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 **************************************************************************/
18 #include <Riostream.h>
21 #include "AliTRDgeometry.h"
22 #include "AliTRDcluster.h"
23 #include "AliTRDtrack.h"
24 #include "AliTRDclusterCorrection.h"
26 ClassImp(AliTRDtracklet)
30 AliTRDtracklet::AliTRDtracklet():fY(0),fX(0),fAlpha(0),fSigma2(0),fP0(0),fP1(0),fNFound(0),fNCross(0),fPlane(0),fExpectedSigma2(0),fChi2(0){
33 //_____________________________________________________________________________
35 AliTRDtrack::AliTRDtrack(const AliTRDcluster *c, UInt_t index,
36 const Double_t xx[5], const Double_t cc[15],
37 Double_t xref, Double_t alpha) : AliKalmanTrack() {
38 //-----------------------------------------------------------------
39 // This is the main track constructor.
40 //-----------------------------------------------------------------
45 if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi();
46 if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi();
50 fY=xx[0]; fZ=xx[1]; fE=xx[2]; fT=xx[3]; fC=xx[4];
55 fCzy=cc[1]; fCzz=cc[2];
56 fCey=cc[3]; fCez=cc[4]; fCee=cc[5];
57 fCty=cc[6]; fCtz=cc[7]; fCte=cc[8]; fCtt=cc[9];
58 fCcy=cc[10]; fCcz=cc[11]; fCce=cc[12]; fCct=cc[13]; fCcc=cc[14];
61 SetNumberOfClusters(1);
64 for (Int_t i=0;i<kNPlane;i++){
79 Double_t q = TMath::Abs(c->GetQ());
80 Double_t s = fX*fC - fE, t=fT;
81 if(s*s < 1) q *= TMath::Sqrt((1-s*s)/(1+t*t));
85 // initialisation [SR, GSI 18.02.2003] (i startd for 1)
86 for(UInt_t i=1; i<kMAX_CLUSTERS_PER_TRACK; i++) {
89 fIndexBackup[i] = 0; //bacup indexes MI
94 //_____________________________________________________________________________
95 AliTRDtrack::AliTRDtrack(const AliTRDtrack& t) : AliKalmanTrack(t) {
100 SetLabel(t.GetLabel());
101 fSeedLab=t.GetSeedLabel();
103 SetChi2(t.GetChi2());
105 for (Int_t i=0;i<kNPlane;i++){
106 fdEdxPlane[i] = t.fdEdxPlane[i];
107 fTimBinPlane[i] = t.fTimBinPlane[i];
112 fNRotate = t.fNRotate;
113 fStopped = t.fStopped;
115 fNExpected = t.fNExpected;
116 fNExpectedLast = t.fNExpectedLast;
119 fChi2Last = t.fChi2Last;
125 fY=t.fY; fZ=t.fZ; fE=t.fE; fT=t.fT; fC=t.fC;
128 fCzy=t.fCzy; fCzz=t.fCzz;
129 fCey=t.fCey; fCez=t.fCez; fCee=t.fCee;
130 fCty=t.fCty; fCtz=t.fCtz; fCte=t.fCte; fCtt=t.fCtt;
131 fCcy=t.fCcy; fCcz=t.fCcz; fCce=t.fCce; fCct=t.fCct; fCcc=t.fCcc;
133 Int_t n=t.GetNumberOfClusters();
134 SetNumberOfClusters(n);
135 for (Int_t i=0; i<n; i++) {
136 fIndex[i]=t.fIndex[i];
137 fIndexBackup[i]=t.fIndex[i]; // MI - backup indexes
141 // initialisation (i starts from n) [SR, GSI, 18.02.2003]
142 for(UInt_t i=n; i<kMAX_CLUSTERS_PER_TRACK; i++) {
145 fIndexBackup[i] = 0; //MI backup indexes
149 //_____________________________________________________________________________
150 AliTRDtrack::AliTRDtrack(const AliKalmanTrack& t, Double_t alpha)
153 // Constructor from AliTPCtrack or AliITStrack .
156 SetLabel(t.GetLabel());
158 SetMass(t.GetMass());
159 SetNumberOfClusters(0);
161 fdEdx=t.GetPIDsignal();
162 for (Int_t i=0;i<kNPlane;i++){
164 fTimBinPlane[i] = -1;
180 if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi();
181 else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi();
183 Double_t x, p[5]; t.GetExternalParameters(x,p);
189 fT=p[3]; x=GetLocalConvConst();
193 //Conversion of the covariance matrix
194 Double_t c[15]; t.GetExternalCovariance(c);
196 c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x;
198 Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5];
199 Double_t c32=fX*c[13] - c[8];
200 Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12];
203 fCzy=c[1 ]; fCzz=c[2 ];
204 fCey=c20; fCez=c21; fCee=c22;
205 fCty=c[6 ]; fCtz=c[7 ]; fCte=c32; fCtt=c[9 ];
206 fCcy=c[10]; fCcz=c[11]; fCce=c42; fCct=c[13]; fCcc=c[14];
208 // Initialization [SR, GSI, 18.02.2003]
209 for(UInt_t i=0; i<kMAX_CLUSTERS_PER_TRACK; i++) {
212 fIndexBackup[i] = 0; // MI backup indexes
216 //_____________________________________________________________________________
217 AliTRDtrack::AliTRDtrack(const AliESDtrack& t)
220 // Constructor from AliESDtrack
223 SetLabel(t.GetLabel());
225 SetMass(t.GetMass());
226 SetNumberOfClusters(t.GetTRDclusters(fIndex));
227 Int_t ncl = t.GetTRDclusters(fIndexBackup);
228 for (UInt_t i=ncl;i<kMAX_CLUSTERS_PER_TRACK;i++) {
230 fIndex[i] = 0; //MI store indexes
232 fdEdx=t.GetTRDsignal();
233 for (Int_t i=0;i<kNPlane;i++){
234 fdEdxPlane[i] = t.GetTRDsignals(i);
235 fTimBinPlane[i] = t.GetTRDTimBin(i);
250 fAlpha = t.GetAlpha();
251 if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi();
252 else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi();
254 Double_t x, p[5]; t.GetExternalParameters(x,p);
255 //Conversion of the covariance matrix
256 Double_t c[15]; t.GetExternalCovariance(c);
257 if (t.GetStatus()&AliESDtrack::kTRDbackup){
258 t.GetTRDExternalParameters(x,fAlpha,p,c);
259 if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi();
260 else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi();
266 fZ=p[1]; SaveLocalConvConst();
267 fT=p[3]; x=GetLocalConvConst();
272 c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x;
274 Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5];
275 Double_t c32=fX*c[13] - c[8];
276 Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12];
279 fCzy=c[1 ]; fCzz=c[2 ];
280 fCey=c20; fCez=c21; fCee=c22;
281 fCty=c[6 ]; fCtz=c[7 ]; fCte=c32; fCtt=c[9 ];
282 fCcy=c[10]; fCcz=c[11]; fCce=c42; fCct=c[13]; fCcc=c[14];
284 // Initialization [SR, GSI, 18.02.2003]
285 for(UInt_t i=0; i<kMAX_CLUSTERS_PER_TRACK; i++) {
287 // fIndex[i] = 0; //MI store indexes
290 if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return;
292 Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times);
293 SetIntegratedLength(t.GetIntegratedLength());
297 AliTRDtrack::~AliTRDtrack()
302 if (fBackupTrack) delete fBackupTrack;
308 Float_t AliTRDtrack::StatusForTOF()
311 if (GetNumberOfClusters()<20) return 0; //
312 if (fN>110&&fChi2/(Float_t(fN))<3) return 3; //gold
313 if (fNLast>30&&fChi2Last/(Float_t(fNLast))<3) return 3; //gold
314 if (fNLast>20&&fChi2Last/(Float_t(fNLast))<2) return 3; //gold
315 if (fNLast/(fNExpectedLast+3.)>0.8 && fChi2Last/Float_t(fNLast)<5&&fNLast>20) return 2; //silber
316 if (fNLast>5 &&((fNLast+1.)/(fNExpectedLast+1.))>0.8&&fChi2Last/(fNLast-5.)<6) return 1;
323 //____________________________________________________________________________
324 void AliTRDtrack::GetExternalParameters(Double_t& xr, Double_t x[5]) const {
326 // This function returns external TRD track representation
336 //_____________________________________________________________________________
337 void AliTRDtrack::GetExternalCovariance(Double_t cc[15]) const {
339 // This function returns external representation of the covriance matrix.
341 Double_t a=GetLocalConvConst();
343 Double_t c22=fX*fX*fCcc-2*fX*fCce+fCee;
344 Double_t c32=fX*fCct-fCte;
345 Double_t c20=fX*fCcy-fCey, c21=fX*fCcz-fCez, c42=fX*fCcc-fCce;
348 cc[1 ]=fCzy; cc[2 ]=fCzz;
349 cc[3 ]=c20; cc[4 ]=c21; cc[5 ]=c22;
350 cc[6 ]=fCty; cc[7 ]=fCtz; cc[8 ]=c32; cc[9 ]=fCtt;
351 cc[10]=fCcy*a; cc[11]=fCcz*a; cc[12]=c42*a; cc[13]=fCct*a; cc[14]=fCcc*a*a;
356 //_____________________________________________________________________________
357 void AliTRDtrack::GetCovariance(Double_t cc[15]) const {
360 cc[1]=fCzy; cc[2]=fCzz;
361 cc[3]=fCey; cc[4]=fCez; cc[5]=fCee;
362 cc[6]=fCcy; cc[7]=fCcz; cc[8]=fCce; cc[9]=fCcc;
363 cc[10]=fCty; cc[11]=fCtz; cc[12]=fCte; cc[13]=fCct; cc[14]=fCtt;
367 //_____________________________________________________________________________
368 Int_t AliTRDtrack::Compare(const TObject *o) const {
370 // Compares tracks according to their Y2 or curvature
372 AliTRDtrack *t=(AliTRDtrack*)o;
373 // Double_t co=t->GetSigmaY2();
374 // Double_t c =GetSigmaY2();
376 Double_t co=TMath::Abs(t->GetC());
377 Double_t c =TMath::Abs(GetC());
380 else if (c<co) return -1;
384 //_____________________________________________________________________________
385 void AliTRDtrack::CookdEdx(Double_t low, Double_t up) {
386 //-----------------------------------------------------------------
387 // Calculates dE/dX within the "low" and "up" cuts.
388 //-----------------------------------------------------------------
391 //Int_t nc=GetNumberOfClusters();
398 Float_t sorted[kMAX_CLUSTERS_PER_TRACK];
399 for (i=0; i < nc; i++) {
407 for (i=0; i<nc-1; i++) {
408 if (sorted[i]<=sorted[i+1]) continue;
409 Float_t tmp=sorted[i];
410 sorted[i]=sorted[i+1]; sorted[i+1]=tmp;
415 Int_t nl=Int_t(low*nc), nu=Int_t(up*nc);
417 //for (i=nl; i<=nu; i++) dedx += sorted[i];
419 for (i=0; i<nc; i++) dedx += sorted[i]; // ADDED by PS
420 if((nu-nl)) dedx /= (nu-nl); // ADDED by PS
426 //_____________________________________________________________________________
427 Int_t AliTRDtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho)
429 // Propagates a track of particle with mass=pm to a reference plane
430 // defined by x=xk through media of density=rho and radiationLength=x0
432 if (xk == fX) return 1;
434 if (TMath::Abs(fC*xk - fE) >= 0.90000) {
435 // Int_t n=GetNumberOfClusters();
436 //if (n>4) cerr << n << " AliTRDtrack: Propagation failed, \tPt = "
437 // << GetPt() << "\t" << GetLabel() << "\t" << GetMass() << endl;
440 Double_t lcc=GetLocalConvConst();
442 // track Length measurement [SR, GSI, 17.02.2003]
443 Double_t oldX = fX, oldY = fY, oldZ = fZ;
445 Double_t x1=fX, x2=x1+(xk-x1), dx=x2-x1, y1=fY, z1=fZ;
446 Double_t c1=fC*x1 - fE;
447 if((c1*c1) > 1) return 0;
448 Double_t r1=sqrt(1.- c1*c1);
449 Double_t c2=fC*x2 - fE;
450 if((c2*c2) > 1) return 0;
451 Double_t r2=sqrt(1.- c2*c2);
453 fY += dx*(c1+c2)/(r1+r2);
454 fZ += dx*(c1+c2)/(c1*r2 + c2*r1)*fT;
457 Double_t rr=r1+r2, cc=c1+c2, xx=x1+x2;
458 Double_t f02=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr);
459 Double_t f04= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr);
460 Double_t cr=c1*r2+c2*r1;
461 Double_t f12=-dx*fT*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr);
462 Double_t f13= dx*cc/cr;
463 Double_t f14=dx*fT*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr);
466 Double_t b00=f02*fCey + f04*fCcy, b01=f12*fCey + f14*fCcy + f13*fCty;
467 Double_t b10=f02*fCez + f04*fCcz, b11=f12*fCez + f14*fCcz + f13*fCtz;
468 Double_t b20=f02*fCee + f04*fCce, b21=f12*fCee + f14*fCce + f13*fCte;
469 Double_t b30=f02*fCte + f04*fCct, b31=f12*fCte + f14*fCct + f13*fCtt;
470 Double_t b40=f02*fCce + f04*fCcc, b41=f12*fCce + f14*fCcc + f13*fCct;
473 Double_t a00=f02*b20+f04*b40,a01=f02*b21+f04*b41,a11=f12*b21+f14*b41+f13*b31;
475 //F*C*Ft = C + (a + b + bt)
477 fCzy += a01 + b01 + b10;
488 //Change of the magnetic field *************
489 SaveLocalConvConst();
491 fC*=lcc/GetLocalConvConst();
494 //Multiple scattering ******************
495 Double_t d=sqrt((x1-fX)*(x1-fX)+(y1-fY)*(y1-fY)+(z1-fZ)*(z1-fZ));
496 Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt());
497 Double_t beta2=p2/(p2 + GetMass()*GetMass());
498 Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho;
500 Double_t ey=fC*fX - fE, ez=fT;
501 Double_t xz=fC*ez, zz1=ez*ez+1, xy=fE+ey;
503 fCee += (2*ey*ez*ez*fE+1-ey*ey+ez*ez+fE*fE*ez*ez)*theta2;
504 fCte += ez*zz1*xy*theta2;
505 fCtt += zz1*zz1*theta2;
506 fCce += xz*ez*xy*theta2;
507 fCct += xz*zz1*theta2;
508 fCcc += xz*xz*theta2;
510 Double_t dc22 = (1-ey*ey+xz*xz*fX*fX)*theta2;
511 Double_t dc32 = (xz*fX*zz1)*theta2;
512 Double_t dc33 = (zz1*zz1)*theta2;
513 Double_t dc42 = (xz*fX*xz)*theta2;
514 Double_t dc43 = (zz1*xz)*theta2;
515 Double_t dc44 = (xz*xz)*theta2;
523 //Energy losses************************
524 if((5940*beta2/(1-beta2+1e-10) - beta2) < 0) return 0;
526 Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2+1e-10)) - beta2)*d*rho;
529 fC*=(1.- sqrt(p2+GetMass()*GetMass())/p2*dE);
532 // track time measurement [SR, GSI 17.02.2002]
534 if (IsStartedTimeIntegral()) {
535 Double_t l2 = (fX-oldX)*(fX-oldX) + (fY-oldY)*(fY-oldY) + (fZ-oldZ)*(fZ-oldZ);
536 AddTimeStep(TMath::Sqrt(l2));
543 //_____________________________________________________________________________
544 Int_t AliTRDtrack::Update(const AliTRDcluster *c, Double_t chisq, UInt_t index, Double_t h01)
546 // Assignes found cluster to the track and updates track information
548 Bool_t fNoTilt = kTRUE;
549 if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE;
550 // add angular effect to the error contribution - MI
551 Float_t tangent2 = (fC*fX-fE)*(fC*fX-fE);
552 if (tangent2 < 0.90000){
553 tangent2 = tangent2/(1.-tangent2);
555 Float_t errang = tangent2*0.04; //
556 Float_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12.);
558 Double_t r00=c->GetSigmaY2() +errang, r01=0., r11=c->GetSigmaZ2()*100.;
559 r00+=fCyy; r01+=fCzy; r11+=fCzz;
560 Double_t det=r00*r11 - r01*r01;
561 Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
563 Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11;
564 Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11;
565 Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11;
566 Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11;
567 Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11;
569 Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ;
570 Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz;
574 if (TMath::Abs(cur*fX-eta) >= 0.90000) {
575 // Int_t n=GetNumberOfClusters();
576 //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n";
579 fY += k00*dy + k01*dz;
580 fZ += k10*dy + k11*dz;
582 //fT += k30*dy + k31*dz;
586 Double_t xu_factor = 100.; // empirical factor set by C.Xu
587 // in the first tilt version
588 dy=c->GetY() - fY; dz=c->GetZ() - fZ;
591 if (TMath::Abs(dz)>padlength/2.){
592 Float_t dy2 = c->GetY() - fY;
593 Float_t sign = (dz>0) ? -1.: 1.;
594 dy2+=h01*sign*padlength/2.;
601 r00=c->GetSigmaY2()+errang+add, r01=0., r11=c->GetSigmaZ2()*xu_factor;
602 r00+=(fCyy+2.0*h01*fCzy+h01*h01*fCzz);
604 r01+=(fCzy+h01*fCzz);
605 det=r00*r11 - r01*r01;
606 tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
608 k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01);
609 k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01);
610 k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01);
611 k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01);
612 k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01);
615 cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz;
616 if (TMath::Abs(cur*fX-eta) >= 0.90000) {
617 // Int_t n=GetNumberOfClusters();
618 //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n";
621 fY += k00*dy + k01*dz;
622 fZ += k10*dy + k11*dz;
624 fT += k30*dy + k31*dz;
634 Double_t c01=fCzy, c02=fCey, c03=fCty, c04=fCcy;
635 Double_t c12=fCez, c13=fCtz, c14=fCcz;
638 fCyy-=k00*fCyy+k01*fCzy; fCzy-=k00*c01+k01*fCzz;
639 fCey-=k00*c02+k01*c12; fCty-=k00*c03+k01*c13;
640 fCcy-=k00*c04+k01*c14;
642 fCzz-=k10*c01+k11*fCzz;
643 fCez-=k10*c02+k11*c12; fCtz-=k10*c03+k11*c13;
644 fCcz-=k10*c04+k11*c14;
646 fCee-=k20*c02+k21*c12; fCte-=k20*c03+k21*c13;
647 fCce-=k20*c04+k21*c14;
649 fCtt-=k30*c03+k31*c13;
650 fCct-=k40*c03+k41*c13;
651 //fCct-=k30*c04+k31*c14; // symmetric formula MI
653 fCcc-=k40*c04+k41*c14;
655 Int_t n=GetNumberOfClusters();
657 SetNumberOfClusters(n+1);
659 SetChi2(GetChi2()+chisq);
660 // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl;
664 //_____________________________________________________________________________
665 Int_t AliTRDtrack::UpdateMI(const AliTRDcluster *c, Double_t chisq, UInt_t index, Double_t h01,
668 // Assignes found cluster to the track and updates track information
670 Bool_t fNoTilt = kTRUE;
671 if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE;
672 // add angular effect to the error contribution and make correction - MI
673 //AliTRDclusterCorrection *corrector = AliTRDclusterCorrection::GetCorrection();
675 Double_t tangent2 = (fC*fX-fE)*(fC*fX-fE);
676 if (tangent2 < 0.90000){
677 tangent2 = tangent2/(1.-tangent2);
679 Double_t tangent = TMath::Sqrt(tangent2);
680 if ((fC*fX-fE)<0) tangent*=-1;
681 // Double_t correction = 0*plane;
682 Double_t errang = tangent2*0.04; //
683 Double_t errsys =0.025*0.025*20; //systematic error part
685 if (c->GetNPads()==4) extend=2;
686 //if (c->GetNPads()==5) extend=3;
687 //if (c->GetNPads()==6) extend=3;
688 //if (c->GetQ()<15) return 1;
693 correction = corrector->GetCorrection(plane,c->GetLocalTimeBin(),tangent);
694 if (TMath::Abs(correction)>0){
696 errang = corrector->GetSigma(plane,c->GetLocalTimeBin(),tangent);
698 errang += tangent2*0.04;
703 // Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12.);
705 Double_t r00=(c->GetSigmaY2() +errang+errsys)*extend, r01=0., r11=c->GetSigmaZ2()*10000.;
706 r00+=fCyy; r01+=fCzy; r11+=fCzz;
707 Double_t det=r00*r11 - r01*r01;
708 Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
710 Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11;
711 Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11;
712 Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11;
713 Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11;
714 Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11;
716 Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ;
717 Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz;
721 if (TMath::Abs(cur*fX-eta) >= 0.90000) {
722 // Int_t n=GetNumberOfClusters();
723 //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n";
726 fY += k00*dy + k01*dz;
727 fZ += k10*dy + k11*dz;
729 //fT += k30*dy + k31*dz;
733 Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12);
735 Double_t xu_factor = 1000.; // empirical factor set by C.Xu
736 // in the first tilt version
737 dy=c->GetY() - fY; dz=c->GetZ() - fZ;
738 //dy=dy+h01*dz+correction;
740 Double_t tiltdz = dz;
741 if (TMath::Abs(tiltdz)>padlength/2.) {
742 tiltdz = TMath::Sign(padlength/2,dz);
748 if (TMath::Abs(dz)>padlength/2.){
749 //Double_t dy2 = c->GetY() - fY;
750 //Double_t sign = (dz>0) ? -1.: 1.;
751 //dy2-=h01*sign*padlength/2.;
755 Double_t s00 = (c->GetSigmaY2()+errang)*extend+errsys+add; // error pad
756 Double_t s11 = c->GetSigmaZ2()*xu_factor; // error pad-row
758 r00 = fCyy + 2*fCzy*h01 + fCzz*h01*h01+s00;
759 r01 = fCzy + fCzz*h01;
761 det = r00*r11 - r01*r01;
763 tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
766 k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01);
767 k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01);
768 k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01);
769 k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01);
770 k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01);
773 cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz;
774 if (TMath::Abs(cur*fX-eta) >= 0.90000) {
775 //Int_t n=GetNumberOfClusters();
776 // if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n";
779 fY += k00*dy + k01*dz;
780 fZ += k10*dy + k11*dz;
782 fT += k30*dy + k31*dz;
795 Double_t oldyy = fCyy, oldzz = fCzz; //, oldee=fCee, oldcc =fCcc;
796 Double_t oldzy = fCzy, oldey = fCey, oldty=fCty, oldcy =fCcy;
797 Double_t oldez = fCez, oldtz = fCtz, oldcz=fCcz;
798 //Double_t oldte = fCte, oldce = fCce;
799 //Double_t oldct = fCct;
801 fCyy-=k00*oldyy+k01*oldzy;
802 fCzy-=k10*oldyy+k11*oldzy;
803 fCey-=k20*oldyy+k21*oldzy;
804 fCty-=k30*oldyy+k31*oldzy;
805 fCcy-=k40*oldyy+k41*oldzy;
807 fCzz-=k10*oldzy+k11*oldzz;
808 fCez-=k20*oldzy+k21*oldzz;
809 fCtz-=k30*oldzy+k31*oldzz;
810 fCcz-=k40*oldzy+k41*oldzz;
812 fCee-=k20*oldey+k21*oldez;
813 fCte-=k30*oldey+k31*oldez;
814 fCce-=k40*oldey+k41*oldez;
816 fCtt-=k30*oldty+k31*oldtz;
817 fCct-=k40*oldty+k41*oldtz;
819 fCcc-=k40*oldcy+k41*oldcz;
822 Int_t n=GetNumberOfClusters();
824 SetNumberOfClusters(n+1);
826 SetChi2(GetChi2()+chisq);
827 // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl;
834 //_____________________________________________________________________________
835 Int_t AliTRDtrack::UpdateMI(const AliTRDtracklet &tracklet)
838 // Assignes found tracklet to the track and updates track information
841 Double_t r00=(tracklet.GetTrackletSigma2()), r01=0., r11= 10000.;
842 r00+=fCyy; r01+=fCzy; r11+=fCzz;
844 Double_t det=r00*r11 - r01*r01;
845 Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
848 Double_t dy=tracklet.GetY() - fY, dz=tracklet.GetZ() - fZ;
851 Double_t s00 = tracklet.GetTrackletSigma2(); // error pad
852 Double_t s11 = 100000; // error pad-row
853 Float_t h01 = tracklet.GetTilt();
855 // r00 = fCyy + 2*fCzy*h01 + fCzz*h01*h01+s00;
856 r00 = fCyy + fCzz*h01*h01+s00;
857 // r01 = fCzy + fCzz*h01;
860 det = r00*r11 - r01*r01;
862 tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
864 Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11;
865 Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11;
866 Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11;
867 Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11;
868 Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11;
871 // k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01);
872 // k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01);
873 // k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01);
874 // k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01);
875 // k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01);
878 Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz;
879 // cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz;
880 if (TMath::Abs(cur*fX-eta) >= 0.90000) {
881 //Int_t n=GetNumberOfClusters();
882 // if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n";
892 fY += k00*dy + k01*dz;
893 fZ += k10*dy + k11*dz;
895 fT += k30*dy + k31*dz;
902 Double_t oldyy = fCyy, oldzz = fCzz; //, oldee=fCee, oldcc =fCcc;
903 Double_t oldzy = fCzy, oldey = fCey, oldty=fCty, oldcy =fCcy;
904 Double_t oldez = fCez, oldtz = fCtz, oldcz=fCcz;
905 //Double_t oldte = fCte, oldce = fCce;
906 //Double_t oldct = fCct;
908 fCyy-=k00*oldyy+k01*oldzy;
909 fCzy-=k10*oldyy+k11*oldzy;
910 fCey-=k20*oldyy+k21*oldzy;
911 fCty-=k30*oldyy+k31*oldzy;
912 fCcy-=k40*oldyy+k41*oldzy;
914 fCzz-=k10*oldzy+k11*oldzz;
915 fCez-=k20*oldzy+k21*oldzz;
916 fCtz-=k30*oldzy+k31*oldzz;
917 fCcz-=k40*oldzy+k41*oldzz;
919 fCee-=k20*oldey+k21*oldez;
920 fCte-=k30*oldey+k31*oldez;
921 fCce-=k40*oldey+k41*oldez;
923 fCtt-=k30*oldty+k31*oldtz;
924 fCct-=k40*oldty+k41*oldtz;
926 fCcc-=k40*oldcy+k41*oldcz;
929 Int_t n=GetNumberOfClusters();
931 SetNumberOfClusters(n+1);
933 SetChi2(GetChi2()+chisq);
934 // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl;
941 //_____________________________________________________________________________
942 Int_t AliTRDtrack::Rotate(Double_t alpha)
944 // Rotates track parameters in R*phi plane
949 if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi();
950 if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi();
952 Double_t x1=fX, y1=fY;
953 Double_t ca=cos(alpha), sa=sin(alpha);
954 Double_t r1=fC*fX - fE;
958 if((r1*r1) > 1) return 0;
959 fE=fE*ca + (fC*y1 + sqrt(1.- r1*r1))*sa;
961 Double_t r2=fC*fX - fE;
962 if (TMath::Abs(r2) >= 0.90000) {
963 Int_t n=GetNumberOfClusters();
964 if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !\n";
968 if((r2*r2) > 1) return 0;
969 Double_t y0=fY + sqrt(1.- r2*r2)/fC;
970 if ((fY-y0)*fC >= 0.) {
971 Int_t n=GetNumberOfClusters();
972 if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !!!\n";
977 Double_t f00=ca-1, f24=(y1 - r1*x1/sqrt(1.- r1*r1))*sa,
978 f20=fC*sa, f22=(ca + sa*r1/sqrt(1.- r1*r1))-1;
981 Double_t b00=fCyy*f00, b02=fCyy*f20+fCcy*f24+fCey*f22;
982 Double_t b10=fCzy*f00, b12=fCzy*f20+fCcz*f24+fCez*f22;
983 Double_t b20=fCey*f00, b22=fCey*f20+fCce*f24+fCee*f22;
984 Double_t b30=fCty*f00, b32=fCty*f20+fCct*f24+fCte*f22;
985 Double_t b40=fCcy*f00, b42=fCcy*f20+fCcc*f24+fCce*f22;
988 Double_t a00=f00*b00, a02=f00*b02, a22=f20*b02+f24*b42+f22*b22;
990 //F*C*Ft = C + (a + b + bt)
1005 //_____________________________________________________________________________
1006 Double_t AliTRDtrack::GetPredictedChi2(const AliTRDcluster *c, Double_t h01) const
1009 Bool_t fNoTilt = kTRUE;
1010 if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE;
1011 Double_t chi2, dy, r00, r01, r11;
1015 r00=c->GetSigmaY2();
1019 Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12);
1021 r00=c->GetSigmaY2(); r01=0.; r11=c->GetSigmaZ2();
1022 r00+=fCyy; r01+=fCzy; r11+=fCzz;
1024 Double_t det=r00*r11 - r01*r01;
1025 if (TMath::Abs(det) < 1.e-10) {
1026 Int_t n=GetNumberOfClusters();
1027 if (n>4) cerr<<n<<" AliTRDtrack warning: Singular matrix !\n";
1030 Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01;
1031 Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ;
1032 Double_t tiltdz = dz;
1033 if (TMath::Abs(tiltdz)>padlength/2.) {
1034 tiltdz = TMath::Sign(padlength/2,dz);
1039 chi2 = (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det;
1045 //_________________________________________________________________________
1046 void AliTRDtrack::GetPxPyPz(Double_t& px, Double_t& py, Double_t& pz) const
1048 // Returns reconstructed track momentum in the global system.
1050 Double_t pt=TMath::Abs(GetPt()); // GeV/c
1051 Double_t r=fC*fX-fE;
1054 if(r > 1) { py = pt; px = 0; }
1055 else if(r < -1) { py = -pt; px = 0; }
1057 y0=fY + sqrt(1.- r*r)/fC;
1058 px=-pt*(fY-y0)*fC; //cos(phi);
1059 py=-pt*(fE-fX*fC); //sin(phi);
1062 Double_t tmp=px*TMath::Cos(fAlpha) - py*TMath::Sin(fAlpha);
1063 py=px*TMath::Sin(fAlpha) + py*TMath::Cos(fAlpha);
1068 //_________________________________________________________________________
1069 void AliTRDtrack::GetGlobalXYZ(Double_t& x, Double_t& y, Double_t& z) const
1071 // Returns reconstructed track coordinates in the global system.
1073 x = fX; y = fY; z = fZ;
1074 Double_t tmp=x*TMath::Cos(fAlpha) - y*TMath::Sin(fAlpha);
1075 y=x*TMath::Sin(fAlpha) + y*TMath::Cos(fAlpha);
1080 //_________________________________________________________________________
1081 void AliTRDtrack::ResetCovariance() {
1083 // Resets covariance matrix
1088 fCey=0.; fCez=0.; fCee*=10.;
1089 fCty=0.; fCtz=0.; fCte=0.; fCtt*=10.;
1090 fCcy=0.; fCcz=0.; fCce=0.; fCct=0.; fCcc*=10.;
1093 void AliTRDtrack::ResetCovariance(Float_t mult) {
1095 // Resets covariance matrix
1100 fCey*=0.; fCez*=0.; fCee*=mult;
1101 fCty*=0.; fCtz*=0.; fCte*=0.; fCtt*=1.;
1102 fCcy*=0.; fCcz*=0.; fCce*=0.; fCct*=0.; fCcc*=mult;
1109 void AliTRDtrack::MakeBackupTrack()
1113 if (fBackupTrack) delete fBackupTrack;
1114 fBackupTrack = new AliTRDtrack(*this);
1118 Int_t AliTRDtrack::GetProlongation(Double_t xk, Double_t &y, Double_t &z){
1120 // Find prolongation at given x
1121 // return 0 if not exist
1123 Double_t c1=fC*fX - fE;
1124 if (TMath::Abs(c1)>1.) return 0;
1125 Double_t r1=TMath::Sqrt(1.- c1*c1);
1126 Double_t c2=fC*xk - fE;
1127 if (TMath::Abs(c2)>1.) return 0;
1128 Double_t r2=TMath::Sqrt(1.- c2*c2);
1129 y =fY + (xk-fX)*(c1+c2)/(r1+r2);
1130 z =fZ + (xk-fX)*(c1+c2)/(c1*r2 + c2*r1)*fT;