9 #include "AliITStrack.h"
10 #include "AliGenerator.h"
11 #include "AliITSRad.h"
16 AliITStrack::AliITStrack() {
17 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
18 // default constructor
21 fmCovariance = new TMatrix(5,5);
22 flistCluster = new TObjArray;
27 fErrorVertex.ResizeTo(3);
29 ClusterInTrack = new TMatrix(6,9);
31 for(i=0; i<6; i++) (*ClusterInTrack)(i,6)=(*ClusterInTrack)(i,7)=
32 (*ClusterInTrack)(i,8)=-1.;
41 AliITStrack::AliITStrack(const AliITStrack &cobj) {
42 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
45 fmCovariance = new TMatrix(5,5);
46 ClusterInTrack = new TMatrix(6,9);
48 for(i=0; i<6; i++) (*ClusterInTrack)(i,6)=(*ClusterInTrack)(i,7)=
49 (*ClusterInTrack)(i,8)=-1.;
50 flistCluster = new TObjArray;
52 fErrorVertex.ResizeTo(3);
53 fVertex = cobj.fVertex;
54 fErrorVertex = cobj.fErrorVertex;
57 fTPCtrack = cobj.fTPCtrack;
58 fNumClustInTrack = cobj.fNumClustInTrack;
60 fvTrack = cobj.fvTrack;
74 *fmCovariance = *cobj.fmCovariance;
76 *ClusterInTrack = *cobj.ClusterInTrack;
78 for(i=0; i<cobj.flistCluster->GetSize(); i++)
79 flistCluster->AddLast(cobj.flistCluster->At(i));
83 AliITStrack::AliITStrack(AliTPCtrack &obj)
85 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
90 fErrorVertex.ResizeTo(3);
95 AliGenerator *gener = gAlice->Generator();
97 gener->GetOrigin(Vxg,Vyg,Vzg);
100 fVertex(0)=(Double_t)Vxg;
101 fVertex(1)=(Double_t)Vyg;
102 fVertex(2)=(Double_t)Vzg;
105 fmCovariance = new TMatrix(5,5);
106 ClusterInTrack = new TMatrix(6,9);
109 for(i=0; i<6; i++) (*ClusterInTrack)(i,6)=(*ClusterInTrack)(i,7)=
110 (*ClusterInTrack)(i,8)=-1.;
111 flistCluster = new TObjArray;
112 fNumClustInTrack = 0;
117 AliITStrack::~AliITStrack() {
121 if(fmCovariance) delete fmCovariance;
122 if(flistCluster) delete flistCluster;
123 if(ClusterInTrack) delete ClusterInTrack;
129 void AliITStrack::LmTPC() {
131 // Transform the TPC state vector from TPC-local to master and build a new state vector ITS-type
132 // The covariance matrix is also modified accordingly
133 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
137 Double_t Alpha = fTPCtrack->GetAlpha();
139 //printf("LmTPC: Alpha %f\n",Alpha);
141 tpctrack(0) = fTPCtrack->GetY();
142 tpctrack(1) = fTPCtrack->GetZ();
143 tpctrack(2) = fTPCtrack->GetC();
144 tpctrack(3) = fTPCtrack->GetEta();
145 tpctrack(4) = fTPCtrack->GetTgl();
146 //cout<< " tpctracks = "<<tpctrack(0)<<" "<<tpctrack(1)<<" "<<tpctrack(2)<<" "<<tpctrack(3)<<" "<<tpctrack(4)<<
150 Double_t sina = TMath::Sin(Alpha);
151 Double_t cosa = TMath::Cos(Alpha);
152 Double_t xl= fTPCtrack->GetX();
153 xm = xl * cosa - tpctrack(0)*sina;
154 ym = xl * sina + tpctrack(0)*cosa;
156 //cout<<" xl e alpha = "<<xl<<" "<<Alpha<<"\n"; getchar();
160 ///////////////////////////////////// determine yo //////////////////////////////////////////////////
161 Double_t Vxl=fVertex(0)*cosa+fVertex(1)*sina;
162 Double_t Vyl= -fVertex(0)*sina+fVertex(1)*cosa;
163 Double_t Xo,Yo, signy;
164 Double_t R = 1./tpctrack(2);
165 Xo = tpctrack(3) / tpctrack(2);
167 Double_t Yo1, Yo2, diffsq1, diffsq2;
168 Yo1 = tpctrack(0) + TMath::Sqrt(R*R - (xl-Xo)*(xl-Xo));
169 Yo2 = tpctrack(0) - TMath::Sqrt(R*R - (xl-Xo)*(xl-Xo));
170 diffsq1=TMath::Abs((Yo1-Vyl)*(Yo1-Vyl)+(Xo-Vxl)*(Xo-Vxl)-R*R);
171 diffsq2=TMath::Abs((Yo2-Vyl)*(Yo2- Vyl)+(Xo-Vxl)*(Xo-Vxl)-R*R);
172 if(diffsq1<diffsq2) {Yo=Yo1; signy=1.;} else {Yo=Yo2; signy=-1.;};
173 ////////////////////////////////////////////////////////////////////////////////////////////////////
175 x0m = Xo * cosa - Yo * sina;
176 y0m = Xo * sina + Yo * cosa;
178 rtrack=TMath::Sqrt(xm*xm+ym*ym);
179 Double_t pigre=TMath::Pi();
181 if(ym == 0. || xm == 0.) {
182 if(ym == 0. && xm == 0.) {cout << " Error in AliITStrack::LmTPC x=0 and y=0 \n"; getchar();}
183 if(ym ==0. && xm>0.) phi=0.;
184 if(ym==0. && xm<0.) phi=pigre;
185 if(xm==0 && ym>0.) phi=pigre/2.;
186 if(xm==0 && ym<0.) phi=1.5*pigre;
189 if (xm>0. && ym>0.) phi=TMath::ATan(ym/xm);
190 if (xm<0. && ym>0.) phi=pigre+TMath::ATan(ym/xm);
191 if (xm<0. && ym<0.) phi=pigre+TMath::ATan(ym/xm);
192 if (xm>0. && ym<0.) phi=(2*pigre)+TMath::ATan(ym/xm);
194 if(phi<0. || phi>(2*pigre)) {cout<<"attention error on phi in AliITStrack:LmTPC \n"; getchar();}
198 fvTrack(3)=tpctrack(4);
199 fvTrack(4)=tpctrack(2);
202 Double_t dd=TMath::Sqrt((x0m-fVertex(0))*(x0m-fVertex(0))+(y0m-fVertex(1))*(y0m-fVertex(1)));
204 if (R>0) signdd=1.; else signdd=-1.;
205 fvTrack(2)=signdd*dd-R;
206 //cout<<" fvertex = "<<fVertex(0)<<" "<<fVertex(1)<<" "<<fVertex(2)<<"\n";
207 //cout<<" fvTrack(2) ="<<fvTrack(2)<<"\n"; getchar();
211 fTPCtrack->GetCovariance(cov);
218 localM(1,0)=localM(0,1)=cov[1];
219 localM(3,0)=localM(0,3)=cov[3];
220 localM(3,1)=localM(1,3)=cov[4];
221 localM(2,0)=localM(0,2)=cov[6];
222 localM(2,1)=localM(1,2)=cov[7];
223 localM(2,3)=localM(3,2)=cov[8];
224 localM(4,0)=localM(0,4)=cov[10];
225 localM(4,1)=localM(1,4)=cov[11];
226 localM(4,3)=localM(3,4)=cov[12];
227 localM(4,2)=localM(2,4)=cov[13];
231 Double_t dfidy, dDdy, dDdC, dDdeta;
233 dfidy=(xm*cosa+ym*sina)/(rtrack*rtrack);
234 dDdy=signdd*((y0m-fVertex(1))*cosa-(x0m-fVertex(0))*sina)/dd;
235 Double_t dyodr=signy*(R+(xl-Xo)*tpctrack(3))/TMath::Sqrt(R*R-(xl-Xo)*(xl-Xo));
236 Double_t dyomdr=sina*tpctrack(3)+cosa*dyodr;
237 Double_t dxomdr=cosa*tpctrack(3)-sina*dyodr;
238 Double_t ddddR=((x0m-fVertex(0))*dxomdr+(y0m-fVertex(1))*dyomdr)/dd;
239 dDdC=-R*R*(signdd*ddddR-1.);
240 Double_t dyoldxol=signy*(xl-Xo)/TMath::Sqrt(R*R-(xl-Xo)*(xl-Xo));
241 Double_t dxomdeta=R*(cosa-sina*dyoldxol);
242 Double_t dyomdeta=R*(sina+cosa*dyoldxol);
243 dDdeta=signdd*((x0m-fVertex(0))*dxomdeta+(y0m-fVertex(1))*dyomdeta)/dd;
245 F(0,1)=F(0,2)=F(0,3)=F(0,4)=0.;
247 F(1,0)=F(1,2)=F(1,3)=F(1,4)=0.;
252 F(3,0)=F(3,1)=F(3,2)=F(3,3)=0.;
254 F(4,0)=F(4,1)=F(4,3)=F(4,4)=0.;
256 // cout<<" Matrice F \n";
257 // F.Print(); getchar();
258 TMatrix Ft(TMatrix::kTransposed,F);
259 TMatrix temp(localM);
262 B*=temp; // B=F*localM*Ft
263 // cout<<" Matrice C\n";
264 // B.Print(); getchar();
269 AliITStrack &AliITStrack::operator=(AliITStrack obj) {
270 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
274 delete ClusterInTrack;
275 fmCovariance = new TMatrix(5,5);
276 ClusterInTrack = new TMatrix(6,9);
277 flistCluster = new TObjArray;
279 fTPCtrack = obj.fTPCtrack;
281 fNumClustInTrack = obj.fNumClustInTrack;
284 fErrorVertex=obj.fErrorVertex;
285 fvTrack = obj.fvTrack;
297 *fmCovariance = *obj.fmCovariance;
298 *ClusterInTrack = *obj.ClusterInTrack;
300 for(i=0; i<obj.flistCluster->GetSize(); i++) flistCluster->AddLast(obj.flistCluster->At(i));
306 void AliITStrack::PutCluster(Int_t layerc, TVector vecclust) {
307 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
309 (*ClusterInTrack)(layerc,0) = vecclust(0);
310 (*ClusterInTrack)(layerc,1) = vecclust(1);
311 (*ClusterInTrack)(layerc,2) = vecclust(2);
312 (*ClusterInTrack)(layerc,3) = vecclust(3);
313 (*ClusterInTrack)(layerc,4) = vecclust(4);
314 (*ClusterInTrack)(layerc,5) = vecclust(5);
315 (*ClusterInTrack)(layerc,6) = vecclust(6);
316 (*ClusterInTrack)(layerc,7) = vecclust(7);
317 (*ClusterInTrack)(layerc,8) = vecclust(8);
322 void AliITStrack::GetClusters() {
324 TMatrix A(*ClusterInTrack);
328 B(i,0)=A(i,6); B(i,1)=A(i,7); B(i,2)=A(i,8);
336 TVector AliITStrack::GetLabTrack(Int_t lay) {
338 VecLabel(0)=( (Float_t) (*ClusterInTrack)(lay,6) );
339 VecLabel(1)=( (Float_t) (*ClusterInTrack)(lay,7) );
340 VecLabel(2)=( (Float_t) (*ClusterInTrack)(lay,8) );
344 void AliITStrack::Search(TVector VecTotLabref, Long_t &labref, Int_t &freq){
345 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
351 for(i=0; i<18; i++) vecfreq[i]=0;
353 for(i=0; i<18; i++) {
354 for(j=0; j<18; j++) {
355 if(VecTotLabref(i) == 0.) VecTotLabref(i)=-3.;
356 if( (VecTotLabref(i)>=0.) && (VecTotLabref(i)==VecTotLabref(j)) ) vecfreq[i]++;
360 Long_t labdefault= (Long_t)1000000.;
362 for(i=0; i<18; i++) {
363 if(vecfreq[i]>freq) {freq=vecfreq[i]; imax=i;}
365 if(imax<0) labref=labdefault; else labref=(Long_t) VecTotLabref(imax);
369 void AliITStrack::Propagation(Double_t rk) {
370 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
371 //Propagation of track
372 Double_t duepi=2.*TMath::Pi();
373 Double_t rkm1=rtrack;
374 //cout<<" rk e rkm1 dentro Propagation "<<rk<<" "<<rkm1<<"\n";
377 Double_t Ak=argA(rk), Akm1=argA(rkm1);
378 Double_t ak=arga(rk), akm1=arga(rkm1);
379 fvTrack(0)+=TMath::ASin(Ak)-TMath::ASin(Akm1);
381 if(fvTrack(0)>duepi) fvTrack(0)-=duepi;
382 if(fvTrack(0)<0.) fvTrack(0)+=duepi;
384 Double_t tgl=fvTrack(3);
385 Double_t C=fvTrack(4);
386 Double_t D=fvTrack(2);
388 fvTrack(1)+=tgl/Cy*(TMath::ASin(ak)-TMath::ASin(akm1));
390 //cout<<"fvTrack(0) fvTrack(1) e rtrack dentro Propagation = "<<fvTrack(0)<<" "<<fvTrack(1)<<" "<<rtrack<<"\n";
393 Double_t Bk=argB(rk), Bkm1=argB(rkm1);
394 Double_t Ck=argC(rk), Ckm1=argC(rkm1);
396 F(0,2)=Ck/TMath::Sqrt(1.-Ak*Ak) - Ckm1/TMath::Sqrt(1.-Akm1*Akm1);
397 F(0,4)=Bk/TMath::Sqrt(1.-Ak*Ak) - Bkm1/TMath::Sqrt(1.-Akm1*Akm1);
398 F(1,2)=tgl*D*(1./rk - 1./rkm1);
400 F(0,0)=F(1,1)=F(2,2)=F(3,3)=F(4,4)=1.;
401 TMatrix Ft(TMatrix::kTransposed,F);
402 TMatrix temp(*fmCovariance);
403 //cout<<" C Matrix prima propagation =\n";
404 //temp.Print(); getchar();
408 //cout<<" C Matrix dopo propagation =\n"; // B=F*C*Ft
409 //B.Print(); getchar();
414 void AliITStrack::AddEL(Double_t signdE, Bool_t flagtot, Double_t mass) {
415 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
419 s(0)=0.0026+0.00283; s(1)=0.018; s(2)=0.0094; s(3)=0.0095; s(4)=0.0091; s(5)=0.0087;
420 //0.00277 is added in the first layer to take into account the energy loss in the beam pipe
422 Double_t cl=1.+fvTrack(3)*fvTrack(3); // cl=1/(cosl)**2 = 1 + (tgl)**2
423 Double_t sqcl=TMath::Sqrt(cl);
426 Double_t p2=pt*pt*cl;
427 Double_t E=TMath::Sqrt(p2+mass*mass);
428 Double_t beta2=p2/(p2+mass*mass);
432 Double_t stot=s(0)+s(1)+s(2)+s(3)+s(4)+s(5);
433 dE=0.153/beta2*(log(5940*beta2/(1-beta2)) - beta2)*stot*21.82*sqcl;
435 dE=0.153/beta2*(log(5940*beta2/(1-beta2)) - beta2)*s(fLayer-1)*21.82*sqcl;
440 Double_t p=TMath::Sqrt(E*E-mass*mass);
442 if((fvTrack)(4) < 0.) sign=-1.;
444 Double_t CC=(0.3*0.2)/(pt*100.);
449 void AliITStrack::AddEL(AliITSRad *rl, Double_t signdE, Bool_t flagtot, Double_t mass) {
450 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
454 //s(0)=0.0026+0.00283; s(1)=0.018; s(2)=0.0094; s(3)=0.0095; s(4)=0.0091; s(5)=0.0087;
455 //0.00277 is added in the first layer to take into account the energy loss in the beam pipe
457 //for(int k=0; k<6; k++) cout<<s(k)<<" "; cout<<"\n";
459 //Double_t Cold=fvTrack(4);
461 Double_t phi=fvTrack(0);
462 Double_t tgl=fvTrack(3);
463 Double_t theta=((TMath::Pi())/2.)-TMath::ATan(tgl);
464 //phi*=180./TMath::Pi();
465 //theta*=180./TMath::Pi();
466 //Double_t rad90=(TMath::Pi())/2.;
467 Double_t rad40=(TMath::Pi())*40./180.;
468 Double_t rad100=(TMath::Pi())*100/180;
469 Double_t rad360=(TMath::Pi())*2.;
470 Int_t imax=rl->Getimax();
471 Int_t jmax=rl->Getjmax();
472 Int_t i=(Int_t) ( (theta-rad40)/rad100*imax);
473 Int_t j=(Int_t) ( phi/rad360*jmax );
474 //Int_t i=(Int_t)( ((theta-((TMath::Pi())/4.))/((TMath::Pi())/2.))*imax );
475 //Int_t j=(Int_t)( (phi/((TMath::Pi())*2.))*jmax );
477 if(i>=imax) i=imax-1;
479 if(j>=jmax) j=jmax-1;
481 s(0) = 0.0028/TMath::Sin(theta)+( rl->GetRadMatrix1() )(i,j); // 0.0028 takes into account the beam pipe
482 s(1) = ( rl->GetRadMatrix2() )(i,j);
483 s(2) = ( rl->GetRadMatrix3() )(i,j);
484 s(3) = ( rl->GetRadMatrix4() )(i,j);
485 s(4) = ( rl->GetRadMatrix5() )(i,j);
486 s(5) = ( rl->GetRadMatrix6() )(i,j);
488 //for(int k=0; k<6; k++) cout<<s(k)<<" "; getchar();
490 //if(phi>60) {cout<<" phi = "<<phi<<"\n"; getchar();}
491 //if(theta<45 || theta>135) {cout<<" theta = "<<theta<<"\n"; getchar();}
492 //cout<<" dentro AddEl: phi, theta = "<<phi<<" "<<theta<<"\n"; getchar();
494 Double_t cl=1.+fvTrack(3)*fvTrack(3); // cl=1/(cosl)**2 = 1 + (tgl)**2
495 Double_t sqcl=TMath::Sqrt(cl);
498 Double_t p2=pt*pt*cl;
499 Double_t E=TMath::Sqrt(p2+mass*mass);
500 Double_t beta2=p2/(p2+mass*mass);
504 Double_t stot=s(0)+s(1)+s(2)+s(3)+s(4)+s(5);
505 dE=0.153/beta2*(log(5940*beta2/(1-beta2)) - beta2)*stot*21.82*sqcl;
507 dE=0.153/beta2*(log(5940*beta2/(1-beta2)) - beta2)*s(fLayer-1)*21.82*sqcl;
512 Double_t p=TMath::Sqrt(E*E-mass*mass);
514 if((fvTrack)(4) < 0.) sign=-1.;
516 Double_t CC=(0.3*0.2)/(pt*100.);
520 //Double_t DelCC=CC-Cold;
521 //cout<<" CC , DelCC, covCC = "<<CC<<" "<<DelCC<<" "<<(*fmCovariance)(4,4)<<"\n"; getchar();
522 //(*fmCovariance)(4,4)=(*fmCovariance)(4,4)+DelCC*DelCC;
525 void AliITStrack::Correct(Double_t rk) {
526 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
527 // correct track to take into account real geometry detector
529 Double_t duepi=2.*TMath::Pi();
530 Double_t rkm1=rtrack;
531 Double_t Ak=argA(rk), Akm1=argA(rkm1);
532 Double_t ak=arga(rk), akm1=arga(rkm1);
534 fvTrack(0)+=TMath::ASin(Ak)-TMath::ASin(Akm1);
535 if(fvTrack(0)>duepi) fvTrack(0)-=duepi;
536 if(fvTrack(0)<0.) fvTrack(0)+=duepi;
538 Double_t tgl=fvTrack(3);
539 Double_t C=fvTrack(4);
541 fvTrack(1)+=tgl/Cy*(TMath::ASin(ak)-TMath::ASin(akm1));
546 void AliITStrack::AddMS() {
548 ////////// Modification of the covariance matrix to take into account multiple scattering ///////////
549 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
553 s(0)=0.0026+0.00283; s(1)=0.018; s(2)=0.0094; s(3)=0.0095; s(4)=0.0091; s(5)=0.0087;
554 //0.00277 is added in the first layer to take into account the energy loss in the beam pipe
555 Double_t mass=0.1396;
556 Int_t layer=(Int_t)GetLayer();
558 Double_t tgl=fvTrack(3);
559 Double_t cosl=TMath::Cos(TMath::ATan(tgl));
560 Double_t D=fvTrack(2);
561 Double_t C=fvTrack(4);
563 Double_t Q20=1./(cosl*cosl);
566 Double_t Q40=Cy*(rtrack*rtrack-D*D)/(1.+ 2.*Cy*D);
567 Double_t dd=D+Cy*D*D-Cy*rtrack*rtrack;
568 Double_t Q41=-1./cosl*TMath::Sqrt(rtrack*rtrack - dd*dd)/(1.+ 2.*Cy*D);
572 J(0,0)=0.; J(0,1)=0.;
573 J(1,0)=0.; J(1,1)=0.;
576 J(3,0)=Q20; J(3,1)=0.;
577 J(4,0)=Q30; J(4,1)=0.;
579 Double_t p2=(GetPt()*GetPt())/(cosl*cosl);
580 Double_t beta2=p2/(p2+mass*mass);
581 Double_t theta2=14.1*14.1/(beta2*p2*1.e6)*(s(layer-1)/cosl);
583 TMatrix Jt(TMatrix::kTransposed,J);
584 TMatrix Q(J,TMatrix::kMult,Jt);
591 void AliITStrack::AddMS(AliITSRad *rl) {
593 ////////// Modification of the covariance matrix to take into account multiple scattering ///////////
594 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
598 //s(0)=0.0026+0.00283; s(1)=0.018; s(2)=0.0094; s(3)=0.0095; s(4)=0.0091; s(5)=0.0087;
599 //0.00277 is added in the first layer to take into account the energy loss in the beam pipe
602 Double_t phi=fvTrack(0);
603 Double_t tgl=fvTrack(3);
604 Double_t theta=((TMath::Pi())/2.)-TMath::ATan(tgl);
605 //phi*=180./TMath::Pi();
606 //theta*=180./TMath::Pi();
607 //Double_t rad90=(TMath::Pi())/2.;
608 Double_t rad40=(TMath::Pi())*40./180.;
609 Double_t rad100=(TMath::Pi())*100/180;
610 Double_t rad360=(TMath::Pi())*2.;
611 Int_t imax=rl->Getimax();
612 Int_t jmax=rl->Getjmax();
613 Int_t i=(Int_t) ( (theta-rad40)/rad100*imax);
614 Int_t j=(Int_t) ( phi/rad360*jmax);
615 //Int_t i=(Int_t)( ((theta-((TMath::Pi())/4.))/((TMath::Pi())/2.))*imax );
616 //Int_t j=(Int_t)( (phi/((TMath::Pi())*2.))*jmax );
619 if(i>=imax) i=imax-1;
621 if(j>=jmax) j=jmax-1;
623 s(0) = 0.0028/TMath::Sin(theta)+( rl->GetRadMatrix1() )(i,j); // 0.0028 takes into account the beam pipe
624 s(1) = ( rl->GetRadMatrix2() )(i,j);
625 s(2) = ( rl->GetRadMatrix3() )(i,j);
626 s(3) = ( rl->GetRadMatrix4() )(i,j);
627 s(4) = ( rl->GetRadMatrix5() )(i,j);
628 s(5) = ( rl->GetRadMatrix6() )(i,j);
630 Double_t mass=0.1396;
631 Int_t layer=(Int_t)GetLayer();
633 //Double_t tgl=fvTrack(3);
634 Double_t cosl=TMath::Cos(TMath::ATan(tgl));
635 Double_t D=fvTrack(2);
636 Double_t C=fvTrack(4);
638 Double_t Q20=1./(cosl*cosl);
641 Double_t Q40=Cy*(rtrack*rtrack-D*D)/(1.+ 2.*Cy*D);
642 Double_t dd=D+Cy*D*D-Cy*rtrack*rtrack;
643 Double_t Q41=-1./cosl*TMath::Sqrt(rtrack*rtrack - dd*dd)/(1.+ 2.*Cy*D);
646 Double_t xk=rtrack*TMath::Cos(fvTrack(0));
647 Double_t yk=rtrack*TMath::Sin(fvTrack(0));
648 Double_t rvertex=TMath::Sqrt((xk-fVertex(0))*(xk-fVertex(0)) + (yk-fVertex(1))*(yk-fVertex(1)));
649 Double_t Q40=Cy*(rvertex*rvertex-D*D)/(1.+ 2.*Cy*D);
650 Double_t dd=D+Cy*D*D-Cy*rvertex*rvertex;
651 Double_t Q41=-1./cosl*TMath::Sqrt(rvertex*rvertex - dd*dd)/(1.+ 2.*Cy*D);
655 J(0,0)=0.; J(0,1)=0.;
656 J(1,0)=0.; J(1,1)=0.;
659 J(3,0)=Q20; J(3,1)=0.;
660 J(4,0)=Q30; J(4,1)=0.;
662 Double_t p2=(GetPt()*GetPt())/(cosl*cosl);
663 Double_t beta2=p2/(p2+mass*mass);
664 Double_t theta2=14.1*14.1/(beta2*p2*1.e6)*(s(layer-1)/cosl);
666 TMatrix Jt(TMatrix::kTransposed,J);
667 TMatrix Q(J,TMatrix::kMult,Jt);
673 void AliITStrack::PrimaryTrack(AliITSRad *rl) {
674 //Origin A. Badala' and G.S. Pappalardo: e-mail Angela.Badala@ct.infn.it, Giuseppe.S.Pappalardo@ct.infn.it
675 // calculation of part of covariance matrix for vertex constraint
679 Rlayer[0]=4.; Rlayer[1]=7.; Rlayer[2]=14.9; Rlayer[3]=23.8;
680 Rlayer[4]=39.1; Rlayer[5]=43.6;
682 Double_t Cy=fvTrack(4)/2.;
683 Double_t tgl=(fvTrack(1)-Zv)*Cy/TMath::ASin(Cy*rtrack);
686 fvTrack(1)=rtrack*tgl;
691 newC(4,4)=(*fmCovariance)(4,4);
692 (*fmCovariance)=newC;
696 for (i=0; i<6; i++) {
697 Propagation(Rlayer[i]);
699 d2(i)=(*fmCovariance)(2,2);
700 tgl2(i)=(*fmCovariance)(3,3);
701 dtgl(i)=(*fmCovariance)(2,3);
708 Int_t AliITStrack::DoNotCross(Double_t rk) const{
709 Double_t C=fvTrack(4);
710 Double_t D=fvTrack(2);
712 return (TMath::Abs((Cy*rk+(1.+Cy*D)*D/rk)/(1.+2.*Cy*D))>=1.)?1:0;
716 Double_t AliITStrack::argA(Double_t rk) const {
717 Double_t C=fvTrack(4);
718 Double_t D=fvTrack(2);
720 Double_t arg=(Cy*rk + (1 + Cy*D)*D/rk)/(1.+ 2.*Cy*D);
721 if (TMath::Abs(arg) < 1.) return arg;
722 //cout<<"class AliITSTrack: argA out of range !\n";/* getchar();*/
723 return (arg>0) ? 0.99999999999 : -0.9999999999;
726 Double_t AliITStrack::arga(Double_t rk) const {
727 Double_t C=fvTrack(4);
728 Double_t D=fvTrack(2);
730 Double_t arg=(rk*rk - D*D)/(1.+ 2.*Cy*D);
731 if (arg<0.) {/*cout<<"class AliITSTrack: arga out of range !\n";*/ arg=0.;}
732 return Cy*TMath::Sqrt(arg);
735 Double_t AliITStrack::argB(Double_t rk) const {
736 Double_t C=fvTrack(4);
737 Double_t D=fvTrack(2);
739 return (rk*rk - D*D)/(rk*(1.+ 2.*Cy*D)*(1.+ 2.*Cy*D));
742 Double_t AliITStrack::argC(Double_t rk) const {
743 Double_t C=fvTrack(4);
744 Double_t D=fvTrack(2);
746 return (1./rk - 2.*Cy*argA(rk)/(1.+ 2.*Cy*D));
749 Double_t AliITStrack::PhiDef(Double_t x, Double_t y){
750 Double_t pigre= TMath::Pi();
752 if(y == 0. || x == 0.) {
753 if(y == 0. && x == 0.) {
754 cout << " Error in AliITStracking::PhiDef x=0 and y=0 \n"; getchar();
756 if(y==0. && x>0.) phi=0.;
757 if(y==0. && x<0.) phi=pigre;
758 if(x==0 && y>0.) phi=pigre/2.;
759 if(x==0 && y<0.) phi=1.5*pigre;
762 if (x>0. && y>0.) phi=TMath::ATan(y/x);
763 if (x<0. && y>0.) phi=pigre+TMath::ATan(y/x);
764 if (x<0. && y<0.) phi=pigre+TMath::ATan(y/x);
765 if (x>0. && y<0.) phi=(2.*pigre)+TMath::ATan(y/x);
767 if(phi<0. || phi>(2*pigre)) {
768 cout<<" Error on phi in AliITStracking::PhiDef \n"; getchar();