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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());
71 Set(t.GetX(),t.GetAlpha(),t.GetParameter(),t.GetCovariance());
73 if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return;
75 Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times);
76 SetIntegratedLength(t.GetIntegratedLength());
80 //____________________________________________________________________________
81 AliTOFtrack& AliTOFtrack::operator=(const AliTOFtrack &/*source*/)
89 //_____________________________________________________________________________
90 Bool_t AliTOFtrack::PropagateTo(Double_t xk,Double_t /*x0*/,Double_t /*rho*/)
93 // Propagates a track of particle with mass=pm to a reference plane
94 // defined by x=xk through media of density=rho and radiationLength=x0
97 if (xk == GetX()) return kTRUE;
99 Double_t oldX=GetX();//, oldY=GetY(), oldZ=GetZ();
100 Double_t start[3], end[3], mparam[7];
102 /* get start position */
105 /* propagate the track */
106 Double_t b[3];GetBxByBz(b);
107 if (!AliExternalTrackParam::PropagateToBxByBz(xk,b)) return kFALSE;
109 //Double_t bz=GetBz();
110 //if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE;
112 /* get end position */
115 /* add time step to integral */
117 Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) +
118 (GetY()-oldY)*(GetY()-oldY) +
119 (GetZ()-oldZ)*(GetZ()-oldZ));
120 if (IsStartedTimeIntegral() && GetX()>oldX) AddTimeStep(d);
122 Double_t d = TMath::Sqrt((end[0]-start[0])*(end[0]-start[0]) +
123 (end[1]-start[1])*(end[1]-start[1]) +
124 (end[2]-start[2])*(end[2]-start[2]));
125 if (IsStartedTimeIntegral() && GetX()>oldX) AddTimeStep(d);
127 /* get material budget from tracker */
128 AliTracker::MeanMaterialBudget(start, end, mparam);
129 Double_t xTimesRho = mparam[4]*mparam[0];
130 if (oldX < xk) { // CZ
131 xTimesRho = -xTimesRho; // it should be negative in case of outward
132 // propagation (--> energy decreases)
134 Double_t xOverX0 = mparam[1];
136 /* correct for mean material */
137 if (!AliExternalTrackParam::CorrectForMeanMaterial(xOverX0,xTimesRho,GetMass())) return kFALSE;
141 if (!AliExternalTrackParam::CorrectForMaterial(d*rho/x0,x0,GetMass()))
146 //Energy losses************************
147 if((5940*beta2/(1-beta2+1e-10) - beta2) < 0){return 0;}
149 Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2+1e-10)) - beta2)*d*rho;
151 // suspicious part - think about it ?
152 Double_t kinE = TMath::Sqrt(p2);
153 if (dE>0.8*kinE) dE = 0.8*kinE; //
154 if (dE<0) dE = 0.0; // not valid region for Bethe bloch
160 //_____________________________________________________________________________
161 Bool_t AliTOFtrack::PropagateToInnerTOF()
163 // Propagates a track of particle with mass=pm to a reference plane
164 // defined by x=xk through media of density=rho and radiationLength=x0
166 //const Double_t kAlphac = TMath::Pi()/9.0; // 20 degree
167 const Double_t kAlphac = AliTOFGeometry::GetAlpha(); // 20 degree
168 const Double_t kTalphac = TMath::Tan(kAlphac*0.5);
170 //const Double_t kStepSize = 0.1; // [cm] Step size
171 const Double_t kStepSize = 0.5; // [cm] Step size
174 //Double_t bz = GetBz();
181 Int_t nsteps = (Int_t)((AliTOFGeometry::Rmin()-x)/kStepSize);
182 for (Int_t istep=0; istep<nsteps; istep++){
184 // Critical alpha - cross sector indication
186 Double_t dir = (GetX() > AliTOFGeometry::Rmin()) ? -1.0 : 1.0;
188 x = GetX()+dir*kStepSize;
189 if ( x<GetX() && GetX()<AliTOFGeometry::Rmin()) {
190 AliDebug(1,Form("Track doesn't reach rho=%f",AliTOFGeometry::Rmin()));
196 //GetXYZAt(x,bz,xyz1);
197 //AliExternalTrackParam::GetYAt(x,bz,y);
198 //AliExternalTrackParam::GetZAt(x,bz,z);
200 if (!(PropagateTo(x,0.,0.))) { /* passing 0.,0. as arguments since now
201 this method queries TGeo for material budget
206 if (GetY() > GetX()*kTalphac) {
207 if (!(Rotate(kAlphac))) return kFALSE;
208 } else if (GetY() < -GetX()*kTalphac) {
209 if (!(Rotate(-kAlphac))) return kFALSE;
214 //Bool_t check = PropagateTo(AliTOFGeometry::RinTOF());
215 Bool_t check = PropagateTo(AliTOFGeometry::RinTOF(),0.,0.); /* passing 0.,0. as arguments since now
216 this method queries TGeo for material budget
219 if (!check) return kFALSE;
221 if (GetY() > GetX()*kTalphac) {
222 if (!(Rotate(kAlphac))) return kFALSE;
223 } else if (GetY() < -GetX()*kTalphac) {
224 if (!(Rotate(-kAlphac))) return kFALSE;
231 //_____________________________________________________________________________
232 Bool_t AliTOFtrack::PropagateToInnerTOFold()
234 // Propagates a track of particle with mass=pm to a reference plane
235 // defined by x=xk through media of density=rho and radiationLength=x0
238 Double_t ymax=AliTOFGeometry::RinTOF()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha());
239 Bool_t skip = kFALSE;
240 Double_t y=GetYat(AliTOFGeometry::RinTOF(),skip);
245 if (!Rotate(AliTOFGeometry::GetAlpha())) return kFALSE;
246 } else if (y <-ymax) {
247 if (!Rotate(-AliTOFGeometry::GetAlpha())) return kFALSE;
251 Int_t nsteps=Int_t((AliTOFGeometry::Rmin()-x)/0.5); // 0.5 cm Steps
252 for (Int_t istep=0;istep<nsteps;istep++){
253 Float_t xp = x+istep*0.5;
254 // GetPropagationParameters(param);
255 if (!(PropagateTo(xp,0.,0.))) { /* passing 0.,0. as arguments since now
256 this method queries TGeo for material budget
263 if (!(PropagateTo(AliTOFGeometry::RinTOF()))) return kFALSE;
269 //_________________________________________________________________________
270 Double_t AliTOFtrack::GetPredictedChi2(const AliCluster3D *c) const {
272 // Estimate the chi2 of the space point "c" with its cov. matrix elements
275 Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
276 Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
277 Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
278 return AliExternalTrackParam::GetPredictedChi2(p, covyz, covxyz);
280 //_________________________________________________________________________
281 Bool_t AliTOFtrack::PropagateTo(const AliCluster3D *c) {
283 // Propagates a track to the plane containing cluster 'c'
285 Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ();
286 Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
287 Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
288 Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
290 if (!AliExternalTrackParam::PropagateTo(p, covyz, covxyz, bz)) return kFALSE;
291 if (IsStartedTimeIntegral()) {
292 Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) +
293 (GetY()-oldY)*(GetY()-oldY) +
294 (GetZ()-oldZ)*(GetZ()-oldZ));
295 if (GetX()<oldX) d=-d;
300 if (GetY() > GetX()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha())) {
301 if (!(Rotate(AliTOFGeometry::GetAlpha()))) return kFALSE;
302 } else if (GetY() < -GetX()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha())) {
303 if (!(Rotate(-AliTOFGeometry::GetAlpha()))) return kFALSE;
308 //_________________________________________________________________________
309 Double_t AliTOFtrack::GetYat(Double_t xk, Bool_t & skip) const {
310 //-----------------------------------------------------------------
311 // This function calculates the Y-coordinate of a track at the plane x=xk.
312 // Needed for matching with the TOF (I.Belikov)
313 //-----------------------------------------------------------------
315 skip=(!GetYAt(xk,GetBz(),y));
319 //_____________________________________________________________________________
320 Int_t AliTOFtrack::Compare(const TObject *o) const {
321 //-----------------------------------------------------------------
322 // This function compares tracks according to the their curvature
323 //-----------------------------------------------------------------
324 AliTOFtrack *t=(AliTOFtrack*)o;
325 Double_t co=t->GetSigmaY2()*t->GetSigmaZ2();
326 Double_t c =GetSigmaY2()*GetSigmaZ2();
328 else if (c<co) return -1;
333 //_____________________________________________________________________________
334 void AliTOFtrack::GetPropagationParameters(Double_t *param) {
336 //Get average medium density, x0 while propagating the track
338 //For TRD holes description
340 Double_t thetamin = (90.-31.1) * TMath::Pi()/180.;
341 Double_t thetamax = (90.+31.1) * TMath::Pi()/180.;
343 Double_t zmin = -55.;
347 // Detector inner/outer radii
348 Double_t rTPC = 261.53;
349 Double_t rTPCTRD = 294.5;
350 Double_t rTRD = 369.1;
353 Double_t x0TPC = 40.;
354 Double_t rhoTPC =0.06124;
356 Double_t x0Air = 36.66;
357 Double_t rhoAir =1.2931e-3;
359 Double_t x0TRD = 171.7;
360 Double_t rhoTRD =0.33;
362 // Int_t isec = GetSector();
363 Double_t r[3]; GetXYZ(r);
364 // Float_t thetatr = TMath::ATan2(TMath::Sqrt(r[0]*r[0]+r[1]*r[1]),r[2]);
368 if (isec == 0 || isec == 1 || isec == 2 ) {
369 if( thetatr>=thetamin && thetatr<=thetamax){
374 if (isec == 11 || isec == 12 || isec == 13 || isec == 14 || isec == 15 ) {
375 if( r[2]>=zmin && r[2]<=zmax){
383 {param[0]=x0TPC;param[1]=rhoTPC;}
384 else if(GetX() > rTPC && GetX() < rTPCTRD)
385 {param[0]=x0Air;param[1]=rhoAir;}
386 else if(GetX() >= rTPCTRD && GetX() < rTRD)
387 {param[0]=x0TRD;param[1]=rhoTRD;}
388 else if(GetX() >= rTRD )
389 {param[0]=x0Air;param[1]=rhoAir;}