- added the ITS clusters/track in the track properties
[u/mrichter/AliRoot.git] / TOF / AliTOFtrack.cxx
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74ea065c 1/**************************************************************************
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4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
74ea065c 15
0e46b9ae 16/* $Id$ */
d3c7bfac 17
0e46b9ae 18/////////////////////////////////////////////////////////////////////////////
19// //
20// AliTOFtrack class //
21// //
22// Authors: Bologna-CERN-ITEP-Salerno Group //
23// //
24// Description: class for handling ESD extracted tracks for TOF matching. //
25// //
26/////////////////////////////////////////////////////////////////////////////
d3c7bfac 27
74ea065c 28#include "AliESDtrack.h"
6c94f330 29#include "AliTracker.h"
74ea065c 30
0e46b9ae 31#include "AliTOFGeometry.h"
d3c7bfac 32#include "AliTOFtrack.h"
33
74ea065c 34ClassImp(AliTOFtrack)
35
36//_____________________________________________________________________________
655e379f 37AliTOFtrack::AliTOFtrack() :
38 AliKalmanTrack(),
39 fSeedInd(-1),
ba66add8 40 fSeedLab(-1)
6c94f330 41{
74ea065c 42 //
6c94f330 43 // Default constructor.
74ea065c 44 //
6c94f330 45}
74ea065c 46
6c94f330 47//_____________________________________________________________________________
48AliTOFtrack::AliTOFtrack(const AliTOFtrack& t) :
49 AliKalmanTrack(t),
50 fSeedInd(t.fSeedInd),
ba66add8 51 fSeedLab(t.fSeedLab)
6c94f330 52{
53 //
54 // Copy constructor.
55 //
74ea065c 56}
57
58//_____________________________________________________________________________
6c94f330 59AliTOFtrack::AliTOFtrack(const AliESDtrack& t) :
60 AliKalmanTrack(),
655e379f 61 fSeedInd(-1),
ba66add8 62 fSeedLab(-1)
6c94f330 63{
74ea065c 64 //
65 // Constructor from AliESDtrack
66 //
74ea065c 67 SetLabel(t.GetLabel());
68 SetChi2(0.);
69 SetMass(t.GetMass());
70
6c94f330 71 Set(t.GetX(),t.GetAlpha(),t.GetParameter(),t.GetCovariance());
74ea065c 72
73 if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return;
74 StartTimeIntegral();
75 Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times);
76 SetIntegratedLength(t.GetIntegratedLength());
77
74ea065c 78}
7aeeaf38 79
80//____________________________________________________________________________
2f584d46 81AliTOFtrack& AliTOFtrack::operator=(const AliTOFtrack &/*source*/)
7aeeaf38 82{
83 // ass. op.
84
7aeeaf38 85 return *this;
86
87}
88
74ea065c 89//_____________________________________________________________________________
6c94f330 90Bool_t AliTOFtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho)
18f005ac 91 {
92 //
74ea065c 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
18f005ac 95 //
74ea065c 96
6c94f330 97 if (xk == GetX()) return kTRUE;
74ea065c 98
6c94f330 99 Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ();
74ea065c 100
c4eac485 101 Double_t b[3];GetBxByBz(b);
102 if (!AliExternalTrackParam::PropagateToBxByBz(xk,b)) return kFALSE;
103 // OLD used code
104 //Double_t bz=GetBz();
105 //if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE;
74ea065c 106
6c94f330 107 Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) +
108 (GetY()-oldY)*(GetY()-oldY) +
109 (GetZ()-oldZ)*(GetZ()-oldZ));
110 if (IsStartedTimeIntegral() && GetX()>oldX) AddTimeStep(d);
111
112 if (!AliExternalTrackParam::CorrectForMaterial(d*rho/x0,x0,GetMass()))
113 return kFALSE;
74ea065c 114
74ea065c 115 /*
74ea065c 116 //Energy losses************************
117 if((5940*beta2/(1-beta2+1e-10) - beta2) < 0){return 0;}
118
119 Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2+1e-10)) - beta2)*d*rho;
983ebc4f 120 //
121 // suspicious part - think about it ?
122 Double_t kinE = TMath::Sqrt(p2);
123 if (dE>0.8*kinE) dE = 0.8*kinE; //
124 if (dE<0) dE = 0.0; // not valid region for Bethe bloch
6c94f330 125 */
74ea065c 126
6c94f330 127 return kTRUE;
74ea065c 128}
129
130//_____________________________________________________________________________
ba4161e8 131Bool_t AliTOFtrack::PropagateToInnerTOF()
74ea065c 132{
133 // Propagates a track of particle with mass=pm to a reference plane
134 // defined by x=xk through media of density=rho and radiationLength=x0
135
136
ba66add8 137 Double_t ymax=AliTOFGeometry::RinTOF()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha());
74ea065c 138 Bool_t skip = kFALSE;
ba66add8 139 Double_t y=GetYat(AliTOFGeometry::RinTOF(),skip);
6c94f330 140 if (skip) {
141 return kFALSE;
74ea065c 142 }
143 if (y > ymax) {
2c770f53 144 if (!Rotate(AliTOFGeometry::GetAlpha())) {
6c94f330 145 return kFALSE;
74ea065c 146 }
147 } else if (y <-ymax) {
2c770f53 148 if (!Rotate(-AliTOFGeometry::GetAlpha())) {
6c94f330 149 return kFALSE;
74ea065c 150 }
151 }
152
153
2c770f53 154 Double_t x = GetX();
b3e52baa 155 Int_t nsteps=Int_t((AliTOFGeometry::Rmin()-x)/0.5); // 0.5 cm Steps
74ea065c 156 for (Int_t istep=0;istep<nsteps;istep++){
157 Float_t xp = x+istep*0.5;
158 Double_t param[2];
ba4161e8 159 GetPropagationParameters(param);
2c770f53 160 PropagateTo(xp,param[0],param[1]);
74ea065c 161
162 }
163
ba66add8 164 if(!PropagateTo(AliTOFGeometry::RinTOF()))return 0;
74ea065c 165
6c94f330 166 return kTRUE;
74ea065c 167
168}
169
2c770f53 170//_________________________________________________________________________
ac359ffe 171Double_t AliTOFtrack::GetPredictedChi2(const AliCluster3D *c) const {
172 //
18f005ac 173 // Estimate the chi2 of the space point "c" with its cov. matrix elements
ac359ffe 174 //
18f005ac 175
ac359ffe 176 Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
177 Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
178 Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
179 return AliExternalTrackParam::GetPredictedChi2(p, covyz, covxyz);
180}
181//_________________________________________________________________________
182Bool_t AliTOFtrack::PropagateTo(const AliCluster3D *c) {
183 //
18f005ac 184 // Propagates a track to the plane containing cluster 'c'
ac359ffe 185 //
186 Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ();
187 Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
188 Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
189 Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
190 Double_t bz=GetBz();
191 if (!AliExternalTrackParam::PropagateTo(p, covyz, covxyz, bz)) return kFALSE;
192 if (IsStartedTimeIntegral()) {
193 Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) +
194 (GetY()-oldY)*(GetY()-oldY) +
195 (GetZ()-oldZ)*(GetZ()-oldZ));
196 if (GetX()<oldX) d=-d;
197 AddTimeStep(d);
198 }
199 return kTRUE;
200}
201//_________________________________________________________________________
4668c628 202Double_t AliTOFtrack::GetYat(Double_t xk, Bool_t & skip) const {
2c770f53 203//-----------------------------------------------------------------
204// This function calculates the Y-coordinate of a track at the plane x=xk.
205// Needed for matching with the TOF (I.Belikov)
206//-----------------------------------------------------------------
6c94f330 207 Double_t y=0.;
208 skip=(!GetYAt(xk,GetBz(),y));
209 return y;
2c770f53 210}
74ea065c 211
212//_____________________________________________________________________________
213Int_t AliTOFtrack::Compare(const TObject *o) const {
214 //-----------------------------------------------------------------
215 // This function compares tracks according to the their curvature
216 //-----------------------------------------------------------------
217 AliTOFtrack *t=(AliTOFtrack*)o;
218 Double_t co=t->GetSigmaY2()*t->GetSigmaZ2();
219 Double_t c =GetSigmaY2()*GetSigmaZ2();
220 if (c>co) return 1;
221 else if (c<co) return -1;
222 return 0;
223}
224
6c94f330 225
74ea065c 226//_____________________________________________________________________________
ba4161e8 227void AliTOFtrack::GetPropagationParameters(Double_t *param) {
74ea065c 228
2c770f53 229 //Get average medium density, x0 while propagating the track
230
231 //For TRD holes description
ba4161e8 232 /*
74ea065c 233 Double_t thetamin = (90.-31.1) * TMath::Pi()/180.;
234 Double_t thetamax = (90.+31.1) * TMath::Pi()/180.;
235
236 Double_t zmin = -55.;
237 Double_t zmax = 55.;
ba4161e8 238 */
74ea065c 239
2c770f53 240 // Detector inner/outer radii
74ea065c 241 Double_t rTPC = 261.53;
242 Double_t rTPCTRD = 294.5;
243 Double_t rTRD = 369.1;
244
2c770f53 245 // Medium parameters
74ea065c 246 Double_t x0TPC = 40.;
247 Double_t rhoTPC =0.06124;
248
249 Double_t x0Air = 36.66;
250 Double_t rhoAir =1.2931e-3;
251
252 Double_t x0TRD = 171.7;
253 Double_t rhoTRD =0.33;
254
ba4161e8 255 // Int_t isec = GetSector();
6c94f330 256 Double_t r[3]; GetXYZ(r);
ba4161e8 257 // Float_t thetatr = TMath::ATan2(TMath::Sqrt(r[0]*r[0]+r[1]*r[1]),r[2]);
74ea065c 258
ba4161e8 259 /*
74ea065c 260 if(holes){
261 if (isec == 0 || isec == 1 || isec == 2 ) {
262 if( thetatr>=thetamin && thetatr<=thetamax){
263 x0TRD= x0Air;
264 rhoTRD = rhoAir;
265 }
266 }
267 if (isec == 11 || isec == 12 || isec == 13 || isec == 14 || isec == 15 ) {
6c94f330 268 if( r[2]>=zmin && r[2]<=zmax){
74ea065c 269 x0TRD= x0Air;
270 rhoTRD = rhoAir;
271 }
272 }
273 }
ba4161e8 274 */
2c770f53 275 if(GetX() <= rTPC)
74ea065c 276 {param[0]=x0TPC;param[1]=rhoTPC;}
2c770f53 277 else if(GetX() > rTPC && GetX() < rTPCTRD)
74ea065c 278 {param[0]=x0Air;param[1]=rhoAir;}
2c770f53 279 else if(GetX() >= rTPCTRD && GetX() < rTRD)
74ea065c 280 {param[0]=x0TRD;param[1]=rhoTRD;}
2c770f53 281 else if(GetX() >= rTRD )
74ea065c 282 {param[0]=x0Air;param[1]=rhoAir;}
74ea065c 283}