = 1; iD<= NDetector[layer-1]; iD++) {
305 g1->GetCenterThetaPhi(layer,1,iD,det);
306 Double_t zmin=det(2)-Detz[layer-1];
307 if(iD==1) zmin=det(2)-(Detz[layer-1])*epsz;
308 Double_t zmax=det(2)+Detz[layer-1];
309 if(iD==NDetector[layer-1]) zmax=det(2)+(Detz[layer-1])*epsz;
310 //added to take into account problem on drift
311 if(layer == 3 || layer==2) zmin=zmin-epszpixel; zmax=zmax+epszpixel;
312 //cout<<"zmin zinters zmax det(2)= "<<zmin<<" "<<zinters<<" "<<zmax<<" "<<det(2)<<"\n";
313 if(zinters > zmin && zinters <= zmax) {
314 if(iz>1) {cout<< " Errore su iz in NewIntersection \n"; getchar();}
316 ListDet(iz)= iD; DistZCenter(iz)=TMath::Abs(zinters-det(2)); iz++;
321 if(iz==0) {/* cout<< " No detector along Z \n";*/ return -2;}
322 detector=Int_t (ListDet(0));
323 if(iz>1 && (DistZCenter(0)>DistZCenter(1))) detector=Int_t (ListDet(1));
325 AliITSgeom *g2 = ((AliITS*)gAlice->GetDetector("ITS"))->GetITSgeom();
329 TVector DistphiCenter(2);
331 Double_t pigre=TMath::Pi();
334 for(iLd = 1; iLd<= NLadder[layer-1]; iLd++) {
335 g1->GetCenterThetaPhi(layer,iLd,detector,det);
336 Double_t phidet=PhiDef(Double_t(det(0)),Double_t(det(1)));
337 // cout<<" layer phidet e det(6) = "<< layer<<" "<<phidet<<" "<<det(6)<<"\n"; getchar();
338 Double_t xmin,ymin,xmax,ymax;
339 // Double_t phiconfr=0.0;
340 //cout<<" phiconfr inizio = "<<phiconfr <<"\n"; getchar();
341 local[1]=local[2]=0.;
342 local[0]= -(Detx[layer-1]);
343 if(layer==1) local[0]= (Detx[layer-1]); //take into account different reference system
344 g2->LtoG(layer,iLd,detector,local,global);
345 xmax=global[0]; ymax=global[1];
346 local[0]= (Detx[layer-1]);
347 if(layer==1) local[0]= -(Detx[layer-1]); //take into account different reference system
348 g2->LtoG(layer,iLd,detector,local,global);
349 xmin=global[0]; ymin=global[1];
350 Double_t phimin=PhiDef(xmin,ymin);
351 Double_t phimax=PhiDef(xmax,ymax);
352 //cout<<" xmin ymin = "<<xmin<<" "<<ymin<<"\n";
353 // cout<<" xmax ymax = "<<xmax<<" "<<ymax<<"\n";
354 // cout<<" iLd phimin phimax ="<<iLd<<" "<<phimin<<" "<<phimax<<"\n";
356 Double_t phiconfr=phinters;
358 if(phimin <5.5) {cout<<" Error in NewIntersection for phi \n"; getchar();}
359 phimin=phimin-(2.*pigre);
360 if(phinters>(1.5*pigre)) phiconfr=phinters-(2.*pigre);
361 if(phidet>(1.5*pigre)) phidet=phidet-(2.*pigre);
363 // cout<<" phiconfr finale = "<<phiconfr<<"\n"; getchar();
364 if(phiconfr>phimin && phiconfr<= phimax) {
366 cout<< " Errore su ip in NewIntersection \n"; getchar();
369 ListLad(ip)= iLd; DistphiCenter(ip)=TMath::Abs(phiconfr-phidet); ip++;
373 if(ip==0) { cout<< " No detector along phi \n"; getchar();}
374 ladder=Int_t (ListLad(0));
375 if(ip>1 && (DistphiCenter(0)>DistphiCenter(1))) ladder=Int_t (ListLad(1));
381 Double_t AliITStracking::PhiDef(Double_t x, Double_t y){
382 Double_t pigre= TMath::Pi();
384 if(y == 0. || x == 0.) {
385 if(y == 0. && x == 0.) {
386 cout << " Error in AliITStracking::PhiDef x=0 and y=0 \n"; getchar();
388 if(y==0. && x>0.) phi=0.;
389 if(y==0. && x<0.) phi=pigre;
390 if(x==0 && y>0.) phi=pigre/2.;
391 if(x==0 && y<0.) phi=1.5*pigre;
394 if (x>0. && y>0.) phi=TMath::ATan(y/x);
395 if (x<0. && y>0.) phi=pigre+TMath::ATan(y/x);
396 if (x<0. && y<0.) phi=pigre+TMath::ATan(y/x);
397 if (x>0. && y<0.) phi=(2.*pigre)+TMath::ATan(y/x);
399 if(phi<0. || phi>(2*pigre)) {
400 cout<<" Error on phi in AliITStracking::PhiDef \n"; getchar();
406 void AliITStracking::KalmanFilter(AliITStrack *newTrack,TVector &cluster,Double_t sigma[2]){
407 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
408 // Kalman filter without vertex constraint
410 TMatrix H(2,5); H.UnitMatrix();
411 TMatrix Ht(TMatrix::kTransposed, H);
414 ////////////////////////////// Evaluation of the measurement vector /////////////////////////////////////
418 rk=cluster(0); phik=cluster(1); zk=cluster(2);
420 // cout<<" r and m = "<<rk<<" "<<m(0)<<" "<<m(1)<<"\n";
421 ///////////////////////////////////// Evaluation of the error matrix V ///////////////////////////////
424 V(0,1)=0.; V(1,0)=0.;
427 ///////////////////////////////////////////////////////////////////////////////////////////
429 TMatrix C=newTrack->GetCMatrix();
430 TMatrix tmp(H,TMatrix::kMult,C);
431 TMatrix R(tmp,TMatrix::kMult,Ht); R+=V;
434 // cout<<" R prima = \n";
435 // R.Print(); getchar();
437 TMatrix K(C,TMatrix::kMult,Ht); K*=R;
439 TVector x=newTrack->GetVector();
443 x*=-1.; x*=K; x+=savex;
445 C.Mult(K,tmp); C-=saveC; C*=-1;
446 newTrack->GetVector()=x;
447 newTrack->GetCMatrix()=C;
449 TVector res= newTrack->GetVector();
450 //cout<<" res = "<<res(0)<<" "<<res(1)<<" "<<res(2)<<" "<<res(3)<<" "<<res(4)<<"\n";
451 res*=H; res-=m; res*=-1.;
452 TMatrix Cn=newTrack->GetCMatrix();
453 TMatrix tmpn(H,TMatrix::kMult,Cn);
454 TMatrix Rn(tmpn,TMatrix::kMult,Ht); Rn-=V; Rn*=-1.;
457 TVector r=res; res*=Rn;
458 //cout<<" R dopo = \n";
459 //Rn.Print(); getchar();
460 Double_t chi2= r*res;
461 //cout<<"chi2 ="<<chi2<<"\n"; getchar();
463 newTrack->SetChi2(newTrack->GetChi2()+chi2);
468 void AliITStracking::KalmanFilterVert(AliITStrack *newTrack,TVector &cluster,Double_t sigma[2]){
469 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
470 // Kalman filter with vertex constraint
471 TMatrix H(4,5); H.UnitMatrix();
472 TMatrix Ht(TMatrix::kTransposed, H);
474 ////////////////////////////// Evaluation of the measurement vector /////////////////////////////////////
478 rk=cluster(0); phik=cluster(1); zk=cluster(2);
481 Double_t CC=(*newTrack).GetC();
482 Double_t Zv=(*newTrack).GetZv();
483 Double_t Dv=(*newTrack).GetDv();
484 // cout<<" Dv e Zv = "<<Dv<<" "<<Zv<<"\n";
486 Double_t tgl= (zk-Zv)*Cy/TMath::ASin(Cy*rk);
489 // cout<<m(0)<<" "<<m(1)<<" "<<m(2)<<" "<<m(3)<<"\n";
490 ///////////////////////////////////// Evaluation of the error matrix V ///////////////////////////////
493 V(0,1)=0.; V(1,0)=0.;
494 Int_t Layer=newTrack->GetLayer();
497 V(1,3)=sigma[1]/rk; V(3,1)=V(1,3);
498 Double_t sigmaDv=newTrack->GetsigmaDv();
499 V(2,2)=sigmaDv*sigmaDv + newTrack->Getd2(Layer-1);
500 V(2,3)=newTrack->Getdtgl(Layer-1); V(3,2)=V(2,3);
501 Double_t sigmaZv=newTrack->GetsigmaZv();
502 V(3,3)=(sigma[1]+sigmaZv*sigmaZv)/(rk*rk) + newTrack->Gettgl2(Layer-1);
503 ///////////////////////////////////////////////////////////////////////////////////////////
505 //cout<<" d2 tgl2 dtgl = "<<newTrack->Getd2(Layer-1)<<" "<<newTrack->Gettgl2(Layer-1)<<" "<<newTrack->Getdtgl(Layer-1)<<"\n";
507 // V.Print(); getchar();
509 TMatrix C=newTrack->GetCMatrix();
513 TMatrix tmp(H,TMatrix::kMult,C);
514 TMatrix R(tmp,TMatrix::kMult,Ht); R+=V;
517 TMatrix K(C,TMatrix::kMult,Ht); K*=R;
518 TVector x=newTrack->GetVector();
521 x*=-1; x*=K; x+=savex;
523 C.Mult(K,tmp); C-=saveC; C*=-1;
525 newTrack->GetVector()=x;
526 newTrack->GetCMatrix()=C;
527 TVector res= newTrack->GetVector();
528 //cout<<" res = "<<res(0)<<" "<<res(1)<<" "<<res(2)<<" "<<res(3)<<" "<<res(4)<<"\n";
529 res*=H; res-=m; res*=-1.;
530 TMatrix Cn=newTrack->GetCMatrix();
531 TMatrix tmpn(H,TMatrix::kMult,Cn);
532 TMatrix Rn(tmpn,TMatrix::kMult,Ht); Rn-=V; Rn*=-1.;
535 TVector r=res; res*=Rn;
536 Double_t chi2= r*res;
538 newTrack->SetChi2(newTrack->GetChi2()+chi2);