]>
Commit | Line | Data |
---|---|---|
c5f0f3c1 | 1 | #include <AliITSVertexerPPZ.h> |
2 | #include <Riostream.h> | |
3 | #include <TArrayF.h> | |
4 | #include <TDirectory.h> | |
5 | #include <TH1F.h> | |
6 | #include <TMath.h> | |
7 | #include <TObjArray.h> | |
8 | #include <TTree.h> | |
9 | #include <TClonesArray.h> | |
10 | #include "AliRun.h" | |
11 | #include "AliITS.h" | |
12 | #include "AliITSgeom.h" | |
13 | #include "AliITSRecPoint.h" | |
14 | ///////////////////////////////////////////////////////////////////////// | |
15 | // // | |
16 | // This class is intended to compute the Z coordinate of the // | |
17 | // primary vertex for p-p interactions, or in general when the // | |
18 | // number of secondaries is too slow to use the class // | |
19 | // AliITSVertexerIons, which in turn is optimized for A-A collsions // | |
20 | // Origin: masera@to.infn.it 9/12/2002 // | |
21 | // // | |
22 | ///////////////////////////////////////////////////////////////////////// | |
23 | ClassImp(AliITSVertexerPPZ) | |
24 | ||
25 | ||
26 | ||
27 | //______________________________________________________________________ | |
28 | AliITSVertexerPPZ::AliITSVertexerPPZ():AliITSVertexer() { | |
29 | // Default Constructor | |
30 | ||
31 | SetDiffPhiMax(0); | |
32 | fX0 = 0.; | |
33 | fY0 = 0.; | |
34 | SetFirstLayerModules(0); | |
35 | SetSecondLayerModules(0); | |
36 | fZFound = 0; | |
37 | fZsig = 0.; | |
38 | fITS = 0; | |
39 | } | |
40 | ||
41 | AliITSVertexerPPZ::AliITSVertexerPPZ(TFile *infile, TFile *outfile, Float_t x0, Float_t y0):AliITSVertexer(infile,outfile) { | |
42 | // Standard constructor | |
43 | if(!fInFile)Fatal("AliITSVertexerPPZ","No inputfile has been defined!"); | |
44 | SetDiffPhiMax(); | |
45 | fX0 = x0; | |
46 | fY0 = y0; | |
47 | SetFirstLayerModules(); | |
48 | SetSecondLayerModules(); | |
49 | fZFound = 0; | |
50 | fZsig = 0.; | |
51 | fITS = 0; | |
52 | } | |
53 | ||
54 | //______________________________________________________________________ | |
55 | AliITSVertexerPPZ::~AliITSVertexerPPZ() { | |
56 | // Default Destructor | |
57 | fITS = 0; | |
58 | } | |
59 | ||
60 | //________________________________________________________ | |
61 | void AliITSVertexerPPZ::EvalZ(TH1F *hist,Int_t sepa, Int_t ncoinc, TArrayF *zval) { | |
62 | fZFound=0; | |
63 | fZsig=0; | |
64 | Int_t N=0; | |
65 | Int_t NbinNotZero=0; | |
66 | Float_t totst = 0.; | |
67 | Float_t totst2 = 0.; | |
68 | Float_t curz = 0.; | |
69 | for(Int_t i=1;i<=sepa;i++){ | |
70 | Float_t cont=hist->GetBinContent(i); | |
71 | curz = hist->GetBinLowEdge(i)+0.5*hist->GetBinWidth(i); | |
72 | totst+=cont; | |
73 | totst2+=cont*cont; | |
74 | N++; | |
75 | if(cont!=0)NbinNotZero++; | |
76 | } | |
77 | if(NbinNotZero==0){fZFound=-100; fZsig=-100; return;} | |
78 | if(NbinNotZero==1){fZFound = curz; fZsig=-100; return;} | |
79 | totst2=TMath::Sqrt(totst2/(N-1)-totst*totst/N/(N-1)); | |
80 | totst /= N; | |
81 | Float_t val1=hist->GetBinLowEdge(sepa); | |
82 | Float_t val2=hist->GetBinLowEdge(1); | |
83 | for(Int_t i=1;i<=sepa;i++){ | |
84 | Float_t cont=hist->GetBinContent(i); | |
85 | if(cont>(totst+totst2*2.)){ | |
86 | curz=hist->GetBinLowEdge(i); | |
87 | if(curz<val1)val1=curz; | |
88 | if(curz>val2)val2=curz; | |
89 | } | |
90 | } | |
91 | val2+=hist->GetBinWidth(1); | |
92 | if(fDebug>0)cout<<"Values for Z finding: "<<val1<<" "<<val2<<endl; | |
93 | fZFound=0; | |
94 | fZsig=0; | |
95 | N=0; | |
96 | for(Int_t i=0; i<ncoinc; i++){ | |
97 | Float_t z=zval->At(i); | |
98 | if(z<val1)continue; | |
99 | if(z>val2)continue; | |
100 | fZFound+=z; | |
101 | fZsig+=z*z; | |
102 | N++; | |
103 | } | |
104 | if(N<=1){fZFound=-110; fZsig=-110; return;} | |
105 | fZsig=TMath::Sqrt((fZsig/(N-1)-fZFound*fZFound/N/(N-1))/N); | |
106 | fZFound=fZFound/N; | |
107 | fCurrentVertex = new AliITSVertex(fZFound,fZsig,N); | |
108 | } | |
109 | ||
110 | //______________________________________________________________________ | |
111 | AliITSVertex* AliITSVertexerPPZ::FindVertexForCurrentEvent(Int_t evnumber){ | |
112 | // Defines the AliITSVertex for the current event | |
113 | fCurrentVertex = 0; | |
114 | fZFound = -999; | |
115 | fZsig = -999; | |
116 | if(!gAlice)gAlice = (AliRun*)fInFile->Get("gAlice"); | |
117 | if(!gAlice){ | |
118 | Error("FindVertexForCurrentEvent","The AliRun object is not available - nothing done"); | |
119 | return fCurrentVertex; | |
120 | } | |
121 | if(!fITS) { | |
122 | fITS = (AliITS*)gAlice->GetModule("ITS"); | |
123 | if(!fITS) { | |
124 | Error("FindVertexForCurrentEvent","AliITS object was not found"); | |
125 | return fCurrentVertex; | |
126 | } | |
127 | } | |
128 | AliITSgeom *geom = fITS->GetITSgeom(); | |
129 | if(!geom) { | |
130 | Error("FindVertexForCurrentEvent","ITS geometry is not defined"); | |
131 | return fCurrentVertex; | |
132 | } | |
133 | TTree *TR=0; | |
134 | TClonesArray *ITSrec = 0; | |
135 | Float_t lc[3]; for(Int_t ii=0; ii<3; ii++) lc[ii]=0.; | |
136 | Float_t gc[3]; for(Int_t ii=0; ii<3; ii++) gc[ii]=0.; | |
137 | Float_t lc2[3]; for(Int_t ii=0; ii<3; ii++) lc2[ii]=0.; | |
138 | Float_t gc2[3]; for(Int_t ii=0; ii<3; ii++) gc2[ii]=0.; | |
139 | ||
140 | TR = gAlice->TreeR(); | |
141 | if(!TR){ | |
142 | Error("FindVertexForCurrentEvent","TreeR not found"); | |
143 | return fCurrentVertex; | |
144 | } | |
145 | ITSrec = fITS->RecPoints(); // uses slow points or fast points if slow are | |
146 | // missing | |
147 | TBranch *branch = TR->GetBranch("ITSRecPoints"); | |
148 | if(!branch){ | |
149 | branch = TR->GetBranch("ITSRecPointsF"); | |
150 | // Warning("FindVertexForCurrentEvent","Using Fast points"); | |
151 | } | |
152 | if(!branch){ | |
153 | Error("FindVertexForCurrentEvent","branch for ITS rec points not found"); | |
154 | return fCurrentVertex; | |
155 | } | |
156 | Float_t zave=0; | |
157 | Float_t rmszav=0; | |
158 | Float_t zave2=0; | |
159 | Int_t firipixe=0; | |
160 | for(Int_t module= fFirstL1; module<=fLastL1;module++){ | |
161 | branch->GetEvent(module); | |
162 | Int_t nrecp1 = ITSrec->GetEntries(); | |
163 | for(Int_t i=0; i<nrecp1;i++){ | |
164 | AliITSRecPoint *current = (AliITSRecPoint*)ITSrec->At(i); | |
165 | lc[0]=current->GetX(); | |
166 | lc[2]=current->GetZ(); | |
167 | geom->LtoG(module,lc,gc); | |
168 | zave+=gc[2]; | |
169 | zave2+=gc[2]*gc[2]; | |
170 | firipixe++; | |
171 | } | |
172 | fITS->ResetRecPoints(); | |
173 | } | |
174 | if(firipixe>1){ | |
175 | rmszav=TMath::Sqrt(zave2/(firipixe-1)-zave*zave/firipixe/(firipixe-1)); | |
176 | zave=zave/firipixe; | |
177 | } | |
178 | else { | |
179 | fZFound = -200; | |
180 | fZsig = -200; | |
181 | Warning("FindVertexForCurrentEvent","No rec points on first layer for this event"); | |
182 | return fCurrentVertex; | |
183 | } | |
184 | Float_t zlim1=zave-rmszav; | |
185 | Float_t zlim2=zave+rmszav; | |
186 | Int_t sepa=(Int_t)((zlim2-zlim1)*10.+1.); | |
187 | zlim2=zlim1 + sepa/10.; | |
188 | TH1F *zvdis = new TH1F("z_ev","zv distr",sepa,zlim1,zlim2); | |
189 | if(fDebug>0)cout<<"Z limits: "<<zlim1<<" "<<zlim2<<"; Bins= "<<sepa<<endl; | |
190 | Int_t sizarr=100; | |
191 | TArrayF *zval = new TArrayF(sizarr); | |
192 | Int_t ncoinc=0; | |
193 | for(Int_t module= fFirstL1; module<=fLastL1;module++){ | |
194 | if(fDebug>0)cout<<"processing module "<<module<<" \r"; | |
195 | branch->GetEvent(module); | |
196 | Int_t nrecp1 = ITSrec->GetEntries(); | |
197 | TObjArray *poiL1 = new TObjArray(nrecp1); | |
198 | for(Int_t i=0; i<nrecp1;i++)poiL1->AddAt(ITSrec->At(i),i); | |
199 | fITS->ResetRecPoints(); | |
200 | for(Int_t i=0; i<nrecp1;i++){ | |
201 | AliITSRecPoint *current = (AliITSRecPoint*)poiL1->At(i); | |
202 | lc[0]=current->GetX(); | |
203 | lc[2]=current->GetZ(); | |
204 | geom->LtoG(module,lc,gc); | |
205 | gc[0]-=fX0; | |
206 | gc[1]-=fY0; | |
207 | Float_t r1=TMath::Sqrt(gc[0]*gc[0]+gc[1]*gc[1]); | |
208 | Float_t phi1 = TMath::ATan2(gc[1],gc[0]); | |
209 | if(phi1<0)phi1=2*TMath::Pi()+phi1; | |
210 | if(fDebug>1)cout<<"module "<<module<<" "<<gc[0]<<" "<<gc[1]<<" "<<gc[2]<<" "<<phi1<<" \n"; | |
211 | for(Int_t modul2=fFirstL2; modul2<=fLastL2; modul2++){ | |
212 | branch->GetEvent(modul2); | |
213 | Int_t nrecp2 = ITSrec->GetEntries(); | |
214 | for(Int_t j=0; j<nrecp2;j++){ | |
215 | AliITSRecPoint *recp = (AliITSRecPoint*)ITSrec->At(j); | |
216 | lc2[0]=recp->GetX(); | |
217 | lc2[2]=recp->GetZ(); | |
218 | geom->LtoG(modul2,lc2,gc2); | |
219 | gc2[0]-=fX0; | |
220 | gc2[1]-=fY0; | |
221 | Float_t r2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]); | |
222 | Float_t zr0=(r2*gc[2]-r1*gc2[2])/(r2-r1); | |
223 | Float_t phi2 = TMath::ATan2(gc2[1],gc2[0]); | |
224 | if(phi2<0)phi2=2.*TMath::Pi()+phi2; | |
225 | Float_t diff = TMath::Abs(phi2-phi1); | |
226 | if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff; | |
227 | if(zr0>zlim1 && zr0<zlim2){ | |
228 | if(diff<fDiffPhiMax ){ | |
229 | zvdis->Fill(zr0); | |
230 | zval->AddAt(zr0,ncoinc); | |
231 | ncoinc++; | |
232 | if(ncoinc==(sizarr-1)){ | |
233 | sizarr+=100; | |
234 | zval->Set(sizarr); | |
235 | } | |
236 | } | |
237 | } | |
238 | } | |
239 | fITS->ResetRecPoints(); | |
240 | } | |
241 | } | |
242 | delete poiL1; | |
243 | } // loop on modules | |
244 | if(fDebug>0){ | |
245 | cout<<endl<<"Number of coincidences = "<<ncoinc<<endl; | |
246 | } | |
247 | EvalZ(zvdis,sepa,ncoinc,zval); | |
248 | delete zvdis; | |
249 | delete zval; | |
250 | if(fCurrentVertex){ | |
251 | char name[30]; | |
252 | sprintf(name,"Vertex_%d",evnumber); | |
253 | fCurrentVertex->SetName(name); | |
254 | fCurrentVertex->SetTitle("vertexer: PPZ"); | |
255 | } | |
256 | return fCurrentVertex; | |
257 | } | |
258 | ||
259 | //______________________________________________________________________ | |
260 | void AliITSVertexerPPZ::FindVertices(){ | |
261 | // computes the vertices of the events in the range FirstEvent - LastEvent | |
262 | if(!fOutFile){ | |
263 | Error("FindVertices","The output file is not available - nothing done"); | |
264 | return; | |
265 | } | |
266 | if(!gAlice)gAlice = (AliRun*)fInFile->Get("gAlice"); | |
267 | if(!gAlice){ | |
268 | Error("FindVertices","The AliRun object is not available - nothing done"); | |
269 | return; | |
270 | } | |
271 | TDirectory *curdir = gDirectory; | |
272 | fInFile->cd(); | |
273 | for(Int_t i=fFirstEvent;i<fLastEvent;i++){ | |
274 | gAlice->GetEvent(i); | |
275 | FindVertexForCurrentEvent(i); | |
276 | if(fCurrentVertex){ | |
277 | WriteCurrentVertex(); | |
278 | } | |
279 | else { | |
280 | if(fDebug>0){ | |
281 | cout<<"Vertex not found for event "<<i<<endl; | |
282 | cout<<"fZFound = "<<fZFound<<", fZsig= "<<fZsig<<endl; | |
283 | } | |
284 | } | |
285 | } | |
286 | curdir->cd(); | |
287 | } | |
288 | ||
289 | //________________________________________________________ | |
290 | void AliITSVertexerPPZ::PrintStatus() const { | |
291 | // Print current status | |
292 | cout <<"=======================================================\n"; | |
293 | cout <<" First layer first and last modules: "<<fFirstL1<<", "; | |
294 | cout <<fLastL1<<endl; | |
295 | cout <<" Second layer first and last modules: "<<fFirstL2<<", "; | |
296 | cout <<fLastL2<<endl; | |
297 | cout <<" Max Phi difference: "<<fDiffPhiMax<<endl; | |
298 | cout <<" Current Z "<<fZFound<<"; Z sig "<<fZsig<<endl; | |
299 | cout <<" Debug flag: "<<fDebug<<endl; | |
300 | if(fInFile)cout <<" The input file is open\n"; | |
301 | if(!fInFile)cout <<"The input file is not open\n"; | |
302 | if(fOutFile)cout <<"The output file is open\n"; | |
303 | if(fOutFile)cout <<"The output file not is open\n"; | |
304 | cout<<"First event to be processed "<<fFirstEvent; | |
305 | cout<<"\n Last event to be processed "<<fLastEvent<<endl; | |
306 | } |