added protection against floating point exception (Alexander)
[u/mrichter/AliRoot.git] / TOF / AliTOFtrack.cxx
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74ea065c 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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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 *
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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 **************************************************************************/
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//_____________________________________________________________________________
35b6d6a6 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
35b6d6a6 99 Double_t oldX=GetX();//, oldY=GetY(), oldZ=GetZ();
100 Double_t start[3], end[3], mparam[7];
74ea065c 101
5a388465 102 /* get start position */
103 GetXYZ(start);
104
105 /* propagate the track */
c4eac485 106 Double_t b[3];GetBxByBz(b);
107 if (!AliExternalTrackParam::PropagateToBxByBz(xk,b)) return kFALSE;
108 // OLD used code
109 //Double_t bz=GetBz();
110 //if (!AliExternalTrackParam::PropagateTo(xk,bz)) return kFALSE;
74ea065c 111
5a388465 112 /* get end position */
113 GetXYZ(end);
114
115 /* add time step to integral */
116#if 0 /*** OLD ***/
6c94f330 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);
5a388465 121#endif
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);
126
127 /* get material budget from tracker */
128 AliTracker::MeanMaterialBudget(start, end, mparam);
129 Double_t xTimesRho = mparam[4]*mparam[0];
130 Double_t xOverX0 = mparam[1];
6c94f330 131
1962b348 132 if (oldX < xk) {
133 xTimesRho = -xTimesRho; // should be negative in case of outward propagation (--> energy decreases)
134 }
135
5a388465 136 /* correct for mean material */
137 if (!AliExternalTrackParam::CorrectForMeanMaterial(xOverX0,xTimesRho,GetMass())) return kFALSE;
138
139
140#if 0 /*** OLD ***/
6c94f330 141 if (!AliExternalTrackParam::CorrectForMaterial(d*rho/x0,x0,GetMass()))
142 return kFALSE;
5a388465 143#endif
74ea065c 144
74ea065c 145 /*
74ea065c 146 //Energy losses************************
147 if((5940*beta2/(1-beta2+1e-10) - beta2) < 0){return 0;}
148
149 Double_t dE=0.153e-3/beta2*(log(5940*beta2/(1-beta2+1e-10)) - beta2)*d*rho;
983ebc4f 150 //
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
6c94f330 155 */
74ea065c 156
6c94f330 157 return kTRUE;
74ea065c 158}
159
160//_____________________________________________________________________________
ba4161e8 161Bool_t AliTOFtrack::PropagateToInnerTOF()
74ea065c 162{
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
165
166
ba66add8 167 Double_t ymax=AliTOFGeometry::RinTOF()*TMath::Tan(0.5*AliTOFGeometry::GetAlpha());
74ea065c 168 Bool_t skip = kFALSE;
ba66add8 169 Double_t y=GetYat(AliTOFGeometry::RinTOF(),skip);
6c94f330 170 if (skip) {
171 return kFALSE;
74ea065c 172 }
173 if (y > ymax) {
2c770f53 174 if (!Rotate(AliTOFGeometry::GetAlpha())) {
6c94f330 175 return kFALSE;
74ea065c 176 }
177 } else if (y <-ymax) {
2c770f53 178 if (!Rotate(-AliTOFGeometry::GetAlpha())) {
6c94f330 179 return kFALSE;
74ea065c 180 }
181 }
182
2c770f53 183 Double_t x = GetX();
b3e52baa 184 Int_t nsteps=Int_t((AliTOFGeometry::Rmin()-x)/0.5); // 0.5 cm Steps
74ea065c 185 for (Int_t istep=0;istep<nsteps;istep++){
186 Float_t xp = x+istep*0.5;
5a388465 187 // GetPropagationParameters(param);
188 PropagateTo(xp,0.,0.); /* passing 0.,0. as arguments since now
189 this method queries TGeo for material budget
190 */
74ea065c 191
192 }
193
ba66add8 194 if(!PropagateTo(AliTOFGeometry::RinTOF()))return 0;
74ea065c 195
6c94f330 196 return kTRUE;
74ea065c 197
198}
199
2c770f53 200//_________________________________________________________________________
ac359ffe 201Double_t AliTOFtrack::GetPredictedChi2(const AliCluster3D *c) const {
202 //
18f005ac 203 // Estimate the chi2 of the space point "c" with its cov. matrix elements
ac359ffe 204 //
18f005ac 205
ac359ffe 206 Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
207 Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
208 Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
209 return AliExternalTrackParam::GetPredictedChi2(p, covyz, covxyz);
210}
211//_________________________________________________________________________
212Bool_t AliTOFtrack::PropagateTo(const AliCluster3D *c) {
213 //
18f005ac 214 // Propagates a track to the plane containing cluster 'c'
ac359ffe 215 //
216 Double_t oldX=GetX(), oldY=GetY(), oldZ=GetZ();
217 Double_t p[3]={c->GetX(), c->GetY(), c->GetZ()};
218 Double_t covyz[3]={c->GetSigmaY2(), c->GetSigmaYZ(), c->GetSigmaZ2()};
219 Double_t covxyz[3]={c->GetSigmaX2(), c->GetSigmaXY(), c->GetSigmaXZ()};
220 Double_t bz=GetBz();
221 if (!AliExternalTrackParam::PropagateTo(p, covyz, covxyz, bz)) return kFALSE;
222 if (IsStartedTimeIntegral()) {
223 Double_t d = TMath::Sqrt((GetX()-oldX)*(GetX()-oldX) +
224 (GetY()-oldY)*(GetY()-oldY) +
225 (GetZ()-oldZ)*(GetZ()-oldZ));
226 if (GetX()<oldX) d=-d;
227 AddTimeStep(d);
228 }
229 return kTRUE;
230}
231//_________________________________________________________________________
4668c628 232Double_t AliTOFtrack::GetYat(Double_t xk, Bool_t & skip) const {
2c770f53 233//-----------------------------------------------------------------
234// This function calculates the Y-coordinate of a track at the plane x=xk.
235// Needed for matching with the TOF (I.Belikov)
236//-----------------------------------------------------------------
6c94f330 237 Double_t y=0.;
238 skip=(!GetYAt(xk,GetBz(),y));
239 return y;
2c770f53 240}
74ea065c 241
242//_____________________________________________________________________________
243Int_t AliTOFtrack::Compare(const TObject *o) const {
244 //-----------------------------------------------------------------
245 // This function compares tracks according to the their curvature
246 //-----------------------------------------------------------------
247 AliTOFtrack *t=(AliTOFtrack*)o;
248 Double_t co=t->GetSigmaY2()*t->GetSigmaZ2();
249 Double_t c =GetSigmaY2()*GetSigmaZ2();
250 if (c>co) return 1;
251 else if (c<co) return -1;
252 return 0;
253}
254
6c94f330 255
74ea065c 256//_____________________________________________________________________________
ba4161e8 257void AliTOFtrack::GetPropagationParameters(Double_t *param) {
74ea065c 258
2c770f53 259 //Get average medium density, x0 while propagating the track
260
261 //For TRD holes description
ba4161e8 262 /*
74ea065c 263 Double_t thetamin = (90.-31.1) * TMath::Pi()/180.;
264 Double_t thetamax = (90.+31.1) * TMath::Pi()/180.;
265
266 Double_t zmin = -55.;
267 Double_t zmax = 55.;
ba4161e8 268 */
74ea065c 269
2c770f53 270 // Detector inner/outer radii
74ea065c 271 Double_t rTPC = 261.53;
272 Double_t rTPCTRD = 294.5;
273 Double_t rTRD = 369.1;
274
2c770f53 275 // Medium parameters
74ea065c 276 Double_t x0TPC = 40.;
277 Double_t rhoTPC =0.06124;
278
279 Double_t x0Air = 36.66;
280 Double_t rhoAir =1.2931e-3;
281
282 Double_t x0TRD = 171.7;
283 Double_t rhoTRD =0.33;
284
ba4161e8 285 // Int_t isec = GetSector();
6c94f330 286 Double_t r[3]; GetXYZ(r);
ba4161e8 287 // Float_t thetatr = TMath::ATan2(TMath::Sqrt(r[0]*r[0]+r[1]*r[1]),r[2]);
74ea065c 288
ba4161e8 289 /*
74ea065c 290 if(holes){
291 if (isec == 0 || isec == 1 || isec == 2 ) {
292 if( thetatr>=thetamin && thetatr<=thetamax){
293 x0TRD= x0Air;
294 rhoTRD = rhoAir;
295 }
296 }
297 if (isec == 11 || isec == 12 || isec == 13 || isec == 14 || isec == 15 ) {
6c94f330 298 if( r[2]>=zmin && r[2]<=zmax){
74ea065c 299 x0TRD= x0Air;
300 rhoTRD = rhoAir;
301 }
302 }
303 }
ba4161e8 304 */
2c770f53 305 if(GetX() <= rTPC)
74ea065c 306 {param[0]=x0TPC;param[1]=rhoTPC;}
2c770f53 307 else if(GetX() > rTPC && GetX() < rTPCTRD)
74ea065c 308 {param[0]=x0Air;param[1]=rhoAir;}
2c770f53 309 else if(GetX() >= rTPCTRD && GetX() < rTRD)
74ea065c 310 {param[0]=x0TRD;param[1]=rhoTRD;}
2c770f53 311 else if(GetX() >= rTRD )
74ea065c 312 {param[0]=x0Air;param[1]=rhoAir;}
74ea065c 313}