Correct formula for phi, in case of current local X <0, in GetLocalXat and GetPhiZat
[u/mrichter/AliRoot.git] / ITS / AliITStrackSA.cxx
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13918578 1/**************************************************************************
2 * Copyright(c) 1998-2003, 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 **************************************************************************/
bf6adc12 15
16/* $Id$ */
17
13918578 18////////////////////////////////////////////////////
19// Stand alone track class //
20// Origin: Elisabetta Crescio //
21// e-mail: crescio@to.infn.it //
22// it is a V2 track with a possible number //
deae0246 23// of cluster equal to kMaxNumberOfClusters //
13918578 24////////////////////////////////////////////////////
25
cc088660 26#include "AliITSgeomTGeo.h"
13918578 27#include "AliITStrackSA.h"
28
29
30ClassImp(AliITStrackSA)
31
32//_____________________________________
e399f961 33AliITStrackSA:: AliITStrackSA() : AliITStrackMI(),
34fNSA(0)
35{
13918578 36// Default constructor
37 SetNumberOfClusters(0);
38 SetNumberOfClustersSA(0);
39 ResetIndexSA();
e50912db 40 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
7e5bf5af 41 SetNumberOfMarked(nlay,0);
42 }
43 ResetMarked();
13918578 44}
45
46
47//___________________________________________________
15dd636f 48AliITStrackSA::AliITStrackSA(const AliITStrackMI& t) :
e399f961 49AliITStrackMI(t),
50fNSA(0){
13918578 51// Copy a V2 track into a SA track
52 SetNumberOfClustersSA(0);
53 ResetIndexSA();
e50912db 54 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
7e5bf5af 55 SetNumberOfMarked(nlay,0);
56 }
57 ResetMarked();
58
13918578 59}
60//___________________________________________________
61AliITStrackSA::AliITStrackSA(const AliITStrackSA& t) :
e399f961 62AliITStrackMI(t),
63fNSA(t.fNSA){
13918578 64// Copy constructor
65
7d62fb64 66
13918578 67 ResetIndexSA();
7e5bf5af 68 ResetMarked();
13918578 69 Int_t number = t.GetNumberOfClustersSA();
70 SetNumberOfClustersSA(number);
e50912db 71 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
7e5bf5af 72 SetNumberOfMarked(nlay,t.GetNumberOfMarked(nlay));
73 }
13918578 74 for(Int_t i=0;i<number;i++){
75 fSain[i]=t.fSain[i];
76 }
e50912db 77 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
7e5bf5af 78 for(Int_t i=0;i<t.GetNumberOfMarked(nlay);i++){
79 fCluMark[nlay][i]=t.fCluMark[nlay][i];
80 }
81 }
13918578 82}
83//____________________________________________________
cc088660 84AliITStrackSA::AliITStrackSA(Int_t layer, Int_t ladder, Int_t detector, Double_t Ycoor, Double_t Zcoor, Double_t phi, Double_t tanlambda, Double_t curv, Int_t lab ):
e399f961 85fNSA(0)
86{
13918578 87 // standard constructor. Used for ITS standalone tracking
7d62fb64 88
13918578 89 // get the azimuthal angle of the detector containing the innermost
90 // cluster of this track (data member fAlpha)
13918578 91
55d316db 92 TGeoHMatrix m; AliITSgeomTGeo::GetOrigMatrix(layer,ladder,detector,m);
93 const TGeoHMatrix *tm=AliITSgeomTGeo::GetTracking2LocalMatrix(layer,ladder,detector);
94 m.Multiply(tm);
95 Double_t txyz[3]={0.}, xyz[3]={0.};
96 m.LocalToMaster(txyz,xyz);
97 Double_t sAlpha=TMath::ATan2(xyz[1],xyz[0]);
98
99 if (sAlpha<0) sAlpha+=TMath::TwoPi();
100 else if (sAlpha>=TMath::TwoPi()) sAlpha-=TMath::TwoPi();
101
102 Double_t sX=TMath::Sqrt(xyz[0]*xyz[0] + xyz[1]*xyz[1]);
13918578 103
104 fdEdx = 0;
105
6c94f330 106 Double_t conv=GetBz()*kB2C;
107 Double_t sC[] = {0.000009, // 0.000009
108 0.,
109 0.000003, //0.000030
110 0.,
111 0.,
112 0.000001, //0.000001
113 0.,
114 0.,
115 0.,
116 0.000002, //0.000002
117 0.,
118 0.,
119 0.,
120 0.,
121 0.000001/(conv*conv)}; //0.0000001
122
123 Double_t sP[] = {Ycoor,
124 Zcoor,
125 TMath::Sin(phi-sAlpha),
126 tanlambda,
127 curv/conv};
128
1966f03c 129
130 // dealing with the case B=0 (taken from AliTPCtrack.cxx)
0e7590c3 131 Double_t mostProbablePt=AliExternalTrackParam::GetMostProbablePt();
132 Double_t p0=TMath::Sign(1/mostProbablePt,sP[4]);
1966f03c 133 Double_t w0=sC[14]/(sC[14] + p0*p0), w1=p0*p0/(sC[14] + p0*p0);
134 sP[4] = w0*p0 + w1*sP[4];
135 sC[14]*=w1;
136
6c94f330 137 Set(sX,sAlpha,sP,sC);
138
e50912db 139 for(Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fIndex[i] = 0; // to be set explicitely
13918578 140
141 for(Int_t i=0; i<4; i++) fdEdxSample[i] = 0;
142
143 SetNumberOfClusters(0);
144 SetNumberOfClustersSA(0);
e50912db 145 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++) SetNumberOfMarked(nlay,0);
13918578 146 ResetIndexSA();
7e5bf5af 147 ResetMarked();
13918578 148 SetChi2(0);
149 SetMass(0.139); // pion mass
150 SetLabel(lab);
151
152}
153
154//____________________________________________________________
155void AliITStrackSA::AddClusterSA(Int_t layer, Int_t clnumb) {
deae0246 156 // add one clusters to the list (maximum number=kMaxNumberOfClusters)
13918578 157 Int_t presnum = GetNumberOfClustersSA();
deae0246 158 if(presnum>=kMaxNumberOfClusters){
13918578 159 Warning("AddClusterSA","Maximum number of clusters already reached. Nothing is done\n");
160 return;
161 }
162
163 fSain[presnum] = (layer<<28)+clnumb;
164 presnum++;
165 SetNumberOfClustersSA(presnum);
166}
167
168//____________________________________________________________
7e5bf5af 169void AliITStrackSA::AddClusterMark(Int_t layer, Int_t clnumb) {
deae0246 170 // add one clusters to the list (maximum number=kMaxNumberOfClusters)
7e5bf5af 171 Int_t presnum = GetNumberOfMarked(layer);
172 // printf("presnum=%d\n",presnum);
deae0246 173 if(presnum>=kMaxNumberOfClustersL){
7e5bf5af 174 Warning("AddClusterMark","Maximum number of clusters already reached. Nothing is done\n");
175 return;
176 }
177
178 fCluMark[layer][presnum] = clnumb;
179 presnum++;
180 SetNumberOfMarked(layer,presnum);
181}
182
183//____________________________________________________________
13918578 184void AliITStrackSA::AddClusterV2(Int_t layer,Int_t clnumb) {
185 // add one clusters to the list (maximum number=6)
186 Int_t presnum = GetNumberOfClusters();
e50912db 187 if(presnum>=AliITSgeomTGeo::GetNLayers()){
13918578 188 Warning("AddClusterV2","Maximum number of clusters already reached. Nothing is done\n");
189 return;
190 }
191
192 fIndex[presnum] = (layer<<28)+clnumb;
193 presnum++;
194 SetNumberOfClusters(presnum);
195}
196
7e5bf5af 197//_____________________________________________________________
198void AliITStrackSA::ResetMarked(){
13918578 199
7e5bf5af 200 //Reset array of marked clusters
e50912db 201 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
deae0246 202 for(Int_t k=0; k<kMaxNumberOfClustersL; k++) fCluMark[nlay][k]=0;
7e5bf5af 203 }
204}
13918578 205