ITS/AliV0Comparison.C

   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 #if !defined(__CINT__) || defined(__MAKECINT__)
  11   #include <TMath.h>
  12   #include <TError.h>
  13   #include <Riostream.h>
  14   #include <TH1F.h>
  15   #include <TTree.h>
  16   #include <TParticle.h>
  17   #include <TCanvas.h>
  18   #include <TLine.h>
  19   #include <TText.h>
  20   #include <TBenchmark.h>
  21   #include <TStyle.h>
  22   #include <TKey.h>
  23   #include <TROOT.h>
  24
  25   #include "AliStack.h"
  26   #include "AliHeader.h"
  27   #include "AliTrackReference.h"
  28   #include "AliRunLoader.h"
  29   #include "AliRun.h"
  30   #include "AliESD.h"
  31 #endif
  32
  33 Int_t GoodV0s(const Char_t *dir=".");
  34
  35 extern AliRun *gAlice;
  36 extern TBenchmark *gBenchmark;
  37 extern TROOT *gROOT;
  38
  39 static Int_t allgood=0;
  40 static Int_t allfound=0;
  41
  42 Int_t AliV0Comparison(Int_t code=310, const Char_t *dir=".") {
  43    //Lambda=3122, LambdaBar=-3122
  44    gBenchmark->Start("AliV0Comparison");
  45
  46    ::Info("AliV0Comparison.C","Doing comparison...");
  47
  48
  49    const Double_t V0window=0.05;
  50    Double_t ptncut=0.13, ptpcut=0.13, kinecut=0.03;
  51    Double_t V0mass=0.497672, V0width=0.020;
  52    switch (code) {
  53    case kK0Short:
  54         break;
  55    case kLambda0:
  56         V0mass=1.115683; V0width=0.015; ptpcut=0.50; kinecut=0.002;
  57         break;
  58    case kLambda0Bar:
  59         V0mass=1.115683; V0width=0.015; ptncut=0.50; kinecut=0.002;
  60         break;
  61    default: cerr<<"Invalid PDG code !\n"; return 1;
  62    }
  63
  64    TH1F *hp=(TH1F*)gROOT->FindObject("hp");
  65    if (!hp) hp=new TH1F("hp","PHI Resolution",30,-30.,30.);
  66    hp->SetXTitle("(mrad)"); hp->SetFillColor(2);
  67
  68    TH1F *hl=(TH1F*)gROOT->FindObject("hl");
  69    if (!hl) hl=new TH1F("hl","LAMBDA Resolution",30,-30,30);
  70    hl->SetXTitle("(mrad)"); hl->SetFillColor(1); hl->SetFillStyle(3013);
  71
  72    TH1F *hpt=(TH1F*)gROOT->FindObject("hpt");
  73    if (!hpt) hpt=new TH1F("hpt","Relative Pt Resolution",30,-10.,10.);
  74    hpt->SetXTitle("(%)"); hpt->SetFillColor(2);
  75
  76    TH1F *hx=(TH1F*)gROOT->FindObject("hx");
  77    if (!hx) hx=new TH1F("hx","Position Resolution (X)",30,-3.,3.);
  78    hx->SetXTitle("(mm)"); hx->SetFillColor(6);
  79
  80    TH1F *hy=(TH1F*)gROOT->FindObject("hy");
  81    if (!hy) hy=new TH1F("hy","Position Resolution (Y)",30,-3.,3.);
  82    hy->SetXTitle("(mm)"); hy->SetFillColor(1); hy->SetFillStyle(3013);
  83
  84    TH1F *hz=(TH1F*)gROOT->FindObject("hz");
  85    if (!hz) hz=new TH1F("hz","Position Resolution (Z)",30,-3.,3.);
  86    hz->SetXTitle("(mm)"); hz->SetFillColor(6);
  87
  88
  89    Double_t pmin=0.2, pmax=4.2; Int_t nchan=20;
  90    TH1F *hgood=(TH1F*)gROOT->FindObject("hgood");
  91    if (!hgood) hgood=new TH1F("hgood","Good Vertices",nchan,pmin,pmax);
  92
  93    TH1F *hfound=(TH1F*)gROOT->FindObject("hfound");
  94    if (!hfound) hfound=new TH1F("hfound","Found Vertices",nchan,pmin,pmax);
  95
  96    TH1F *hfake=(TH1F*)gROOT->FindObject("hfake");
  97    if (!hfake) hfake=new TH1F("hfake","Fake Vertices",nchan,pmin,pmax);
  98
  99    TH1F *hg=(TH1F*)gROOT->FindObject("hg");
 100    if (!hg) hg=new TH1F("hg","Efficiency for Good Vertices",nchan,pmin,pmax);
 101    hg->SetLineColor(4); hg->SetLineWidth(2);
 102
 103    TH1F *hf=(TH1F*)gROOT->FindObject("hf");
 104    if (!hf) hf=new TH1F("hf","Probability of Fake Vertices",nchan,pmin,pmax);
 105    hf->SetFillColor(1); hf->SetFillStyle(3013); hf->SetLineWidth(2);
 106
 107
 108    Double_t mmin=V0mass-V0window, mmax=V0mass+V0window;
 109    TH1F *v0s=(TH1F*)gROOT->FindObject("v0s");
 110    if (!v0s) v0s=new TH1F("v0s","V0s Effective Mass",40, mmin, mmax);
 111    v0s->SetXTitle("(GeV)"); v0s->SetLineColor(4); v0s->SetLineWidth(4);
 112
 113    TH1F *v0sf=(TH1F*)gROOT->FindObject("v0sf");
 114    if (!v0sf) v0sf=new TH1F("v0sf","Fake V0s Effective Mass",40, mmin, mmax);
 115    v0sf->SetXTitle("(GeV)"); v0sf->SetFillColor(6);
 116
 117
 118    Char_t fname[100];
 119    sprintf(fname,"%s/GoodV0s.root",dir);
 120
 121    TFile *refFile=TFile::Open(fname,"old");
 122    if (!refFile || !refFile->IsOpen()) {
 123    ::Info("AliV0Comparison.C","Marking good V0s (will take a while)...");
 124      if (GoodV0s(dir)) {
 125         ::Error("AliV0Comparison.C","Can't generate the reference file !");
 126         return 1;
 127      }
 128    }
 129    refFile=TFile::Open(fname,"old");
 130    if (!refFile || !refFile->IsOpen()) {
 131      ::Error("AliV0Comparison.C","Can't open the reference file !");
 132      return 1;
 133    }
 134
 135    TTree *v0Tree=(TTree*)refFile->Get("v0Tree");
 136    if (!v0Tree) {
 137      ::Error("AliV0Comparison.C","Can't get the reference tree !");
 138      return 2;
 139    }
 140    TBranch *pbranch=v0Tree->GetBranch("positive");
 141    if (!pbranch) {
 142      ::Error("AliV0Comparison.C","Can't get the positive daughter branch !");
 143      return 3;
 144    }
 145    TClonesArray dummy("AliTrackReference",1000), *prefs=&dummy;
 146    pbranch->SetAddress(&prefs);
 147
 148    TBranch *nbranch=v0Tree->GetBranch("negative");
 149    if (!nbranch) {
 150      ::Error("AliV0Comparison.C","Can't get the negative daughter branch !");
 151      return 4;
 152    }
 153    TClonesArray dumm("AliTrackReference",1000), *nrefs=&dumm;
 154    nbranch->SetAddress(&nrefs);
 155
 156
 157    sprintf(fname,"%s/AliESDs.root",dir);
 158    TFile *ef=TFile::Open(fname);
 159    if ((!ef)||(!ef->IsOpen())) {
 160       sprintf(fname,"%s/AliESDv0.root",dir);
 161       ef=TFile::Open(fname);
 162       if ((!ef)||(!ef->IsOpen())) {
 163          ::Error("AliV0Comparison.C","Can't open AliESDv0.root !");
 164          return 5;
 165       }
 166    }
 167    TKey *key=0;
 168    TIter next(ef->GetListOfKeys());
 169
 170
 171    //******* Loop over events *********
 172    Int_t e=0;
 173    while ((key=(TKey*)next())!=0) {
 174       cout<<endl<<endl<<"********* Processing event number: "<<e<<"*******\n";
 175
 176       AliESD *event=(AliESD*)key->ReadObj();
 177
 178       Int_t nentr=event->GetNumberOfV0s();
 179       allfound+=nentr;
 180
 181       if (v0Tree->GetEvent(e++)==0) {
 182          cerr<<"No reconstructable V0s !\n";
 183          continue;
 184       }
 185
 186       Int_t ngood=prefs->GetEntriesFast(),ng=0;
 187
 188       Double_t pxg=0.,pyg=0.,pzg=0.,ptg=0.;
 189       Int_t nlab=-1, plab=-1;
 190       Int_t i;
 191       for (i=0; i<nentr; i++) {
 192           AliESDv0 *vertex=event->GetV0(i);
 193
 194           Int_t nidx=TMath::Abs(vertex->GetNindex());
 195           Int_t pidx=TMath::Abs(vertex->GetPindex());
 196
 197           AliESDtrack *ntrack=event->GetTrack(nidx);
 198           AliESDtrack *ptrack=event->GetTrack(pidx);
 199
 200           nlab=TMath::Abs(ntrack->GetLabel());
 201           plab=TMath::Abs(ptrack->GetLabel());
 202
 203           /** Kinematical cuts **/
 204           Double_t pxn,pyn,pzn; vertex->GetNPxPyPz(pxn,pyn,pzn);
 205           Double_t ptn=TMath::Sqrt(pxn*pxn + pyn*pyn);
 206           if (ptn < ptncut) continue;
 207           Double_t pxp,pyp,pzp; vertex->GetPPxPyPz(pxp,pyp,pzp);
 208           Double_t ptp=TMath::Sqrt(pxp*pxp + pyp*pyp);
 209           if (ptp < ptpcut) continue;
 210           Double_t kine=vertex->ChangeMassHypothesis(code);
 211           //if (TMath::Abs(kine)>kinecut) continue;
 212
 213           Double_t mass=vertex->GetEffMass();
 214           v0s->Fill(mass);
 215           v0sf->Fill(mass);
 216
 217           AliTrackReference *nref=0, *pref=0;
 218           Int_t j;
 219           for (j=0; j<ngood; j++) {
 220               nref=(AliTrackReference*)nrefs->UncheckedAt(j);
 221               pref=(AliTrackReference*)prefs->UncheckedAt(j);
 222               if (nref->Label() == nlab)
 223               if (pref->Label() == plab) break;
 224           }
 225
 226           if (TMath::Abs(mass-V0mass)>V0width) continue;
 227
 228           Double_t px,py,pz; vertex->GetPxPyPz(px,py,pz);
 229           Double_t pt=TMath::Sqrt(px*px+py*py);
 230
 231           if (j==ngood) {
 232              hfake->Fill(pt);
 233              cout<<"Fake vertex: ("<<nlab<<","<<plab<<")\n";
 234              continue;
 235           }
 236           v0sf->Fill(mass,-1);
 237
 238           pxg=nref->Px()+pref->Px(); pyg=nref->Py()+pref->Py();
 239           pzg=nref->Pz()+pref->Pz();
 240           ptg=TMath::Sqrt(pxg*pxg+pyg*pyg);
 241           Double_t phig=TMath::ATan2(pyg,pxg), phi=TMath::ATan2(py,px);
 242           Double_t lamg=TMath::ATan2(pzg,ptg), lam=TMath::ATan2(pz,pt);
 243           hp->Fill((phi - phig)*1000.);
 244           hl->Fill((lam - lamg)*1000.);
 245           hpt->Fill((1/pt - 1/ptg)/(1/ptg)*100.);
 246
 247           Double_t x,y,z; vertex->GetXYZ(x,y,z);
 248           hx->Fill((x - nref->X())*10);
 249           hy->Fill((y - nref->Y())*10);
 250           hz->Fill((z - nref->Z())*10);
 251
 252           hfound->Fill(ptg);
 253           nref->SetLabel(-1);
 254
 255       }
 256       for (i=0; i<ngood; i++) {
 257          AliTrackReference *nref=(AliTrackReference*)nrefs->UncheckedAt(i);
 258          AliTrackReference *pref=(AliTrackReference*)prefs->UncheckedAt(i);
 259          Int_t pdg=(Int_t)nref->GetLength();//this is the mother's PDG !
 260          if (code!=pdg) continue;
 261          ng++;
 262          pxg=nref->Px()+pref->Px(); pyg=nref->Py()+pref->Py();
 263          ptg=TMath::Sqrt(pxg*pxg+pyg*pyg);
 264          hgood->Fill(ptg);
 265          nlab=nref->Label(); plab=pref->Label();
 266          if (nlab < 0) continue;
 267          cout<<"Vertex ("<<nlab<<','<<plab<<") has not been found !\n";
 268       }
 269       allgood+=ng;
 270
 271       cout<<"Number of found V0s : "<<nentr<<endl;
 272       cout<<"Number of \"good\" V0s : "<<ng<<endl;
 273
 274       prefs->Clear();
 275       nrefs->Clear();
 276       delete event;
 277
 278    } //**** End of the loop over events
 279
 280    ef->Close();
 281
 282    delete v0Tree;
 283    refFile->Close();
 284
 285    Stat_t ng=hgood->GetEntries(), nf=hfound->GetEntries();
 286    if (ng!=0) cout<<"Integral efficiency is about "<<nf/ng*100.<<" %\n";
 287    cout<<"Total number of found V0s: "<<allfound<<" ("<<nf<<" in the peak)\n";
 288    cout<<"Total number of \"good\" V0s: "<<allgood<<endl;
 289
 290    gStyle->SetOptStat(111110);
 291    gStyle->SetOptFit(1);
 292
 293    TCanvas *c1=(TCanvas*)gROOT->FindObject("c1");
 294    if (!c1) {
 295       c1=new TCanvas("c1","",0,0,580,610);
 296       c1->Divide(2,2);
 297    }
 298
 299    Int_t minc=33;
 300
 301    c1->cd(1);
 302    gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
 303    if (hp->GetEntries()<minc) hp->Draw(); else hp->Fit("gaus");
 304    hl->Draw("same"); c1->cd();
 305
 306    c1->cd(2);
 307    gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
 308    if (hpt->GetEntries()<minc) hpt->Draw(); else hpt->Fit("gaus");
 309    c1->cd();
 310
 311    c1->cd(3);
 312    gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
 313    if (hx->GetEntries()<minc) hx->Draw(); else hx->Fit("gaus");
 314    hy->Draw("same"); c1->cd();
 315
 316    c1->cd(4);
 317    gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
 318    if (hz->GetEntries()<minc) hz->Draw(); else hz->Fit("gaus");
 319
 320    c1->Update();
 321
 322    TCanvas *c2=(TCanvas*)gROOT->FindObject("c2");
 323    if (!c2) {
 324       c2=new TCanvas("c2","",600,0,580,610);
 325       c2->Divide(1,2);
 326    }
 327
 328    c2->cd(1);
 329    gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
 330    hfound->Sumw2(); hgood->Sumw2(); hfake->Sumw2();
 331    hg->Divide(hfound,hgood,1,1.,"b");
 332    hf->Divide(hfake,hgood,1,1.,"b");
 333    hg->SetMaximum(1.4);
 334    hg->SetYTitle("V0 reconstruction efficiency");
 335    hg->SetXTitle("Pt (GeV/c)");
 336    hg->Draw();
 337
 338    TLine *line1 = new TLine(pmin,1.0,pmax,1.0); line1->SetLineStyle(4);
 339    line1->Draw("same");
 340    TLine *line2 = new TLine(pmin,0.9,pmax,0.9); line2->SetLineStyle(4);
 341    line2->Draw("same");
 342
 343    hf->SetFillColor(1);
 344    hf->SetFillStyle(3013);
 345    hf->SetLineColor(2);
 346    hf->SetLineWidth(2);
 347    hf->Draw("histsame");
 348    TText *text = new TText(0.461176,0.248448,"Fake vertices");
 349    text->SetTextSize(0.05);
 350    text->Draw();
 351    text = new TText(0.453919,1.11408,"Good vertices");
 352    text->SetTextSize(0.05);
 353    text->Draw();
 354
 355
 356    c2->cd(2);
 357    gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
 358    if (v0s->GetEntries()<minc) v0s->Draw();
 359    else v0s->Fit("gaus","","",V0mass-V0width,V0mass+V0width);
 360    v0sf->Draw("same");
 361    Double_t max=v0s->GetMaximum();
 362    TLine *line3 = new TLine(V0mass-V0width,0.,V0mass-V0width,max);
 363    line3->Draw("same");
 364    TLine *line4 = new TLine(V0mass+V0width,0.,V0mass+V0width,max);
 365    line4->Draw("same");
 366
 367    c2->Update();
 368
 369    TFile fc("AliV0Comparison.root","RECREATE");
 370    c1->Write();
 371    c2->Write();
 372    fc.Close();
 373
 374    gBenchmark->Stop("AliV0Comparison");
 375    gBenchmark->Show("AliV0Comparison");
 376
 377    return 0;
 378 }
 379
 380
 381 Int_t GoodV0s(const Char_t *dir) {
 382    if (gAlice) {
 383        delete gAlice->GetRunLoader();
 384        delete gAlice;//if everything was OK here it is already NULL
 385        gAlice = 0x0;
 386    }
 387
 388    Char_t fname[100];
 389    sprintf(fname,"%s/galice.root",dir);
 390
 391    AliRunLoader *rl = AliRunLoader::Open(fname,"COMPARISON");
 392    if (!rl) {
 393       ::Error("GoodTracksITS","Can't start session !");
 394       return 1;
 395    }
 396
 397    rl->LoadgAlice();
 398    rl->LoadHeader();
 399    rl->LoadKinematics();
 400
 401
 402    Int_t nev=rl->GetNumberOfEvents();
 403    ::Info("GoodV0s","Number of events : %d\n",nev);
 404
 405    sprintf(fname,"%s/GoodTracksITS.root",dir);
 406    TFile *itsFile=TFile::Open(fname);
 407    if ((!itsFile)||(!itsFile->IsOpen())) {
 408        ::Error("GoodV0s","Can't open the GoodTracksITS.root !");
 409        delete rl;
 410        return 5;
 411    }
 412    TClonesArray dum("AliTrackReference",1000), *itsRefs=&dum;
 413    TTree *itsTree=(TTree*)itsFile->Get("itsTree");
 414    if (!itsTree) {
 415        ::Error("GoodV0s","Can't get the ITS reference tree !");
 416        delete rl;
 417        return 6;
 418    }
 419    TBranch *itsBranch=itsTree->GetBranch("ITS");
 420    if (!itsBranch) {
 421       ::Error("GoodV0s","Can't get the ITS reference branch !");
 422       delete rl;
 423       return 7;
 424    }
 425    itsBranch->SetAddress(&itsRefs);
 426
 427
 428    sprintf(fname,"%s/GoodV0s.root",dir);
 429    TFile *v0File=TFile::Open(fname,"recreate");
 430    TClonesArray dummy("AliTrackReference",1000), *nrefs=&dummy;
 431    TClonesArray dumm("AliTrackReference",1000), *prefs=&dumm;
 432    TTree v0Tree("v0Tree","Tree with info about the reconstructable V0s");
 433    v0Tree.Branch("negative",&nrefs);
 434    v0Tree.Branch("positive",&prefs);
 435
 436
 437    /*** Some information about the cuts ***/
 438    Double_t r2min=0.9*0.9;
 439    Double_t r2max=2.9*2.9;
 440
 441
 442
 443    //********  Loop over generated events
 444    for (Int_t e=0; e<nev; e++) {
 445       rl->GetEvent(e);  v0File->cd();
 446
 447       Int_t np = rl->GetHeader()->GetNtrack();
 448       cout<<"Event "<<e<<" Number of particles: "<<np<<endl;
 449
 450       itsTree->GetEvent(e);
 451       Int_t nk=itsRefs->GetEntriesFast();
 452
 453       AliStack *stack=rl->Stack();
 454
 455       AliTrackReference *nref=0, *pref=0;
 456
 457       Int_t nv=0;
 458       while (np--) {
 459         //cerr<<np<<'\r';
 460          TParticle *p0=stack->Particle(np);
 461
 462          /*** only these V0s are "good" ***/
 463          Int_t code=p0->GetPdgCode();
 464          if (code!=kK0Short)
 465          if (code!=kLambda0)
 466          if (code!=kLambda0Bar) continue;
 467
 468          /*** daughter tracks should be "good" ***/
 469          Int_t plab=p0->GetFirstDaughter(), nlab=p0->GetLastDaughter();
 470          if (nlab==plab) continue;
 471          if (nlab<0) continue;
 472          if (plab<0) continue;
 473          Int_t i;
 474          if (stack->Particle(plab)->GetPDG()->Charge() < 0.) {
 475             i=plab; plab=nlab; nlab=i;
 476          }
 477
 478          for (i=0; i<nk; i++) {
 479              nref=(AliTrackReference*)itsRefs->UncheckedAt(i);
 480              if (nref->Label()==nlab) break;
 481          }
 482          if (i==nk) continue;
 483          for (i=0; i<nk; i++) {
 484              pref=(AliTrackReference*)itsRefs->UncheckedAt(i);
 485              if (pref->Label()==plab) break;
 486          }
 487          if (i==nk) continue;
 488
 489          /*** fiducial volume ***/
 490          TParticle *p=stack->Particle(nlab);
 491          Double_t x=p->Vx(), y=p->Vy(), z=p->Vz(), r2=x*x+y*y;
 492          if (r2<r2min) continue;
 493          if (r2>r2max) continue;
 494
 495          Int_t pdg=p0->GetPdgCode();
 496          nref->SetLength(pdg);  //This will the V0's PDG !
 497
 498          new((*nrefs)[nv]) AliTrackReference(*nref);
 499          new((*prefs)[nv]) AliTrackReference(*pref);
 500
 501          nv++;
 502       }
 503       itsRefs->Clear();
 504
 505       v0Tree.Fill();
 506       nrefs->Clear(); prefs->Clear();
 507
 508    }  //**** end of the loop over generated events
 509
 510    v0Tree.Write();
 511    v0File->Close();
 512
 513    delete itsTree;
 514    itsFile->Close();
 515
 516    delete rl;
 517    return 0;
 518 }