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