[u/mrichter/AliRoot.git] / ITS / AliCascadeComparison.C

/****************************************************************************
 *           Very important, delicate and rather obscure macro.             *
 *                                                                          *
 *               Creates list of "findable" cascades,                       *
 *             calculates efficiency, resolutions etc.                      *
 *                                                                          *
 *  Origin: Christian Kuhn, IReS, Strasbourg, christian.kuhn@ires.in2p3.fr  *
 ****************************************************************************/

#ifndef __CINT__
  #include <iostream.h>
  #include <fstream.h>

  #include "TH1.h"
  #include "TFile.h"
  #include "TTree.h"
  #include "TObjArray.h"
  #include "TStyle.h"
  #include "TCanvas.h"
  #include "TLine.h"
  #include "TText.h"
  #include "TParticle.h"
  #include "TStopwatch.h"

  #include "AliRun.h"
  #include "AliPDG.h"
  #include "AliCascadeVertex.h"
#endif

struct GoodCascade {
  Int_t nlab,plab;   // V0's daughter labels
  Int_t blab;        // Bachelor label
  Int_t code;
  Float_t px,py,pz;
  Float_t x,y,z;
};
Int_t good_cascades(GoodCascade *gt, Int_t max);

Int_t AliCascadeComparison(Int_t code=3312) {
  //code= 3312; //kXiMinus 
  //code=-3312; //kXiPlusBar
  //code= 3334; //kOmegaMinus
  //code=-3334; //kOmegaPlusBar

   cerr<<"Doing comparison...\n";

   const Double_t cascadeWindow=0.05, cascadeWidth=0.015; 
   Double_t cascadeMass=0.5;
   switch (code) {
   case kXiMinus:
   case kXiPlusBar:    cascadeMass=1.32131; break;
   case kOmegaMinus: 
   case kOmegaPlusBar: cascadeMass=1.67245; break;
   default: cerr<<"Invalid PDG code !\n"; return 1;
   }

   TStopwatch timer;

   /*** Load reconstructed cascades ***/
   TFile *cf=TFile::Open("AliCascadeVertices.root");
   if (!cf->IsOpen()){cerr<<"Can't open AliCascadeVertices.root !\n";return 2;}
   TObjArray carray(1000);
   TTree *cTree=(TTree*)cf->Get("TreeCasc");
   TBranch *branch=cTree->GetBranch("cascades");
   Int_t nentr=(Int_t)cTree->GetEntries();
   for (Int_t i=0; i<nentr; i++) {
       AliCascadeVertex *iovertex=new AliCascadeVertex; 
       branch->SetAddress(&iovertex);
       cTree->GetEvent(i);
       carray.AddLast(iovertex);
   }
   cf->Close();

   /*** Check if the file with the "good" cascades exists ***/
   GoodCascade gc[100];
   Int_t ngood=0;
   ifstream in("good_cascades");
   if (in) {
      cerr<<"Reading good cascades...\n";
      while (in>>gc[ngood].nlab>>gc[ngood].plab>>
	         gc[ngood].blab>>gc[ngood].code>>
                 gc[ngood].px>>gc[ngood].py>>gc[ngood].pz>>
                 gc[ngood].x >>gc[ngood].y >>gc[ngood].z) {
         ngood++;
         cerr<<ngood<<'\r';
         if (ngood==100) {
            cerr<<"Too many good cascades !\n";
            break;
         }
      }
      if (!in.eof()) cerr<<"Read error (good_cascades) !\n";
   } else {
     /*** generate a file with the "good" cascades ***/
      cerr<<"Marking good cascades (this will take a while)...\n";
      ngood=good_cascades(gc,100);
      ofstream out("good_cascades");
      if (out) {
         for (Int_t ngd=0; ngd<ngood; ngd++)            
            out<<gc[ngd].nlab<<' '<<gc[ngd].plab<<' '<<
	         gc[ngd].blab<<' '<<gc[ngd].code<<' '<<
                 gc[ngd].px<<' '<<gc[ngd].py<<' '<<gc[ngd].pz<<' '<<
                 gc[ngd].x <<' '<<gc[ngd].y <<' '<<gc[ngd].z <<endl;
      } else cerr<<"Can not open file (good_cascades) !\n";
      out.close();
   }

   /*** create some histograms ***/
   TH1F *hp=new TH1F("hp","Angular Resolution",30,-30.,30.); //phi resolution 
   hp->SetXTitle("(mrad)"); hp->SetFillColor(2);
   TH1F *hl=new TH1F("hl","Lambda Resolution",30,-30,30);
   hl->SetXTitle("(mrad)"); hl->SetFillColor(1); hl->SetFillStyle(3013); 
   TH1F *hpt=new TH1F("hpt","Relative Pt Resolution",30,-10.,10.); 
   hpt->SetXTitle("(%)"); hpt->SetFillColor(2); 

   TH1F *hx=new TH1F("hx","Position Resolution (X,Y)",30,-3.,3.); //x res. 
   hx->SetXTitle("(mm)"); hx->SetFillColor(6);
   TH1F *hy=new TH1F("hy","Position Resolution (Y)",30,-3.,3.);   //y res
   hy->SetXTitle("(mm)"); hy->SetFillColor(1); hy->SetFillStyle(3013);
   TH1F *hz=new TH1F("hz","Position Resolution (Z)",30,-3.,3.);   //z res. 
   hz->SetXTitle("(mm)"); hz->SetFillColor(6);

   Double_t pmin=0.2, pmax=4.2; Int_t nchan=20;
   TH1F *hgood=new TH1F("hgood","Good Cascades",nchan,pmin,pmax);    
   TH1F *hfound=new TH1F("hfound","Found Cascades",nchan,pmin,pmax);
   TH1F *hfake=new TH1F("hfake","Fake Cascades",nchan,pmin,pmax);
   TH1F *hg=new TH1F("hg","Efficiency for Good Cascades",nchan,pmin,pmax);
   hg->SetLineColor(4); hg->SetLineWidth(2);
   TH1F *hf=new TH1F("hf","Probability of Fake Cascades",nchan,pmin,pmax);
   hf->SetFillColor(1); hf->SetFillStyle(3013); hf->SetLineWidth(2);

   Double_t mmin=cascadeMass-cascadeWindow, mmax=cascadeMass+cascadeWindow;
   TH1F *cs =new TH1F("v0s","Cascade Effective Mass",40, mmin, mmax);
   cs->SetXTitle("(GeV)"); cs->SetFillColor(6);

   Double_t pxg=0.,pyg=0.,ptg=0.;
   Int_t nlab=-1, plab=-1, blab=-1;
   Int_t i;
   for (i=0; i<nentr; i++) {
       AliCascadeVertex *cascade=(AliCascadeVertex*)carray.UncheckedAt(i);
       cascade->GetV0labels(nlab,plab); 
       nlab=TMath::Abs(nlab); plab=TMath::Abs(plab);
       blab=TMath::Abs(cascade->GetBachelorLabel());

       cascade->ChangeMassHypothesis(code);

       Double_t mass=cascade->GetEffMass();
       cs->Fill(mass);

       if (TMath::Abs(mass-cascadeMass)>cascadeWidth) continue;

       Int_t j;
       for (j=0; j<ngood; j++) {
          if (gc[j].code != cascade->GetPdgCode()) continue;
          if (gc[j].nlab == nlab)
          if (gc[j].plab == plab)
          if (gc[j].blab == blab) break;
       }

       Double_t px,py,pz; cascade->GetPxPyPz(px,py,pz);
       Double_t pt=TMath::Sqrt(px*px+py*py);

       if (j==ngood) {
          hfake->Fill(pt);
          cerr<<"Fake cascade: ("<<nlab<<","<<plab<<","<<blab<<")\n";
          continue;
       }

       pxg=gc[j].px; pyg=gc[j].py; ptg=TMath::Sqrt(pxg*pxg+pyg*pyg);
       Double_t phig=TMath::ATan2(pyg,pxg), phi=TMath::ATan2(py,px);
       Double_t lamg=TMath::ATan2(gc[j].pz,ptg), lam=TMath::ATan2(pz,pt);
       hp->Fill((phi - phig)*1000.);
       hl->Fill((lam - lamg)*1000.);
       hpt->Fill((1/pt - 1/ptg)/(1/ptg)*100.);

       Double_t x,y,z; cascade->GetXYZ(x,y,z);
       hx->Fill((x-gc[j].x)*10);
       hy->Fill((y-gc[j].y)*10);
       hz->Fill((z-gc[j].z)*10);

       hfound->Fill(ptg);
       gc[j].nlab=-1;

   }
   for (i=0; i<ngood; i++) {
      if (gc[i].code != code) continue;
      pxg=gc[i].px; pyg=gc[i].py; ptg=TMath::Sqrt(pxg*pxg+pyg*pyg);
      hgood->Fill(ptg);
      nlab=gc[i].nlab; plab=gc[i].plab; blab=gc[i].blab;
      if (nlab < 0) continue;
     cerr<<"Cascade ("<<nlab<<','<<plab<<","<<blab<<") has not been found !\n";
   }

   carray.Delete();

   Stat_t ng=hgood->GetEntries();
   Stat_t nf=hfound->GetEntries();

   cerr<<"Number of found cascades: "<<nentr<<" ("<<nf<<" in the peak)\n";
   cerr<<"Number of good cascades: "<<ng<<endl;

   if (ng!=0) 
      cerr<<"Integral efficiency is about "<<nf/ng*100.<<" %\n";

   gStyle->SetOptStat(111110);
   gStyle->SetOptFit(1);

   TCanvas *c1=new TCanvas("c1","",0,0,580,610);
   c1->Divide(2,2);

   c1->cd(1);
   gPad->SetFillColor(42); gPad->SetFrameFillColor(10); 
   //hp->Fit("gaus");
   hp->Draw();
   hl->Draw("same"); c1->cd();

   c1->cd(2);
   gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
   //hpt->Fit("gaus"); c1->cd();
   hpt->Draw(); c1->cd();

   c1->cd(3);
   gPad->SetFillColor(42); gPad->SetFrameFillColor(10); 
   //hx->Fit("gaus"); 
   hx->Draw(); 
   hy->Draw("same"); c1->cd();

   c1->cd(4);
   gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
   //hz->Fit("gaus");
   hz->Draw();


   TCanvas *c2=new TCanvas("c2","",600,0,580,610);
   c2->Divide(1,2);

   c2->cd(1);
   gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
   hfound->Sumw2(); hgood->Sumw2(); hfake->Sumw2();
   hg->Divide(hfound,hgood,1,1.,"b");
   hf->Divide(hfake,hgood,1,1.,"b");
   hg->SetMaximum(1.4);
   hg->SetYTitle("Cascade reconstruction efficiency");
   hg->SetXTitle("Pt (GeV/c)");
   hg->Draw();

   TLine *line1 = new TLine(pmin,1.0,pmax,1.0); line1->SetLineStyle(4);
   line1->Draw("same");
   TLine *line2 = new TLine(pmin,0.9,pmax,0.9); line2->SetLineStyle(4);
   line2->Draw("same");

   hf->SetFillColor(1);
   hf->SetFillStyle(3013);
   hf->SetLineColor(2);
   hf->SetLineWidth(2);
   hf->Draw("histsame");
   TText *text = new TText(0.461176,0.248448,"Fake cascades");
   text->SetTextSize(0.05);
   text->Draw();
   text = new TText(0.453919,1.11408,"Good cascades");
   text->SetTextSize(0.05);
   text->Draw();


   c2->cd(2);
   gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
   cs->SetXTitle("(GeV/c)"); 
   cs->Fit("gaus","","",cascadeMass-cascadeWidth,cascadeMass+cascadeWidth);
   Double_t max=cs->GetMaximum();
   TLine *line3 = 
      new TLine(cascadeMass-cascadeWidth,0.,cascadeMass-cascadeWidth,max);
   line3->Draw("same");
   TLine *line4 = 
      new TLine(cascadeMass+cascadeWidth,0.,cascadeMass+cascadeWidth,max);
   line4->Draw("same");

   timer.Stop(); timer.Print();

   return 0;
}


Int_t good_cascades(GoodCascade *gc, Int_t max) {
   Int_t nc=0;
   /*** Get information about the cuts ***/
   Double_t r2min=0.9*0.9;
   Double_t r2max=2.9*2.9;

   /*** Get labels of the "good" tracks ***/
   Double_t dd; Int_t id, label[15000], ngt=0;
   ifstream in("good_tracks_its");
   if (!in) {
     cerr<<"Can't open the file good_tracks_its \n";
     return nc;
   }
   while (in>>label[ngt]>>id>>dd>>dd>>dd>>dd>>dd>>dd) {
     ngt++;
     if (ngt>=15000) {
       cerr<<"Too many good ITS tracks !\n";
       return nc;
     }
   }   
   if (!in.eof()) {
      cerr<<"Read error (good_tracks_its) !\n";
      return nc;
   }

   /*** Get an access to the kinematics ***/
   if (gAlice) {delete gAlice; gAlice=0;}

   TFile *file=TFile::Open("galice.root");
   if (!file->IsOpen()) {cerr<<"Can't open galice.root !\n"; exit(4);}
   if (!(gAlice=(AliRun*)file->Get("gAlice"))) {
     cerr<<"gAlice has not been found on galice.root !\n";
     exit(5);
   }

   Int_t np=gAlice->GetEvent(0);
   while (np--) {
      cerr<<np<<'\r';
      TParticle *cp=gAlice->Particle(np);

      /*** only these cascades are "good" ***/
      Int_t code=cp->GetPdgCode();
      if (code!=kXiMinus)    if (code!=kXiPlusBar)
      if (code!=kOmegaMinus) if (code!=kOmegaPlusBar) continue; 

      /*** daughter tracks must be "good" ***/
      Int_t v0lab=cp->GetFirstDaughter(), blab=cp->GetLastDaughter();
      if (v0lab==blab) continue;
      if (v0lab<0) continue;
      if (blab<0) continue;

      TParticle *p0=gAlice->Particle(v0lab);
      TParticle *bp=gAlice->Particle(blab);
      if ((p0->GetPdgCode()!=kLambda0) && (p0->GetPdgCode()!=kLambda0Bar)) {
         TParticle *p=p0; p0=bp; bp=p;
         Int_t i=v0lab; v0lab=blab; blab=i;         
         if ((p0->GetPdgCode()!=kLambda0) && (p0->GetPdgCode()!=kLambda0Bar))
                                                                   continue;
      }

      /** is the bachelor "good" ? **/
      Int_t i;
      for (i=0; i<ngt; i++) if (label[i]==blab) break;
      if (i==ngt) continue; 

      /** is the V0 "good" ? **/
      Int_t plab=p0->GetFirstDaughter(), nlab=p0->GetLastDaughter();
      if (nlab==plab) continue;
      if (nlab<0) continue;
      if (plab<0) continue;

      for (i=0; i<ngt; i++) if (label[i]==nlab) break;
      if (i==ngt) continue;
      for (i=0; i<ngt; i++) if (label[i]==plab) break;
      if (i==ngt) continue;

      /*** fiducial volume ***/
      Double_t x=bp->Vx(), y=bp->Vy(), z=bp->Vz(), r2=x*x+y*y; //bachelor
      if (r2<r2min) continue;
      if (r2>r2max) continue;
      TParticle *pp=gAlice->Particle(plab);
      x=pp->Vx(); y=pp->Vy(); r2=x*x+y*y;                      //V0
      if (r2<r2min) continue;
      if (r2>r2max) continue;

      if (gAlice->Particle(plab)->GetPDG()->Charge() < 0.) {
         i=plab; plab=nlab; nlab=i;
      }

      gc[nc].code=code;
      gc[nc].plab=plab;   gc[nc].nlab=nlab; gc[nc].blab=blab;
      gc[nc].px=cp->Px(); gc[nc].py=cp->Py(); gc[nc].pz=cp->Pz();
      gc[nc].x=x; gc[nc].y=y; gc[nc].z=z;
      nc++;

   }


   return nc;
}
Commit	Line	Data
a9a2d814	1	/****************************************************************************
	2	* Very important, delicate and rather obscure macro. *
	3	* *
	4	* Creates list of "findable" cascades, *
	5	* calculates efficiency, resolutions etc. *
	6	* *
	7	* Origin: Christian Kuhn, IReS, Strasbourg, christian.kuhn@ires.in2p3.fr *
	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 "AliCascadeVertex.h"
	28	#endif
	29
	30	struct GoodCascade {
	31	Int_t nlab,plab; // V0's daughter labels
	32	Int_t blab; // Bachelor label
	33	Int_t code;
	34	Float_t px,py,pz;
	35	Float_t x,y,z;
	36	};
	37	Int_t good_cascades(GoodCascade *gt, Int_t max);
	38
	39	Int_t AliCascadeComparison(Int_t code=3312) {
	40	//code= 3312; //kXiMinus
	41	//code=-3312; //kXiPlusBar
	42	//code= 3334; //kOmegaMinus
	43	//code=-3334; //kOmegaPlusBar
	44
	45	cerr<<"Doing comparison...\n";
	46
	47	const Double_t cascadeWindow=0.05, cascadeWidth=0.015;
	48	Double_t cascadeMass=0.5;
	49	switch (code) {
	50	case kXiMinus:
	51	case kXiPlusBar: cascadeMass=1.32131; break;
	52	case kOmegaMinus:
	53	case kOmegaPlusBar: cascadeMass=1.67245; break;
	54	default: cerr<<"Invalid PDG code !\n"; return 1;
	55	}
	56
	57	TStopwatch timer;
	58
	59	/* Load reconstructed cascades */
	60	TFile *cf=TFile::Open("AliCascadeVertices.root");
	61	if (!cf->IsOpen()){cerr<<"Can't open AliCascadeVertices.root !\n";return 2;}
	62	TObjArray carray(1000);
	63	TTree cTree=(TTree)cf->Get("TreeCasc");
	64	TBranch *branch=cTree->GetBranch("cascades");
65	Int_t nentr=(Int_t)cTree->GetEntries();
66	for (Int_t i=0; i<nentr; i++) {
67	AliCascadeVertex *iovertex=new AliCascadeVertex;
68	branch->SetAddress(&iovertex);
69	cTree->GetEvent(i);
70	carray.AddLast(iovertex);
71	}
72	cf->Close();
73
74	/* Check if the file with the "good" cascades exists */
75	GoodCascade gc[100];
76	Int_t ngood=0;
77	ifstream in("good_cascades");
78	if (in) {
79	cerr<<"Reading good cascades...\n";
80	while (in>>gc[ngood].nlab>>gc[ngood].plab>>
81	gc[ngood].blab>>gc[ngood].code>>
82	gc[ngood].px>>gc[ngood].py>>gc[ngood].pz>>
83	gc[ngood].x >>gc[ngood].y >>gc[ngood].z) {
84	ngood++;
85	cerr<<ngood<<'\r';
86	if (ngood==100) {
87	cerr<<"Too many good cascades !\n";
88	break;
89	}
90	}
91	if (!in.eof()) cerr<<"Read error (good_cascades) !\n";
92	} else {
93	/* generate a file with the "good" cascades */
94	cerr<<"Marking good cascades (this will take a while)...\n";
95	ngood=good_cascades(gc,100);
96	ofstream out("good_cascades");
97	if (out) {
98	for (Int_t ngd=0; ngd<ngood; ngd++)
99	out<<gc[ngd].nlab<<' '<<gc[ngd].plab<<' '<<
100	gc[ngd].blab<<' '<<gc[ngd].code<<' '<<
101	gc[ngd].px<<' '<<gc[ngd].py<<' '<<gc[ngd].pz<<' '<<
102	gc[ngd].x <<' '<<gc[ngd].y <<' '<<gc[ngd].z <<endl;
103	} else cerr<<"Can not open file (good_cascades) !\n";
104	out.close();
105	}
106
107	/* create some histograms */
108	TH1F *hp=new TH1F("hp","Angular Resolution",30,-30.,30.); //phi resolution
109	hp->SetXTitle("(mrad)"); hp->SetFillColor(2);
110	TH1F *hl=new TH1F("hl","Lambda Resolution",30,-30,30);
111	hl->SetXTitle("(mrad)"); hl->SetFillColor(1); hl->SetFillStyle(3013);
112	TH1F *hpt=new TH1F("hpt","Relative Pt Resolution",30,-10.,10.);
113	hpt->SetXTitle("(%)"); hpt->SetFillColor(2);
114
115	TH1F *hx=new TH1F("hx","Position Resolution (X,Y)",30,-3.,3.); //x res.
116	hx->SetXTitle("(mm)"); hx->SetFillColor(6);
117	TH1F *hy=new TH1F("hy","Position Resolution (Y)",30,-3.,3.); //y res
118	hy->SetXTitle("(mm)"); hy->SetFillColor(1); hy->SetFillStyle(3013);
119	TH1F *hz=new TH1F("hz","Position Resolution (Z)",30,-3.,3.); //z res.
120	hz->SetXTitle("(mm)"); hz->SetFillColor(6);
121
122	Double_t pmin=0.2, pmax=4.2; Int_t nchan=20;
123	TH1F *hgood=new TH1F("hgood","Good Cascades",nchan,pmin,pmax);
124	TH1F *hfound=new TH1F("hfound","Found Cascades",nchan,pmin,pmax);
125	TH1F *hfake=new TH1F("hfake","Fake Cascades",nchan,pmin,pmax);
126	TH1F *hg=new TH1F("hg","Efficiency for Good Cascades",nchan,pmin,pmax);
127	hg->SetLineColor(4); hg->SetLineWidth(2);
128	TH1F *hf=new TH1F("hf","Probability of Fake Cascades",nchan,pmin,pmax);
129	hf->SetFillColor(1); hf->SetFillStyle(3013); hf->SetLineWidth(2);
130
131	Double_t mmin=cascadeMass-cascadeWindow, mmax=cascadeMass+cascadeWindow;
132	TH1F *cs =new TH1F("v0s","Cascade Effective Mass",40, mmin, mmax);
133	cs->SetXTitle("(GeV)"); cs->SetFillColor(6);
134
135	Double_t pxg=0.,pyg=0.,ptg=0.;
136	Int_t nlab=-1, plab=-1, blab=-1;
137	Int_t i;
138	for (i=0; i<nentr; i++) {
139	AliCascadeVertex cascade=(AliCascadeVertex)carray.UncheckedAt(i);
140	cascade->GetV0labels(nlab,plab);
141	nlab=TMath::Abs(nlab); plab=TMath::Abs(plab);
142	blab=TMath::Abs(cascade->GetBachelorLabel());
143
144	cascade->ChangeMassHypothesis(code);
145
146	Double_t mass=cascade->GetEffMass();
147	cs->Fill(mass);
148
149	if (TMath::Abs(mass-cascadeMass)>cascadeWidth) continue;
150
151	Int_t j;
152	for (j=0; j<ngood; j++) {
153	if (gc[j].code != cascade->GetPdgCode()) continue;
154	if (gc[j].nlab == nlab)
155	if (gc[j].plab == plab)
156	if (gc[j].blab == blab) break;
157	}
158
159	Double_t px,py,pz; cascade->GetPxPyPz(px,py,pz);
160	Double_t pt=TMath::Sqrt(pxpx+pypy);
161
162	if (j==ngood) {
163	hfake->Fill(pt);
164	cerr<<"Fake cascade: ("<<nlab<<","<<plab<<","<<blab<<")\n";
165	continue;
166	}
167
168	pxg=gc[j].px; pyg=gc[j].py; ptg=TMath::Sqrt(pxgpxg+pygpyg);
169	Double_t phig=TMath::ATan2(pyg,pxg), phi=TMath::ATan2(py,px);
170	Double_t lamg=TMath::ATan2(gc[j].pz,ptg), lam=TMath::ATan2(pz,pt);
171	hp->Fill((phi - phig)*1000.);
172	hl->Fill((lam - lamg)*1000.);
173	hpt->Fill((1/pt - 1/ptg)/(1/ptg)*100.);
174
175	Double_t x,y,z; cascade->GetXYZ(x,y,z);
176	hx->Fill((x-gc[j].x)*10);
177	hy->Fill((y-gc[j].y)*10);
178	hz->Fill((z-gc[j].z)*10);
179
180	hfound->Fill(ptg);
181	gc[j].nlab=-1;
182
183	}
184	for (i=0; i<ngood; i++) {
185	if (gc[i].code != code) continue;
186	pxg=gc[i].px; pyg=gc[i].py; ptg=TMath::Sqrt(pxgpxg+pygpyg);
187	hgood->Fill(ptg);
188	nlab=gc[i].nlab; plab=gc[i].plab; blab=gc[i].blab;
189	if (nlab < 0) continue;
190	cerr<<"Cascade ("<<nlab<<','<<plab<<","<<blab<<") has not been found !\n";
191	}
192
193	carray.Delete();
194
195	Stat_t ng=hgood->GetEntries();
196	Stat_t nf=hfound->GetEntries();
197
198	cerr<<"Number of found cascades: "<<nentr<<" ("<<nf<<" in the peak)\n";
199	cerr<<"Number of good cascades: "<<ng<<endl;
200
201	if (ng!=0)
202	cerr<<"Integral efficiency is about "<<nf/ng*100.<<" %\n";
203
204	gStyle->SetOptStat(111110);
205	gStyle->SetOptFit(1);
206
207	TCanvas *c1=new TCanvas("c1","",0,0,580,610);
208	c1->Divide(2,2);
209
210	c1->cd(1);
211	gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
212	//hp->Fit("gaus");
213	hp->Draw();
214	hl->Draw("same"); c1->cd();
215
216	c1->cd(2);
217	gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
218	//hpt->Fit("gaus"); c1->cd();
219	hpt->Draw(); c1->cd();
220
221	c1->cd(3);
222	gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
223	//hx->Fit("gaus");
224	hx->Draw();
225	hy->Draw("same"); c1->cd();
226
227	c1->cd(4);
228	gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
229	//hz->Fit("gaus");
230	hz->Draw();
231
232
233	TCanvas *c2=new TCanvas("c2","",600,0,580,610);
234	c2->Divide(1,2);
235
236	c2->cd(1);
237	gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
238	hfound->Sumw2(); hgood->Sumw2(); hfake->Sumw2();
239	hg->Divide(hfound,hgood,1,1.,"b");
240	hf->Divide(hfake,hgood,1,1.,"b");
241	hg->SetMaximum(1.4);
242	hg->SetYTitle("Cascade reconstruction efficiency");
243	hg->SetXTitle("Pt (GeV/c)");
244	hg->Draw();
245
246	TLine *line1 = new TLine(pmin,1.0,pmax,1.0); line1->SetLineStyle(4);
247	line1->Draw("same");
248	TLine *line2 = new TLine(pmin,0.9,pmax,0.9); line2->SetLineStyle(4);
249	line2->Draw("same");
250
251	hf->SetFillColor(1);
252	hf->SetFillStyle(3013);
253	hf->SetLineColor(2);
254	hf->SetLineWidth(2);
255	hf->Draw("histsame");
256	TText *text = new TText(0.461176,0.248448,"Fake cascades");
257	text->SetTextSize(0.05);
258	text->Draw();
259	text = new TText(0.453919,1.11408,"Good cascades");
260	text->SetTextSize(0.05);
261	text->Draw();
262
263
264	c2->cd(2);
265	gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
266	cs->SetXTitle("(GeV/c)");
267	cs->Fit("gaus","","",cascadeMass-cascadeWidth,cascadeMass+cascadeWidth);
268	Double_t max=cs->GetMaximum();
269	TLine *line3 =
270	new TLine(cascadeMass-cascadeWidth,0.,cascadeMass-cascadeWidth,max);
271	line3->Draw("same");
272	TLine *line4 =
273	new TLine(cascadeMass+cascadeWidth,0.,cascadeMass+cascadeWidth,max);
274	line4->Draw("same");
275
276	timer.Stop(); timer.Print();
277
278	return 0;
279	}
280
281
282
283	Int_t good_cascades(GoodCascade *gc, Int_t max) {
284	Int_t nc=0;
285	/* Get information about the cuts */
286	Double_t r2min=0.9*0.9;
287	Double_t r2max=2.9*2.9;
288
289	/* Get labels of the "good" tracks */
290	Double_t dd; Int_t id, label[15000], ngt=0;
291	ifstream in("good_tracks_its");
292	if (!in) {
293	cerr<<"Can't open the file good_tracks_its \n";
294	return nc;
295	}
296	while (in>>label[ngt]>>id>>dd>>dd>>dd>>dd>>dd>>dd) {
297	ngt++;
298	if (ngt>=15000) {
299	cerr<<"Too many good ITS tracks !\n";
300	return nc;
301	}
302	}
303	if (!in.eof()) {
304	cerr<<"Read error (good_tracks_its) !\n";
305	return nc;
306	}
307
308	/* Get an access to the kinematics */
309	if (gAlice) {delete gAlice; gAlice=0;}
310
311	TFile *file=TFile::Open("galice.root");
312	if (!file->IsOpen()) {cerr<<"Can't open galice.root !\n"; exit(4);}
313	if (!(gAlice=(AliRun*)file->Get("gAlice"))) {
314	cerr<<"gAlice has not been found on galice.root !\n";
315	exit(5);
316	}
317
318	Int_t np=gAlice->GetEvent(0);
319	while (np--) {
320	cerr<<np<<'\r';
321	TParticle *cp=gAlice->Particle(np);
322
323	/* only these cascades are "good" */
324	Int_t code=cp->GetPdgCode();
325	if (code!=kXiMinus) if (code!=kXiPlusBar)
326	if (code!=kOmegaMinus) if (code!=kOmegaPlusBar) continue;
327
328	/* daughter tracks must be "good" */
329	Int_t v0lab=cp->GetFirstDaughter(), blab=cp->GetLastDaughter();
330	if (v0lab==blab) continue;
331	if (v0lab<0) continue;
332	if (blab<0) continue;
333
334	TParticle *p0=gAlice->Particle(v0lab);
335	TParticle *bp=gAlice->Particle(blab);
336	if ((p0->GetPdgCode()!=kLambda0) && (p0->GetPdgCode()!=kLambda0Bar)) {
337	TParticle *p=p0; p0=bp; bp=p;
338	Int_t i=v0lab; v0lab=blab; blab=i;
339	if ((p0->GetPdgCode()!=kLambda0) && (p0->GetPdgCode()!=kLambda0Bar))
340	continue;
341	}
342
343	/ is the bachelor "good" ? /
344	Int_t i;
345	for (i=0; i<ngt; i++) if (label[i]==blab) break;
346	if (i==ngt) continue;
347
348	/ is the V0 "good" ? /
349	Int_t plab=p0->GetFirstDaughter(), nlab=p0->GetLastDaughter();
350	if (nlab==plab) continue;
351	if (nlab<0) continue;
352	if (plab<0) continue;
353
354	for (i=0; i<ngt; i++) if (label[i]==nlab) break;
355	if (i==ngt) continue;
356	for (i=0; i<ngt; i++) if (label[i]==plab) break;
357	if (i==ngt) continue;
358
359	/* fiducial volume */
360	Double_t x=bp->Vx(), y=bp->Vy(), z=bp->Vz(), r2=xx+yy; //bachelor
361	if (r2<r2min) continue;
362	if (r2>r2max) continue;
363	TParticle *pp=gAlice->Particle(plab);
364	x=pp->Vx(); y=pp->Vy(); r2=xx+yy; //V0
365	if (r2<r2min) continue;
366	if (r2>r2max) continue;
367
368	if (gAlice->Particle(plab)->GetPDG()->Charge() < 0.) {
369	i=plab; plab=nlab; nlab=i;
370	}
371
372	gc[nc].code=code;
373	gc[nc].plab=plab; gc[nc].nlab=nlab; gc[nc].blab=blab;
374	gc[nc].px=cp->Px(); gc[nc].py=cp->Py(); gc[nc].pz=cp->Pz();
375	gc[nc].x=x; gc[nc].y=y; gc[nc].z=z;
376	nc++;
377
378	}
379
380
381	return nc;
382	}