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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 | //______________________________________________________________________ |
88cb7938 | 32 | AliITSVertexerIons::AliITSVertexerIons():AliITSVertexer() { |
c5f0f3c1 | 33 | // Default Constructor |
34 | ||
7d62fb64 | 35 | //fITS = 0; |
83028144 | 36 | SetNpThreshold(); |
fe4280bf | 37 | SetMaxDeltaPhi(); |
38 | SetMaxDeltaZ(); | |
c5f0f3c1 | 39 | } |
40 | ||
41 | //______________________________________________________________________ | |
88cb7938 | 42 | AliITSVertexerIons::AliITSVertexerIons(TString fn):AliITSVertexer(fn) { |
c5f0f3c1 | 43 | // Standard constructor |
88cb7938 | 44 | |
7d62fb64 | 45 | //fITS = 0; |
83028144 | 46 | SetNpThreshold(); |
fe4280bf | 47 | SetMaxDeltaPhi(); |
b5d712e2 | 48 | SetMaxDeltaZ(); |
49 | } | |
50 | ||
51 | //______________________________________________________________________ | |
52 | AliITSVertexerIons::AliITSVertexerIons(const AliITSVertexerIons &source):AliITSVertexer(source) { | |
53 | // Copy constructor | |
54 | // Copies are not allowed. The method is protected to avoid misuse. | |
55 | Error("AliITSVertexerIons","Copy constructor not allowed\n"); | |
56 | } | |
57 | ||
58 | //_________________________________________________________________________ | |
59 | AliITSVertexerIons& AliITSVertexerIons::operator=(const AliITSVertexerIons &/*source*/) { | |
60 | // Assignment operator | |
61 | // Assignment is not allowed. The method is protected to avoid misuse. | |
62 | Error("= operator","Assignment operator not allowed\n"); | |
63 | return *this; | |
64 | } | |
c5f0f3c1 | 65 | |
66 | ||
67 | //______________________________________________________________________ | |
68 | AliITSVertexerIons::~AliITSVertexerIons() { | |
69 | // Default Destructor | |
7d62fb64 | 70 | //fITS = 0; |
c5f0f3c1 | 71 | } |
72 | ||
73 | //______________________________________________________________________ | |
b5d712e2 | 74 | AliESDVertex* AliITSVertexerIons::FindVertexForCurrentEvent(Int_t evnumber){ |
75 | // Defines the AliESDVertex for the current event | |
fe4280bf | 76 | |
c5f0f3c1 | 77 | fCurrentVertex = 0; |
fe4280bf | 78 | |
88cb7938 | 79 | AliRunLoader *rl = AliRunLoader::GetRunLoader(); |
7d62fb64 | 80 | AliITSLoader* itsloader = (AliITSLoader*)rl->GetLoader("ITSLoader"); |
81 | TDirectory * olddir = gDirectory; | |
82 | rl->CdGAFile(); | |
83 | AliITSgeom* g2 = (AliITSgeom*)gDirectory->Get("AliITSgeom"); | |
84 | olddir->cd(); | |
85 | ||
fe4280bf | 86 | TTree *tr = itsloader->TreeR(); |
7d62fb64 | 87 | AliITSDetTypeRec detTypeRec; |
88 | ||
89 | detTypeRec.SetTreeAddressR(tr); | |
90 | ||
91 | TClonesArray *recpoints = detTypeRec.RecPoints(); | |
92 | AliITSRecPoint *pnt; | |
93 | ||
88cb7938 | 94 | |
fe4280bf | 95 | Int_t npoints=0; |
96 | Int_t nopoints1=40000; | |
97 | Int_t nopoints2=40000; | |
88cb7938 | 98 | Float_t l[3], p[3]; |
c5f0f3c1 | 99 | |
83028144 | 100 | Double_t *z1, *z2, *y1, *y2, *x1, *x2, *phi1, *phi2, *r1, *r2; |
101 | z1=new Double_t[nopoints1]; | |
102 | z2=new Double_t[nopoints2]; | |
103 | y1=new Double_t[nopoints1]; | |
104 | y2=new Double_t[nopoints2]; | |
105 | x1=new Double_t[nopoints1]; | |
106 | x2=new Double_t[nopoints2]; | |
107 | phi1=new Double_t[nopoints1]; | |
108 | phi2=new Double_t[nopoints2]; | |
109 | r1=new Double_t[nopoints1]; | |
110 | r2=new Double_t[nopoints2]; | |
c5f0f3c1 | 111 | |
fe4280bf | 112 | Double_t mxpiu = 0; |
113 | Double_t mxmeno = 0; | |
114 | Double_t mypiu = 0; | |
115 | Double_t mymeno = 0; | |
116 | Double_t r=0; | |
117 | ||
118 | Int_t np1=0, np2=0; | |
119 | for(Int_t i=g2->GetStartSPD();i<=g2->GetLastSPD();i++) { | |
7d62fb64 | 120 | detTypeRec.ResetRecPoints(); |
fe4280bf | 121 | tr->GetEvent(i); |
122 | npoints = recpoints->GetEntries(); | |
123 | for (Int_t ipoint=0;ipoint<npoints;ipoint++) { | |
124 | pnt = (AliITSRecPoint*)recpoints->UncheckedAt(ipoint); | |
00a7cc50 | 125 | l[0]=pnt->GetDetLocalX(); |
fe4280bf | 126 | l[1]=0; |
00a7cc50 | 127 | l[2]=pnt->GetDetLocalZ(); |
fe4280bf | 128 | g2->LtoG(i, l, p); |
129 | r=TMath::Sqrt(TMath::Power(p[0],2)+TMath::Power(p[1],2)); | |
130 | ||
131 | if(i<80 && TMath::Abs(p[2])<14.35) { | |
132 | y1[np1]=p[1]; | |
133 | x1[np1]=p[0]; | |
134 | z1[np1]=p[2]; | |
135 | if(p[0]>0) mxpiu++; | |
136 | if(p[0]<0) mxmeno++; | |
137 | if(p[1]>0) mypiu++; | |
138 | if(p[1]<0) mymeno++; | |
139 | np1++; | |
2257f27e | 140 | } |
fe4280bf | 141 | if(i>=80 && TMath::Abs(p[2])<14.35) { |
142 | y2[np2]=p[1]; | |
143 | x2[np2]=p[0]; | |
144 | z2[np2]=p[2]; | |
145 | np2++; | |
88cb7938 | 146 | } |
147 | } | |
fe4280bf | 148 | } |
c5f0f3c1 | 149 | |
83028144 | 150 | if(np1<fNpThreshold) { |
83028144 | 151 | Warning("FindVertexForCurrentEvent","AliITSVertexerIons finder is not reliable for low multiplicity events. Switching to AliITSVertexerPPZ with default parameters...\n"); |
152 | Warning("FindVertexForCurrentEvent","N rec points = %d - Threshold is %d",np1,fNpThreshold); | |
fe4280bf | 153 | AliITSVertexerPPZ *dovert = new AliITSVertexerPPZ("default"); |
83028144 | 154 | fCurrentVertex =dovert->FindVertexForCurrentEvent(rl->GetEventNumber()); |
155 | delete dovert; | |
156 | return fCurrentVertex; | |
157 | } | |
158 | ||
fe4280bf | 159 | if(!np1 || !np2) { |
160 | Error("FindVertexForCurrentEvent","No points in the pixer layers"); | |
83028144 | 161 | return fCurrentVertex; |
fe4280bf | 162 | } |
163 | if(fDebug>0) cout << "N. points layer 1 and 2 : " << np1 << " " << np2 << endl; | |
164 | ||
165 | Double_t asparx = (mxpiu-mxmeno)/(mxpiu+mxmeno); | |
166 | Double_t aspary = (mypiu-mymeno)/(mypiu+mymeno); | |
167 | ||
168 | Double_t x0 = 2.86*asparx; | |
169 | Double_t y0 = 2.86*aspary; | |
170 | ||
171 | if(fDebug>0) cout << "Rough xy vertex = " << x0 << " " << y0 << endl; | |
172 | ||
173 | for(Int_t i=0;i<np1;i++) { | |
174 | x1[i]-=x0; | |
175 | y1[i]-=y0; | |
176 | PhiFunc(x1[i],y1[i],phi1[i]); | |
177 | r1[i]=TMath::Sqrt(x1[i]*x1[i]+y1[i]*y1[i]); | |
88cb7938 | 178 | } |
fe4280bf | 179 | for(Int_t i=0;i<np2;i++) { |
180 | x2[i]-=x0; | |
181 | y2[i]-=y0; | |
182 | PhiFunc(x2[i],y2[i],phi2[i]); | |
183 | r2[i]=TMath::Sqrt(x2[i]*x2[i]+y2[i]*y2[i]); | |
83028144 | 184 | } |
fe4280bf | 185 | |
186 | Int_t nbinxy=400; | |
187 | Int_t nbinz=400; | |
188 | TH1F *hxv=new TH1F("hxv","",nbinxy,-5,5); | |
189 | TH1F *hyv=new TH1F("hyv","",nbinxy,-5,5); | |
190 | TH1F *hzv=new TH1F("hzv","",nbinz,-15,15); | |
191 | ||
192 | Double_t dphi; | |
193 | for(Int_t j=0; j<np1; j++) { | |
194 | for(Int_t k=0; k<np2; k++) { | |
195 | dphi=TMath::Abs(phi2[k]-phi1[j]); | |
88cb7938 | 196 | if(dphi>180) dphi = 360-dphi; |
fe4280bf | 197 | if(dphi>fMaxDeltaPhi) continue; |
198 | hzv->Fill(z1[j]-(z2[k]-z1[j])/((r2[k]/r1[j])-1)); | |
199 | } | |
88cb7938 | 200 | } |
fe4280bf | 201 | |
202 | // Fitting ... | |
203 | Double_t max; | |
7d62fb64 | 204 | Int_t binMax; |
b5d712e2 | 205 | Double_t maxcenter; |
83028144 | 206 | |
fe4280bf | 207 | max = hzv->GetMaximum(); |
7d62fb64 | 208 | binMax=hzv->GetMaximumBin(); |
209 | maxcenter=hzv->GetBinCenter(binMax); | |
fe4280bf | 210 | Double_t dxy=1.5; |
83028144 | 211 | |
b5d712e2 | 212 | TF1 *fz = new TF1 ("fz","([0]*exp(-0.5*((x-[1])/[2])*((x-[1])/[2])))+[3]",maxcenter-dxy,maxcenter+dxy); |
fe4280bf | 213 | fz->SetParameter(0,max); |
b5d712e2 | 214 | fz->SetParameter(1,maxcenter); |
fe4280bf | 215 | fz->SetParameter(2,0.1); |
216 | fz->SetLineColor(kRed); | |
217 | hzv->Fit("fz","RQ0"); | |
218 | ||
219 | if(TMath::Abs(x0)>0.4 || TMath::Abs(y0)>0.4) { | |
220 | 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"); | |
221 | Double_t position[3]={0,0,fz->GetParameter(1)}; | |
222 | Double_t resolution[3]={0,0,0}; | |
223 | Double_t snr[3]={0,0,0}; | |
224 | Char_t name[30]; | |
225 | if(fDebug>0)Info("FindVertexForCurrentEvent","Vertex found for event %d",evnumber); | |
226 | sprintf(name,"Vertex"); | |
227 | fCurrentVertex = new AliESDVertex(position,resolution,snr,name); | |
83028144 | 228 | return fCurrentVertex; |
88cb7938 | 229 | } |
83028144 | 230 | |
fe4280bf | 231 | for(Int_t j=0; j<np1; j++) { |
232 | for(Int_t k=0; k<np2; k++) { | |
233 | if(TMath::Abs((z1[j]-(z2[k]-z1[j])/((r2[k]/r1[j])-1))-fz->GetParameter(1))>fMaxDeltaZ) continue; | |
234 | if(y2[k]==y1[j]) continue; | |
235 | hxv->Fill(x0+(x2[k]-((x2[k]-x1[j])/(y2[k]-y1[j]))*y2[k])); | |
236 | if(x2[k]==x1[j]) continue; | |
237 | hyv->Fill(y0+(y2[k]-((y2[k]-y1[j])/(x2[k]-x1[j]))*x2[k])); | |
88cb7938 | 238 | } |
239 | } | |
fe4280bf | 240 | |
241 | 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); | |
242 | fx->SetParameter(0,100); | |
243 | Double_t dist=0.3; | |
b5d712e2 | 244 | Double_t xapprox=FindMaxAround(x0,hxv,dist); |
245 | if(fDebug>0) cout << "xapprox = " << xapprox << endl; | |
246 | fx->SetParameter(1,xapprox); | |
247 | Double_t difcentroid=0.07; | |
248 | fx->SetParLimits(1,xapprox-difcentroid,xapprox+difcentroid); | |
fe4280bf | 249 | fx->SetParameter(2,0.1); |
250 | fx->SetLineColor(kRed); | |
251 | hxv->Fit("fx","RQW0"); | |
83028144 | 252 | |
fe4280bf | 253 | 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); |
254 | fy->SetParameter(0,100); | |
b5d712e2 | 255 | Double_t yapprox=FindMaxAround(y0,hyv,dist); |
256 | if(fDebug>0) cout << "yapprox = " << yapprox << endl; | |
257 | fy->SetParameter(1,yapprox); | |
258 | fy->SetParLimits(1,yapprox-difcentroid,yapprox+difcentroid); | |
fe4280bf | 259 | fy->SetParameter(2,0.1); |
260 | fy->SetLineColor(kRed); | |
261 | hyv->Fit("fy","RQW0"); | |
83028144 | 262 | |
83028144 | 263 | delete [] z1; |
264 | delete [] z2; | |
265 | delete [] y1; | |
266 | delete [] y2; | |
267 | delete [] x1; | |
268 | delete [] x2; | |
88cb7938 | 269 | delete [] r1; |
270 | delete [] r2; | |
271 | delete [] phi1; | |
272 | delete [] phi2; | |
fe4280bf | 273 | delete hxv; |
274 | delete hyv; | |
275 | delete hzv; | |
276 | ||
277 | Double_t position[3]={fx->GetParameter(1),fy->GetParameter(1),fz->GetParameter(1)}; | |
278 | Double_t resolution[3]={fx->GetParameter(2),fy->GetParameter(2),fz->GetParameter(2)}; | |
279 | Double_t snr[3]={0,0,0}; | |
280 | ||
88cb7938 | 281 | Char_t name[30]; |
088e0b8d | 282 | if(fDebug>0)Info("FindVertexForCurrentEvent","Vertex found for event %d",evnumber); |
88cb7938 | 283 | sprintf(name,"Vertex"); |
d681bb2d | 284 | fCurrentVertex = new AliESDVertex(position,resolution,snr,name); |
7d62fb64 | 285 | |
88cb7938 | 286 | return fCurrentVertex; |
c5f0f3c1 | 287 | } |
288 | ||
289 | //______________________________________________________________________ | |
fe4280bf | 290 | void AliITSVertexerIons::PhiFunc(Double_t &x,Double_t &y,Double_t &phi) { |
b5d712e2 | 291 | // Method for the computation of the phi angle given x and y. The result is in degrees. |
fe4280bf | 292 | if(y>0 && x>0) phi=(TMath::ATan((Double_t)(y/x))*57.29578); |
293 | if(y>0 && x<0) phi=(TMath::ATan((Double_t)(y/x))*57.29578)+180; | |
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)+360;; | |
c5f0f3c1 | 296 | } |
297 | ||
298 | //______________________________________________________________________ | |
299 | void AliITSVertexerIons::FindVertices(){ | |
300 | // computes the vertices of the events in the range FirstEvent - LastEvent | |
88cb7938 | 301 | AliRunLoader *rl = AliRunLoader::GetRunLoader(); |
83028144 | 302 | AliITSLoader* itsloader = (AliITSLoader*) rl->GetLoader("ITSLoader"); |
303 | itsloader->LoadRecPoints("read"); | |
ab6a6f40 | 304 | for(Int_t i=fFirstEvent;i<=fLastEvent;i++){ |
88cb7938 | 305 | rl->GetEvent(i); |
c5f0f3c1 | 306 | FindVertexForCurrentEvent(i); |
307 | if(fCurrentVertex){ | |
308 | WriteCurrentVertex(); | |
309 | } | |
310 | else { | |
311 | if(fDebug>0){ | |
312 | cout<<"Vertex not found for event "<<i<<endl; | |
313 | } | |
314 | } | |
315 | } | |
c5f0f3c1 | 316 | } |
317 | ||
318 | //________________________________________________________ | |
319 | void AliITSVertexerIons::PrintStatus() const { | |
320 | // Print current status | |
88cb7938 | 321 | cout <<"=======================================================\n"; |
322 | cout <<" Debug flag: "<<fDebug<<endl; | |
c5f0f3c1 | 323 | cout<<"First event to be processed "<<fFirstEvent; |
324 | cout<<"\n Last event to be processed "<<fLastEvent<<endl; | |
325 | if(fCurrentVertex)fCurrentVertex->PrintStatus(); | |
326 | } | |
fe4280bf | 327 | |
328 | //________________________________________________________ | |
329 | Double_t AliITSVertexerIons::FindMaxAround(Double_t point, TH1F *h, Double_t distance) { | |
b5d712e2 | 330 | // It finds the maximum of h within point-distance and distance+point. |
331 | Int_t maxcontent=0; | |
332 | Int_t maxbin=0; | |
fe4280bf | 333 | for(Int_t i=0;i<h->GetNbinsX();i++) { |
334 | Int_t content=(Int_t)h->GetBinContent(i); | |
335 | Double_t center=(Double_t)h->GetBinCenter(i); | |
1360bc6f | 336 | if(TMath::Abs(center-point)>distance) continue; |
b5d712e2 | 337 | if(content>maxcontent) {maxcontent=content;maxbin=i;} |
fe4280bf | 338 | } |
b5d712e2 | 339 | Double_t max=h->GetBinCenter(maxbin); |
fe4280bf | 340 | return max; |
341 | } | |
342 | ||
343 |