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"
25 #include "AliTrackReference.h"
27 ClassImp(AliTRDtracklet)
31 AliTRDtracklet::AliTRDtracklet():fY(0),fX(0),fAlpha(0),fSigma2(0),fP0(0),fP1(0),fNFound(0),fNCross(0),fPlane(0),fExpectedSigma2(0),fChi2(0){
34 //_____________________________________________________________________________
36 AliTRDtrack::AliTRDtrack(const AliTRDcluster *c, UInt_t index,
37 const Double_t xx[5], const Double_t cc[15],
38 Double_t xref, Double_t alpha) : AliKalmanTrack() {
39 //-----------------------------------------------------------------
40 // This is the main track constructor.
41 //-----------------------------------------------------------------
46 if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi();
47 if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi();
51 fY=xx[0]; fZ=xx[1]; fE=xx[2]; fT=xx[3]; fC=xx[4];
56 fCzy=cc[1]; fCzz=cc[2];
57 fCey=cc[3]; fCez=cc[4]; fCee=cc[5];
58 fCty=cc[6]; fCtz=cc[7]; fCte=cc[8]; fCtt=cc[9];
59 fCcy=cc[10]; fCcz=cc[11]; fCce=cc[12]; fCct=cc[13]; fCcc=cc[14];
62 SetNumberOfClusters(1);
66 for (Int_t i=0;i<kNPlane;i++){
81 Double_t q = TMath::Abs(c->GetQ());
82 Double_t s = fX*fC - fE, t=fT;
83 if(s*s < 1) q *= TMath::Sqrt((1-s*s)/(1+t*t));
87 // initialisation [SR, GSI 18.02.2003] (i startd for 1)
88 for(UInt_t i=1; i<kMAX_CLUSTERS_PER_TRACK; i++) {
91 fIndexBackup[i] = 0; //bacup indexes MI
96 //_____________________________________________________________________________
97 AliTRDtrack::AliTRDtrack(const AliTRDtrack& t) : AliKalmanTrack(t) {
102 SetLabel(t.GetLabel());
103 fSeedLab=t.GetSeedLabel();
105 SetChi2(t.GetChi2());
108 for (Int_t i=0;i<kNPlane;i++){
109 fdEdxPlane[i] = t.fdEdxPlane[i];
110 fTimBinPlane[i] = t.fTimBinPlane[i];
115 fNRotate = t.fNRotate;
116 fStopped = t.fStopped;
118 fNExpected = t.fNExpected;
119 fNExpectedLast = t.fNExpectedLast;
122 fChi2Last = t.fChi2Last;
128 fY=t.fY; fZ=t.fZ; fE=t.fE; fT=t.fT; fC=t.fC;
131 fCzy=t.fCzy; fCzz=t.fCzz;
132 fCey=t.fCey; fCez=t.fCez; fCee=t.fCee;
133 fCty=t.fCty; fCtz=t.fCtz; fCte=t.fCte; fCtt=t.fCtt;
134 fCcy=t.fCcy; fCcz=t.fCcz; fCce=t.fCce; fCct=t.fCct; fCcc=t.fCcc;
136 Int_t n=t.GetNumberOfClusters();
137 SetNumberOfClusters(n);
138 for (Int_t i=0; i<n; i++) {
139 fIndex[i]=t.fIndex[i];
140 fIndexBackup[i]=t.fIndex[i]; // MI - backup indexes
144 // initialisation (i starts from n) [SR, GSI, 18.02.2003]
145 for(UInt_t i=n; i<kMAX_CLUSTERS_PER_TRACK; i++) {
148 fIndexBackup[i] = 0; //MI backup indexes
152 //_____________________________________________________________________________
153 AliTRDtrack::AliTRDtrack(const AliKalmanTrack& t, Double_t alpha)
156 // Constructor from AliTPCtrack or AliITStrack .
159 SetLabel(t.GetLabel());
161 SetMass(t.GetMass());
162 SetNumberOfClusters(0);
164 fdEdx=t.GetPIDsignal();
165 for (Int_t i=0;i<kNPlane;i++){
167 fTimBinPlane[i] = -1;
183 if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi();
184 else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi();
186 Double_t x, p[5]; t.GetExternalParameters(x,p);
192 fT=p[3]; x=GetLocalConvConst();
196 //Conversion of the covariance matrix
197 Double_t c[15]; t.GetExternalCovariance(c);
199 c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x;
201 Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5];
202 Double_t c32=fX*c[13] - c[8];
203 Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12];
206 fCzy=c[1 ]; fCzz=c[2 ];
207 fCey=c20; fCez=c21; fCee=c22;
208 fCty=c[6 ]; fCtz=c[7 ]; fCte=c32; fCtt=c[9 ];
209 fCcy=c[10]; fCcz=c[11]; fCce=c42; fCct=c[13]; fCcc=c[14];
211 // Initialization [SR, GSI, 18.02.2003]
212 for(UInt_t i=0; i<kMAX_CLUSTERS_PER_TRACK; i++) {
215 fIndexBackup[i] = 0; // MI backup indexes
219 //_____________________________________________________________________________
220 AliTRDtrack::AliTRDtrack(const AliESDtrack& t)
223 // Constructor from AliESDtrack
226 SetLabel(t.GetLabel());
228 SetMass(t.GetMass());
229 SetNumberOfClusters(t.GetTRDclusters(fIndex));
230 Int_t ncl = t.GetTRDclusters(fIndexBackup);
231 for (UInt_t i=ncl;i<kMAX_CLUSTERS_PER_TRACK;i++) {
233 fIndex[i] = 0; //MI store indexes
235 fdEdx=t.GetTRDsignal();
236 for (Int_t i=0;i<kNPlane;i++){
237 fdEdxPlane[i] = t.GetTRDsignals(i);
238 fTimBinPlane[i] = t.GetTRDTimBin(i);
253 fAlpha = t.GetAlpha();
254 if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi();
255 else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi();
257 Double_t x, p[5]; t.GetExternalParameters(x,p);
258 //Conversion of the covariance matrix
259 Double_t c[15]; t.GetExternalCovariance(c);
260 if (t.GetStatus()&AliESDtrack::kTRDbackup){
261 t.GetTRDExternalParameters(x,fAlpha,p,c);
262 if (fAlpha < -TMath::Pi()) fAlpha += 2*TMath::Pi();
263 else if (fAlpha >= TMath::Pi()) fAlpha -= 2*TMath::Pi();
269 fZ=p[1]; SaveLocalConvConst();
270 fT=p[3]; x=GetLocalConvConst();
275 c[10]/=x; c[11]/=x; c[12]/=x; c[13]/=x; c[14]/=x*x;
277 Double_t c22=fX*fX*c[14] - 2*fX*c[12] + c[5];
278 Double_t c32=fX*c[13] - c[8];
279 Double_t c20=fX*c[10] - c[3], c21=fX*c[11] - c[4], c42=fX*c[14] - c[12];
282 fCzy=c[1 ]; fCzz=c[2 ];
283 fCey=c20; fCez=c21; fCee=c22;
284 fCty=c[6 ]; fCtz=c[7 ]; fCte=c32; fCtt=c[9 ];
285 fCcy=c[10]; fCcz=c[11]; fCce=c42; fCct=c[13]; fCcc=c[14];
287 // Initialization [SR, GSI, 18.02.2003]
288 for(UInt_t i=0; i<kMAX_CLUSTERS_PER_TRACK; i++) {
290 // fIndex[i] = 0; //MI store indexes
293 if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return;
295 Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times);
296 SetIntegratedLength(t.GetIntegratedLength());
301 AliTRDtrack * AliTRDtrack::MakeTrack(const AliTrackReference *ref, Double_t mass)
304 // Make dummy track from the track reference
305 // negative mass means opposite charge
309 for (Int_t i=0;i<15;i++) cc[i]=0;
310 Double_t x = ref->X(), y = ref->Y(), z = ref->Z();
311 Double_t alpha = TMath::ATan2(y,x);
312 Double_t xr = TMath::Sqrt(x*x+y*y);
315 xx[3] = ref->Pz()/ref->Pt();
317 Float_t xyz[3]={x,y,z};
318 Float_t convConst = 0;
319 (AliKalmanTrack::GetFieldMap())->Field(xyz,b);
320 convConst=1000/0.299792458/(1e-13 - b[2]);
321 xx[4] = 1./(convConst*ref->Pt());
322 if (mass<0) xx[4]*=-1.; // negative mass - negative direction
323 Double_t lcos = (x*ref->Px()+y*ref->Py())/(xr*ref->Pt());
324 Double_t lsin = TMath::Sin(TMath::ACos(lcos));
325 if (mass<0) lsin*=-1.;
326 xx[2] = xr*xx[4]-lsin;
328 AliTRDtrack * track = new AliTRDtrack(&cl,100,xx,cc,xr,alpha);
329 track->SetMass(TMath::Abs(mass));
330 track->StartTimeIntegral();
335 AliTRDtrack::~AliTRDtrack()
340 if (fBackupTrack) delete fBackupTrack;
346 Float_t AliTRDtrack::StatusForTOF()
349 if (GetNumberOfClusters()<20) return 0; //
350 if (fN>110&&fChi2/(Float_t(fN))<3) return 3; //gold
351 if (fNLast>30&&fChi2Last/(Float_t(fNLast))<3) return 3; //gold
352 if (fNLast>20&&fChi2Last/(Float_t(fNLast))<2) return 3; //gold
353 if (fNLast/(fNExpectedLast+3.)>0.8 && fChi2Last/Float_t(fNLast)<5&&fNLast>20) return 2; //silber
354 if (fNLast>5 &&((fNLast+1.)/(fNExpectedLast+1.))>0.8&&fChi2Last/(fNLast-5.)<6) return 1;
361 //____________________________________________________________________________
362 void AliTRDtrack::GetExternalParameters(Double_t& xr, Double_t x[5]) const {
364 // This function returns external TRD track representation
374 //_____________________________________________________________________________
375 void AliTRDtrack::GetExternalCovariance(Double_t cc[15]) const {
377 // This function returns external representation of the covriance matrix.
379 Double_t a=GetLocalConvConst();
381 Double_t c22=fX*fX*fCcc-2*fX*fCce+fCee;
382 Double_t c32=fX*fCct-fCte;
383 Double_t c20=fX*fCcy-fCey, c21=fX*fCcz-fCez, c42=fX*fCcc-fCce;
386 cc[1 ]=fCzy; cc[2 ]=fCzz;
387 cc[3 ]=c20; cc[4 ]=c21; cc[5 ]=c22;
388 cc[6 ]=fCty; cc[7 ]=fCtz; cc[8 ]=c32; cc[9 ]=fCtt;
389 cc[10]=fCcy*a; cc[11]=fCcz*a; cc[12]=c42*a; cc[13]=fCct*a; cc[14]=fCcc*a*a;
394 //_____________________________________________________________________________
395 void AliTRDtrack::GetCovariance(Double_t cc[15]) const {
398 cc[1]=fCzy; cc[2]=fCzz;
399 cc[3]=fCey; cc[4]=fCez; cc[5]=fCee;
400 cc[6]=fCcy; cc[7]=fCcz; cc[8]=fCce; cc[9]=fCcc;
401 cc[10]=fCty; cc[11]=fCtz; cc[12]=fCte; cc[13]=fCct; cc[14]=fCtt;
405 //_____________________________________________________________________________
406 Int_t AliTRDtrack::Compare(const TObject *o) const {
408 // Compares tracks according to their Y2 or curvature
410 AliTRDtrack *t=(AliTRDtrack*)o;
411 // Double_t co=t->GetSigmaY2();
412 // Double_t c =GetSigmaY2();
414 Double_t co=TMath::Abs(t->GetC());
415 Double_t c =TMath::Abs(GetC());
418 else if (c<co) return -1;
422 //_____________________________________________________________________________
423 void AliTRDtrack::CookdEdx(Double_t low, Double_t up) {
424 //-----------------------------------------------------------------
425 // Calculates dE/dX within the "low" and "up" cuts.
426 //-----------------------------------------------------------------
429 //Int_t nc=GetNumberOfClusters();
436 Float_t sorted[kMAX_CLUSTERS_PER_TRACK];
437 for (i=0; i < nc; i++) {
445 for (i=0; i<nc-1; i++) {
446 if (sorted[i]<=sorted[i+1]) continue;
447 Float_t tmp=sorted[i];
448 sorted[i]=sorted[i+1]; sorted[i+1]=tmp;
453 Int_t nl=Int_t(low*nc), nu=Int_t(up*nc);
455 //for (i=nl; i<=nu; i++) dedx += sorted[i];
457 for (i=0; i<nc; i++) dedx += sorted[i]; // ADDED by PS
458 if((nu-nl)) dedx /= (nu-nl); // ADDED by PS
464 //_____________________________________________________________________________
465 Int_t AliTRDtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho)
467 // Propagates a track of particle with mass=pm to a reference plane
468 // defined by x=xk through media of density=rho and radiationLength=x0
470 if (xk == fX) return 1;
472 if (TMath::Abs(fC*xk - fE) >= 0.90000) {
473 // Int_t n=GetNumberOfClusters();
474 //if (n>4) cerr << n << " AliTRDtrack: Propagation failed, \tPt = "
475 // << GetPt() << "\t" << GetLabel() << "\t" << GetMass() << endl;
478 Double_t lcc=GetLocalConvConst();
480 // track Length measurement [SR, GSI, 17.02.2003]
481 Double_t oldX = fX, oldY = fY, oldZ = fZ;
483 Double_t x1=fX, x2=x1+(xk-x1), dx=x2-x1, y1=fY, z1=fZ;
484 Double_t c1=fC*x1 - fE;
485 if((c1*c1) > 1) return 0;
486 Double_t r1=sqrt(1.- c1*c1);
487 Double_t c2=fC*x2 - fE;
488 if((c2*c2) > 1) return 0;
489 Double_t r2=sqrt(1.- c2*c2);
491 fY += dx*(c1+c2)/(r1+r2);
492 fZ += dx*(c1+c2)/(c1*r2 + c2*r1)*fT;
495 Double_t rr=r1+r2, cc=c1+c2, xx=x1+x2;
496 Double_t f02=-dx*(2*rr + cc*(c1/r1 + c2/r2))/(rr*rr);
497 Double_t f04= dx*(rr*xx + cc*(c1*x1/r1+c2*x2/r2))/(rr*rr);
498 Double_t cr=c1*r2+c2*r1;
499 Double_t f12=-dx*fT*(2*cr + cc*(c2*c1/r1-r1 + c1*c2/r2-r2))/(cr*cr);
500 Double_t f13= dx*cc/cr;
501 Double_t f14=dx*fT*(cr*xx-cc*(r1*x2-c2*c1*x1/r1+r2*x1-c1*c2*x2/r2))/(cr*cr);
504 Double_t b00=f02*fCey + f04*fCcy, b01=f12*fCey + f14*fCcy + f13*fCty;
505 Double_t b10=f02*fCez + f04*fCcz, b11=f12*fCez + f14*fCcz + f13*fCtz;
506 Double_t b20=f02*fCee + f04*fCce, b21=f12*fCee + f14*fCce + f13*fCte;
507 Double_t b30=f02*fCte + f04*fCct, b31=f12*fCte + f14*fCct + f13*fCtt;
508 Double_t b40=f02*fCce + f04*fCcc, b41=f12*fCce + f14*fCcc + f13*fCct;
511 Double_t a00=f02*b20+f04*b40,a01=f02*b21+f04*b41,a11=f12*b21+f14*b41+f13*b31;
513 //F*C*Ft = C + (a + b + bt)
515 fCzy += a01 + b01 + b10;
526 //Change of the magnetic field *************
527 SaveLocalConvConst();
529 fC*=lcc/GetLocalConvConst();
532 //Multiple scattering ******************
533 Double_t d=sqrt((x1-fX)*(x1-fX)+(y1-fY)*(y1-fY)+(z1-fZ)*(z1-fZ));
534 Double_t p2=(1.+ GetTgl()*GetTgl())/(Get1Pt()*Get1Pt());
535 Double_t beta2=p2/(p2 + GetMass()*GetMass());
536 Double_t theta2=14.1*14.1/(beta2*p2*1e6)*d/x0*rho;
538 Double_t ey=fC*fX - fE, ez=fT;
539 Double_t xz=fC*ez, zz1=ez*ez+1, xy=fE+ey;
541 fCee += (2*ey*ez*ez*fE+1-ey*ey+ez*ez+fE*fE*ez*ez)*theta2;
542 fCte += ez*zz1*xy*theta2;
543 fCtt += zz1*zz1*theta2;
544 fCce += xz*ez*xy*theta2;
545 fCct += xz*zz1*theta2;
546 fCcc += xz*xz*theta2;
548 Double_t dc22 = (1-ey*ey+xz*xz*fX*fX)*theta2;
549 Double_t dc32 = (xz*fX*zz1)*theta2;
550 Double_t dc33 = (zz1*zz1)*theta2;
551 Double_t dc42 = (xz*fX*xz)*theta2;
552 Double_t dc43 = (zz1*xz)*theta2;
553 Double_t dc44 = (xz*xz)*theta2;
561 //Energy losses************************
562 if((5940*beta2/(1-beta2+1e-10) - beta2) < 0) return 0;
564 Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2+1e-10)) - beta2)*d*rho;
568 fC*=(1.- sqrt(p2+GetMass()*GetMass())/p2*dE);
570 // Double_t sigmade = 0.1*dE*TMath::Sqrt(TMath::Sqrt(1+fT*fT)*90./(d+0.0001)); // 20 percent fluctuation - normalized to some length
571 Double_t sigmade = 0.02*TMath::Sqrt(TMath::Abs(dE)); // energy loss fluctuation
572 Double_t sigmac2 = sigmade*sigmade*fC*fC*(p2+GetMass()*GetMass())/(p2*p2);
574 fCee += fX*fX*sigmac2;
576 // track time measurement [SR, GSI 17.02.2002]
578 if (IsStartedTimeIntegral()) {
579 Double_t l2 = (fX-oldX)*(fX-oldX) + (fY-oldY)*(fY-oldY) + (fZ-oldZ)*(fZ-oldZ);
580 AddTimeStep(TMath::Sqrt(l2));
587 //_____________________________________________________________________________
588 Int_t AliTRDtrack::Update(const AliTRDcluster *c, Double_t chisq, UInt_t index, Double_t h01)
590 // Assignes found cluster to the track and updates track information
592 Bool_t fNoTilt = kTRUE;
593 if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE;
594 // add angular effect to the error contribution - MI
595 Float_t tangent2 = (fC*fX-fE)*(fC*fX-fE);
596 if (tangent2 < 0.90000){
597 tangent2 = tangent2/(1.-tangent2);
599 Float_t errang = tangent2*0.04; //
600 Float_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12.);
602 Double_t r00=c->GetSigmaY2() +errang, r01=0., r11=c->GetSigmaZ2()*100.;
603 r00+=fCyy; r01+=fCzy; r11+=fCzz;
604 Double_t det=r00*r11 - r01*r01;
605 Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
607 Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11;
608 Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11;
609 Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11;
610 Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11;
611 Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11;
613 Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ;
614 Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz;
618 if (TMath::Abs(cur*fX-eta) >= 0.90000) {
619 // Int_t n=GetNumberOfClusters();
620 //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n";
623 fY += k00*dy + k01*dz;
624 fZ += k10*dy + k11*dz;
626 //fT += k30*dy + k31*dz;
630 Double_t xu_factor = 100.; // empirical factor set by C.Xu
631 // in the first tilt version
632 dy=c->GetY() - fY; dz=c->GetZ() - fZ;
635 if (TMath::Abs(dz)>padlength/2.){
636 Float_t dy2 = c->GetY() - fY;
637 Float_t sign = (dz>0) ? -1.: 1.;
638 dy2+=h01*sign*padlength/2.;
645 r00=c->GetSigmaY2()+errang+add, r01=0., r11=c->GetSigmaZ2()*xu_factor;
646 r00+=(fCyy+2.0*h01*fCzy+h01*h01*fCzz);
648 r01+=(fCzy+h01*fCzz);
649 det=r00*r11 - r01*r01;
650 tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
652 k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01);
653 k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01);
654 k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01);
655 k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01);
656 k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01);
659 cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz;
660 if (TMath::Abs(cur*fX-eta) >= 0.90000) {
661 // Int_t n=GetNumberOfClusters();
662 //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n";
665 fY += k00*dy + k01*dz;
666 fZ += k10*dy + k11*dz;
668 fT += k30*dy + k31*dz;
678 Double_t c01=fCzy, c02=fCey, c03=fCty, c04=fCcy;
679 Double_t c12=fCez, c13=fCtz, c14=fCcz;
682 fCyy-=k00*fCyy+k01*fCzy; fCzy-=k00*c01+k01*fCzz;
683 fCey-=k00*c02+k01*c12; fCty-=k00*c03+k01*c13;
684 fCcy-=k00*c04+k01*c14;
686 fCzz-=k10*c01+k11*fCzz;
687 fCez-=k10*c02+k11*c12; fCtz-=k10*c03+k11*c13;
688 fCcz-=k10*c04+k11*c14;
690 fCee-=k20*c02+k21*c12; fCte-=k20*c03+k21*c13;
691 fCce-=k20*c04+k21*c14;
693 fCtt-=k30*c03+k31*c13;
694 fCct-=k40*c03+k41*c13;
695 //fCct-=k30*c04+k31*c14; // symmetric formula MI
697 fCcc-=k40*c04+k41*c14;
699 Int_t n=GetNumberOfClusters();
701 SetNumberOfClusters(n+1);
703 SetChi2(GetChi2()+chisq);
704 // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl;
708 //_____________________________________________________________________________
709 Int_t AliTRDtrack::UpdateMI(const AliTRDcluster *c, Double_t chisq, UInt_t index, Double_t h01,
712 // Assignes found cluster to the track and updates track information
714 Bool_t fNoTilt = kTRUE;
715 if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE;
716 // add angular effect to the error contribution and make correction - MI
717 //AliTRDclusterCorrection *corrector = AliTRDclusterCorrection::GetCorrection();
719 Double_t tangent2 = (fC*fX-fE)*(fC*fX-fE);
720 if (tangent2 < 0.90000){
721 tangent2 = tangent2/(1.-tangent2);
723 Double_t tangent = TMath::Sqrt(tangent2);
724 if ((fC*fX-fE)<0) tangent*=-1;
725 // Double_t correction = 0*plane;
726 Double_t errang = tangent2*0.04; //
727 Double_t errsys =0.025*0.025*20; //systematic error part
729 if (c->GetNPads()==4) extend=2;
730 //if (c->GetNPads()==5) extend=3;
731 //if (c->GetNPads()==6) extend=3;
732 //if (c->GetQ()<15) return 1;
737 correction = corrector->GetCorrection(plane,c->GetLocalTimeBin(),tangent);
738 if (TMath::Abs(correction)>0){
740 errang = corrector->GetSigma(plane,c->GetLocalTimeBin(),tangent);
742 errang += tangent2*0.04;
747 // Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12.);
749 Double_t r00=(c->GetSigmaY2() +errang+errsys)*extend, r01=0., r11=c->GetSigmaZ2()*10000.;
750 r00+=fCyy; r01+=fCzy; r11+=fCzz;
751 Double_t det=r00*r11 - r01*r01;
752 Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
754 Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11;
755 Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11;
756 Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11;
757 Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11;
758 Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11;
760 Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ;
761 Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz;
765 if (TMath::Abs(cur*fX-eta) >= 0.90000) {
766 // Int_t n=GetNumberOfClusters();
767 //if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n";
770 fY += k00*dy + k01*dz;
771 fZ += k10*dy + k11*dz;
773 //fT += k30*dy + k31*dz;
777 Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12);
779 Double_t xu_factor = 1000.; // empirical factor set by C.Xu
780 // in the first tilt version
781 dy=c->GetY() - fY; dz=c->GetZ() - fZ;
782 //dy=dy+h01*dz+correction;
784 Double_t tiltdz = dz;
785 if (TMath::Abs(tiltdz)>padlength/2.) {
786 tiltdz = TMath::Sign(padlength/2,dz);
792 if (TMath::Abs(dz)>padlength/2.){
793 //Double_t dy2 = c->GetY() - fY;
794 //Double_t sign = (dz>0) ? -1.: 1.;
795 //dy2-=h01*sign*padlength/2.;
799 Double_t s00 = (c->GetSigmaY2()+errang)*extend+errsys+add; // error pad
800 Double_t s11 = c->GetSigmaZ2()*xu_factor; // error pad-row
802 r00 = fCyy + 2*fCzy*h01 + fCzz*h01*h01+s00;
803 r01 = fCzy + fCzz*h01;
805 det = r00*r11 - r01*r01;
807 tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
810 k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01);
811 k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01);
812 k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01);
813 k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01);
814 k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01);
817 cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz;
818 if (TMath::Abs(cur*fX-eta) >= 0.90000) {
819 //Int_t n=GetNumberOfClusters();
820 // if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n";
823 fY += k00*dy + k01*dz;
824 fZ += k10*dy + k11*dz;
826 fT += k30*dy + k31*dz;
839 Double_t oldyy = fCyy, oldzz = fCzz; //, oldee=fCee, oldcc =fCcc;
840 Double_t oldzy = fCzy, oldey = fCey, oldty=fCty, oldcy =fCcy;
841 Double_t oldez = fCez, oldtz = fCtz, oldcz=fCcz;
842 //Double_t oldte = fCte, oldce = fCce;
843 //Double_t oldct = fCct;
845 fCyy-=k00*oldyy+k01*oldzy;
846 fCzy-=k10*oldyy+k11*oldzy;
847 fCey-=k20*oldyy+k21*oldzy;
848 fCty-=k30*oldyy+k31*oldzy;
849 fCcy-=k40*oldyy+k41*oldzy;
851 fCzz-=k10*oldzy+k11*oldzz;
852 fCez-=k20*oldzy+k21*oldzz;
853 fCtz-=k30*oldzy+k31*oldzz;
854 fCcz-=k40*oldzy+k41*oldzz;
856 fCee-=k20*oldey+k21*oldez;
857 fCte-=k30*oldey+k31*oldez;
858 fCce-=k40*oldey+k41*oldez;
860 fCtt-=k30*oldty+k31*oldtz;
861 fCct-=k40*oldty+k41*oldtz;
863 fCcc-=k40*oldcy+k41*oldcz;
866 Int_t n=GetNumberOfClusters();
868 SetNumberOfClusters(n+1);
870 SetChi2(GetChi2()+chisq);
871 // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl;
878 //_____________________________________________________________________________
879 Int_t AliTRDtrack::UpdateMI(const AliTRDtracklet &tracklet)
882 // Assignes found tracklet to the track and updates track information
885 Double_t r00=(tracklet.GetTrackletSigma2()), r01=0., r11= 10000.;
886 r00+=fCyy; r01+=fCzy; r11+=fCzz;
888 Double_t det=r00*r11 - r01*r01;
889 Double_t tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
892 Double_t dy=tracklet.GetY() - fY, dz=tracklet.GetZ() - fZ;
895 Double_t s00 = tracklet.GetTrackletSigma2(); // error pad
896 Double_t s11 = 100000; // error pad-row
897 Float_t h01 = tracklet.GetTilt();
899 // r00 = fCyy + 2*fCzy*h01 + fCzz*h01*h01+s00;
900 r00 = fCyy + fCzz*h01*h01+s00;
901 // r01 = fCzy + fCzz*h01;
904 det = r00*r11 - r01*r01;
906 tmp=r00; r00=r11/det; r11=tmp/det; r01=-r01/det;
908 Double_t k00=fCyy*r00+fCzy*r01, k01=fCyy*r01+fCzy*r11;
909 Double_t k10=fCzy*r00+fCzz*r01, k11=fCzy*r01+fCzz*r11;
910 Double_t k20=fCey*r00+fCez*r01, k21=fCey*r01+fCez*r11;
911 Double_t k30=fCty*r00+fCtz*r01, k31=fCty*r01+fCtz*r11;
912 Double_t k40=fCcy*r00+fCcz*r01, k41=fCcy*r01+fCcz*r11;
915 // k00=fCyy*r00+fCzy*(r01+h01*r00),k01=fCyy*r01+fCzy*(r11+h01*r01);
916 // k10=fCzy*r00+fCzz*(r01+h01*r00),k11=fCzy*r01+fCzz*(r11+h01*r01);
917 // k20=fCey*r00+fCez*(r01+h01*r00),k21=fCey*r01+fCez*(r11+h01*r01);
918 // k30=fCty*r00+fCtz*(r01+h01*r00),k31=fCty*r01+fCtz*(r11+h01*r01);
919 // k40=fCcy*r00+fCcz*(r01+h01*r00),k41=fCcy*r01+fCcz*(r11+h01*r01);
922 Double_t cur=fC + k40*dy + k41*dz, eta=fE + k20*dy + k21*dz;
923 // cur=fC + k40*dy + k41*dz; eta=fE + k20*dy + k21*dz;
924 if (TMath::Abs(cur*fX-eta) >= 0.90000) {
925 //Int_t n=GetNumberOfClusters();
926 // if (n>4) cerr<<n<<" AliTRDtrack warning: Filtering failed !\n";
936 fY += k00*dy + k01*dz;
937 fZ += k10*dy + k11*dz;
939 fT += k30*dy + k31*dz;
946 Double_t oldyy = fCyy, oldzz = fCzz; //, oldee=fCee, oldcc =fCcc;
947 Double_t oldzy = fCzy, oldey = fCey, oldty=fCty, oldcy =fCcy;
948 Double_t oldez = fCez, oldtz = fCtz, oldcz=fCcz;
949 //Double_t oldte = fCte, oldce = fCce;
950 //Double_t oldct = fCct;
952 fCyy-=k00*oldyy+k01*oldzy;
953 fCzy-=k10*oldyy+k11*oldzy;
954 fCey-=k20*oldyy+k21*oldzy;
955 fCty-=k30*oldyy+k31*oldzy;
956 fCcy-=k40*oldyy+k41*oldzy;
958 fCzz-=k10*oldzy+k11*oldzz;
959 fCez-=k20*oldzy+k21*oldzz;
960 fCtz-=k30*oldzy+k31*oldzz;
961 fCcz-=k40*oldzy+k41*oldzz;
963 fCee-=k20*oldey+k21*oldez;
964 fCte-=k30*oldey+k31*oldez;
965 fCce-=k40*oldey+k41*oldez;
967 fCtt-=k30*oldty+k31*oldtz;
968 fCct-=k40*oldty+k41*oldtz;
970 fCcc-=k40*oldcy+k41*oldcz;
973 Int_t n=GetNumberOfClusters();
975 SetNumberOfClusters(n+1);
977 SetChi2(GetChi2()+chisq);
978 // cerr<<"in update: fIndex["<<fN<<"] = "<<index<<endl;
985 //_____________________________________________________________________________
986 Int_t AliTRDtrack::Rotate(Double_t alpha, Bool_t absolute)
988 // Rotates track parameters in R*phi plane
989 // if absolute rotation alpha is in global system
990 // otherwise alpha rotation is relative to the current rotation angle
1000 if (fAlpha<-TMath::Pi()) fAlpha += 2*TMath::Pi();
1001 if (fAlpha>=TMath::Pi()) fAlpha -= 2*TMath::Pi();
1003 Double_t x1=fX, y1=fY;
1004 Double_t ca=cos(alpha), sa=sin(alpha);
1005 Double_t r1=fC*fX - fE;
1009 if((r1*r1) > 1) return 0;
1010 fE=fE*ca + (fC*y1 + sqrt(1.- r1*r1))*sa;
1012 Double_t r2=fC*fX - fE;
1013 if (TMath::Abs(r2) >= 0.90000) {
1014 Int_t n=GetNumberOfClusters();
1015 if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !\n";
1019 if((r2*r2) > 1) return 0;
1020 Double_t y0=fY + sqrt(1.- r2*r2)/fC;
1021 if ((fY-y0)*fC >= 0.) {
1022 Int_t n=GetNumberOfClusters();
1023 if (n>4) cerr<<n<<" AliTRDtrack warning: Rotation failed !!!\n";
1028 Double_t f00=ca-1, f24=(y1 - r1*x1/sqrt(1.- r1*r1))*sa,
1029 f20=fC*sa, f22=(ca + sa*r1/sqrt(1.- r1*r1))-1;
1032 Double_t b00=fCyy*f00, b02=fCyy*f20+fCcy*f24+fCey*f22;
1033 Double_t b10=fCzy*f00, b12=fCzy*f20+fCcz*f24+fCez*f22;
1034 Double_t b20=fCey*f00, b22=fCey*f20+fCce*f24+fCee*f22;
1035 Double_t b30=fCty*f00, b32=fCty*f20+fCct*f24+fCte*f22;
1036 Double_t b40=fCcy*f00, b42=fCcy*f20+fCcc*f24+fCce*f22;
1039 Double_t a00=f00*b00, a02=f00*b02, a22=f20*b02+f24*b42+f22*b22;
1041 //F*C*Ft = C + (a + b + bt)
1042 fCyy += a00 + 2*b00;
1044 fCey += a02+b20+b02;
1049 fCee += a22 + 2*b22;
1056 //_____________________________________________________________________________
1057 Double_t AliTRDtrack::GetPredictedChi2(const AliTRDcluster *c, Double_t h01) const
1060 Bool_t fNoTilt = kTRUE;
1061 if(TMath::Abs(h01) > 0.003) fNoTilt = kFALSE;
1062 Double_t chi2, dy, r00, r01, r11;
1066 r00=c->GetSigmaY2();
1070 Double_t padlength = TMath::Sqrt(c->GetSigmaZ2()*12);
1072 r00=c->GetSigmaY2(); r01=0.; r11=c->GetSigmaZ2();
1073 r00+=fCyy; r01+=fCzy; r11+=fCzz;
1075 Double_t det=r00*r11 - r01*r01;
1076 if (TMath::Abs(det) < 1.e-10) {
1077 Int_t n=GetNumberOfClusters();
1078 if (n>4) cerr<<n<<" AliTRDtrack warning: Singular matrix !\n";
1081 Double_t tmp=r00; r00=r11; r11=tmp; r01=-r01;
1082 Double_t dy=c->GetY() - fY, dz=c->GetZ() - fZ;
1083 Double_t tiltdz = dz;
1084 if (TMath::Abs(tiltdz)>padlength/2.) {
1085 tiltdz = TMath::Sign(padlength/2,dz);
1090 chi2 = (dy*r00*dy + 2*r01*dy*dz + dz*r11*dz)/det;
1096 //_________________________________________________________________________
1097 void AliTRDtrack::GetPxPyPz(Double_t& px, Double_t& py, Double_t& pz) const
1099 // Returns reconstructed track momentum in the global system.
1101 Double_t pt=TMath::Abs(GetPt()); // GeV/c
1102 Double_t r=fC*fX-fE;
1105 if(r > 1) { py = pt; px = 0; }
1106 else if(r < -1) { py = -pt; px = 0; }
1108 y0=fY + sqrt(1.- r*r)/fC;
1109 px=-pt*(fY-y0)*fC; //cos(phi);
1110 py=-pt*(fE-fX*fC); //sin(phi);
1113 Double_t tmp=px*TMath::Cos(fAlpha) - py*TMath::Sin(fAlpha);
1114 py=px*TMath::Sin(fAlpha) + py*TMath::Cos(fAlpha);
1119 //_________________________________________________________________________
1120 void AliTRDtrack::GetGlobalXYZ(Double_t& x, Double_t& y, Double_t& z) const
1122 // Returns reconstructed track coordinates in the global system.
1124 x = fX; y = fY; z = fZ;
1125 Double_t tmp=x*TMath::Cos(fAlpha) - y*TMath::Sin(fAlpha);
1126 y=x*TMath::Sin(fAlpha) + y*TMath::Cos(fAlpha);
1131 //_________________________________________________________________________
1132 void AliTRDtrack::ResetCovariance() {
1134 // Resets covariance matrix
1139 fCey=0.; fCez=0.; fCee*=10.;
1140 fCty=0.; fCtz=0.; fCte=0.; fCtt*=10.;
1141 fCcy=0.; fCcz=0.; fCce=0.; fCct=0.; fCcc*=10.;
1144 void AliTRDtrack::ResetCovariance(Float_t mult) {
1146 // Resets covariance matrix
1151 fCey*=0.; fCez*=0.; fCee*=mult;
1152 fCty*=0.; fCtz*=0.; fCte*=0.; fCtt*=1.;
1153 fCcy*=0.; fCcz*=0.; fCce*=0.; fCct*=0.; fCcc*=mult;
1160 void AliTRDtrack::MakeBackupTrack()
1164 if (fBackupTrack) delete fBackupTrack;
1165 fBackupTrack = new AliTRDtrack(*this);
1169 Int_t AliTRDtrack::GetProlongation(Double_t xk, Double_t &y, Double_t &z){
1171 // Find prolongation at given x
1172 // return 0 if not exist
1174 Double_t c1=fC*fX - fE;
1175 if (TMath::Abs(c1)>1.) return 0;
1176 Double_t r1=TMath::Sqrt(1.- c1*c1);
1177 Double_t c2=fC*xk - fE;
1178 if (TMath::Abs(c2)>1.) return 0;
1179 Double_t r2=TMath::Sqrt(1.- c2*c2);
1180 y =fY + (xk-fX)*(c1+c2)/(r1+r2);
1181 z =fZ + (xk-fX)*(c1+c2)/(c1*r2 + c2*r1)*fT;
1188 Int_t AliTRDtrack::PropagateToX(Double_t xr, Double_t step)
1191 // Propagate track to given x position
1192 // works inside of the 20 degree segmentation (local cooordinate frame for TRD , TPC, TOF)
1194 // material budget from geo manager
1196 Double_t xyz0[3], xyz1[3],y,z;
1197 const Double_t alphac = TMath::Pi()/9.;
1198 const Double_t talphac = TMath::Tan(alphac*0.5);
1199 // critical alpha - cross sector indication
1201 Double_t dir = (fX>xr) ? -1.:1.;
1203 for (Double_t x=fX+dir*step;dir*x<dir*xr;x+=dir*step){
1205 GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);
1206 GetProlongation(x,y,z);
1207 xyz1[0] = x*TMath::Cos(fAlpha)+y*TMath::Sin(fAlpha);
1208 xyz1[1] = x*TMath::Sin(fAlpha)-y*TMath::Cos(fAlpha);
1211 AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param);
1213 if (param[0]>0&¶m[1]>0) PropagateTo(x,param[1],param[0]);
1217 if (fY<-fX*talphac){
1227 Int_t AliTRDtrack::PropagateToR(Double_t r,Double_t step)
1230 // propagate track to the radial position
1231 // rotation always connected to the last track position
1233 Double_t xyz0[3], xyz1[3],y,z;
1234 Double_t radius = TMath::Sqrt(fX*fX+fY*fY);
1235 Double_t dir = (radius>r) ? -1.:1.; // direction +-
1237 for (Double_t x=radius+dir*step;dir*x<dir*r;x+=dir*step){
1238 GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);
1239 Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
1240 Rotate(alpha,kTRUE);
1241 GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);
1242 GetProlongation(x,y,z);
1243 xyz1[0] = x*TMath::Cos(alpha)+y*TMath::Sin(alpha);
1244 xyz1[1] = x*TMath::Sin(alpha)-y*TMath::Cos(alpha);
1247 AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param);
1248 if (param[1]<=0) param[1] =100000000;
1249 PropagateTo(x,param[1],param[0]);
1251 GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);
1252 Double_t alpha = TMath::ATan2(xyz0[1],xyz0[0]);
1253 Rotate(alpha,kTRUE);
1254 GetGlobalXYZ(xyz0[0],xyz0[1],xyz0[2]);
1255 GetProlongation(r,y,z);
1256 xyz1[0] = r*TMath::Cos(alpha)+y*TMath::Sin(alpha);
1257 xyz1[1] = r*TMath::Sin(alpha)-y*TMath::Cos(alpha);
1260 AliKalmanTrack::MeanMaterialBudget(xyz0,xyz1,param);
1262 if (param[1]<=0) param[1] =100000000;
1263 PropagateTo(r,param[1],param[0]);