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4 * Author: The ALICE Off-line Project. *
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14 **************************************************************************/
18 /////////////////////////////////////////////////////////////////////////////
20 // AliTOFtrack class //
22 // Authors: Bologna-CERN-ITEP-Salerno Group //
24 // Description: class for handling ESD extracted tracks for TOF matching. //
26 /////////////////////////////////////////////////////////////////////////////
28 #include "AliESDtrack.h"
29 #include "AliTracker.h"
31 #include "AliTOFGeometry.h"
32 #include "AliTOFtrack.h"
36 //_____________________________________________________________________________
37 AliTOFtrack::AliTOFtrack() :
43 // Default constructor.
47 //_____________________________________________________________________________
48 AliTOFtrack::AliTOFtrack(const AliTOFtrack& t) :
58 //_____________________________________________________________________________
59 AliTOFtrack::AliTOFtrack(const AliESDtrack& t) :
65 // Constructor from AliESDtrack
67 SetLabel(t.GetLabel());
69 SetMass(t.GetMassForTracking());
71 Set(t.GetX(),t.GetAlpha(),t.GetParameter(),t.GetCovariance());
73 if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return;
76 for(Int_t isp=0;isp<AliPID::kSPECIESC;isp++){
77 times[isp] = t.GetIntegratedTimesOld(isp); // in ps
80 SetIntegratedTimes(times);
81 SetIntegratedLength(t.GetIntegratedLengthOld());
85 //____________________________________________________________________________
86 AliTOFtrack& AliTOFtrack::operator=(const AliTOFtrack &/*source*/)
94 //_____________________________________________________________________________
95 Bool_t AliTOFtrack::PropagateTo(Double_t xk,Double_t /*x0*/,Double_t /*rho*/)
98 // Propagates a track of particle with mass=pm to a reference plane
99 // defined by x=xk through media of density=rho and radiationLength=x0
102 if (xk == GetX()) return kTRUE;
104 Double_t oldX=GetX();//, oldY=GetY(), oldZ=GetZ();
105 Double_t start[3], end[3], mparam[7];
107 /* get start position */
110 /* propagate the track */
111 Double_t b[3];GetBxByBz(b);
112 if (!AliExternalTrackParam::PropagateToBxByBz(xk,b)) return kFALSE;
114 //Double_t bz=GetBz();
115 //if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE;
117 /* get end position */
120 /* add time step to integral */
122 Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) +
123 (GetY()-oldY)*(GetY()-oldY) +
124 (GetZ()-oldZ)*(GetZ()-oldZ));
125 if (IsStartedTimeIntegral() && GetX()>oldX) AddTimeStep(d);
127 Double_t d = TMath::Sqrt((end[0]-start[0])*(end[0]-start[0]) +
128 (end[1]-start[1])*(end[1]-start[1]) +
129 (end[2]-start[2])*(end[2]-start[2]));
130 if (IsStartedTimeIntegral() && GetX()>oldX) AddTimeStep(d);
132 /* get material budget from tracker */
133 AliTracker::MeanMaterialBudget(start, end, mparam);
134 Double_t xTimesRho = mparam[4]*mparam[0];
135 if (oldX < xk) { // CZ
136 xTimesRho = -xTimesRho; // it should be negative in case of outward
137 // propagation (--> energy decreases)
139 Double_t xOverX0 = mparam[1];
141 /* correct for mean material */
142 if (!AliExternalTrackParam::CorrectForMeanMaterial(xOverX0,xTimesRho,GetMass())) return kFALSE;
146 if (!AliExternalTrackParam::CorrectForMaterial(d*rho/x0,x0,GetMass()))
151 //Energy losses************************
152 if((5940*beta2/(1-beta2+1e-10) - beta2) < 0){return 0;}
154 Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2+1e-10)) - beta2)*d*rho;
156 // suspicious part - think about it ?
157 Double_t kinE = TMath::Sqrt(p2);
158 if (dE>0.8*kinE) dE = 0.8*kinE; //
159 if (dE<0) dE = 0.0; // not valid region for Bethe bloch
165 //_____________________________________________________________________________
166 Bool_t AliTOFtrack::PropagateToInnerTOF()
168 // Propagates a track of particle with mass=pm to a reference plane
169 // defined by x=xk through media of density=rho and radiationLength=x0
171 //const Double_t kAlphac = TMath::Pi()/9.0; // 20 degree
172 const Double_t kAlphac = AliTOFGeometry::GetAlpha(); // 20 degree
173 const Double_t kTalphac = TMath::Tan(kAlphac*0.5);
175 //const Double_t kStepSize = 0.1; // [cm] Step size
176 const Double_t kStepSize = 0.5; // [cm] Step size
179 //Double_t bz = GetBz();
186 Int_t nsteps = (Int_t)((AliTOFGeometry::Rmin()-x)/kStepSize);
187 for (Int_t istep=0; istep<nsteps; istep++){
189 // Critical alpha - cross sector indication
191 Double_t dir = (GetX() > AliTOFGeometry::Rmin()) ? -1.0 : 1.0;
193 x = GetX()+dir*kStepSize;
194 if ( x<GetX() && GetX()<AliTOFGeometry::Rmin()) {
195 AliDebug(1,Form("Track doesn't reach rho=%f",AliTOFGeometry::Rmin()));
201 //GetXYZAt(x,bz,xyz1);
202 //AliExternalTrackParam::GetYAt(x,bz,y);
203 //AliExternalTrackParam::GetZAt(x,bz,z);
205 if (!(PropagateTo(x,0.,0.))) { /* passing 0.,0. as arguments since now
206 this method queries TGeo for material budget
211 if (GetY() > GetX()*kTalphac) {
212 if (!(Rotate(kAlphac))) return kFALSE;
213 } else if (GetY() < -GetX()*kTalphac) {
214 if (!(Rotate(-kAlphac))) return kFALSE;
219 //Bool_t check = PropagateTo(AliTOFGeometry::RinTOF());
220 Bool_t check = PropagateTo(AliTOFGeometry::RinTOF(),0.,0.); /* passing 0.,0. as arguments since now
221 this method queries TGeo for material budget
224 if (!check) return kFALSE;
226 if (GetY() > GetX()*kTalphac) {
227 if (!(Rotate(kAlphac))) return kFALSE;
228 } else if (GetY() < -GetX()*kTalphac) {
229 if (!(Rotate(-kAlphac))) return kFALSE;
236 //_____________________________________________________________________________
237 Bool_t AliTOFtrack::PropagateToInnerTOFold()
239 // Propagates a track of particle with mass=pm to a reference plane
240 // defined by x=xk through media of density=rho and radiationLength=x0
243 Double_t ymax=AliTOFGeometry::RinTOF()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha());
244 Bool_t skip = kFALSE;
245 Double_t y=GetYat(AliTOFGeometry::RinTOF(),skip);
250 if (!Rotate(AliTOFGeometry::GetAlpha())) return kFALSE;
251 } else if (y <-ymax) {
252 if (!Rotate(-AliTOFGeometry::GetAlpha())) return kFALSE;
256 Int_t nsteps=Int_t((AliTOFGeometry::Rmin()-x)/0.5); // 0.5 cm Steps
257 for (Int_t istep=0;istep<nsteps;istep++){
258 Float_t xp = x+istep*0.5;
259 // GetPropagationParameters(param);
260 if (!(PropagateTo(xp,0.,0.))) { /* passing 0.,0. as arguments since now
261 this method queries TGeo for material budget
268 if (!(PropagateTo(AliTOFGeometry::RinTOF()))) return kFALSE;
274 //_________________________________________________________________________
275 Double_t AliTOFtrack::GetPredictedChi2(const AliCluster3D *c) const {
277 // Estimate the chi2 of the space point "c" with its cov. matrix elements
280 Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
281 Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
282 Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
283 return AliExternalTrackParam::GetPredictedChi2(p, covyz, covxyz);
285 //_________________________________________________________________________
286 Bool_t AliTOFtrack::PropagateTo(const AliCluster3D *c) {
288 // Propagates a track to the plane containing cluster 'c'
290 Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ();
291 Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
292 Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
293 Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
295 if (!AliExternalTrackParam::PropagateTo(p, covyz, covxyz, bz)) return kFALSE;
296 if (IsStartedTimeIntegral()) {
297 Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) +
298 (GetY()-oldY)*(GetY()-oldY) +
299 (GetZ()-oldZ)*(GetZ()-oldZ));
300 if (GetX()<oldX) d=-d;
305 if (GetY() > GetX()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha())) {
306 if (!(Rotate(AliTOFGeometry::GetAlpha()))) return kFALSE;
307 } else if (GetY() < -GetX()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha())) {
308 if (!(Rotate(-AliTOFGeometry::GetAlpha()))) return kFALSE;
313 //_________________________________________________________________________
314 Double_t AliTOFtrack::GetYat(Double_t xk, Bool_t & skip) const {
315 //-----------------------------------------------------------------
316 // This function calculates the Y-coordinate of a track at the plane x=xk.
317 // Needed for matching with the TOF (I.Belikov)
318 //-----------------------------------------------------------------
320 skip=(!GetYAt(xk,GetBz(),y));
324 //_____________________________________________________________________________
325 Int_t AliTOFtrack::Compare(const TObject *o) const {
326 //-----------------------------------------------------------------
327 // This function compares tracks according to the their curvature
328 //-----------------------------------------------------------------
329 AliTOFtrack *t=(AliTOFtrack*)o;
330 Double_t co=t->GetSigmaY2()*t->GetSigmaZ2();
331 Double_t c =GetSigmaY2()*GetSigmaZ2();
333 else if (c<co) return -1;
338 //_____________________________________________________________________________
339 void AliTOFtrack::GetPropagationParameters(Double_t *param) {
341 //Get average medium density, x0 while propagating the track
343 //For TRD holes description
345 Double_t thetamin = (90.-31.1) * TMath::Pi()/180.;
346 Double_t thetamax = (90.+31.1) * TMath::Pi()/180.;
348 Double_t zmin = -55.;
352 // Detector inner/outer radii
353 Double_t rTPC = 261.53;
354 Double_t rTPCTRD = 294.5;
355 Double_t rTRD = 369.1;
358 Double_t x0TPC = 40.;
359 Double_t rhoTPC =0.06124;
361 Double_t x0Air = 36.66;
362 Double_t rhoAir =1.2931e-3;
364 Double_t x0TRD = 171.7;
365 Double_t rhoTRD =0.33;
367 // Int_t isec = GetSector();
368 Double_t r[3]; GetXYZ(r);
369 // Float_t thetatr = TMath::ATan2(TMath::Sqrt(r[0]*r[0]+r[1]*r[1]),r[2]);
373 if (isec == 0 || isec == 1 || isec == 2 ) {
374 if( thetatr>=thetamin && thetatr<=thetamax){
379 if (isec == 11 || isec == 12 || isec == 13 || isec == 14 || isec == 15 ) {
380 if( r[2]>=zmin && r[2]<=zmax){
388 {param[0]=x0TPC;param[1]=rhoTPC;}
389 else if(GetX() > rTPC && GetX() < rTPCTRD)
390 {param[0]=x0Air;param[1]=rhoAir;}
391 else if(GetX() >= rTPCTRD && GetX() < rTRD)
392 {param[0]=x0TRD;param[1]=rhoTRD;}
393 else if(GetX() >= rTRD )
394 {param[0]=x0Air;param[1]=rhoAir;}