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87594435 | 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 | ||
acd84897 | 16 | /* $Id$ */ |
fb17acd4 | 17 | |
87594435 | 18 | //------------------------------------------------------------------------- |
19 | // Implementation of the AliKalmanTrack class | |
066782e8 | 20 | // that is the base for AliTPCtrack, AliITStrackV2 and AliTRDtrack |
87594435 | 21 | // Origin: Iouri Belikov, CERN, Jouri.Belikov@cern.ch |
22 | //------------------------------------------------------------------------- | |
6c94f330 | 23 | #include <TGeoManager.h> |
39d4ae58 | 24 | |
87594435 | 25 | #include "AliKalmanTrack.h" |
87594435 | 26 | |
27 | ClassImp(AliKalmanTrack) | |
28 | ||
e2afb3b6 | 29 | //_______________________________________________________________________ |
6c94f330 | 30 | AliKalmanTrack::AliKalmanTrack():AliExternalTrackParam(), |
68b8060b | 31 | fFakeRatio(0), |
e2afb3b6 | 32 | fChi2(0), |
304864ab | 33 | fMass(AliPID::ParticleMass(AliPID::kPion)), |
562dd0b4 | 34 | fLab(-3141593), |
c6e740ea | 35 | fN(0), |
90e48c0c | 36 | fStartTimeIntegral(kFALSE), |
37 | fIntegratedLength(0) | |
e2afb3b6 | 38 | { |
116cbefd | 39 | // |
40 | // Default constructor | |
41 | // | |
c84a5e9e | 42 | |
115179c6 | 43 | for(Int_t i=0; i<AliPID::kSPECIESC; i++) fIntegratedTime[i] = 0; |
e2afb3b6 | 44 | } |
45 | ||
e2afb3b6 | 46 | AliKalmanTrack::AliKalmanTrack(const AliKalmanTrack &t): |
6c94f330 | 47 | AliExternalTrackParam(t), |
babd135a | 48 | fFakeRatio(t.fFakeRatio), |
e2afb3b6 | 49 | fChi2(t.fChi2), |
50 | fMass(t.fMass), | |
562dd0b4 | 51 | fLab(t.fLab), |
c6e740ea | 52 | fN(t.fN), |
90e48c0c | 53 | fStartTimeIntegral(t.fStartTimeIntegral), |
54 | fIntegratedLength(t.fIntegratedLength) | |
e2afb3b6 | 55 | { |
116cbefd | 56 | // |
57 | // Copy constructor | |
58 | // | |
74f9526e | 59 | |
115179c6 | 60 | for (Int_t i=0; i<AliPID::kSPECIESC; i++) |
c84a5e9e | 61 | fIntegratedTime[i] = t.fIntegratedTime[i]; |
74f9526e | 62 | } |
c5507f6d | 63 | |
316c6cd9 | 64 | AliKalmanTrack& AliKalmanTrack::operator=(const AliKalmanTrack&o){ |
65 | if(this!=&o){ | |
66 | AliExternalTrackParam::operator=(o); | |
67 | fLab = o.fLab; | |
68 | fFakeRatio = o.fFakeRatio; | |
69 | fChi2 = o.fChi2; | |
70 | fMass = o.fMass; | |
71 | fN = o.fN; | |
72 | fStartTimeIntegral = o.fStartTimeIntegral; | |
115179c6 | 73 | for(Int_t i = 0;i<AliPID::kSPECIESC;++i)fIntegratedTime[i] = o.fIntegratedTime[i]; |
316c6cd9 | 74 | fIntegratedLength = o.fIntegratedLength; |
75 | } | |
76 | return *this; | |
77 | } | |
78 | ||
74f9526e | 79 | //_______________________________________________________________________ |
80 | void AliKalmanTrack::StartTimeIntegral() | |
81 | { | |
49a7a79a | 82 | // Sylwester Radomski, GSI |
83 | // S.Radomski@gsi.de | |
74f9526e | 84 | // |
85 | // Start time integration | |
86 | // To be called at Vertex by ITS tracker | |
87 | // | |
88 | ||
89 | //if (fStartTimeIntegral) | |
f37d970d | 90 | // AliWarning("Reseting Recorded Time."); |
74f9526e | 91 | |
92 | fStartTimeIntegral = kTRUE; | |
115179c6 | 93 | for(Int_t i=0; i<AliPID::kSPECIESC; i++) fIntegratedTime[i] = 0; |
74f9526e | 94 | fIntegratedLength = 0; |
95 | } | |
7d0f8548 | 96 | |
74f9526e | 97 | //_______________________________________________________________________ |
98 | void AliKalmanTrack:: AddTimeStep(Double_t length) | |
99 | { | |
100 | // | |
101 | // Add step to integrated time | |
102 | // this method should be called by a sublasses at the end | |
103 | // of the PropagateTo function or by a tracker | |
104 | // each time step is made. | |
105 | // | |
106 | // If integration not started function does nothing | |
107 | // | |
108 | // Formula | |
109 | // dt = dl * sqrt(p^2 + m^2) / p | |
110 | // p = pT * (1 + tg^2 (lambda) ) | |
111 | // | |
112 | // pt = 1/external parameter [4] | |
113 | // tg lambda = external parameter [3] | |
114 | // | |
115 | // | |
116 | // Sylwester Radomski, GSI | |
117 | // S.Radomski@gsi.de | |
118 | // | |
119 | ||
5d8718b8 | 120 | static const Double_t kcc = 2.99792458e-2; |
74f9526e | 121 | |
122 | if (!fStartTimeIntegral) return; | |
123 | ||
124 | fIntegratedLength += length; | |
125 | ||
74f9526e | 126 | Double_t xr, param[5]; |
74f9526e | 127 | |
128 | GetExternalParameters(xr, param); | |
1d26da6d | 129 | double tgl = param[3]; |
74f9526e | 130 | |
1d26da6d | 131 | Double_t p2inv = param[4]*param[4]/(1+tgl*tgl); |
74f9526e | 132 | |
2bf46337 | 133 | // if (length > 100) return; |
74f9526e | 134 | |
115179c6 | 135 | for (Int_t i=0; i<AliPID::kSPECIESC; i++) { |
74f9526e | 136 | |
1d26da6d | 137 | Double_t massz = AliPID::ParticleMassZ(i); |
138 | Double_t correction = TMath::Sqrt( 1. + massz*massz*p2inv ); // 1/beta | |
5d8718b8 | 139 | Double_t time = length * correction / kcc; |
74f9526e | 140 | |
74f9526e | 141 | fIntegratedTime[i] += time; |
142 | } | |
e2afb3b6 | 143 | } |
144 | ||
74f9526e | 145 | //_______________________________________________________________________ |
74f9526e | 146 | Double_t AliKalmanTrack::GetIntegratedTime(Int_t pdg) const |
147 | { | |
49a7a79a | 148 | // Sylwester Radomski, GSI |
149 | // S.Radomski@gsi.de | |
74f9526e | 150 | // |
151 | // Return integrated time hypothesis for a given particle | |
152 | // type assumption. | |
153 | // | |
154 | // Input parameter: | |
155 | // pdg - Pdg code of a particle type | |
156 | // | |
157 | ||
158 | ||
159 | if (!fStartTimeIntegral) { | |
f37d970d | 160 | AliWarning("Time integration not started"); |
74f9526e | 161 | return 0.; |
162 | } | |
163 | ||
115179c6 | 164 | for (Int_t i=0; i<AliPID::kSPECIESC; i++) |
304864ab | 165 | if (AliPID::ParticleCode(i) == TMath::Abs(pdg)) return fIntegratedTime[i]; |
74f9526e | 166 | |
f37d970d | 167 | AliWarning(Form("Particle type [%d] not found", pdg)); |
74f9526e | 168 | return 0; |
169 | } | |
ae982df3 | 170 | |
fc9b31a7 | 171 | void AliKalmanTrack::GetIntegratedTimes(Double_t *times, Int_t nspec) const { |
172 | for (Int_t i=nspec; i--;) times[i]=fIntegratedTime[i]; | |
ae982df3 | 173 | } |
174 | ||
175 | void AliKalmanTrack::SetIntegratedTimes(const Double_t *times) { | |
fc9b31a7 | 176 | for (Int_t i=AliPID::kSPECIESC; i--;) fIntegratedTime[i]=times[i]; |
ae982df3 | 177 | } |
178 |