include optional use of AliTOFtrackerV1
[u/mrichter/AliRoot.git] / TOF / AliTOFtrack.cxx
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3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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8 * documentation strictly for non-commercial purposes is hereby granted *
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13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
16/* $Id$ */
17
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/////////////////////////////////////////////////////////////////////////////
27
28#include "AliESDtrack.h"
29#include "AliTracker.h"
30
31#include "AliTOFGeometryV5.h"
32#include "AliTOFGeometry.h"
33#include "AliTOFtrack.h"
34
35ClassImp(AliTOFtrack)
36
37//_____________________________________________________________________________
38AliTOFtrack::AliTOFtrack() :
39 AliKalmanTrack(),
40 fSeedInd(-1),
41 fSeedLab(-1),
42 fTOFgeometry(0)
43{
44 //
45 // Default constructor.
46 //
47}
48
49//_____________________________________________________________________________
50AliTOFtrack::AliTOFtrack(const AliTOFtrack& t) :
51 AliKalmanTrack(t),
52 fSeedInd(t.fSeedInd),
53 fSeedLab(t.fSeedLab),
54 fTOFgeometry(new AliTOFGeometryV5())
55{
56 //
57 // Copy constructor.
58 //
59}
60
61//_____________________________________________________________________________
62AliTOFtrack::AliTOFtrack(const AliESDtrack& t) :
63 AliKalmanTrack(),
64 fSeedInd(-1),
65 fSeedLab(-1),
66 fTOFgeometry(new AliTOFGeometryV5())
67{
68 //
69 // Constructor from AliESDtrack
70 //
71 SetLabel(t.GetLabel());
72 SetChi2(0.);
73 SetMass(t.GetMass());
74
75 Set(t.GetX(),t.GetAlpha(),t.GetParameter(),t.GetCovariance());
76
77 if ((t.GetStatus()&AliESDtrack::kTIME) == 0) return;
78 StartTimeIntegral();
79 Double_t times[10]; t.GetIntegratedTimes(times); SetIntegratedTimes(times);
80 SetIntegratedLength(t.GetIntegratedLength());
81
82}
83
84//____________________________________________________________________________
85AliTOFtrack& AliTOFtrack::operator=(const AliTOFtrack &source)
86{
87 // ass. op.
88
89 this->fTOFgeometry=source.fTOFgeometry;
90 return *this;
91
92}
93
94//_____________________________________________________________________________
95Bool_t AliTOFtrack::PropagateTo(Double_t xk,Double_t x0,Double_t rho)
96{
97 // Propagates a track of particle with mass=pm to a reference plane
98 // defined by x=xk through media of density=rho and radiationLength=x0
99
100 if (xk == GetX()) return kTRUE;
101
102 Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ();
103
104 Double_t bz=GetBz();
105 if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE;
106
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;
114
115 /*
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;
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
125 */
126
127 return kTRUE;
128}
129
130//_____________________________________________________________________________
131Bool_t AliTOFtrack::PropagateToInnerTOF()
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
137 Double_t ymax=fTOFgeometry->RinTOF()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha());
138 Bool_t skip = kFALSE;
139 Double_t y=GetYat(fTOFgeometry->RinTOF(),skip);
140 if (skip) {
141 return kFALSE;
142 }
143 if (y > ymax) {
144 if (!Rotate(AliTOFGeometry::GetAlpha())) {
145 return kFALSE;
146 }
147 } else if (y <-ymax) {
148 if (!Rotate(-AliTOFGeometry::GetAlpha())) {
149 return kFALSE;
150 }
151 }
152
153
154 Double_t x = GetX();
155 Int_t nsteps=Int_t((370.-x)/0.5); // 0.5 cm Steps
156 for (Int_t istep=0;istep<nsteps;istep++){
157 Float_t xp = x+istep*0.5;
158 Double_t param[2];
159 GetPropagationParameters(param);
160 PropagateTo(xp,param[0],param[1]);
161
162 }
163
164 if(!PropagateTo(fTOFgeometry->RinTOF()))return 0;
165
166 return kTRUE;
167
168}
169
170//_________________________________________________________________________
171Double_t AliTOFtrack::GetYat(Double_t xk, Bool_t & skip) const {
172//-----------------------------------------------------------------
173// This function calculates the Y-coordinate of a track at the plane x=xk.
174// Needed for matching with the TOF (I.Belikov)
175//-----------------------------------------------------------------
176 Double_t y=0.;
177 skip=(!GetYAt(xk,GetBz(),y));
178 return y;
179}
180
181//_____________________________________________________________________________
182Int_t AliTOFtrack::Compare(const TObject *o) const {
183 //-----------------------------------------------------------------
184 // This function compares tracks according to the their curvature
185 //-----------------------------------------------------------------
186 AliTOFtrack *t=(AliTOFtrack*)o;
187 Double_t co=t->GetSigmaY2()*t->GetSigmaZ2();
188 Double_t c =GetSigmaY2()*GetSigmaZ2();
189 if (c>co) return 1;
190 else if (c<co) return -1;
191 return 0;
192}
193
194Double_t AliTOFtrack::GetBz() const {
195 //
196 // returns Bz component of the magnetic field (kG)
197 //
198 if (AliTracker::UniformField()) return AliTracker::GetBz();
199 Double_t r[3]; GetXYZ(r);
200 return AliTracker::GetBz(r);
201}
202
203//_____________________________________________________________________________
204void AliTOFtrack::GetPropagationParameters(Double_t *param) {
205
206 //Get average medium density, x0 while propagating the track
207
208 //For TRD holes description
209 /*
210 Double_t thetamin = (90.-31.1) * TMath::Pi()/180.;
211 Double_t thetamax = (90.+31.1) * TMath::Pi()/180.;
212
213 Double_t zmin = -55.;
214 Double_t zmax = 55.;
215 */
216
217 // Detector inner/outer radii
218 Double_t rTPC = 261.53;
219 Double_t rTPCTRD = 294.5;
220 Double_t rTRD = 369.1;
221
222 // Medium parameters
223 Double_t x0TPC = 40.;
224 Double_t rhoTPC =0.06124;
225
226 Double_t x0Air = 36.66;
227 Double_t rhoAir =1.2931e-3;
228
229 Double_t x0TRD = 171.7;
230 Double_t rhoTRD =0.33;
231
232 // Int_t isec = GetSector();
233 Double_t r[3]; GetXYZ(r);
234 // Float_t thetatr = TMath::ATan2(TMath::Sqrt(r[0]*r[0]+r[1]*r[1]),r[2]);
235
236 /*
237 if(holes){
238 if (isec == 0 || isec == 1 || isec == 2 ) {
239 if( thetatr>=thetamin && thetatr<=thetamax){
240 x0TRD= x0Air;
241 rhoTRD = rhoAir;
242 }
243 }
244 if (isec == 11 || isec == 12 || isec == 13 || isec == 14 || isec == 15 ) {
245 if( r[2]>=zmin && r[2]<=zmax){
246 x0TRD= x0Air;
247 rhoTRD = rhoAir;
248 }
249 }
250 }
251 */
252 if(GetX() <= rTPC)
253 {param[0]=x0TPC;param[1]=rhoTPC;}
254 else if(GetX() > rTPC && GetX() < rTPCTRD)
255 {param[0]=x0Air;param[1]=rhoAir;}
256 else if(GetX() >= rTPCTRD && GetX() < rTRD)
257 {param[0]=x0TRD;param[1]=rhoTRD;}
258 else if(GetX() >= rTRD )
259 {param[0]=x0Air;param[1]=rhoAir;}
260}