3 /**************************************************************************
4 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
6 * Author: The ALICE Off-line Project. *
7 * Contributors are mentioned in the code where appropriate. *
9 * Permission to use, copy, modify and distribute this software and its *
10 * documentation strictly for non-commercial purposes is hereby granted *
11 * without fee, provided that the above copyright notice appears in all *
12 * copies and that both the copyright notice and this permission notice *
13 * appear in the supporting documentation. The authors make no claims *
14 * about the suitability of this software for any purpose. It is *
15 * provided "as is" without express or implied warranty. *
16 **************************************************************************/
17 #include "AliHLTITSVertexerZ.h"
24 #include "AliITSLoader.h"
25 #include <AliITSgeom.h>
26 #include <AliITSgeomTGeo.h>
27 #include <AliITSRecPoint.h>
28 #include <AliITSclusterV2.h>
30 //-------------------------------------------------------------------------
31 // Implementation of the HLT ITS vertexer class
33 // Origin: Cvetan Cheshkov, CERN, Cvetan.Cheshkov@cern.ch
34 //-------------------------------------------------------------------------
36 ClassImp(AliHLTITSVertexerZ)
38 AliHLTITSVertexerZ::AliHLTITSVertexerZ():
43 // Constructor in case that there is no runloader
47 AliHLTITSVertexerZ::AliHLTITSVertexerZ(Float_t x0, Float_t y0):
48 AliITSVertexerZ(x0,y0),
52 // Standard Constructor
56 AliHLTITSVertexerZ::~AliHLTITSVertexerZ()
59 if (fZCombf) delete fZCombf;
62 //______________________________________________________________________
63 AliESDVertex* AliHLTITSVertexerZ::FindVertexForCurrentEvent(AliITSgeom* /* geom */,TTree *tR){
64 // Defines the AliESDVertex for the current event
68 Double_t lc[3]; for(Int_t ii=0; ii<3; ii++) lc[ii]=0.;
69 Double_t gc[3]; for(Int_t ii=0; ii<3; ii++) gc[ii]=0.;
70 //Float_t lc2[3]; for(Int_t ii=0; ii<3; ii++) lc2[ii]=0.;
71 //Float_t gc2[3]; for(Int_t ii=0; ii<3; ii++) gc2[ii]=0.;
73 TClonesArray dummy("AliITSclusterV2",10000), *clusters=&dummy;
75 branch = tR->GetBranch("Clusters");
76 branch->SetAddress(&clusters);
80 for(Int_t module= fFirstL1; module<=fLastL1;module++){
81 if(module%4==0 || module%4==3)continue;
82 // cout<<"Procesing module "<<module<<" ";
84 // cout<<"Number of clusters "<<clusters->GetEntries()<<endl;
85 nrpL1+= clusters->GetEntriesFast();
87 for(Int_t module= fFirstL2; module<=fLastL2;module++){
89 nrpL2+= clusters->GetEntriesFast();
91 if(nrpL1 == 0 || nrpL2 == 0){
93 return fCurrentVertex;
96 Int_t nPhiBins = (Int_t)(TMath::Pi()/fDiffPhiMax);
97 Float_t phiBinSize = 2*TMath::Pi()/(Float_t)nPhiBins;
99 Int_t maxind1 = 2*nrpL1/nPhiBins;
100 Float_t **zc1 = new Float_t *[nPhiBins];
101 Float_t **phi1 = new Float_t *[nPhiBins];
102 Float_t **r1 = new Float_t *[nPhiBins];
103 Int_t *ind1 = new Int_t [nPhiBins];
104 Int_t maxind2 = 2*nrpL2/nPhiBins;
105 Float_t **zc2 = new Float_t *[nPhiBins];
106 Float_t **phi2 = new Float_t *[nPhiBins];
107 Float_t **r2 = new Float_t *[nPhiBins];
108 Int_t *ind2 = new Int_t [nPhiBins];
109 for(Int_t i=0;i<nPhiBins;i++) {
110 zc1[i] = new Float_t [maxind1];
111 phi1[i] = new Float_t [maxind1];
112 r1[i] = new Float_t [maxind1];
113 zc2[i] = new Float_t [maxind2];
114 phi2[i] = new Float_t [maxind2];
115 r2[i] = new Float_t [maxind2];
119 Float_t zshift[4] = {-10.708000, -3.536000, 3.536000, 10.708000};
122 memset(ind1,0,nPhiBins*sizeof(Int_t));
123 for(Int_t module= fFirstL1; module<=fLastL1;module++){
124 if(module%4==0 || module%4==3)continue;
125 tR->GetEvent(module);
126 Int_t nrecp1 = clusters->GetEntriesFast();
127 for(Int_t j=0;j<nrecp1;j++){
128 AliITSclusterV2 *recp = (AliITSclusterV2*)clusters->UncheckedAt(j);
129 lc[0]=-recp->GetY()+yshift;
130 lc[2]=-recp->GetZ()+zshift[module%4];
131 AliITSgeomTGeo::LocalToGlobal(module,lc,gc);
132 // geom->LtoG(module,lc,gc);
133 gc[0]-=GetNominalPos()[0];
134 gc[1]-=GetNominalPos()[1];
138 Float_t phi = TMath::ATan2(gc[1],gc[0]);
139 if(phi<0)phi=2*TMath::Pi()+phi;
140 Int_t bin = (Int_t)(phi/phiBinSize);
141 if(bin>=nPhiBins || bin<0) bin = 0;
142 Int_t ind = ind1[bin];
144 phi1[bin][ind] = phi;
145 zc1[bin][ind]=gc[2]/fStepFine;
146 r1[bin][ind]=sqrt(xc1*xc1+yc1*yc1);
153 memset(ind2,0,nPhiBins*sizeof(Int_t));
154 for(Int_t module= fFirstL2; module<=fLastL2;module++){
155 tR->GetEvent(module);
156 Int_t nrecp2 = clusters->GetEntriesFast();
157 for(Int_t j=0;j<nrecp2;j++){
158 AliITSclusterV2 *recp = (AliITSclusterV2*)clusters->UncheckedAt(j);
159 lc[0]=recp->GetY()+yshift;
160 lc[2]=-recp->GetZ()+zshift[module%4];
161 AliITSgeomTGeo::LocalToGlobal(module,lc,gc);
162 // geom->LtoG(module,lc,gc);
163 gc[0]-=GetNominalPos()[0];
164 gc[1]-=GetNominalPos()[1];
168 Float_t phi = TMath::ATan2(gc[1],gc[0]);
169 if(phi<0)phi=2*TMath::Pi()+phi;
170 Int_t bin = (Int_t)(phi/phiBinSize+0.5);
171 if(bin>=nPhiBins || bin<0) bin = 0;
172 Int_t ind = ind2[bin];
174 phi2[bin][ind] = phi;
175 zc2[bin][ind]=gc[2]/fStepFine;
176 r2[bin][ind]=sqrt(xc2*xc2+yc2*yc2);
182 Int_t nbinfine = static_cast<Int_t>((fHighLim-fLowLim)/fStepFine);
183 Float_t lowz = fLowLim/fStepFine;
184 Int_t *harray = new Int_t[nbinfine];
185 memset(harray,0,nbinfine*sizeof(Int_t));
186 for(Int_t ibin=0;ibin<nPhiBins;ibin++) {
187 Float_t *pphi1 = phi1[ibin];
188 Float_t *pr1 = r1[ibin];
189 Float_t *pzc1 = zc1[ibin];
190 for(Int_t i=0;i<ind1[ibin];i++){
191 for(Int_t jbin=ibin;jbin<=(ibin+1);jbin++) {
193 if(jbin==nPhiBins) jbin2 = 0;
194 Float_t *pphi2 = phi2[jbin2];
195 Float_t *pr2 = r2[jbin2];
196 Float_t *pzc2 = zc2[jbin2];
197 for(Int_t j=0;j<ind2[jbin2];j++){
198 Float_t diff = TMath::Abs(pphi2[j]-pphi1[i]);
199 if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff;
200 if(diff<fDiffPhiMax){
201 Float_t zr0=(pr2[j]*pzc1[i]-pr1[i]*pzc2[j])/(pr2[j]-pr1[i]);
202 Int_t bin = (Int_t)(zr0-lowz);
203 if(bin>=0 && bin<nbinfine){
211 for(Int_t i=0;i<nPhiBins;i++) {
228 Int_t nbinratio = (Int_t)(fStepCoarse/fStepFine+0.5);
229 Int_t nbincoarse = nbinfine/nbinratio;
231 if(fZCombc)delete fZCombc;
232 fZCombc = new TH1F("fZCombc","Z",nbincoarse,fLowLim,fLowLim+nbincoarse*fStepCoarse);
233 if(fZCombf)delete fZCombf;
234 fZCombf = new TH1F("fZCombf","Z",nbinfine,fLowLim,fLowLim+nbinfine*fStepFine);
237 for(Int_t bin=0;bin<nbinfine;bin++) {
238 fZCombf->SetBinContent(bin+1,(Stat_t)harray[bin]);
239 fZCombf->SetBinError(bin+1,TMath::Sqrt((Stat_t)harray[bin]));
240 contents+=(Stat_t)harray[bin];
242 if(counter==nbinratio) {
243 Int_t binc=bin/nbinratio;
244 fZCombc->SetBinContent(binc+1,contents);
245 fZCombc->SetBinError(binc+1,TMath::Sqrt(contents));
253 if(fZCombc->GetEntries()==0){
254 Warning("FindVertexForCurrentEvent","Insufficient number of rec. points\n");
256 return fCurrentVertex;
259 // cout<<"Number of entries in hist. "<<fZCombc->GetEntries()<<endl;
261 Int_t bi = fZCombc->GetMaximumBin();
262 Float_t centre = fZCombc->GetBinCenter(bi);
263 Int_t n1 = static_cast<Int_t>((centre-fZCombc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
264 Int_t n2 = static_cast<Int_t>((centre+fZCombc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
272 for(Int_t n=n1;n<=n2;n++){
273 fZFound+=fZCombf->GetBinCenter(n)*fZCombf->GetBinContent(n);
274 num+=static_cast<Int_t>(fZCombf->GetBinContent(n));
275 fZsig+=fZCombf->GetBinCenter(n)*fZCombf->GetBinCenter(n)*fZCombf->GetBinContent(n);
281 Float_t radi = fZsig/(num-1)-fZFound*fZFound/num/(num-1);
282 if(radi>0.)fZsig=TMath::Sqrt(radi);
286 goon = TMath::Abs(TMath::Abs(fZFound-fZCombf->GetBinCenter(n1))-TMath::Abs(fZFound-fZCombf->GetBinCenter(n2)))>fTolerance;
287 n1 = static_cast<Int_t>((fZFound-fZCombc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
288 n2 = static_cast<Int_t>((fZFound+fZCombc->GetBinWidth(bi)-fZCombf->GetBinLowEdge(0))/fZCombf->GetBinWidth(0));
292 Warning("FindVertexForCurrentEvent","The procedure dows not converge\n");
295 // cout<<"Numer of Iterations "<<niter<<endl<<endl;
296 fCurrentVertex = new AliESDVertex(fZFound,fZsig,num);
297 fCurrentVertex->SetTitle("vertexer: HLT");
300 return fCurrentVertex;