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7d62fb64 | 1 | #include "AliITSDetTypeRec.h" |
b5d712e2 | 2 | #include "AliITSVertexerIons.h" |
cd706e57 | 3 | #include "AliITSVertexerZ.h" |
b5d712e2 | 4 | #include "AliESDVertex.h" |
c5f0f3c1 | 5 | #include "AliITSgeom.h" |
88cb7938 | 6 | #include "AliITSLoader.h" |
c5f0f3c1 | 7 | #include "AliITSRecPoint.h" |
cd706e57 | 8 | #include "AliLog.h" |
b5d712e2 | 9 | #include <TTree.h> |
c5f0f3c1 | 10 | #include <TH1.h> |
11 | #include <TF1.h> | |
b5d712e2 | 12 | |
c5f0f3c1 | 13 | ////////////////////////////////////////////////////////////////////// |
14 | // AliITSVertexerIons is a class for full 3D primary vertex // | |
15 | // finding optimized for Ion-Ion interactions // | |
16 | // // | |
17 | // // | |
18 | // // | |
19 | // // | |
20 | // Written by Giuseppe Lo Re and Francesco Riggi // | |
21 | // Giuseppe.Lore@ct.infn.it // | |
c5f0f3c1 | 22 | // Franco.Riggi@ct.infn.it // |
23 | // // | |
fe4280bf | 24 | // Release date: Mar 2004 // |
c5f0f3c1 | 25 | // // |
26 | // // | |
27 | ////////////////////////////////////////////////////////////////////// | |
28 | ||
c5f0f3c1 | 29 | |
b5d712e2 | 30 | ClassImp(AliITSVertexerIons) |
31 | ||
fe4280bf | 32 | //______________________________________________________________________ |
8221b41b | 33 | AliITSVertexerIons::AliITSVertexerIons():AliITSVertexer(), |
34 | fNpThreshold(0), | |
35 | fMaxDeltaPhi(0), | |
36 | fMaxDeltaZ(0){ | |
c5f0f3c1 | 37 | // Default Constructor |
38 | ||
7d62fb64 | 39 | //fITS = 0; |
83028144 | 40 | SetNpThreshold(); |
fe4280bf | 41 | SetMaxDeltaPhi(); |
42 | SetMaxDeltaZ(); | |
c5f0f3c1 | 43 | } |
44 | ||
45 | //______________________________________________________________________ | |
8221b41b | 46 | AliITSVertexerIons::AliITSVertexerIons(TString fn):AliITSVertexer(fn), |
47 | fNpThreshold(0), | |
48 | fMaxDeltaPhi(0), | |
49 | fMaxDeltaZ(0) { | |
c5f0f3c1 | 50 | // Standard constructor |
88cb7938 | 51 | |
7d62fb64 | 52 | //fITS = 0; |
83028144 | 53 | SetNpThreshold(); |
fe4280bf | 54 | SetMaxDeltaPhi(); |
b5d712e2 | 55 | SetMaxDeltaZ(); |
56 | } | |
8221b41b | 57 | /* |
b5d712e2 | 58 | //______________________________________________________________________ |
59 | AliITSVertexerIons::AliITSVertexerIons(const AliITSVertexerIons &source):AliITSVertexer(source) { | |
60 | // Copy constructor | |
61 | // Copies are not allowed. The method is protected to avoid misuse. | |
62 | Error("AliITSVertexerIons","Copy constructor not allowed\n"); | |
63 | } | |
8221b41b | 64 | */ |
b5d712e2 | 65 | //_________________________________________________________________________ |
8221b41b | 66 | //AliITSVertexerIons& AliITSVertexerIons::operator=(const AliITSVertexerIons &/*source*/) { |
b5d712e2 | 67 | // Assignment operator |
68 | // Assignment is not allowed. The method is protected to avoid misuse. | |
8221b41b | 69 | //Error("= operator","Assignment operator not allowed\n"); |
70 | //return *this; | |
71 | //} | |
c5f0f3c1 | 72 | |
73 | ||
74 | //______________________________________________________________________ | |
75 | AliITSVertexerIons::~AliITSVertexerIons() { | |
76 | // Default Destructor | |
7d62fb64 | 77 | //fITS = 0; |
c5f0f3c1 | 78 | } |
79 | ||
80 | //______________________________________________________________________ | |
b5d712e2 | 81 | AliESDVertex* AliITSVertexerIons::FindVertexForCurrentEvent(Int_t evnumber){ |
82 | // Defines the AliESDVertex for the current event | |
fe4280bf | 83 | |
c5f0f3c1 | 84 | fCurrentVertex = 0; |
fe4280bf | 85 | |
88cb7938 | 86 | AliRunLoader *rl = AliRunLoader::GetRunLoader(); |
7d62fb64 | 87 | AliITSLoader* itsloader = (AliITSLoader*)rl->GetLoader("ITSLoader"); |
88 | TDirectory * olddir = gDirectory; | |
89 | rl->CdGAFile(); | |
90 | AliITSgeom* g2 = (AliITSgeom*)gDirectory->Get("AliITSgeom"); | |
91 | olddir->cd(); | |
92 | ||
fe4280bf | 93 | TTree *tr = itsloader->TreeR(); |
7d62fb64 | 94 | AliITSDetTypeRec detTypeRec; |
95 | ||
96 | detTypeRec.SetTreeAddressR(tr); | |
97 | ||
98 | TClonesArray *recpoints = detTypeRec.RecPoints(); | |
99 | AliITSRecPoint *pnt; | |
100 | ||
88cb7938 | 101 | |
fe4280bf | 102 | Int_t npoints=0; |
103 | Int_t nopoints1=40000; | |
104 | Int_t nopoints2=40000; | |
88cb7938 | 105 | Float_t l[3], p[3]; |
c5f0f3c1 | 106 | |
83028144 | 107 | Double_t *z1, *z2, *y1, *y2, *x1, *x2, *phi1, *phi2, *r1, *r2; |
108 | z1=new Double_t[nopoints1]; | |
109 | z2=new Double_t[nopoints2]; | |
110 | y1=new Double_t[nopoints1]; | |
111 | y2=new Double_t[nopoints2]; | |
112 | x1=new Double_t[nopoints1]; | |
113 | x2=new Double_t[nopoints2]; | |
114 | phi1=new Double_t[nopoints1]; | |
115 | phi2=new Double_t[nopoints2]; | |
116 | r1=new Double_t[nopoints1]; | |
117 | r2=new Double_t[nopoints2]; | |
c5f0f3c1 | 118 | |
fe4280bf | 119 | Double_t mxpiu = 0; |
120 | Double_t mxmeno = 0; | |
121 | Double_t mypiu = 0; | |
122 | Double_t mymeno = 0; | |
123 | Double_t r=0; | |
124 | ||
125 | Int_t np1=0, np2=0; | |
126 | for(Int_t i=g2->GetStartSPD();i<=g2->GetLastSPD();i++) { | |
7d62fb64 | 127 | detTypeRec.ResetRecPoints(); |
fe4280bf | 128 | tr->GetEvent(i); |
129 | npoints = recpoints->GetEntries(); | |
130 | for (Int_t ipoint=0;ipoint<npoints;ipoint++) { | |
131 | pnt = (AliITSRecPoint*)recpoints->UncheckedAt(ipoint); | |
00a7cc50 | 132 | l[0]=pnt->GetDetLocalX(); |
fe4280bf | 133 | l[1]=0; |
00a7cc50 | 134 | l[2]=pnt->GetDetLocalZ(); |
fe4280bf | 135 | g2->LtoG(i, l, p); |
136 | r=TMath::Sqrt(TMath::Power(p[0],2)+TMath::Power(p[1],2)); | |
137 | ||
138 | if(i<80 && TMath::Abs(p[2])<14.35) { | |
139 | y1[np1]=p[1]; | |
140 | x1[np1]=p[0]; | |
141 | z1[np1]=p[2]; | |
142 | if(p[0]>0) mxpiu++; | |
143 | if(p[0]<0) mxmeno++; | |
144 | if(p[1]>0) mypiu++; | |
145 | if(p[1]<0) mymeno++; | |
146 | np1++; | |
2257f27e | 147 | } |
fe4280bf | 148 | if(i>=80 && TMath::Abs(p[2])<14.35) { |
149 | y2[np2]=p[1]; | |
150 | x2[np2]=p[0]; | |
151 | z2[np2]=p[2]; | |
152 | np2++; | |
88cb7938 | 153 | } |
154 | } | |
fe4280bf | 155 | } |
c5f0f3c1 | 156 | |
83028144 | 157 | if(np1<fNpThreshold) { |
cd706e57 | 158 | Warning("FindVertexForCurrentEvent","AliITSVertexerIons finder is not reliable for low multiplicity events. Switching to AliITSVertexerZ with default parameters...\n"); |
83028144 | 159 | Warning("FindVertexForCurrentEvent","N rec points = %d - Threshold is %d",np1,fNpThreshold); |
cd706e57 | 160 | AliITSVertexerZ *dovert = new AliITSVertexerZ("default"); |
83028144 | 161 | fCurrentVertex =dovert->FindVertexForCurrentEvent(rl->GetEventNumber()); |
162 | delete dovert; | |
163 | return fCurrentVertex; | |
164 | } | |
165 | ||
fe4280bf | 166 | if(!np1 || !np2) { |
167 | Error("FindVertexForCurrentEvent","No points in the pixer layers"); | |
83028144 | 168 | return fCurrentVertex; |
fe4280bf | 169 | } |
cd706e57 | 170 | AliDebug(1,Form("N. points layer 1 and 2 : %d %d",np1,np2)); |
fe4280bf | 171 | |
172 | Double_t asparx = (mxpiu-mxmeno)/(mxpiu+mxmeno); | |
173 | Double_t aspary = (mypiu-mymeno)/(mypiu+mymeno); | |
174 | ||
175 | Double_t x0 = 2.86*asparx; | |
176 | Double_t y0 = 2.86*aspary; | |
177 | ||
cd706e57 | 178 | AliDebug(1,Form("Rough xy vertex = %f %f",x0,y0)); |
fe4280bf | 179 | |
180 | for(Int_t i=0;i<np1;i++) { | |
181 | x1[i]-=x0; | |
182 | y1[i]-=y0; | |
183 | PhiFunc(x1[i],y1[i],phi1[i]); | |
184 | r1[i]=TMath::Sqrt(x1[i]*x1[i]+y1[i]*y1[i]); | |
88cb7938 | 185 | } |
fe4280bf | 186 | for(Int_t i=0;i<np2;i++) { |
187 | x2[i]-=x0; | |
188 | y2[i]-=y0; | |
189 | PhiFunc(x2[i],y2[i],phi2[i]); | |
190 | r2[i]=TMath::Sqrt(x2[i]*x2[i]+y2[i]*y2[i]); | |
83028144 | 191 | } |
fe4280bf | 192 | |
193 | Int_t nbinxy=400; | |
194 | Int_t nbinz=400; | |
195 | TH1F *hxv=new TH1F("hxv","",nbinxy,-5,5); | |
196 | TH1F *hyv=new TH1F("hyv","",nbinxy,-5,5); | |
197 | TH1F *hzv=new TH1F("hzv","",nbinz,-15,15); | |
198 | ||
199 | Double_t dphi; | |
200 | for(Int_t j=0; j<np1; j++) { | |
201 | for(Int_t k=0; k<np2; k++) { | |
202 | dphi=TMath::Abs(phi2[k]-phi1[j]); | |
88cb7938 | 203 | if(dphi>180) dphi = 360-dphi; |
fe4280bf | 204 | if(dphi>fMaxDeltaPhi) continue; |
205 | hzv->Fill(z1[j]-(z2[k]-z1[j])/((r2[k]/r1[j])-1)); | |
206 | } | |
88cb7938 | 207 | } |
fe4280bf | 208 | |
209 | // Fitting ... | |
210 | Double_t max; | |
7d62fb64 | 211 | Int_t binMax; |
b5d712e2 | 212 | Double_t maxcenter; |
83028144 | 213 | |
fe4280bf | 214 | max = hzv->GetMaximum(); |
7d62fb64 | 215 | binMax=hzv->GetMaximumBin(); |
216 | maxcenter=hzv->GetBinCenter(binMax); | |
fe4280bf | 217 | Double_t dxy=1.5; |
83028144 | 218 | |
b5d712e2 | 219 | TF1 *fz = new TF1 ("fz","([0]*exp(-0.5*((x-[1])/[2])*((x-[1])/[2])))+[3]",maxcenter-dxy,maxcenter+dxy); |
fe4280bf | 220 | fz->SetParameter(0,max); |
b5d712e2 | 221 | fz->SetParameter(1,maxcenter); |
fe4280bf | 222 | fz->SetParameter(2,0.1); |
223 | fz->SetLineColor(kRed); | |
224 | hzv->Fit("fz","RQ0"); | |
225 | ||
226 | if(TMath::Abs(x0)>0.4 || TMath::Abs(y0)>0.4) { | |
227 | Warning("FindVertexForCurrentEvent","AliITSVertexerIonsGeneral finder is not reliable for events with x and y vertex coordinates too far from the origin of the reference system. Their values will be set to 0.\n"); | |
228 | Double_t position[3]={0,0,fz->GetParameter(1)}; | |
229 | Double_t resolution[3]={0,0,0}; | |
230 | Double_t snr[3]={0,0,0}; | |
231 | Char_t name[30]; | |
cd706e57 | 232 | AliDebug(1,Form("Vertex found for event %d",evnumber)); |
fe4280bf | 233 | sprintf(name,"Vertex"); |
234 | fCurrentVertex = new AliESDVertex(position,resolution,snr,name); | |
83028144 | 235 | return fCurrentVertex; |
88cb7938 | 236 | } |
83028144 | 237 | |
fe4280bf | 238 | for(Int_t j=0; j<np1; j++) { |
239 | for(Int_t k=0; k<np2; k++) { | |
240 | if(TMath::Abs((z1[j]-(z2[k]-z1[j])/((r2[k]/r1[j])-1))-fz->GetParameter(1))>fMaxDeltaZ) continue; | |
241 | if(y2[k]==y1[j]) continue; | |
242 | hxv->Fill(x0+(x2[k]-((x2[k]-x1[j])/(y2[k]-y1[j]))*y2[k])); | |
243 | if(x2[k]==x1[j]) continue; | |
244 | hyv->Fill(y0+(y2[k]-((y2[k]-y1[j])/(x2[k]-x1[j]))*x2[k])); | |
88cb7938 | 245 | } |
246 | } | |
fe4280bf | 247 | |
248 | TF1 *fx = new TF1 ("fx","([0]*exp(-0.5*((x-[1])/[2])*((x-[1])/[2])))+[3]+[4]*x+[5]*x*x",x0-dxy,x0+dxy); | |
249 | fx->SetParameter(0,100); | |
250 | Double_t dist=0.3; | |
b5d712e2 | 251 | Double_t xapprox=FindMaxAround(x0,hxv,dist); |
cd706e57 | 252 | AliDebug(1,Form("xapprox = %f",xapprox)); |
b5d712e2 | 253 | fx->SetParameter(1,xapprox); |
254 | Double_t difcentroid=0.07; | |
255 | fx->SetParLimits(1,xapprox-difcentroid,xapprox+difcentroid); | |
fe4280bf | 256 | fx->SetParameter(2,0.1); |
257 | fx->SetLineColor(kRed); | |
258 | hxv->Fit("fx","RQW0"); | |
83028144 | 259 | |
fe4280bf | 260 | TF1 *fy = new TF1 ("fy","([0]*exp(-0.5*((x-[1])/[2])*((x-[1])/[2])))+[3]+[4]*x+[5]*x*x",y0-dxy,y0+dxy); |
261 | fy->SetParameter(0,100); | |
b5d712e2 | 262 | Double_t yapprox=FindMaxAround(y0,hyv,dist); |
cd706e57 | 263 | AliDebug(1,Form("yapprox = %f",yapprox)); |
b5d712e2 | 264 | fy->SetParameter(1,yapprox); |
265 | fy->SetParLimits(1,yapprox-difcentroid,yapprox+difcentroid); | |
fe4280bf | 266 | fy->SetParameter(2,0.1); |
267 | fy->SetLineColor(kRed); | |
268 | hyv->Fit("fy","RQW0"); | |
83028144 | 269 | |
83028144 | 270 | delete [] z1; |
271 | delete [] z2; | |
272 | delete [] y1; | |
273 | delete [] y2; | |
274 | delete [] x1; | |
275 | delete [] x2; | |
88cb7938 | 276 | delete [] r1; |
277 | delete [] r2; | |
278 | delete [] phi1; | |
279 | delete [] phi2; | |
fe4280bf | 280 | delete hxv; |
281 | delete hyv; | |
282 | delete hzv; | |
283 | ||
284 | Double_t position[3]={fx->GetParameter(1),fy->GetParameter(1),fz->GetParameter(1)}; | |
285 | Double_t resolution[3]={fx->GetParameter(2),fy->GetParameter(2),fz->GetParameter(2)}; | |
286 | Double_t snr[3]={0,0,0}; | |
287 | ||
88cb7938 | 288 | Char_t name[30]; |
cd706e57 | 289 | AliDebug(1,Form("Vertex found for event %d",evnumber)); |
88cb7938 | 290 | sprintf(name,"Vertex"); |
d681bb2d | 291 | fCurrentVertex = new AliESDVertex(position,resolution,snr,name); |
7d62fb64 | 292 | |
88cb7938 | 293 | return fCurrentVertex; |
c5f0f3c1 | 294 | } |
295 | ||
296 | //______________________________________________________________________ | |
fe4280bf | 297 | void AliITSVertexerIons::PhiFunc(Double_t &x,Double_t &y,Double_t &phi) { |
b5d712e2 | 298 | // Method for the computation of the phi angle given x and y. The result is in degrees. |
fe4280bf | 299 | if(y>0 && x>0) phi=(TMath::ATan((Double_t)(y/x))*57.29578); |
300 | if(y>0 && x<0) phi=(TMath::ATan((Double_t)(y/x))*57.29578)+180; | |
301 | if(y<0 && x<0) phi=(TMath::ATan((Double_t)(y/x))*57.29578)+180; | |
302 | if(y<0 && x>0) phi=(TMath::ATan((Double_t)(y/x))*57.29578)+360;; | |
c5f0f3c1 | 303 | } |
304 | ||
305 | //______________________________________________________________________ | |
306 | void AliITSVertexerIons::FindVertices(){ | |
307 | // computes the vertices of the events in the range FirstEvent - LastEvent | |
88cb7938 | 308 | AliRunLoader *rl = AliRunLoader::GetRunLoader(); |
83028144 | 309 | AliITSLoader* itsloader = (AliITSLoader*) rl->GetLoader("ITSLoader"); |
310 | itsloader->LoadRecPoints("read"); | |
ab6a6f40 | 311 | for(Int_t i=fFirstEvent;i<=fLastEvent;i++){ |
88cb7938 | 312 | rl->GetEvent(i); |
c5f0f3c1 | 313 | FindVertexForCurrentEvent(i); |
314 | if(fCurrentVertex){ | |
315 | WriteCurrentVertex(); | |
316 | } | |
317 | else { | |
cd706e57 | 318 | AliDebug(1,Form("Vertex not found for event %d",i)); |
c5f0f3c1 | 319 | } |
320 | } | |
c5f0f3c1 | 321 | } |
322 | ||
323 | //________________________________________________________ | |
324 | void AliITSVertexerIons::PrintStatus() const { | |
325 | // Print current status | |
88cb7938 | 326 | cout <<"=======================================================\n"; |
c5f0f3c1 | 327 | cout<<"First event to be processed "<<fFirstEvent; |
328 | cout<<"\n Last event to be processed "<<fLastEvent<<endl; | |
329 | if(fCurrentVertex)fCurrentVertex->PrintStatus(); | |
330 | } | |
fe4280bf | 331 | |
332 | //________________________________________________________ | |
333 | Double_t AliITSVertexerIons::FindMaxAround(Double_t point, TH1F *h, Double_t distance) { | |
b5d712e2 | 334 | // It finds the maximum of h within point-distance and distance+point. |
335 | Int_t maxcontent=0; | |
336 | Int_t maxbin=0; | |
fe4280bf | 337 | for(Int_t i=0;i<h->GetNbinsX();i++) { |
338 | Int_t content=(Int_t)h->GetBinContent(i); | |
339 | Double_t center=(Double_t)h->GetBinCenter(i); | |
1360bc6f | 340 | if(TMath::Abs(center-point)>distance) continue; |
b5d712e2 | 341 | if(content>maxcontent) {maxcontent=content;maxbin=i;} |
fe4280bf | 342 | } |
b5d712e2 | 343 | Double_t max=h->GetBinCenter(maxbin); |
fe4280bf | 344 | return max; |
345 | } | |
346 | ||
347 |