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