1 /**************************************************************************
2 * Copyright(c) 1998-2003, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
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 //
23 // of cluster equal to kMaxNumberOfClusters //
24 ////////////////////////////////////////////////////
26 #include "AliITSgeomTGeo.h"
27 #include "AliITStrackSA.h"
30 ClassImp(AliITStrackSA)
32 //_____________________________________
33 AliITStrackSA:: AliITStrackSA() : AliITStrackMI(),
36 // Default constructor
37 SetNumberOfClusters(0);
38 SetNumberOfClustersSA(0);
40 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
41 SetNumberOfMarked(nlay,0);
47 //___________________________________________________
48 AliITStrackSA::AliITStrackSA(const AliITStrackMI& t) :
51 // Copy a V2 track into a SA track
52 SetNumberOfClustersSA(0);
54 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
55 SetNumberOfMarked(nlay,0);
60 //___________________________________________________
61 AliITStrackSA::AliITStrackSA(const AliITStrackSA& t) :
69 Int_t number = t.GetNumberOfClustersSA();
70 SetNumberOfClustersSA(number);
71 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
72 SetNumberOfMarked(nlay,t.GetNumberOfMarked(nlay));
74 for(Int_t i=0;i<number;i++){
77 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
78 for(Int_t i=0;i<t.GetNumberOfMarked(nlay);i++){
79 fCluMark[nlay][i]=t.fCluMark[nlay][i];
83 //____________________________________________________
84 AliITStrackSA::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 ):
87 // standard constructor. Used for ITS standalone tracking
89 // get the azimuthal angle of the detector containing the innermost
90 // cluster of this track (data member fAlpha)
92 TGeoHMatrix m; AliITSgeomTGeo::GetOrigMatrix(layer,ladder,detector,m);
93 const TGeoHMatrix *tm=AliITSgeomTGeo::GetTracking2LocalMatrix(layer,ladder,detector);
95 Double_t txyz[3]={0.}, xyz[3]={0.};
96 m.LocalToMaster(txyz,xyz);
97 Double_t sAlpha=TMath::ATan2(xyz[1],xyz[0]);
99 if (sAlpha<0) sAlpha+=TMath::TwoPi();
100 else if (sAlpha>=TMath::TwoPi()) sAlpha-=TMath::TwoPi();
102 Double_t sX=TMath::Sqrt(xyz[0]*xyz[0] + xyz[1]*xyz[1]);
104 Init(sAlpha,sX,Ycoor,Zcoor,phi,tanlambda,curv,lab);
107 //____________________________________________________
108 AliITStrackSA::AliITStrackSA(Double_t alpha, Double_t radius, Double_t Ycoor, Double_t Zcoor, Double_t phi, Double_t tanlambda, Double_t curv, Int_t lab ):
111 // standard constructor. Used for ITS standalone tracking
113 // get the azimuthal angle of the detector containing the innermost
114 // cluster of this track (data member fAlpha)
116 if (alpha<0) alpha+=TMath::TwoPi();
117 else if (alpha>=TMath::TwoPi()) alpha-=TMath::TwoPi();
118 Init(alpha,radius,Ycoor,Zcoor,phi,tanlambda,curv,lab);
120 //____________________________________________________
121 void AliITStrackSA::Init(Double_t alpha, Double_t radius, Double_t Ycoor, Double_t Zcoor, Double_t phi, Double_t tanlambda, Double_t curv, Int_t lab ){
122 // initialize parameters
126 Double_t conv=GetBz()*kB2C;
127 Double_t sC[] = {0.000009, // 0.000009
141 0.000001/(conv*conv)}; //0.0000001
143 Double_t sP[] = {Ycoor,
145 TMath::Sin(phi-alpha),
150 // dealing with the case B=0 (taken from AliTPCtrack.cxx)
151 Double_t mostProbablePt=AliExternalTrackParam::GetMostProbablePt();
152 Double_t p0=TMath::Sign(1/mostProbablePt,sP[4]);
153 Double_t w0=sC[14]/(sC[14] + p0*p0), w1=p0*p0/(sC[14] + p0*p0);
154 sP[4] = w0*p0 + w1*sP[4];
157 Set(radius,alpha,sP,sC);
159 for(Int_t i=0; i<AliITSgeomTGeo::GetNLayers(); i++) fIndex[i] = 0; // to be set explicitely
161 for(Int_t i=0; i<4; i++) fdEdxSample[i] = 0;
163 SetNumberOfClusters(0);
164 SetNumberOfClustersSA(0);
165 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++) SetNumberOfMarked(nlay,0);
169 SetMass(0.139); // pion mass
174 //____________________________________________________________
175 void AliITStrackSA::AddClusterSA(Int_t layer, Int_t clnumb) {
176 // add one clusters to the list (maximum number=kMaxNumberOfClusters)
177 Int_t presnum = GetNumberOfClustersSA();
178 if(presnum>=kMaxNumberOfClusters){
179 Warning("AddClusterSA","Maximum number of clusters already reached. Nothing is done\n");
183 fSain[presnum] = (layer<<28)+clnumb;
185 SetNumberOfClustersSA(presnum);
188 //____________________________________________________________
189 void AliITStrackSA::AddClusterMark(Int_t layer, Int_t clnumb) {
190 // add one clusters to the list (maximum number=kMaxNumberOfClusters)
191 Int_t presnum = GetNumberOfMarked(layer);
192 // printf("presnum=%d\n",presnum);
193 if(presnum>=kMaxNumberOfClustersL){
194 Warning("AddClusterMark","Maximum number of clusters already reached. Nothing is done\n");
198 fCluMark[layer][presnum] = clnumb;
200 SetNumberOfMarked(layer,presnum);
203 //____________________________________________________________
204 void AliITStrackSA::AddClusterV2(Int_t layer,Int_t clnumb) {
205 // add one clusters to the list (maximum number=6)
206 Int_t presnum = GetNumberOfClusters();
207 if(presnum>=AliITSgeomTGeo::GetNLayers()){
208 Warning("AddClusterV2","Maximum number of clusters already reached. Nothing is done\n");
212 fIndex[presnum] = (layer<<28)+clnumb;
214 SetNumberOfClusters(presnum);
217 //_____________________________________________________________
218 void AliITStrackSA::ResetMarked(){
220 //Reset array of marked clusters
221 for(Int_t nlay=0;nlay<AliITSgeomTGeo::GetNLayers();nlay++){
222 for(Int_t k=0; k<kMaxNumberOfClustersL; k++) fCluMark[nlay][k]=0;