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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. * | |
6 | * * | |
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 * | |
10 | * copies and that both the copyright notice and this permission notice * | |
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 | 34 | ClassImp(AliTOFtrack) |
35 | ||
36 | //_____________________________________________________________________________ | |
655e379f | 37 | AliTOFtrack::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 | //_____________________________________________________________________________ |
48 | AliTOFtrack::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 | 59 | AliTOFtrack::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 | 81 | AliTOFtrack& AliTOFtrack::operator=(const AliTOFtrack &/*source*/) |
7aeeaf38 | 82 | { |
83 | // ass. op. | |
84 | ||
7aeeaf38 | 85 | return *this; |
86 | ||
87 | } | |
88 | ||
74ea065c | 89 | //_____________________________________________________________________________ |
6c94f330 | 90 | Bool_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 | 131 | Bool_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 | ||
ac359ffe | 170 | //_________________________________________________________________________ |
171 | Double_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 | //_________________________________________________________________________ | |
182 | Bool_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 | } | |
2c770f53 | 201 | //_________________________________________________________________________ |
4668c628 | 202 | Double_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 | //_____________________________________________________________________________ | |
213 | Int_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 | 227 | void 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 | } |