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a3a3a28f | 1 | #include <TFile.h> |
37add1d1 | 2 | #include <TH1.h> |
3 | #include <TH2.h> | |
a3a3a28f | 4 | #include "AliGeomManager.h" |
a3a3a28f | 5 | #include "AliITSDetTypeRec.h" |
6 | #include "AliITSInitGeometry.h" | |
7 | #include "AliITSMeanVertexer.h" | |
8 | #include "AliITSLoader.h" | |
9 | #include "AliLog.h" | |
10 | #include "AliRawReader.h" | |
11 | #include "AliRawReaderDate.h" | |
12 | #include "AliRawReaderRoot.h" | |
13 | #include "AliRunLoader.h" | |
14 | #include "AliITSVertexer3D.h" | |
37add1d1 | 15 | #include "AliITSVertexer3DTapan.h" |
a3a3a28f | 16 | #include "AliESDVertex.h" |
17 | #include "AliMeanVertex.h" | |
18 | #include "AliMultiplicity.h" | |
19 | ||
a3a3a28f | 20 | ClassImp(AliITSMeanVertexer) |
21 | ||
22 | /////////////////////////////////////////////////////////////////////// | |
23 | // // | |
24 | // Class to compute vertex position using SPD local reconstruction // | |
25 | // An average vertex position using all the events // | |
26 | // is built and saved // | |
27 | // Individual vertices can be optionally stored // | |
28 | // Origin: M.Masera (masera@to.infn.it) // | |
29 | // Usage: | |
30 | // AliITSMeanVertexer mv("RawDataFileName"); | |
31 | // mv.SetGeometryFileName("FileWithGeometry.root"); // def. geometry.root | |
32 | // .... optional setters .... | |
33 | // mv.Reconstruct(); // SPD local reconstruction | |
34 | // mv.DoVertices(); | |
35 | // Resulting AliMeanVertex object is stored in a file named fMVFileName | |
36 | /////////////////////////////////////////////////////////////////////// | |
37 | ||
38 | /* $Id$ */ | |
39 | ||
40 | //______________________________________________________________________ | |
41 | AliITSMeanVertexer::AliITSMeanVertexer():TObject(), | |
37add1d1 | 42 | fDetTypeRec(NULL), |
43 | fVertexXY(NULL), | |
44 | fVertexZ(NULL), | |
a3a3a28f | 45 | fNoEventsContr(0), |
46 | fTotTracklets(0.), | |
47 | fAverTracklets(0.), | |
762133f4 | 48 | fTotTrackletsSq(0.), |
a3a3a28f | 49 | fSigmaOnAverTracks(0.), |
50 | fFilterOnContributors(0), | |
37add1d1 | 51 | fFilterOnTracklets(0) |
a3a3a28f | 52 | { |
53 | // Default Constructor | |
54 | for(Int_t i=0;i<3;i++){ | |
762133f4 | 55 | fWeighPosSum[i] = 0.; |
56 | fWeighSigSum[i] = 0.; | |
57 | fAverPosSum[i] = 0.; | |
a3a3a28f | 58 | fWeighPos[i] = 0.; |
59 | fWeighSig[i] = 0.; | |
60 | fAverPos[i] = 0.; | |
61 | for(Int_t j=0; j<3;j++)fAverPosSq[i][j] = 0.; | |
762133f4 | 62 | for(Int_t j=0; j<3;j++)fAverPosSqSum[i][j] = 0.; |
a3a3a28f | 63 | } |
a3a3a28f | 64 | |
37add1d1 | 65 | // Histograms initialization |
8d7f6205 | 66 | const Float_t xLimit = 5.0, yLimit = 5.0, zLimit = 50.0; |
37add1d1 | 67 | const Float_t xDelta = 0.02, yDelta = 0.02, zDelta = 0.2; |
68 | fVertexXY = new TH2F("VertexXY","Vertex Diamond (Y vs X)", | |
69 | 2*(Int_t)(xLimit/xDelta),-xLimit,xLimit, | |
70 | 2*(Int_t)(yLimit/yDelta),-yLimit,yLimit); | |
71 | fVertexZ = new TH1F("VertexZ"," Longitudinal Vertex Profile", | |
72 | 2*(Int_t)(zLimit/zDelta),-zLimit,zLimit); | |
a3a3a28f | 73 | } |
74 | ||
75 | //______________________________________________________________________ | |
37add1d1 | 76 | Bool_t AliITSMeanVertexer::Init() { |
77 | // Initialize filters | |
a3a3a28f | 78 | // Initialize geometry |
37add1d1 | 79 | // Initialize ITS classes |
a3a3a28f | 80 | |
37add1d1 | 81 | AliGeomManager::LoadGeometry(); |
82 | if (!AliGeomManager::ApplyAlignObjsFromCDB("ITS")) return kFALSE; | |
a3a3a28f | 83 | |
84 | AliITSInitGeometry initgeom; | |
85 | AliITSgeom *geom = initgeom.CreateAliITSgeom(); | |
37add1d1 | 86 | if (!geom) return kFALSE; |
a3a3a28f | 87 | printf("Geometry name: %s \n",(initgeom.GetGeometryName()).Data()); |
37add1d1 | 88 | |
cf0b1cea | 89 | fDetTypeRec = new AliITSDetTypeRec(); |
762133f4 | 90 | fDetTypeRec->SetLoadOnlySPDCalib(kTRUE); |
37add1d1 | 91 | fDetTypeRec->SetITSgeom(geom); |
92 | fDetTypeRec->SetDefaults(); | |
93 | fDetTypeRec->SetDefaultClusterFindersV2(kTRUE); | |
94 | ||
a3a3a28f | 95 | // Initialize filter values to their defaults |
96 | SetFilterOnContributors(); | |
97 | SetFilterOnTracklets(); | |
a3a3a28f | 98 | |
37add1d1 | 99 | return kTRUE; |
a3a3a28f | 100 | } |
101 | ||
102 | //______________________________________________________________________ | |
103 | AliITSMeanVertexer::~AliITSMeanVertexer() { | |
104 | // Destructor | |
37add1d1 | 105 | delete fDetTypeRec; |
106 | delete fVertexXY; | |
107 | delete fVertexZ; | |
a3a3a28f | 108 | } |
109 | ||
110 | //______________________________________________________________________ | |
37add1d1 | 111 | Bool_t AliITSMeanVertexer::Reconstruct(AliRawReader *rawReader, Bool_t mode){ |
a3a3a28f | 112 | // Performs SPD local reconstruction |
37add1d1 | 113 | // and vertex finding |
114 | // returns true in case a vertex is found | |
115 | ||
116 | // Run SPD cluster finder | |
117 | TTree* clustersTree = new TTree("TreeR", "Reconstructed Points Container"); //make a tree | |
118 | fDetTypeRec->DigitsToRecPoints(rawReader,clustersTree,"SPD"); | |
119 | ||
120 | Bool_t vtxOK = kFALSE; | |
121 | AliESDVertex *vtx = NULL; | |
122 | // Run Tapan's vertex-finder | |
123 | if (!mode) { | |
124 | AliITSVertexer3DTapan *vertexer1 = new AliITSVertexer3DTapan(1000); | |
125 | vtx = vertexer1->FindVertexForCurrentEvent(clustersTree); | |
126 | delete vertexer1; | |
127 | if (TMath::Abs(vtx->GetChi2()) < 0.1) vtxOK = kTRUE; | |
a3a3a28f | 128 | } |
37add1d1 | 129 | else { |
130 | // Run standard vertexer3d | |
131 | AliITSVertexer3D *vertexer2 = new AliITSVertexer3D(); | |
cf0b1cea | 132 | vtx = vertexer2->FindVertexForCurrentEvent(clustersTree); |
37add1d1 | 133 | AliMultiplicity *mult = vertexer2->GetMultiplicity(); |
134 | delete vertexer2; | |
135 | if(Filter(vtx,mult)) vtxOK = kTRUE; | |
a3a3a28f | 136 | } |
37add1d1 | 137 | delete clustersTree; |
138 | if (vtxOK) AddToMean(vtx); | |
139 | if (vtx) delete vtx; | |
a3a3a28f | 140 | |
37add1d1 | 141 | return vtxOK; |
a3a3a28f | 142 | } |
143 | ||
144 | //______________________________________________________________________ | |
37add1d1 | 145 | void AliITSMeanVertexer::WriteVertices(const char *filename){ |
146 | // Compute mean vertex and | |
147 | // store it along with the histograms | |
148 | // in a file | |
149 | ||
150 | TFile fmv(filename,"update"); | |
151 | ||
a3a3a28f | 152 | if(ComputeMean()){ |
153 | Double_t cov[6]; | |
154 | cov[0] = fAverPosSq[0][0]; // variance x | |
155 | cov[1] = fAverPosSq[0][1]; // cov xy | |
156 | cov[2] = fAverPosSq[1][1]; // variance y | |
157 | cov[3] = fAverPosSq[0][2]; // cov xz | |
158 | cov[4] = fAverPosSq[1][2]; // cov yz | |
159 | cov[5] = fAverPosSq[2][2]; // variance z | |
37add1d1 | 160 | AliMeanVertex mv(fWeighPos,fWeighSig,cov,fNoEventsContr,fTotTracklets,fAverTracklets,fSigmaOnAverTracks); |
a3a3a28f | 161 | mv.SetTitle("Mean Vertex"); |
37add1d1 | 162 | mv.SetName("MeanVertex"); |
a3a3a28f | 163 | AliDebug(1,Form("Contrib av. trk = %10.2f ",mv.GetAverageNumbOfTracklets())); |
164 | AliDebug(1,Form("Sigma %10.4f ",mv.GetSigmaOnAvNumbOfTracks())); | |
37add1d1 | 165 | // we have to add chi2 here |
762133f4 | 166 | AliESDVertex vtx(fWeighPos,cov,0,TMath::Nint(fAverTracklets),"MeanVertexPos"); |
37add1d1 | 167 | |
168 | mv.Write(mv.GetName(),TObject::kOverwrite); | |
169 | vtx.Write(vtx.GetName(),TObject::kOverwrite); | |
a3a3a28f | 170 | } |
171 | else { | |
172 | AliError(Form("Evaluation of mean vertex not possible. Number of used events = %d",fNoEventsContr)); | |
173 | } | |
37add1d1 | 174 | |
175 | fVertexXY->Write(fVertexXY->GetName(),TObject::kOverwrite); | |
176 | fVertexZ->Write(fVertexZ->GetName(),TObject::kOverwrite); | |
177 | fmv.Close(); | |
a3a3a28f | 178 | } |
179 | ||
180 | //______________________________________________________________________ | |
181 | Bool_t AliITSMeanVertexer::Filter(AliESDVertex *vert,AliMultiplicity *mult){ | |
182 | // Apply selection criteria to events | |
183 | Bool_t status = kFALSE; | |
184 | if(!vert || !mult)return status; | |
8d7f6205 | 185 | // Remove vertices reconstructed with vertexerZ |
186 | if(strcmp(vert->GetName(),"SPDVertexZ") == 0) return status; | |
a3a3a28f | 187 | Int_t ncontr = vert->GetNContributors(); |
188 | Int_t ntracklets = mult->GetNumberOfTracklets(); | |
189 | AliDebug(1,Form("Number of contributors = %d",ncontr)); | |
190 | AliDebug(1,Form("Number of tracklets = %d",ntracklets)); | |
191 | if(ncontr>fFilterOnContributors && ntracklets > fFilterOnTracklets) status = kTRUE; | |
762133f4 | 192 | fTotTracklets += ntracklets; |
193 | fTotTrackletsSq += ntracklets*ntracklets; | |
a3a3a28f | 194 | return status; |
195 | } | |
196 | ||
197 | //______________________________________________________________________ | |
198 | void AliITSMeanVertexer::AddToMean(AliESDVertex *vert){ | |
199 | // update mean vertex | |
200 | Double_t currentPos[3],currentSigma[3]; | |
201 | vert->GetXYZ(currentPos); | |
202 | vert->GetSigmaXYZ(currentSigma); | |
203 | Bool_t goon = kTRUE; | |
204 | for(Int_t i=0;i<3;i++)if(currentSigma[i] == 0.)goon = kFALSE; | |
205 | if(!goon)return; | |
206 | for(Int_t i=0;i<3;i++){ | |
762133f4 | 207 | fWeighPosSum[i]+=currentPos[i]/currentSigma[i]/currentSigma[i]; |
208 | fWeighSigSum[i]+=1./currentSigma[i]/currentSigma[i]; | |
209 | fAverPosSum[i]+=currentPos[i]; | |
a3a3a28f | 210 | } |
211 | for(Int_t i=0;i<3;i++){ | |
212 | for(Int_t j=i;j<3;j++){ | |
762133f4 | 213 | fAverPosSqSum[i][j] += currentPos[i] * currentPos[j]; |
a3a3a28f | 214 | } |
215 | } | |
37add1d1 | 216 | |
217 | fVertexXY->Fill(currentPos[0],currentPos[1]); | |
218 | fVertexZ->Fill(currentPos[2]); | |
219 | ||
a3a3a28f | 220 | fNoEventsContr++; |
221 | } | |
222 | ||
223 | //______________________________________________________________________ | |
224 | Bool_t AliITSMeanVertexer::ComputeMean(){ | |
225 | // compute mean vertex | |
226 | if(fNoEventsContr < 2) return kFALSE; | |
227 | Double_t nevents = fNoEventsContr; | |
228 | for(Int_t i=0;i<3;i++){ | |
762133f4 | 229 | fWeighPos[i] = fWeighPosSum[i]/fWeighSigSum[i]; |
230 | fWeighSig[i] = 1./TMath::Sqrt(fWeighSigSum[i]); | |
231 | fAverPos[i] = fAverPosSum[i]/nevents; | |
a3a3a28f | 232 | } |
233 | for(Int_t i=0;i<3;i++){ | |
234 | for(Int_t j=i;j<3;j++){ | |
762133f4 | 235 | fAverPosSq[i][j] = fAverPosSqSum[i][j]/(nevents -1.); |
a3a3a28f | 236 | fAverPosSq[i][j] -= nevents/(nevents -1.)*fAverPos[i]*fAverPos[j]; |
237 | } | |
238 | } | |
762133f4 | 239 | |
240 | fAverTracklets = fTotTracklets/nevents; | |
241 | fSigmaOnAverTracks = fTotTrackletsSq/(nevents - 1); | |
242 | fSigmaOnAverTracks -= nevents/(nevents -1.)*fAverTracklets*fAverTracklets; | |
a3a3a28f | 243 | fSigmaOnAverTracks = TMath::Sqrt(fSigmaOnAverTracks); |
244 | return kTRUE; | |
245 | } |