6 #include <TObjectTable.h>
8 #include "AliITStracking.h"
11 #include "AliITSgeom.h"
12 #include "AliITSRecPoint.h"
13 #include "AliITStrack.h"
15 ClassImp(AliITStracking)
18 AliITStracking::AliITStracking(TList *trackITSlist, AliITStrack *reference,
19 AliITS *aliITS, TObjArray *rpoints, Double_t Ptref, Int_t **vettid, Bool_t flagvert) {
20 /////////////////////// This function perform the tracking in ITS detectors /////////////////////
21 /////////////////////// reference is a pointer to the final best track /////////////////////
22 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
23 // 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;
28 for(Int_t index =0; index<trackITSlist->GetSize(); index++) {
29 AliITStrack *trackITS = (AliITStrack *) trackITSlist->At(index);
30 if((*trackITS).GetLayer()==7) reference->SetChi2(10.223e140);
31 //cout <<" Layer inizio = "<<(*trackITS).GetLayer()<<"\n";
32 // cout<<"fvtrack =" <<"\n";
33 // cout << (*trackITS)(0) << " "<<(*trackITS)(1)<<" "<<(*trackITS)(2)<<" "<<(*trackITS)(3)<<" "<<(*trackITS)(4)<<"\n";
34 // cout<< " rtrack = "<<(*trackITS).Getrtrack()<<"\n";
36 Double_t Chi2Now, Chi2Ref;
37 if((*trackITS).GetLayer()==1 ) {
38 Chi2Now = trackITS->GetChi2();
39 Float_t NumClustNow = trackITS->GetNumClust();
40 if(trackITS->GetNumClust()) Chi2Now /= (Double_t )trackITS->GetNumClust();
41 Chi2Ref = reference->GetChi2();
42 Float_t NumClustRef = reference->GetNumClust();
43 if(reference->GetNumClust()) Chi2Ref /= (Double_t )reference->GetNumClust();
44 //cout<<" Chi2Now and Chi2Ref = "<<Chi2Now<<" "<<Chi2Ref<<"\n";
45 if( NumClustNow > NumClustRef ) {*reference = *trackITS;}
46 if((NumClustNow == NumClustRef )&& (Chi2Now < Chi2Ref)) {*reference = *trackITS;}
50 Float_t NumClustNow = trackITS->GetNumClust();
52 Chi2Now = trackITS->GetChi2();
54 //cout<<" Chi2Now = "<<Chi2Now<<"\n";
56 // if(Ptref > 0.6 && Chi2Now > 20.) continue;
57 if(Ptref > 0.6 && Chi2Now > 30.) continue;
58 if((Ptref <= 0.6 && Ptref>0.2)&& Chi2Now > 15.) continue;
59 // if(Chi2Now>5.) continue;
60 //if(Chi2Now>15.) continue;
61 // if(Ptref <= 0.2 && Chi2Now > 10.) continue;
62 if(Ptref <= 0.2 && Chi2Now > 8.) continue;
65 Int_t layerInit = (*trackITS).GetLayer();
66 Int_t layernew = layerInit - 2; // -1 for new layer, -1 for matrix index
68 Int_t NLadder[]= {20, 40, 14, 22, 34, 38};
69 Int_t NDetector[]= {4, 4, 5, 8, 23, 26};
72 Int_t ladp, ladm, detp,detm,ladinters,detinters;
73 Int_t layerfin=layerInit-1;
74 Double_t Rfin=Rlayer[layerfin-1];
75 // cout<<"Prima di intersection \n";
76 Int_t outinters=NewIntersection(*trackITS, Rfin, layerfin, ladinters, detinters);
78 // cout<<" outinters = "<<outinters<<"\n";
79 // cout<<" Layer ladder detector intersection ="<<layerfin<<" "<<ladinters<<" "<<detinters<<"\n";
80 // cout << " phiinters zinters = "<<(*trackITS)(0) << " "<<(*trackITS)(1)<<"\n"; getchar();
82 if(outinters==-1) continue;
87 TVector Touclad(9), Toucdet(9);
91 if(ladm <= 0) ladm=NLadder[layerfin-1];
92 if(ladp > NLadder[layerfin-1]) ladp=1;
96 Touclad(0)=ladinters; Touclad(1)=ladm; Touclad(2)=ladp;
97 Touclad(3)=ladinters; Touclad(4)=ladm; Touclad(5)=ladp;
98 Touclad(6)=ladinters; Touclad(7)=ladm; Touclad(8)=ladp;
99 Toucdet(0)=detinters; Toucdet(1)=detinters; Toucdet(2)=detinters;
100 if(detm > 0 && detp <= NDetector[layerfin-1]) {
102 Toucdet(3)=detm; Toucdet(4)=detm; Toucdet(5)=detm;
103 Toucdet(6)=detp; Toucdet(7)=detp; Toucdet(8)=detp;
106 if(detm > 0 && detp > NDetector[layerfin-1]) {
108 Toucdet(3)=detm; Toucdet(4)=detm; Toucdet(5)=detm;
111 if(detm <= 0 && detp <= NDetector[layerfin-1]) {
113 Toucdet(3)=detp; Toucdet(4)=detp; Toucdet(5)=detp;
116 for (Int_t iriv=0; iriv<idetot; iriv++) { //for on detectors
117 AliITSgeom *g1 = aliITS->GetITSgeom();
119 g1->GetCenterThetaPhi(layerInit-1,(Int_t)Touclad(iriv),(Int_t)Toucdet(iriv),CTF);
121 // cout<<" layer, ladder, det, xo, yo, zo = "<<layerInit-1<<" "<<(Int_t)Touclad(iriv)<<
122 // " "<<(Int_t)Toucdet(iriv)<<" "<<CTF(0)<<" "<<CTF(1)<<" "<<CTF(2)<< " "<<CTF(6)<<"\n"; getchar();
124 ////////////////////////////////////////////////////////////////////////////////////////////////
126 /*** Rec points sorted by module *****/
127 /**************************************/
130 AliITSRecPoint *recp;
131 AliITSgeom *geom = aliITS->GetITSgeom();
132 index = geom->GetModuleIndex(lycur,Touclad(iriv),Toucdet(iriv));
134 geom->GetModuleId(index,lay,lad,det);
135 aliITS->ResetRecPoints();
136 gAlice->TreeR()->GetEvent(index+1); //first entry in TreeR is empty
138 Int_t npoints=rpoints->GetEntries();
139 Int_t *indlist=new Int_t[npoints+1];
142 for (ind=0; ind<=npoints; ind++) {
144 if (*(vettid[index]+ind)==0) {
145 indlist[counter]=ind;
153 if(indlist[ind] < 0) recp=0;
154 else recp = (AliITSRecPoint*)rpoints->UncheckedAt(indlist[ind]);
157 TVector cluster(3),vecclust(9);
158 vecclust(6)=vecclust(7)=vecclust(8)=-1.;
160 // set veclust in global
161 Float_t global[3], local[3];
162 local[0]=recp->GetX();
164 local[2]= recp->GetZ();
165 AliITSgeom *g1 = aliITS->GetITSgeom();
167 Int_t plad = TMath::Nint(Touclad(iriv));
168 Int_t pdet = TMath::Nint(Toucdet(iriv));
169 g1->LtoG(play,plad,pdet,local,global);
171 vecclust(0)=global[0];
172 vecclust(1)=global[1];
173 vecclust(2)=global[2];
174 vecclust(3) = (float)recp->fTracks[0];
175 vecclust(4) = (float)indlist[ind];
176 vecclust(5) = (float)index;
177 vecclust(6) = (float)recp->fTracks[0];
178 vecclust(7) = (float)recp->fTracks[1];
179 vecclust(8) = (float)recp->fTracks[2];
181 sigma[0] = (Double_t) recp->GetSigmaX2();
182 sigma[1] = (Double_t) recp->GetSigmaZ2();
184 //now we are in r,phi,z in global
185 cluster(0) = TMath::Sqrt(vecclust(0)*vecclust(0)+vecclust(1)*vecclust(1));//r hit
186 cluster(1) = PhiDef(vecclust(0),vecclust(1)); // phi hit
187 cluster(2) = vecclust(2); // z hit
188 // cout<<" cluster(1) prima = "<<cluster(1)<<"\n";
189 //cluster(1)= cluster(1)-trackITS->Getalphaprov(); //provvisorio;
190 //if(cluster(1)<0.) cluster(1)+=2.*TMath::Pi(); //provvisorio
191 //cout<<" cluster(1) dopo = "<<cluster(1)<< " alphaprov = "<<trackITS->Getalphaprov()<<"\n";
192 Float_t sigmatotphi, sigmatotz;
194 //Float_t epsphi=3.2, epsz=3.;
195 Float_t epsphi=3.2, epsz=3.0;
196 //if(Ptref<0.2) {epsphi=3.; epsz=3.;}
198 Double_t Rtrack=(*trackITS).Getrtrack();
199 Double_t sigmaphi=sigma[0]/(Rtrack*Rtrack);
200 sigmatotphi=epsphi*TMath::Sqrt(sigmaphi + (*trackITS).GetSigmaphi());
201 sigmatotz=epsz*TMath::Sqrt(sigma[1] + (*trackITS).GetSigmaZ());
202 //cout<<"cluster e sigmatotphi e track = "<<cluster(0)<<" "<<cluster(1)<<" "<<sigmatotphi<<" "<<vecclust(3)<<"\n";
203 //if(vecclust(3)==481) getchar();
204 if(cluster(1)<6. && (*trackITS).Getphi()>6.) cluster(1)=cluster(1)+(2.*TMath::Pi());
205 if(cluster(1)>6. && (*trackITS).Getphi()<6.) cluster(1)=cluster(1)-(2.*TMath::Pi());
206 if(TMath::Abs(cluster(1)-(*trackITS).Getphi()) > sigmatotphi) continue;
207 // cout<<" supero sigmaphi \n";
208 AliITStrack *newTrack = new AliITStrack((*trackITS));
209 (*newTrack).SetLayer((*trackITS).GetLayer()-1);
211 if (TMath::Abs(Rtrack-cluster(0))/Rtrack>1e-6)
212 (*newTrack).Correct(Double_t(cluster(0)));
213 //cout<<" cluster(2) e (*newTrack).GetZ() = "<<cluster(2)<<" "<< (*newTrack).GetZ()<<"\n";
214 if(TMath::Abs(cluster(2)-(*newTrack).GetZ()) > sigmatotz){
218 if(iriv == 0) flaghit=1;
220 (*newTrack).AddMS(); // add the multiple scattering matrix to the covariance matrix
221 (*newTrack).AddEL(1.,0);
222 Double_t sigmanew[2];
223 sigmanew[0]= sigmaphi;
224 sigmanew[1]=sigma[1];
225 //cout<<" Chiamo Kalman \n"; getchar();
227 KalmanFilterVert(newTrack,cluster,sigmanew);
229 KalmanFilter(newTrack,cluster,sigmanew);
232 (*newTrack).PutCluster(layernew, vecclust);
233 newTrack->AddClustInTrack();
235 listoftrack.AddLast(newTrack);
237 } // end of for(;;) on rec points
241 } // end of for on detectors
242 }//end if(outinters==0)
244 if(flaghit==0 || outinters==-2) {
245 AliITStrack *newTrack = new AliITStrack(*trackITS);
246 (*newTrack).SetLayer((*trackITS).GetLayer()-1);
247 (*newTrack).AddMS(); // add the multiple scattering matrix to the covariance matrix
248 (*newTrack).AddEL(1.,0);
250 listoftrack.AddLast(newTrack);
254 //gObjectTable->Print(); // stampa memoria
256 AliITStracking(&listoftrack, reference, aliITS, rpoints,Ptref,vettid,flagvert);
257 listoftrack.Delete();
258 } // end of for on tracks
260 //gObjectTable->Print(); // stampa memoria
265 Int_t AliITStracking::NewIntersection(AliITStrack &track, Double_t rk,Int_t layer, Int_t &ladder, Int_t &detector) {
266 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
267 // Found the intersection and the detector
269 if(track.DoNotCross(rk)){ /*cout<< " Do not cross \n";*/ return -1;}
270 track.Propagation(rk);
271 Double_t zinters=track.GetZ();
272 Double_t phinters=track.Getphi();
273 //phinters = phinters+track.Getalphaprov(); //provvisorio
274 //if(phinters>2.*3.14) phinters=phinters-2.*3.14; //provvisorio
275 //cout<<"zinters = "<<zinters<<" phinters = "<<phinters<<"\n";
277 ////////////////////////////////// limits for Geometry 5 /////////////////////////////
279 Int_t NLadder[]= {20, 40, 14, 22, 34, 38};
280 Int_t NDetector[]= {4, 4, 5, 8, 23, 26};
282 Float_t Detx[]= {0.64, 0.64, 3.509, 3.509, 3.65, 3.65 };
283 Float_t Detz[]= {4.19, 4.19, 3.75 , 3.75 , 2 , 2 };
284 ////////////////////////////////////////////////////////////////////////////////////////////////
288 TVector DistZCenter(2);
289 AliITSgeom *g1 = ((AliITS*)gAlice->GetDetector("ITS"))->GetITSgeom();
292 Double_t epszpixel=0.05;
294 for(Int_t iD = 1; iD<= NDetector[layer-1]; iD++) {
295 g1->GetCenterThetaPhi(layer,1,iD,det);
296 Double_t zmin=det(2)-Detz[layer-1];
297 if(iD==1) zmin=det(2)-(Detz[layer-1])*epsz;
298 Double_t zmax=det(2)+Detz[layer-1];
299 if(iD==NDetector[layer-1]) zmax=det(2)+(Detz[layer-1])*epsz;
300 if(layer == 3 || layer==2) zmin=zmin-epszpixel; zmax=zmax+epszpixel;
301 //cout<<"zmin zinters zmax det(2)= "<<zmin<<" "<<zinters<<" "<<zmax<<" "<<det(2)<<"\n";
302 if(zinters > zmin && zinters <= zmax) {
303 if(iz>1) {cout<< " Errore su iz in NewIntersection \n"; getchar();}
305 ListDet(iz)= iD; DistZCenter(iz)=TMath::Abs(zinters-det(2)); iz++;
310 if(iz==0) {/* cout<< " No detector along Z \n";*/ return -2;}
311 detector=Int_t (ListDet(0));
312 if(iz>1 && (DistZCenter(0)>DistZCenter(1))) detector=Int_t (ListDet(1));
314 AliITSgeom *g2 = ((AliITS*)gAlice->GetDetector("ITS"))->GetITSgeom();
318 TVector DistphiCenter(2);
320 Double_t pigre=TMath::Pi();
322 for(Int_t iLd = 1; iLd<= NLadder[layer-1]; iLd++) {
323 g1->GetCenterThetaPhi(layer,iLd,detector,det);
324 Double_t phidet=PhiDef(Double_t(det(0)),Double_t(det(1)));
327 // cout<<" layer phidet e det(6) = "<< layer<<" "<<phidet<<" "<<det(6)<<"\n"; getchar();
328 Double_t xmin,ymin,xmax,ymax;
330 local[1]=local[2]=0.;
331 local[0]= -(Detx[layer-1]);
332 if(layer==1) local[0]= (Detx[layer-1]); //take into account different reference system
333 g2->LtoG(layer,iLd,detector,local,global);
334 xmax=global[0]; ymax=global[1];
335 local[0]= (Detx[layer-1]);
336 if(layer==1) local[0]= -(Detx[layer-1]); //take into account different reference system
337 g2->LtoG(layer,iLd,detector,local,global);
338 xmin=global[0]; ymin=global[1];
339 Double_t phimin=PhiDef(xmin,ymin);
340 Double_t phimax=PhiDef(xmax,ymax);
341 //cout<<" xmin ymin = "<<xmin<<" "<<ymin<<"\n";
342 // cout<<" xmax ymax = "<<xmax<<" "<<ymax<<"\n";
343 // cout<<" iLd phimin phimax ="<<iLd<<" "<<phimin<<" "<<phimax<<"\n"; getchar();
345 if(phimin <5.5) {cout<<" Error in NewIntersection for phi \n"; getchar();}
346 phimin=phimin-(2.*pigre);
347 if(phinters>(1.5*pigre)) phiconfr=phinters-(2.*pigre);
348 if(phidet>(1.5*pigre)) phidet=phidet-(2.*pigre);
350 else phiconfr=phinters;
351 if(phiconfr>phimin && phiconfr<= phimax) {
353 cout<< " Errore su ip in NewIntersection \n"; getchar();
356 ListLad(ip)= iLd; DistphiCenter(ip)=TMath::Abs(phiconfr-phidet); ip++;
360 if(ip==0) { cout<< " No detector along phi \n"; getchar();}
361 ladder=Int_t (ListLad(0));
362 if(ip>1 && (DistphiCenter(0)>DistphiCenter(1))) ladder=Int_t (ListLad(1));
368 Double_t AliITStracking::PhiDef(Double_t x, Double_t y){
369 Double_t pigre= TMath::Pi();
371 if(y == 0. || x == 0.) {
372 if(y == 0. && x == 0.) {
373 cout << " Error in AliITStracking::PhiDef x=0 and y=0 \n"; getchar();
375 if(y==0. && x>0.) phi=0.;
376 if(y==0. && x<0.) phi=pigre;
377 if(x==0 && y>0.) phi=pigre/2.;
378 if(x==0 && y<0.) phi=1.5*pigre;
381 if (x>0. && y>0.) phi=TMath::ATan(y/x);
382 if (x<0. && y>0.) phi=pigre+TMath::ATan(y/x);
383 if (x<0. && y<0.) phi=pigre+TMath::ATan(y/x);
384 if (x>0. && y<0.) phi=(2.*pigre)+TMath::ATan(y/x);
386 if(phi<0. || phi>(2*pigre)) {
387 cout<<" Error on phi in AliITStracking::PhiDef \n"; getchar();
393 void AliITStracking::KalmanFilter(AliITStrack *newTrack,TVector &cluster,Double_t sigma[2]){
394 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
395 // Kalman filter without vertex constraint
397 TMatrix H(2,5); H.UnitMatrix();
398 TMatrix Ht(TMatrix::kTransposed, H);
401 ////////////////////////////// Evaluation of the measurement vector /////////////////////////////////////
405 rk=cluster(0); phik=cluster(1); zk=cluster(2);
407 // cout<<" r and m = "<<rk<<" "<<m(0)<<" "<<m(1)<<"\n";
408 ///////////////////////////////////// Evaluation of the error matrix V ///////////////////////////////
411 V(0,1)=0.; V(1,0)=0.;
414 ///////////////////////////////////////////////////////////////////////////////////////////
416 TMatrix C=newTrack->GetCMatrix();
417 TMatrix tmp(H,TMatrix::kMult,C);
418 TMatrix R(tmp,TMatrix::kMult,Ht); R+=V;
421 // cout<<" R prima = \n";
422 // R.Print(); getchar();
424 TMatrix K(C,TMatrix::kMult,Ht); K*=R;
426 TVector x=newTrack->GetVector();
430 x*=-1.; x*=K; x+=savex;
432 C.Mult(K,tmp); C-=saveC; C*=-1;
433 newTrack->GetVector()=x;
434 newTrack->GetCMatrix()=C;
436 TVector res= newTrack->GetVector();
437 //cout<<" res = "<<res(0)<<" "<<res(1)<<" "<<res(2)<<" "<<res(3)<<" "<<res(4)<<"\n";
438 res*=H; res-=m; res*=-1.;
439 TMatrix Cn=newTrack->GetCMatrix();
440 TMatrix tmpn(H,TMatrix::kMult,Cn);
441 TMatrix Rn(tmpn,TMatrix::kMult,Ht); Rn-=V; Rn*=-1.;
444 TVector r=res; res*=Rn;
445 //cout<<" R dopo = \n";
446 //Rn.Print(); getchar();
447 Double_t chi2= r*res;
448 //cout<<"chi2 ="<<chi2<<"\n"; getchar();
450 newTrack->SetChi2(newTrack->GetChi2()+chi2);
455 void AliITStracking::KalmanFilterVert(AliITStrack *newTrack,TVector &cluster,Double_t sigma[2]){
456 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
457 // Kalman filter with vertex constraint
458 TMatrix H(4,5); H.UnitMatrix();
459 TMatrix Ht(TMatrix::kTransposed, H);
461 ////////////////////////////// Evaluation of the measurement vector /////////////////////////////////////
465 rk=cluster(0); phik=cluster(1); zk=cluster(2);
468 Double_t CC=(*newTrack).GetC();
469 Double_t Zv=(*newTrack).GetZv();
470 Double_t Dv=(*newTrack).GetDv();
471 // cout<<" Dv e Zv = "<<Dv<<" "<<Zv<<"\n";
473 Double_t tgl= (zk-Zv)*Cy/TMath::ASin(Cy*rk);
476 // cout<<m(0)<<" "<<m(1)<<" "<<m(2)<<" "<<m(3)<<"\n";
477 ///////////////////////////////////// Evaluation of the error matrix V ///////////////////////////////
480 V(0,1)=0.; V(1,0)=0.;
481 Int_t Layer=newTrack->GetLayer();
484 V(1,3)=sigma[1]/rk; V(3,1)=V(1,3);
485 Double_t sigmaDv=newTrack->GetsigmaDv();
486 V(2,2)=sigmaDv*sigmaDv + newTrack->Getd2(Layer-1);
487 V(2,3)=newTrack->Getdtgl(Layer-1); V(3,2)=V(2,3);
488 Double_t sigmaZv=newTrack->GetsigmaZv();
489 V(3,3)=(sigma[1]+sigmaZv*sigmaZv)/(rk*rk) + newTrack->Gettgl2(Layer-1);
490 ///////////////////////////////////////////////////////////////////////////////////////////
492 //cout<<" d2 tgl2 dtgl = "<<newTrack->Getd2(Layer-1)<<" "<<newTrack->Gettgl2(Layer-1)<<" "<<newTrack->Getdtgl(Layer-1)<<"\n";
494 // V.Print(); getchar();
496 TMatrix C=newTrack->GetCMatrix();
497 TMatrix tmp(H,TMatrix::kMult,C);
498 TMatrix R(tmp,TMatrix::kMult,Ht); R+=V;
501 TMatrix K(C,TMatrix::kMult,Ht); K*=R;
502 TVector x=newTrack->GetVector();
505 x*=-1; x*=K; x+=savex;
507 C.Mult(K,tmp); C-=saveC; C*=-1;
508 newTrack->GetVector()=x;
509 newTrack->GetCMatrix()=C;
510 TVector res= newTrack->GetVector();
511 //cout<<" res = "<<res(0)<<" "<<res(1)<<" "<<res(2)<<" "<<res(3)<<" "<<res(4)<<"\n";
512 res*=H; res-=m; res*=-1.;
513 TMatrix Cn=newTrack->GetCMatrix();
514 TMatrix tmpn(H,TMatrix::kMult,Cn);
515 TMatrix Rn(tmpn,TMatrix::kMult,Ht); Rn-=V; Rn*=-1.;
518 TVector r=res; res*=Rn;
519 Double_t chi2= r*res;
521 newTrack->SetChi2(newTrack->GetChi2()+chi2);