Macros moved from oldmacros on the standard ITS directory
[u/mrichter/AliRoot.git] / ITS / AliV0Comparison.C
CommitLineData
ca28c5f5 1/****************************************************************************
2 * Very important, delicate and rather obscure macro. *
3 * *
4 * Creates list of "findable" V0s, *
5 * calculates efficiency, resolutions etc. *
6 * *
7 * Origin: I.Belikov, IReS, Strasbourg, Jouri.Belikov@cern.ch *
8 ****************************************************************************/
9
10#ifndef __CINT__
11 #include <iostream.h>
12 #include <fstream.h>
13
14 #include "TH1.h"
15 #include "TFile.h"
16 #include "TTree.h"
17 #include "TObjArray.h"
18 #include "TStyle.h"
19 #include "TCanvas.h"
20 #include "TLine.h"
21 #include "TText.h"
22 #include "TParticle.h"
23 #include "TStopwatch.h"
24
25 #include "AliRun.h"
26 #include "AliPDG.h"
27 #include "AliV0vertex.h"
28#endif
29
30struct GoodVertex {
31 Int_t nlab,plab;
32 Int_t code;
33 Float_t px,py,pz;
34 Float_t x,y,z;
35};
36Int_t good_vertices(GoodVertex *gt, Int_t max);
37
38Int_t AliV0Comparison(Int_t code=310) { //Lambda=3122, LambdaBar=-3122
39 cerr<<"Doing comparison...\n";
40
41 const Double_t V0window=0.05, V0width=0.015;
42 Double_t V0mass=0.5;
43 switch (code) {
44 case kK0Short: V0mass=0.497672; break;
45 case kLambda0: V0mass=1.115683; break;
46 case kLambda0Bar: V0mass=1.115683; break;
47 default: cerr<<"Invalid PDG code !\n"; return 1;
48 }
49
50 TStopwatch timer;
51
52 /*** Load reconstructed vertices ***/
53 TFile *vf=TFile::Open("AliV0vertices.root");
54 if (!vf->IsOpen()) {cerr<<"Can't open AliV0vertices.root !\n"; return 2;}
55 TObjArray varray(1000);
56 TTree *vTree=(TTree*)vf->Get("TreeV");
57 TBranch *branch=vTree->GetBranch("vertices");
58 Int_t nentr=(Int_t)vTree->GetEntries();
59 for (Int_t i=0; i<nentr; i++) {
60 AliV0vertex *iovertex=new AliV0vertex; branch->SetAddress(&iovertex);
61 vTree->GetEvent(i);
62 varray.AddLast(iovertex);
63 }
64
65 /*** Check if the file with the "good" vertices exists ***/
66 GoodVertex gv[1000];
67 Int_t ngood=0;
68 ifstream in("good_vertices");
69 if (in) {
70 cerr<<"Reading good vertices...\n";
71 while (in>>gv[ngood].nlab>>gv[ngood].plab>>gv[ngood].code>>
72 gv[ngood].px>>gv[ngood].py>>gv[ngood].pz>>
73 gv[ngood].x >>gv[ngood].y >>gv[ngood].z) {
74 ngood++;
75 cerr<<ngood<<'\r';
76 if (ngood==1000) {
77 cerr<<"Too many good vertices !\n";
78 break;
79 }
80 }
81 if (!in.eof()) cerr<<"Read error (good_vertices) !\n";
82 } else {
83 /*** generate a file with the "good" vertices ***/
84 cerr<<"Marking good vertices (this will take a while)...\n";
85 ngood=good_vertices(gv,1000);
86 ofstream out("good_vertices");
87 if (out) {
88 for (Int_t ngd=0; ngd<ngood; ngd++)
89 out<<gv[ngd].nlab<<' '<<gv[ngd].plab<<' '<<gv[ngd].code<<' '<<
90 gv[ngd].px<<' '<<gv[ngd].py<<' '<<gv[ngd].pz<<' '<<
91 gv[ngd].x <<' '<<gv[ngd].y <<' '<<gv[ngd].z <<endl;
92 } else cerr<<"Can not open file (good_vertices) !\n";
93 out.close();
94 }
95
96 vf->Close();
97
98
99 TH1F *hp=new TH1F("hp","Angular Resolution",30,-30.,30.); //phi resolution
100 hp->SetXTitle("(mrad)"); hp->SetFillColor(2);
101 TH1F *hl=new TH1F("hl","Lambda Resolution",30,-30,30);
102 hl->SetXTitle("(mrad)"); hl->SetFillColor(1); hl->SetFillStyle(3013);
103 TH1F *hpt=new TH1F("hpt","Relative Pt Resolution",30,-10.,10.);
104 hpt->SetXTitle("(%)"); hpt->SetFillColor(2);
105
106 TH1F *hx=new TH1F("hx","Position Resolution (X,Y)",30,-3.,3.); //x res.
107 hx->SetXTitle("(mm)"); hx->SetFillColor(6);
108 TH1F *hy=new TH1F("hy","Position Resolution (Y)",30,-3.,3.); //y res
109 hy->SetXTitle("(mm)"); hy->SetFillColor(1); hy->SetFillStyle(3013);
110 TH1F *hz=new TH1F("hz","Position Resolution (Z)",30,-3.,3.); //z res.
111 hz->SetXTitle("(mm)"); hz->SetFillColor(6);
112
113
114 Double_t pmin=0.2, pmax=4.2; Int_t nchan=20;
115 TH1F *hgood=new TH1F("hgood","Good Vertices",nchan,pmin,pmax);
116 TH1F *hfound=new TH1F("hfound","Found Vertices",nchan,pmin,pmax);
117 TH1F *hfake=new TH1F("hfake","Fake Vertices",nchan,pmin,pmax);
118 TH1F *hg=new TH1F("hg","Efficiency for Good Vertices",nchan,pmin,pmax);
119 hg->SetLineColor(4); hg->SetLineWidth(2);
120 TH1F *hf=new TH1F("hf","Probability of Fake Vertices",nchan,pmin,pmax);
121 hf->SetFillColor(1); hf->SetFillStyle(3013); hf->SetLineWidth(2);
122
123 Double_t mmin=V0mass-V0window, mmax=V0mass+V0window;
124 TH1F *v0s =new TH1F("v0s","V0s Effective Mass",40, mmin, mmax);
125 v0s->SetXTitle("(GeV)"); v0s->SetFillColor(6);
126
127
128 Double_t pxg=0.,pyg=0.,ptg=0.;
129 Int_t nlab=-1, plab=-1;
130 Int_t i;
131 for (i=0; i<nentr; i++) {
132 AliV0vertex *vertex=(AliV0vertex*)varray.UncheckedAt(i);
133 nlab=TMath::Abs(vertex->GetNlabel());
134 plab=TMath::Abs(vertex->GetPlabel());
135
136 vertex->ChangeMassHypothesis(code);
137
138 Double_t mass=vertex->GetEffMass();
139 v0s->Fill(mass);
140
141 Int_t j;
142 for (j=0; j<ngood; j++) {
143 if (gv[j].code != vertex->GetPdgCode()) continue;
144 if (gv[j].nlab == nlab)
145 if (gv[j].plab == plab) break;
146 }
147
148 if (TMath::Abs(mass-V0mass)>V0width) continue;
149
150 Double_t px,py,pz; vertex->GetPxPyPz(px,py,pz);
151 Double_t pt=TMath::Sqrt(px*px+py*py);
152
153 if (j==ngood) {
154 hfake->Fill(pt);
155 cerr<<"Fake vertex: ("<<nlab<<","<<plab<<")\n";
156 continue;
157 }
158
159 pxg=gv[j].px; pyg=gv[j].py; ptg=TMath::Sqrt(pxg*pxg+pyg*pyg);
160 Double_t phig=TMath::ATan2(pyg,pxg), phi=TMath::ATan2(py,px);
161 Double_t lamg=TMath::ATan2(gv[j].pz,ptg), lam=TMath::ATan2(pz,pt);
162 hp->Fill((phi - phig)*1000.);
163 hl->Fill((lam - lamg)*1000.);
164 hpt->Fill((1/pt - 1/ptg)/(1/ptg)*100.);
165
166 Double_t x,y,z; vertex->GetXYZ(x,y,z);
167 hx->Fill((x-gv[j].x)*10);
168 hy->Fill((y-gv[j].y)*10);
169 hz->Fill((z-gv[j].z)*10);
170
171 hfound->Fill(ptg);
172 gv[j].nlab=-1;
173
174 }
175 for (i=0; i<ngood; i++) {
176 if (gv[i].code != code) continue;
177 pxg=gv[i].px; pyg=gv[i].py; ptg=TMath::Sqrt(pxg*pxg+pyg*pyg);
178 hgood->Fill(ptg);
179 nlab=gv[i].nlab; plab=gv[i].plab;
180 if (nlab < 0) continue;
181 cerr<<"Vertex ("<<nlab<<','<<plab<<") has not been found !\n";
182 }
183
184 varray.Delete();
185
186 Stat_t ng=hgood->GetEntries();
187 Stat_t nf=hfound->GetEntries();
188
189 cerr<<"Number of found vertices: "<<nentr<<" ("<<nf<<" in the peak)\n";
190 cerr<<"Number of good vertices: "<<ng<<endl;
191
192 if (ng!=0)
193 cerr<<"Integral efficiency is about "<<nf/ng*100.<<" %\n";
194
195 gStyle->SetOptStat(111110);
196 gStyle->SetOptFit(1);
197
198 TCanvas *c1=new TCanvas("c1","",0,0,580,610);
199 c1->Divide(2,2);
200
201 c1->cd(1);
202 gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
203 //hp->Fit("gaus");
204 hp->Draw();
205 hl->Draw("same"); c1->cd();
206
207 c1->cd(2);
208 gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
209 //hpt->Fit("gaus"); c1->cd();
210 hpt->Draw(); c1->cd();
211
212 c1->cd(3);
213 gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
214 //hx->Fit("gaus");
215 hx->Draw();
216 hy->Draw("same"); c1->cd();
217
218 c1->cd(4);
219 gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
220 //hz->Fit("gaus");
221 hz->Draw();
222
223
224 TCanvas *c2=new TCanvas("c2","",600,0,580,610);
225 c2->Divide(1,2);
226
227 c2->cd(1);
228 gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
229 hfound->Sumw2(); hgood->Sumw2(); hfake->Sumw2();
230 hg->Divide(hfound,hgood,1,1.,"b");
231 hf->Divide(hfake,hgood,1,1.,"b");
232 hg->SetMaximum(1.4);
233 hg->SetYTitle("V0 reconstruction efficiency");
234 hg->SetXTitle("Pt (GeV/c)");
235 hg->Draw();
236
237 TLine *line1 = new TLine(pmin,1.0,pmax,1.0); line1->SetLineStyle(4);
238 line1->Draw("same");
239 TLine *line2 = new TLine(pmin,0.9,pmax,0.9); line2->SetLineStyle(4);
240 line2->Draw("same");
241
242 hf->SetFillColor(1);
243 hf->SetFillStyle(3013);
244 hf->SetLineColor(2);
245 hf->SetLineWidth(2);
246 hf->Draw("histsame");
247 TText *text = new TText(0.461176,0.248448,"Fake vertices");
248 text->SetTextSize(0.05);
249 text->Draw();
250 text = new TText(0.453919,1.11408,"Good vertices");
251 text->SetTextSize(0.05);
252 text->Draw();
253
254
255 c2->cd(2);
256 gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
257 v0s->SetXTitle("(GeV/c)");
258 v0s->Fit("gaus","","",V0mass-V0width,V0mass+V0width);
259 Double_t max=v0s->GetMaximum();
260 TLine *line3 = new TLine(V0mass-V0width,0.,V0mass-V0width,max);
261 line3->Draw("same");
262 TLine *line4 = new TLine(V0mass+V0width,0.,V0mass+V0width,max);
263 line4->Draw("same");
264
265 timer.Stop(); timer.Print();
266
267 return 0;
268}
269
270Int_t good_vertices(GoodVertex *gv, Int_t max) {
271 Int_t nv=0;
272 /*** Get information about the cuts ***/
273 Double_t r2min=0.9*0.9;
274 Double_t r2max=2.9*2.9;
275
276 /*** Get labels of the "good" tracks ***/
277 Double_t dd; Int_t id, label[15000], ngt=0;
278 ifstream in("good_tracks_its");
279 if (!in) {
280 cerr<<"Can't open the file good_tracks_its \n";
281 return nv;
282 }
283 while (in>>label[ngt]>>id>>dd>>dd>>dd>>dd>>dd>>dd) {
284 ngt++;
285 if (ngt>=15000) {
286 cerr<<"Too many good ITS tracks !\n";
287 return nv;
288 }
289 }
290 if (!in.eof()) {
291 cerr<<"Read error (good_tracks_its) !\n";
292 return nv;
293 }
294
295 /*** Get an access to the kinematics ***/
296 if (gAlice) {delete gAlice; gAlice=0;}
297
298 TFile *file=TFile::Open("galice.root");
299 if (!file->IsOpen()) {cerr<<"Can't open galice.root !\n"; exit(4);}
300 if (!(gAlice=(AliRun*)file->Get("gAlice"))) {
301 cerr<<"gAlice has not been found on galice.root !\n";
302 exit(5);
303 }
304
305 Int_t np=gAlice->GetEvent(0);
306 while (np--) {
307 cerr<<np<<'\r';
308 TParticle *p0=gAlice->Particle(np);
309
310 /*** only these V0s are "good" ***/
311 Int_t code=p0->GetPdgCode();
312 if (code!=kK0Short)
313 if (code!=kLambda0)
314 if (code!=kLambda0Bar) continue;
315
316 /*** daughter tracks should be "good" ***/
317 Int_t plab=p0->GetFirstDaughter(), nlab=p0->GetLastDaughter();
318 if (nlab==plab) continue;
319 if (nlab<0) continue;
320 if (plab<0) continue;
321 Int_t i;
322 for (i=0; i<ngt; i++) if (label[i]==nlab) break;
323 if (i==ngt) continue;
324 for (i=0; i<ngt; i++) if (label[i]==plab) break;
325 if (i==ngt) continue;
326
327 /*** fiducial volume ***/
328 TParticle *p=gAlice->Particle(nlab);
329 Double_t x=p->Vx(), y=p->Vy(), z=p->Vz(), r2=x*x+y*y;
330 if (r2<r2min) continue;
331 if (r2>r2max) continue;
332
333 if (gAlice->Particle(plab)->GetPDG()->Charge() < 0.) {
334 i=plab; plab=nlab; nlab=i;
335 }
336
337 gv[nv].code=code;
338 gv[nv].plab=plab; gv[nv].nlab=nlab;
339 gv[nv].px=p0->Px(); gv[nv].py=p0->Py(); gv[nv].pz=p0->Pz();
340 gv[nv].x=x; gv[nv].y=y; gv[nv].z=z;
341 nv++;
342 }
343
344 delete gAlice; gAlice=0;
345
346 file->Close();
347
348 return nv;
349}