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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 | **************************************************************************/ | |
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 | ||
35 | ClassImp(AliTOFtrack) | |
36 | ||
37 | //_____________________________________________________________________________ | |
38 | AliTOFtrack::AliTOFtrack() : | |
39 | AliKalmanTrack(), | |
40 | fSeedInd(-1), | |
41 | fSeedLab(-1), | |
42 | fTOFgeometry(0) | |
43 | { | |
44 | // | |
45 | // Default constructor. | |
46 | // | |
47 | } | |
48 | ||
49 | //_____________________________________________________________________________ | |
50 | AliTOFtrack::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 | //_____________________________________________________________________________ | |
62 | AliTOFtrack::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 | //____________________________________________________________________________ | |
85 | AliTOFtrack& AliTOFtrack::operator=(const AliTOFtrack &source) | |
86 | { | |
87 | // ass. op. | |
88 | ||
89 | this->fTOFgeometry=source.fTOFgeometry; | |
90 | return *this; | |
91 | ||
92 | } | |
93 | ||
94 | //_____________________________________________________________________________ | |
95 | Bool_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 | //_____________________________________________________________________________ | |
131 | Bool_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 | //_________________________________________________________________________ | |
171 | Double_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 | //_____________________________________________________________________________ | |
182 | Int_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 | ||
194 | Double_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 | //_____________________________________________________________________________ | |
204 | void 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 | } |