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c95d6417 | 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 | **************************************************************************/ | |
c5f0f3c1 | 15 | #include <AliITSVertexerPPZ.h> |
c5f0f3c1 | 16 | #include <TArrayF.h> |
c5f0f3c1 | 17 | #include <TH1F.h> |
c5f0f3c1 | 18 | #include <TObjArray.h> |
19 | #include <TTree.h> | |
20 | #include <TClonesArray.h> | |
7d62fb64 | 21 | #include "AliITSDetTypeRec.h" |
c5f0f3c1 | 22 | #include "AliITSgeom.h" |
88cb7938 | 23 | #include "AliITSLoader.h" |
c5f0f3c1 | 24 | #include "AliITSRecPoint.h" |
25 | ///////////////////////////////////////////////////////////////////////// | |
26 | // // | |
27 | // This class is intended to compute the Z coordinate of the // | |
28 | // primary vertex for p-p interactions, or in general when the // | |
29 | // number of secondaries is too slow to use the class // | |
30 | // AliITSVertexerIons, which in turn is optimized for A-A collsions // | |
31 | // Origin: masera@to.infn.it 9/12/2002 // | |
32 | // // | |
33 | ///////////////////////////////////////////////////////////////////////// | |
34 | ClassImp(AliITSVertexerPPZ) | |
35 | ||
36 | ||
37 | ||
38 | //______________________________________________________________________ | |
8221b41b | 39 | AliITSVertexerPPZ::AliITSVertexerPPZ():AliITSVertexer(), |
40 | fFirstL1(0), | |
41 | fLastL1(0), | |
42 | fFirstL2(0), | |
43 | fLastL2(0), | |
44 | fDiffPhiMax(0), | |
45 | fX0(0), | |
46 | fY0(0), | |
47 | fZFound(0), | |
48 | fZsig(0), | |
49 | fWindow(0){ | |
c5f0f3c1 | 50 | // Default Constructor |
51 | ||
52 | SetDiffPhiMax(0); | |
c5f0f3c1 | 53 | SetFirstLayerModules(0); |
54 | SetSecondLayerModules(0); | |
7d62fb64 | 55 | //fITS = 0; |
c95d6417 | 56 | SetWindow(0); |
c5f0f3c1 | 57 | } |
58 | ||
8221b41b | 59 | AliITSVertexerPPZ::AliITSVertexerPPZ(TString fn, Float_t x0, Float_t y0):AliITSVertexer(fn), |
60 | fFirstL1(0), | |
61 | fLastL1(0), | |
62 | fFirstL2(0), | |
63 | fLastL2(0), | |
64 | fDiffPhiMax(0), | |
65 | fX0(x0), | |
66 | fY0(y0), | |
67 | fZFound(0), | |
68 | fZsig(0), | |
69 | fWindow(0) { | |
c5f0f3c1 | 70 | // Standard constructor |
c5f0f3c1 | 71 | SetDiffPhiMax(); |
72 | fX0 = x0; | |
73 | fY0 = y0; | |
74 | SetFirstLayerModules(); | |
75 | SetSecondLayerModules(); | |
7d62fb64 | 76 | //fITS = 0; |
c95d6417 | 77 | SetWindow(); |
c5f0f3c1 | 78 | } |
79 | ||
80 | //______________________________________________________________________ | |
81 | AliITSVertexerPPZ::~AliITSVertexerPPZ() { | |
82 | // Default Destructor | |
7d62fb64 | 83 | //fITS = 0; |
c5f0f3c1 | 84 | } |
85 | ||
86 | //________________________________________________________ | |
87 | void AliITSVertexerPPZ::EvalZ(TH1F *hist,Int_t sepa, Int_t ncoinc, TArrayF *zval) { | |
7d62fb64 | 88 | |
89 | //Evaluation of Z | |
90 | Float_t deltaVal = hist->GetBinWidth(1)*fWindow; // max window in Z for searching | |
c5f0f3c1 | 91 | fZFound=0; |
92 | fZsig=0; | |
7d62fb64 | 93 | Int_t nN=0; |
94 | Int_t nbinNotZero=0; | |
c5f0f3c1 | 95 | Float_t totst = 0.; |
96 | Float_t totst2 = 0.; | |
97 | Float_t curz = 0.; | |
98 | for(Int_t i=1;i<=sepa;i++){ | |
99 | Float_t cont=hist->GetBinContent(i); | |
c95d6417 | 100 | if(cont!=0)curz = hist->GetBinLowEdge(i)+0.5*hist->GetBinWidth(i); |
c5f0f3c1 | 101 | totst+=cont; |
102 | totst2+=cont*cont; | |
7d62fb64 | 103 | nN++; |
104 | if(cont!=0)nbinNotZero++; | |
c5f0f3c1 | 105 | } |
7d62fb64 | 106 | if(nbinNotZero==0){fZFound=-100; fZsig=-100; return;} |
107 | if(nbinNotZero==1){ | |
c95d6417 | 108 | fZFound = curz; |
109 | fZsig=0; | |
7d62fb64 | 110 | fCurrentVertex = new AliESDVertex(fZFound,fZsig,nbinNotZero); |
c95d6417 | 111 | return; |
112 | } | |
7d62fb64 | 113 | Float_t errsq = totst2/(nN-1)-totst*totst/nN/(nN-1); |
c95d6417 | 114 | if(errsq>=0){ |
115 | totst2=TMath::Sqrt(errsq); | |
116 | } | |
117 | else { | |
7d62fb64 | 118 | Error("EvalZ","Negative variance: %d - %12.7f - %12.7f",nN,totst2,totst); |
c95d6417 | 119 | fZFound=-100; |
120 | fZsig=-100; | |
121 | return; | |
122 | } | |
7d62fb64 | 123 | totst /= nN; |
c95d6417 | 124 | Float_t cut = totst+totst2*2.; |
27167524 | 125 | // if(fDebug>1)cout<<"totst, totst2, cut: "<<totst<<", "<<totst2<<", "<<cut<<endl; |
c5f0f3c1 | 126 | Float_t val1=hist->GetBinLowEdge(sepa); |
127 | Float_t val2=hist->GetBinLowEdge(1); | |
c95d6417 | 128 | Float_t valm = 0.; |
129 | Float_t zmax = 0.; | |
c5f0f3c1 | 130 | for(Int_t i=1;i<=sepa;i++){ |
131 | Float_t cont=hist->GetBinContent(i); | |
c95d6417 | 132 | if(cont>valm){ |
133 | valm = cont; | |
134 | zmax = hist->GetBinLowEdge(i)+0.5*hist->GetBinWidth(1); | |
135 | } | |
136 | if(cont>cut){ | |
c5f0f3c1 | 137 | curz=hist->GetBinLowEdge(i); |
138 | if(curz<val1)val1=curz; | |
139 | if(curz>val2)val2=curz; | |
140 | } | |
141 | } | |
142 | val2+=hist->GetBinWidth(1); | |
7d62fb64 | 143 | if((val2-val1)>deltaVal){ |
144 | val1 = zmax-deltaVal/2.; | |
145 | val2 = zmax+deltaVal/2.; | |
27167524 | 146 | // if(fDebug>0)cout<<"val1 and val2 recomputed\n"; |
c95d6417 | 147 | } |
27167524 | 148 | // if(fDebug>0)cout<<"Values for Z finding: "<<val1<<" "<<val2<<" "<<val2-val1<<endl; |
c5f0f3c1 | 149 | fZFound=0; |
150 | fZsig=0; | |
7d62fb64 | 151 | nN=0; |
c5f0f3c1 | 152 | for(Int_t i=0; i<ncoinc; i++){ |
153 | Float_t z=zval->At(i); | |
154 | if(z<val1)continue; | |
155 | if(z>val2)continue; | |
c95d6417 | 156 | |
c5f0f3c1 | 157 | fZFound+=z; |
158 | fZsig+=z*z; | |
c95d6417 | 159 | /* weights defined by the curvature |
160 | Float_t wei = 1./curv->At(i); | |
161 | fZFound+=z*wei; | |
162 | fZsig+=wei; | |
163 | */ | |
7d62fb64 | 164 | nN++; |
c5f0f3c1 | 165 | } |
7d62fb64 | 166 | if(nN<1){fZFound=-110; fZsig=-110; return;} |
167 | if(nN==1){ | |
c95d6417 | 168 | fZsig = 0; |
7d62fb64 | 169 | fCurrentVertex = new AliESDVertex(fZFound,fZsig,nN); |
c95d6417 | 170 | return; |
171 | } | |
7d62fb64 | 172 | errsq = (fZsig/(nN-1)-fZFound*fZFound/nN/(nN-1))/nN; |
c95d6417 | 173 | if(errsq>=0.){ |
174 | fZsig=TMath::Sqrt(errsq); | |
175 | } | |
176 | else { | |
7d62fb64 | 177 | Error("evalZ","Negative variance: %d - %12.7f %12.7f",nN,fZsig,fZFound); |
c95d6417 | 178 | fZsig=0; |
179 | } | |
7d62fb64 | 180 | fZFound=fZFound/nN; |
c95d6417 | 181 | /* weights defined by the curvature |
182 | fZsig=1./fZsig; | |
183 | fZFound*=fZsig; | |
184 | fZsig = TMath::Sqrt(fZsig); | |
185 | */ | |
7d62fb64 | 186 | fCurrentVertex = new AliESDVertex(fZFound,fZsig,nN); |
c5f0f3c1 | 187 | } |
188 | ||
189 | //______________________________________________________________________ | |
d681bb2d | 190 | AliESDVertex* AliITSVertexerPPZ::FindVertexForCurrentEvent(Int_t evnumber){ |
191 | // Defines the AliESDVertex for the current event | |
c5f0f3c1 | 192 | fCurrentVertex = 0; |
193 | fZFound = -999; | |
194 | fZsig = -999; | |
88cb7938 | 195 | AliRunLoader *rl =AliRunLoader::GetRunLoader(); |
7d62fb64 | 196 | AliITSLoader* iTSloader = (AliITSLoader*)rl->GetLoader("ITSLoader"); |
197 | TDirectory * olddir = gDirectory; | |
198 | rl->CdGAFile(); | |
199 | AliITSgeom* geom = (AliITSgeom*)gDirectory->Get("AliITSgeom"); | |
200 | olddir->cd(); | |
201 | ||
202 | AliITSDetTypeRec detTypeRec; | |
203 | ||
c5f0f3c1 | 204 | if(!geom) { |
205 | Error("FindVertexForCurrentEvent","ITS geometry is not defined"); | |
206 | return fCurrentVertex; | |
207 | } | |
2257f27e | 208 | TTree *tR=0; |
209 | TClonesArray *itsRec = 0; | |
c5f0f3c1 | 210 | Float_t lc[3]; for(Int_t ii=0; ii<3; ii++) lc[ii]=0.; |
211 | Float_t gc[3]; for(Int_t ii=0; ii<3; ii++) gc[ii]=0.; | |
212 | Float_t lc2[3]; for(Int_t ii=0; ii<3; ii++) lc2[ii]=0.; | |
213 | Float_t gc2[3]; for(Int_t ii=0; ii<3; ii++) gc2[ii]=0.; | |
214 | ||
7d62fb64 | 215 | tR = iTSloader->TreeR(); |
2257f27e | 216 | if(!tR){ |
c5f0f3c1 | 217 | Error("FindVertexForCurrentEvent","TreeR not found"); |
218 | return fCurrentVertex; | |
219 | } | |
7d62fb64 | 220 | detTypeRec.SetTreeAddressR(tR); |
221 | itsRec = detTypeRec.RecPoints(); | |
c5f0f3c1 | 222 | // missing |
00a7cc50 | 223 | // TClonesArray dummy("AliITSRecPoint",10000), *clusters=&dummy; |
2257f27e | 224 | TBranch *branch; |
00a7cc50 | 225 | branch = tR->GetBranch("ITSRecPoints"); |
226 | if(!branch){ | |
227 | branch = tR->GetBranch("ITSRecPointsF"); | |
c5f0f3c1 | 228 | } |
00a7cc50 | 229 | //} |
c5f0f3c1 | 230 | if(!branch){ |
231 | Error("FindVertexForCurrentEvent","branch for ITS rec points not found"); | |
232 | return fCurrentVertex; | |
233 | } | |
234 | Float_t zave=0; | |
235 | Float_t rmszav=0; | |
236 | Float_t zave2=0; | |
237 | Int_t firipixe=0; | |
238 | for(Int_t module= fFirstL1; module<=fLastL1;module++){ | |
239 | branch->GetEvent(module); | |
2257f27e | 240 | Int_t nrecp1 = itsRec->GetEntries(); |
c5f0f3c1 | 241 | for(Int_t i=0; i<nrecp1;i++){ |
2257f27e | 242 | AliITSRecPoint *current = (AliITSRecPoint*)itsRec->At(i); |
00a7cc50 | 243 | lc[0]=current->GetDetLocalX(); |
244 | lc[2]=current->GetDetLocalZ(); | |
c5f0f3c1 | 245 | geom->LtoG(module,lc,gc); |
246 | zave+=gc[2]; | |
247 | zave2+=gc[2]*gc[2]; | |
248 | firipixe++; | |
249 | } | |
7d62fb64 | 250 | detTypeRec.ResetRecPoints(); |
c5f0f3c1 | 251 | } |
252 | if(firipixe>1){ | |
253 | rmszav=TMath::Sqrt(zave2/(firipixe-1)-zave*zave/firipixe/(firipixe-1)); | |
254 | zave=zave/firipixe; | |
27167524 | 255 | // if(fDebug>1)cout<<"++++++++++++++++++++++++++++++++++++++++++++++++++++++\n Number of firing pixels: "<<firipixe<<endl; |
c5f0f3c1 | 256 | } |
257 | else { | |
258 | fZFound = -200; | |
259 | fZsig = -200; | |
260 | Warning("FindVertexForCurrentEvent","No rec points on first layer for this event"); | |
261 | return fCurrentVertex; | |
262 | } | |
263 | Float_t zlim1=zave-rmszav; | |
264 | Float_t zlim2=zave+rmszav; | |
265 | Int_t sepa=(Int_t)((zlim2-zlim1)*10.+1.); | |
266 | zlim2=zlim1 + sepa/10.; | |
267 | TH1F *zvdis = new TH1F("z_ev","zv distr",sepa,zlim1,zlim2); | |
27167524 | 268 | /* |
269 | if(fDebug>0){ | |
270 | cout<<"Z limits: "<<zlim1<<" "<<zlim2<<"; Bins= "<<sepa<<endl; | |
271 | cout<<"Bin width: "<<zvdis->GetBinWidth(1)*10000.<<" micron\n"; | |
272 | } | |
273 | */ | |
c5f0f3c1 | 274 | Int_t sizarr=100; |
275 | TArrayF *zval = new TArrayF(sizarr); | |
c95d6417 | 276 | // TArrayF *curv = new TArrayF(sizarr); |
c5f0f3c1 | 277 | Int_t ncoinc=0; |
278 | for(Int_t module= fFirstL1; module<=fLastL1;module++){ | |
27167524 | 279 | // if(fDebug>0)cout<<"processing module "<<module<<" \r"; |
c5f0f3c1 | 280 | branch->GetEvent(module); |
2257f27e | 281 | Int_t nrecp1 = itsRec->GetEntries(); |
c5f0f3c1 | 282 | TObjArray *poiL1 = new TObjArray(nrecp1); |
2257f27e | 283 | for(Int_t i=0; i<nrecp1;i++)poiL1->AddAt(itsRec->At(i),i); |
7d62fb64 | 284 | detTypeRec.ResetRecPoints(); |
c5f0f3c1 | 285 | for(Int_t i=0; i<nrecp1;i++){ |
286 | AliITSRecPoint *current = (AliITSRecPoint*)poiL1->At(i); | |
00a7cc50 | 287 | lc[0]=current->GetDetLocalX(); |
288 | lc[2]=current->GetDetLocalZ(); | |
c5f0f3c1 | 289 | geom->LtoG(module,lc,gc); |
290 | gc[0]-=fX0; | |
291 | gc[1]-=fY0; | |
292 | Float_t r1=TMath::Sqrt(gc[0]*gc[0]+gc[1]*gc[1]); | |
293 | Float_t phi1 = TMath::ATan2(gc[1],gc[0]); | |
294 | if(phi1<0)phi1=2*TMath::Pi()+phi1; | |
27167524 | 295 | // if(fDebug>1)cout<<"module "<<module<<" "<<gc[0]<<" "<<gc[1]<<" "<<gc[2]<<" "<<phi1<<" \n"; |
c5f0f3c1 | 296 | for(Int_t modul2=fFirstL2; modul2<=fLastL2; modul2++){ |
297 | branch->GetEvent(modul2); | |
2257f27e | 298 | Int_t nrecp2 = itsRec->GetEntries(); |
c5f0f3c1 | 299 | for(Int_t j=0; j<nrecp2;j++){ |
2257f27e | 300 | AliITSRecPoint *recp = (AliITSRecPoint*)itsRec->At(j); |
00a7cc50 | 301 | lc2[0]=recp->GetDetLocalX(); |
302 | lc2[2]=recp->GetDetLocalZ(); | |
c5f0f3c1 | 303 | geom->LtoG(modul2,lc2,gc2); |
304 | gc2[0]-=fX0; | |
305 | gc2[1]-=fY0; | |
306 | Float_t r2=TMath::Sqrt(gc2[0]*gc2[0]+gc2[1]*gc2[1]); | |
307 | Float_t zr0=(r2*gc[2]-r1*gc2[2])/(r2-r1); | |
308 | Float_t phi2 = TMath::ATan2(gc2[1],gc2[0]); | |
309 | if(phi2<0)phi2=2.*TMath::Pi()+phi2; | |
310 | Float_t diff = TMath::Abs(phi2-phi1); | |
311 | if(diff>TMath::Pi())diff=2.*TMath::Pi()-diff; | |
312 | if(zr0>zlim1 && zr0<zlim2){ | |
313 | if(diff<fDiffPhiMax ){ | |
314 | zvdis->Fill(zr0); | |
315 | zval->AddAt(zr0,ncoinc); | |
c95d6417 | 316 | /* uncomment these lines to use curvature as a weight |
317 | Float_t cu = Curv(0.,0.,gc[0],gc[1],gc2[0],gc[1]); | |
318 | curv->AddAt(cu,ncoinc); | |
319 | */ | |
c5f0f3c1 | 320 | ncoinc++; |
321 | if(ncoinc==(sizarr-1)){ | |
322 | sizarr+=100; | |
323 | zval->Set(sizarr); | |
c95d6417 | 324 | //uncomment next line to use curvature as weight |
325 | // curv->Set(sizarr); | |
c5f0f3c1 | 326 | } |
327 | } | |
328 | } | |
329 | } | |
7d62fb64 | 330 | detTypeRec.ResetRecPoints(); |
c5f0f3c1 | 331 | } |
332 | } | |
333 | delete poiL1; | |
334 | } // loop on modules | |
27167524 | 335 | /* |
336 | if(fDebug>0){ | |
337 | cout<<endl<<"Number of coincidences = "<<ncoinc<<endl; | |
338 | } | |
339 | */ | |
c95d6417 | 340 | // EvalZ(zvdis,sepa,ncoinc,zval,curv); |
c5f0f3c1 | 341 | EvalZ(zvdis,sepa,ncoinc,zval); |
342 | delete zvdis; | |
343 | delete zval; | |
c95d6417 | 344 | // delete curv; |
c5f0f3c1 | 345 | if(fCurrentVertex){ |
346 | char name[30]; | |
347 | sprintf(name,"Vertex_%d",evnumber); | |
88cb7938 | 348 | // fCurrentVertex->SetName(name); |
c5f0f3c1 | 349 | fCurrentVertex->SetTitle("vertexer: PPZ"); |
350 | } | |
7d62fb64 | 351 | |
c5f0f3c1 | 352 | return fCurrentVertex; |
353 | } | |
354 | ||
355 | //______________________________________________________________________ | |
356 | void AliITSVertexerPPZ::FindVertices(){ | |
357 | // computes the vertices of the events in the range FirstEvent - LastEvent | |
88cb7938 | 358 | AliRunLoader *rl = AliRunLoader::GetRunLoader(); |
7d62fb64 | 359 | AliITSLoader* iTSloader = (AliITSLoader*) rl->GetLoader("ITSLoader"); |
360 | iTSloader->ReloadRecPoints(); | |
ab6a6f40 | 361 | for(Int_t i=fFirstEvent;i<=fLastEvent;i++){ |
88cb7938 | 362 | cout<<"Processing event "<<i<<endl; |
363 | rl->GetEvent(i); | |
c5f0f3c1 | 364 | FindVertexForCurrentEvent(i); |
365 | if(fCurrentVertex){ | |
366 | WriteCurrentVertex(); | |
367 | } | |
368 | else { | |
27167524 | 369 | /* |
370 | if(fDebug>0){ | |
371 | cout<<"Vertex not found for event "<<i<<endl; | |
372 | cout<<"fZFound = "<<fZFound<<", fZsig= "<<fZsig<<endl; | |
373 | } | |
374 | */ | |
c5f0f3c1 | 375 | } |
376 | } | |
c5f0f3c1 | 377 | } |
378 | ||
379 | //________________________________________________________ | |
380 | void AliITSVertexerPPZ::PrintStatus() const { | |
381 | // Print current status | |
382 | cout <<"=======================================================\n"; | |
383 | cout <<" First layer first and last modules: "<<fFirstL1<<", "; | |
384 | cout <<fLastL1<<endl; | |
385 | cout <<" Second layer first and last modules: "<<fFirstL2<<", "; | |
386 | cout <<fLastL2<<endl; | |
387 | cout <<" Max Phi difference: "<<fDiffPhiMax<<endl; | |
c95d6417 | 388 | cout <<" Window for Z search: "<<fWindow<<endl; |
c5f0f3c1 | 389 | cout <<" Current Z "<<fZFound<<"; Z sig "<<fZsig<<endl; |
c5f0f3c1 | 390 | cout<<"First event to be processed "<<fFirstEvent; |
391 | cout<<"\n Last event to be processed "<<fLastEvent<<endl; | |
392 | } | |
c95d6417 | 393 | |
394 | //________________________________________________________ | |
395 | Float_t AliITSVertexerPPZ::Curv(Double_t x1,Double_t y1, | |
396 | Double_t x2,Double_t y2, | |
397 | Double_t x3,Double_t y3) | |
398 | { | |
399 | //----------------------------------------------------------------- | |
400 | // Initial approximation of the track curvature (Y. Belikov) squared | |
401 | //----------------------------------------------------------------- | |
402 | Double_t d=(x2-x1)*(y3-y2)-(x3-x2)*(y2-y1); | |
403 | Double_t a=0.5*((y3-y2)*(y2*y2-y1*y1+x2*x2-x1*x1)- | |
404 | (y2-y1)*(y3*y3-y2*y2+x3*x3-x2*x2)); | |
405 | Double_t b=0.5*((x2-x1)*(y3*y3-y2*y2+x3*x3-x2*x2)- | |
406 | (x3-x2)*(y2*y2-y1*y1+x2*x2-x1*x1)); | |
407 | ||
408 | Double_t xr=TMath::Abs(d/(d*x1-a)), yr=d/(d*y1-b); | |
409 | ||
410 | Float_t val = (Float_t)(( -xr*yr/TMath::Sqrt(xr*xr+yr*yr)) | |
411 | *( -xr*yr/TMath::Sqrt(xr*xr+yr*yr))); | |
412 | return val; | |
413 | } |