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7d62fb64 | 1 | #include "AliITSDetTypeRec.h" |
b5d712e2 | 2 | #include "AliITSVertexerIons.h" |
3 | #include "AliITSVertexerPPZ.h" | |
4 | #include "AliESDVertex.h" | |
c5f0f3c1 | 5 | #include "AliITSgeom.h" |
88cb7938 | 6 | #include "AliITSLoader.h" |
c5f0f3c1 | 7 | #include "AliITSRecPoint.h" |
b5d712e2 | 8 | #include <TTree.h> |
c5f0f3c1 | 9 | #include <TH1.h> |
10 | #include <TF1.h> | |
b5d712e2 | 11 | |
c5f0f3c1 | 12 | ////////////////////////////////////////////////////////////////////// |
13 | // AliITSVertexerIons is a class for full 3D primary vertex // | |
14 | // finding optimized for Ion-Ion interactions // | |
15 | // // | |
16 | // // | |
17 | // // | |
18 | // // | |
19 | // Written by Giuseppe Lo Re and Francesco Riggi // | |
20 | // Giuseppe.Lore@ct.infn.it // | |
c5f0f3c1 | 21 | // Franco.Riggi@ct.infn.it // |
22 | // // | |
fe4280bf | 23 | // Release date: Mar 2004 // |
c5f0f3c1 | 24 | // // |
25 | // // | |
26 | ////////////////////////////////////////////////////////////////////// | |
27 | ||
c5f0f3c1 | 28 | |
b5d712e2 | 29 | ClassImp(AliITSVertexerIons) |
30 | ||
fe4280bf | 31 | //______________________________________________________________________ |
8221b41b | 32 | AliITSVertexerIons::AliITSVertexerIons():AliITSVertexer(), |
33 | fNpThreshold(0), | |
34 | fMaxDeltaPhi(0), | |
35 | fMaxDeltaZ(0){ | |
c5f0f3c1 | 36 | // Default Constructor |
37 | ||
7d62fb64 | 38 | //fITS = 0; |
83028144 | 39 | SetNpThreshold(); |
fe4280bf | 40 | SetMaxDeltaPhi(); |
41 | SetMaxDeltaZ(); | |
c5f0f3c1 | 42 | } |
43 | ||
44 | //______________________________________________________________________ | |
8221b41b | 45 | AliITSVertexerIons::AliITSVertexerIons(TString fn):AliITSVertexer(fn), |
46 | fNpThreshold(0), | |
47 | fMaxDeltaPhi(0), | |
48 | fMaxDeltaZ(0) { | |
c5f0f3c1 | 49 | // Standard constructor |
88cb7938 | 50 | |
7d62fb64 | 51 | //fITS = 0; |
83028144 | 52 | SetNpThreshold(); |
fe4280bf | 53 | SetMaxDeltaPhi(); |
b5d712e2 | 54 | SetMaxDeltaZ(); |
55 | } | |
8221b41b | 56 | /* |
b5d712e2 | 57 | //______________________________________________________________________ |
58 | AliITSVertexerIons::AliITSVertexerIons(const AliITSVertexerIons &source):AliITSVertexer(source) { | |
59 | // Copy constructor | |
60 | // Copies are not allowed. The method is protected to avoid misuse. | |
61 | Error("AliITSVertexerIons","Copy constructor not allowed\n"); | |
62 | } | |
8221b41b | 63 | */ |
b5d712e2 | 64 | //_________________________________________________________________________ |
8221b41b | 65 | //AliITSVertexerIons& AliITSVertexerIons::operator=(const AliITSVertexerIons &/*source*/) { |
b5d712e2 | 66 | // Assignment operator |
67 | // Assignment is not allowed. The method is protected to avoid misuse. | |
8221b41b | 68 | //Error("= operator","Assignment operator not allowed\n"); |
69 | //return *this; | |
70 | //} | |
c5f0f3c1 | 71 | |
72 | ||
73 | //______________________________________________________________________ | |
74 | AliITSVertexerIons::~AliITSVertexerIons() { | |
75 | // Default Destructor | |
7d62fb64 | 76 | //fITS = 0; |
c5f0f3c1 | 77 | } |
78 | ||
79 | //______________________________________________________________________ | |
b5d712e2 | 80 | AliESDVertex* AliITSVertexerIons::FindVertexForCurrentEvent(Int_t evnumber){ |
81 | // Defines the AliESDVertex for the current event | |
fe4280bf | 82 | |
c5f0f3c1 | 83 | fCurrentVertex = 0; |
fe4280bf | 84 | |
88cb7938 | 85 | AliRunLoader *rl = AliRunLoader::GetRunLoader(); |
7d62fb64 | 86 | AliITSLoader* itsloader = (AliITSLoader*)rl->GetLoader("ITSLoader"); |
87 | TDirectory * olddir = gDirectory; | |
88 | rl->CdGAFile(); | |
89 | AliITSgeom* g2 = (AliITSgeom*)gDirectory->Get("AliITSgeom"); | |
90 | olddir->cd(); | |
91 | ||
fe4280bf | 92 | TTree *tr = itsloader->TreeR(); |
7d62fb64 | 93 | AliITSDetTypeRec detTypeRec; |
94 | ||
95 | detTypeRec.SetTreeAddressR(tr); | |
96 | ||
97 | TClonesArray *recpoints = detTypeRec.RecPoints(); | |
98 | AliITSRecPoint *pnt; | |
99 | ||
88cb7938 | 100 | |
fe4280bf | 101 | Int_t npoints=0; |
102 | Int_t nopoints1=40000; | |
103 | Int_t nopoints2=40000; | |
88cb7938 | 104 | Float_t l[3], p[3]; |
c5f0f3c1 | 105 | |
83028144 | 106 | Double_t *z1, *z2, *y1, *y2, *x1, *x2, *phi1, *phi2, *r1, *r2; |
107 | z1=new Double_t[nopoints1]; | |
108 | z2=new Double_t[nopoints2]; | |
109 | y1=new Double_t[nopoints1]; | |
110 | y2=new Double_t[nopoints2]; | |
111 | x1=new Double_t[nopoints1]; | |
112 | x2=new Double_t[nopoints2]; | |
113 | phi1=new Double_t[nopoints1]; | |
114 | phi2=new Double_t[nopoints2]; | |
115 | r1=new Double_t[nopoints1]; | |
116 | r2=new Double_t[nopoints2]; | |
c5f0f3c1 | 117 | |
fe4280bf | 118 | Double_t mxpiu = 0; |
119 | Double_t mxmeno = 0; | |
120 | Double_t mypiu = 0; | |
121 | Double_t mymeno = 0; | |
122 | Double_t r=0; | |
123 | ||
124 | Int_t np1=0, np2=0; | |
125 | for(Int_t i=g2->GetStartSPD();i<=g2->GetLastSPD();i++) { | |
7d62fb64 | 126 | detTypeRec.ResetRecPoints(); |
fe4280bf | 127 | tr->GetEvent(i); |
128 | npoints = recpoints->GetEntries(); | |
129 | for (Int_t ipoint=0;ipoint<npoints;ipoint++) { | |
130 | pnt = (AliITSRecPoint*)recpoints->UncheckedAt(ipoint); | |
00a7cc50 | 131 | l[0]=pnt->GetDetLocalX(); |
fe4280bf | 132 | l[1]=0; |
00a7cc50 | 133 | l[2]=pnt->GetDetLocalZ(); |
fe4280bf | 134 | g2->LtoG(i, l, p); |
135 | r=TMath::Sqrt(TMath::Power(p[0],2)+TMath::Power(p[1],2)); | |
136 | ||
137 | if(i<80 && TMath::Abs(p[2])<14.35) { | |
138 | y1[np1]=p[1]; | |
139 | x1[np1]=p[0]; | |
140 | z1[np1]=p[2]; | |
141 | if(p[0]>0) mxpiu++; | |
142 | if(p[0]<0) mxmeno++; | |
143 | if(p[1]>0) mypiu++; | |
144 | if(p[1]<0) mymeno++; | |
145 | np1++; | |
2257f27e | 146 | } |
fe4280bf | 147 | if(i>=80 && TMath::Abs(p[2])<14.35) { |
148 | y2[np2]=p[1]; | |
149 | x2[np2]=p[0]; | |
150 | z2[np2]=p[2]; | |
151 | np2++; | |
88cb7938 | 152 | } |
153 | } | |
fe4280bf | 154 | } |
c5f0f3c1 | 155 | |
83028144 | 156 | if(np1<fNpThreshold) { |
83028144 | 157 | Warning("FindVertexForCurrentEvent","AliITSVertexerIons finder is not reliable for low multiplicity events. Switching to AliITSVertexerPPZ with default parameters...\n"); |
158 | Warning("FindVertexForCurrentEvent","N rec points = %d - Threshold is %d",np1,fNpThreshold); | |
fe4280bf | 159 | AliITSVertexerPPZ *dovert = new AliITSVertexerPPZ("default"); |
83028144 | 160 | fCurrentVertex =dovert->FindVertexForCurrentEvent(rl->GetEventNumber()); |
161 | delete dovert; | |
162 | return fCurrentVertex; | |
163 | } | |
164 | ||
fe4280bf | 165 | if(!np1 || !np2) { |
166 | Error("FindVertexForCurrentEvent","No points in the pixer layers"); | |
83028144 | 167 | return fCurrentVertex; |
fe4280bf | 168 | } |
169 | if(fDebug>0) cout << "N. points layer 1 and 2 : " << np1 << " " << np2 << endl; | |
170 | ||
171 | Double_t asparx = (mxpiu-mxmeno)/(mxpiu+mxmeno); | |
172 | Double_t aspary = (mypiu-mymeno)/(mypiu+mymeno); | |
173 | ||
174 | Double_t x0 = 2.86*asparx; | |
175 | Double_t y0 = 2.86*aspary; | |
176 | ||
177 | if(fDebug>0) cout << "Rough xy vertex = " << x0 << " " << y0 << endl; | |
178 | ||
179 | for(Int_t i=0;i<np1;i++) { | |
180 | x1[i]-=x0; | |
181 | y1[i]-=y0; | |
182 | PhiFunc(x1[i],y1[i],phi1[i]); | |
183 | r1[i]=TMath::Sqrt(x1[i]*x1[i]+y1[i]*y1[i]); | |
88cb7938 | 184 | } |
fe4280bf | 185 | for(Int_t i=0;i<np2;i++) { |
186 | x2[i]-=x0; | |
187 | y2[i]-=y0; | |
188 | PhiFunc(x2[i],y2[i],phi2[i]); | |
189 | r2[i]=TMath::Sqrt(x2[i]*x2[i]+y2[i]*y2[i]); | |
83028144 | 190 | } |
fe4280bf | 191 | |
192 | Int_t nbinxy=400; | |
193 | Int_t nbinz=400; | |
194 | TH1F *hxv=new TH1F("hxv","",nbinxy,-5,5); | |
195 | TH1F *hyv=new TH1F("hyv","",nbinxy,-5,5); | |
196 | TH1F *hzv=new TH1F("hzv","",nbinz,-15,15); | |
197 | ||
198 | Double_t dphi; | |
199 | for(Int_t j=0; j<np1; j++) { | |
200 | for(Int_t k=0; k<np2; k++) { | |
201 | dphi=TMath::Abs(phi2[k]-phi1[j]); | |
88cb7938 | 202 | if(dphi>180) dphi = 360-dphi; |
fe4280bf | 203 | if(dphi>fMaxDeltaPhi) continue; |
204 | hzv->Fill(z1[j]-(z2[k]-z1[j])/((r2[k]/r1[j])-1)); | |
205 | } | |
88cb7938 | 206 | } |
fe4280bf | 207 | |
208 | // Fitting ... | |
209 | Double_t max; | |
7d62fb64 | 210 | Int_t binMax; |
b5d712e2 | 211 | Double_t maxcenter; |
83028144 | 212 | |
fe4280bf | 213 | max = hzv->GetMaximum(); |
7d62fb64 | 214 | binMax=hzv->GetMaximumBin(); |
215 | maxcenter=hzv->GetBinCenter(binMax); | |
fe4280bf | 216 | Double_t dxy=1.5; |
83028144 | 217 | |
b5d712e2 | 218 | TF1 *fz = new TF1 ("fz","([0]*exp(-0.5*((x-[1])/[2])*((x-[1])/[2])))+[3]",maxcenter-dxy,maxcenter+dxy); |
fe4280bf | 219 | fz->SetParameter(0,max); |
b5d712e2 | 220 | fz->SetParameter(1,maxcenter); |
fe4280bf | 221 | fz->SetParameter(2,0.1); |
222 | fz->SetLineColor(kRed); | |
223 | hzv->Fit("fz","RQ0"); | |
224 | ||
225 | if(TMath::Abs(x0)>0.4 || TMath::Abs(y0)>0.4) { | |
226 | 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"); | |
227 | Double_t position[3]={0,0,fz->GetParameter(1)}; | |
228 | Double_t resolution[3]={0,0,0}; | |
229 | Double_t snr[3]={0,0,0}; | |
230 | Char_t name[30]; | |
231 | if(fDebug>0)Info("FindVertexForCurrentEvent","Vertex found for event %d",evnumber); | |
232 | sprintf(name,"Vertex"); | |
233 | fCurrentVertex = new AliESDVertex(position,resolution,snr,name); | |
83028144 | 234 | return fCurrentVertex; |
88cb7938 | 235 | } |
83028144 | 236 | |
fe4280bf | 237 | for(Int_t j=0; j<np1; j++) { |
238 | for(Int_t k=0; k<np2; k++) { | |
239 | if(TMath::Abs((z1[j]-(z2[k]-z1[j])/((r2[k]/r1[j])-1))-fz->GetParameter(1))>fMaxDeltaZ) continue; | |
240 | if(y2[k]==y1[j]) continue; | |
241 | hxv->Fill(x0+(x2[k]-((x2[k]-x1[j])/(y2[k]-y1[j]))*y2[k])); | |
242 | if(x2[k]==x1[j]) continue; | |
243 | hyv->Fill(y0+(y2[k]-((y2[k]-y1[j])/(x2[k]-x1[j]))*x2[k])); | |
88cb7938 | 244 | } |
245 | } | |
fe4280bf | 246 | |
247 | 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); | |
248 | fx->SetParameter(0,100); | |
249 | Double_t dist=0.3; | |
b5d712e2 | 250 | Double_t xapprox=FindMaxAround(x0,hxv,dist); |
251 | if(fDebug>0) cout << "xapprox = " << xapprox << endl; | |
252 | fx->SetParameter(1,xapprox); | |
253 | Double_t difcentroid=0.07; | |
254 | fx->SetParLimits(1,xapprox-difcentroid,xapprox+difcentroid); | |
fe4280bf | 255 | fx->SetParameter(2,0.1); |
256 | fx->SetLineColor(kRed); | |
257 | hxv->Fit("fx","RQW0"); | |
83028144 | 258 | |
fe4280bf | 259 | 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); |
260 | fy->SetParameter(0,100); | |
b5d712e2 | 261 | Double_t yapprox=FindMaxAround(y0,hyv,dist); |
262 | if(fDebug>0) cout << "yapprox = " << yapprox << endl; | |
263 | fy->SetParameter(1,yapprox); | |
264 | fy->SetParLimits(1,yapprox-difcentroid,yapprox+difcentroid); | |
fe4280bf | 265 | fy->SetParameter(2,0.1); |
266 | fy->SetLineColor(kRed); | |
267 | hyv->Fit("fy","RQW0"); | |
83028144 | 268 | |
83028144 | 269 | delete [] z1; |
270 | delete [] z2; | |
271 | delete [] y1; | |
272 | delete [] y2; | |
273 | delete [] x1; | |
274 | delete [] x2; | |
88cb7938 | 275 | delete [] r1; |
276 | delete [] r2; | |
277 | delete [] phi1; | |
278 | delete [] phi2; | |
fe4280bf | 279 | delete hxv; |
280 | delete hyv; | |
281 | delete hzv; | |
282 | ||
283 | Double_t position[3]={fx->GetParameter(1),fy->GetParameter(1),fz->GetParameter(1)}; | |
284 | Double_t resolution[3]={fx->GetParameter(2),fy->GetParameter(2),fz->GetParameter(2)}; | |
285 | Double_t snr[3]={0,0,0}; | |
286 | ||
88cb7938 | 287 | Char_t name[30]; |
088e0b8d | 288 | if(fDebug>0)Info("FindVertexForCurrentEvent","Vertex found for event %d",evnumber); |
88cb7938 | 289 | sprintf(name,"Vertex"); |
d681bb2d | 290 | fCurrentVertex = new AliESDVertex(position,resolution,snr,name); |
7d62fb64 | 291 | |
88cb7938 | 292 | return fCurrentVertex; |
c5f0f3c1 | 293 | } |
294 | ||
295 | //______________________________________________________________________ | |
fe4280bf | 296 | void AliITSVertexerIons::PhiFunc(Double_t &x,Double_t &y,Double_t &phi) { |
b5d712e2 | 297 | // Method for the computation of the phi angle given x and y. The result is in degrees. |
fe4280bf | 298 | if(y>0 && x>0) phi=(TMath::ATan((Double_t)(y/x))*57.29578); |
299 | if(y>0 && x<0) phi=(TMath::ATan((Double_t)(y/x))*57.29578)+180; | |
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)+360;; | |
c5f0f3c1 | 302 | } |
303 | ||
304 | //______________________________________________________________________ | |
305 | void AliITSVertexerIons::FindVertices(){ | |
306 | // computes the vertices of the events in the range FirstEvent - LastEvent | |
88cb7938 | 307 | AliRunLoader *rl = AliRunLoader::GetRunLoader(); |
83028144 | 308 | AliITSLoader* itsloader = (AliITSLoader*) rl->GetLoader("ITSLoader"); |
309 | itsloader->LoadRecPoints("read"); | |
ab6a6f40 | 310 | for(Int_t i=fFirstEvent;i<=fLastEvent;i++){ |
88cb7938 | 311 | rl->GetEvent(i); |
c5f0f3c1 | 312 | FindVertexForCurrentEvent(i); |
313 | if(fCurrentVertex){ | |
314 | WriteCurrentVertex(); | |
315 | } | |
316 | else { | |
317 | if(fDebug>0){ | |
318 | cout<<"Vertex not found for event "<<i<<endl; | |
319 | } | |
320 | } | |
321 | } | |
c5f0f3c1 | 322 | } |
323 | ||
324 | //________________________________________________________ | |
325 | void AliITSVertexerIons::PrintStatus() const { | |
326 | // Print current status | |
88cb7938 | 327 | cout <<"=======================================================\n"; |
328 | cout <<" Debug flag: "<<fDebug<<endl; | |
c5f0f3c1 | 329 | cout<<"First event to be processed "<<fFirstEvent; |
330 | cout<<"\n Last event to be processed "<<fLastEvent<<endl; | |
331 | if(fCurrentVertex)fCurrentVertex->PrintStatus(); | |
332 | } | |
fe4280bf | 333 | |
334 | //________________________________________________________ | |
335 | Double_t AliITSVertexerIons::FindMaxAround(Double_t point, TH1F *h, Double_t distance) { | |
b5d712e2 | 336 | // It finds the maximum of h within point-distance and distance+point. |
337 | Int_t maxcontent=0; | |
338 | Int_t maxbin=0; | |
fe4280bf | 339 | for(Int_t i=0;i<h->GetNbinsX();i++) { |
340 | Int_t content=(Int_t)h->GetBinContent(i); | |
341 | Double_t center=(Double_t)h->GetBinCenter(i); | |
1360bc6f | 342 | if(TMath::Abs(center-point)>distance) continue; |
b5d712e2 | 343 | if(content>maxcontent) {maxcontent=content;maxbin=i;} |
fe4280bf | 344 | } |
b5d712e2 | 345 | Double_t max=h->GetBinCenter(maxbin); |
fe4280bf | 346 | return max; |
347 | } | |
348 | ||
349 |