STEER/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 <TFile.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    AliESD* event = new AliESD;
 168    TTree* esdTree = (TTree*) ef->Get("esdTree");
 169    if (!esdTree) {
 170       ::Error("AliV0Comparison.C", "no ESD tree found");
 171       return 6;
 172    }
 173    esdTree->SetBranchAddress("ESD", &event);
 174
 175
 176    //******* Loop over events *********
 177    Int_t e=0;
 178    while (esdTree->GetEvent(e)) {
 179       cout<<endl<<endl<<"********* Processing event number: "<<e<<"*******\n";
 180
 181       Int_t nentr=event->GetNumberOfV0s();
 182       allfound+=nentr;
 183
 184       if (v0Tree->GetEvent(e++)==0) {
 185          cerr<<"No reconstructable V0s !\n";
 186          continue;
 187       }
 188
 189       Int_t ngood=prefs->GetEntriesFast(),ng=0;
 190
 191       Double_t pxg=0.,pyg=0.,pzg=0.,ptg=0.;
 192       Int_t nlab=-1, plab=-1;
 193       Int_t i;
 194       for (i=0; i<nentr; i++) {
 195           AliESDv0 *vertex=event->GetV0(i);
 196
 197           if (vertex->GetOnFlyStatus()) continue;
 198
 199           Int_t nidx=TMath::Abs(vertex->GetNindex());
 200           Int_t pidx=TMath::Abs(vertex->GetPindex());
 201
 202           AliESDtrack *ntrack=event->GetTrack(nidx);
 203           AliESDtrack *ptrack=event->GetTrack(pidx);
 204
 205           nlab=TMath::Abs(ntrack->GetLabel());
 206           plab=TMath::Abs(ptrack->GetLabel());
 207
 208           /** Kinematical cuts **/
 209           Double_t pxn,pyn,pzn; vertex->GetNPxPyPz(pxn,pyn,pzn);
 210           Double_t ptn=TMath::Sqrt(pxn*pxn + pyn*pyn);
 211           if (ptn < ptncut) continue;
 212           Double_t pxp,pyp,pzp; vertex->GetPPxPyPz(pxp,pyp,pzp);
 213           Double_t ptp=TMath::Sqrt(pxp*pxp + pyp*pyp);
 214           if (ptp < ptpcut) continue;
 215           Double_t kine=vertex->ChangeMassHypothesis(code);
 216           //if (TMath::Abs(kine)>kinecut) continue;
 217
 218           Double_t mass=vertex->GetEffMass();
 219           v0s->Fill(mass);
 220           v0sf->Fill(mass);
 221
 222           AliTrackReference *nref=0, *pref=0;
 223           Int_t j;
 224           for (j=0; j<ngood; j++) {
 225               nref=(AliTrackReference*)nrefs->UncheckedAt(j);
 226               pref=(AliTrackReference*)prefs->UncheckedAt(j);
 227               if (nref->Label() == nlab)
 228               if (pref->Label() == plab) break;
 229           }
 230
 231           if (TMath::Abs(mass-V0mass)>V0width) continue;
 232
 233           Double_t px,py,pz; vertex->GetPxPyPz(px,py,pz);
 234           Double_t pt=TMath::Sqrt(px*px+py*py);
 235
 236           if (j==ngood) {
 237              hfake->Fill(pt);
 238              cout<<"Fake vertex: ("<<nlab<<","<<plab<<")\n";
 239              continue;
 240           }
 241           v0sf->Fill(mass,-1);
 242
 243           pxg=nref->Px()+pref->Px(); pyg=nref->Py()+pref->Py();
 244           pzg=nref->Pz()+pref->Pz();
 245           ptg=TMath::Sqrt(pxg*pxg+pyg*pyg);
 246           Double_t phig=TMath::ATan2(pyg,pxg), phi=TMath::ATan2(py,px);
 247           Double_t lamg=TMath::ATan2(pzg,ptg), lam=TMath::ATan2(pz,pt);
 248           hp->Fill((phi - phig)*1000.);
 249           hl->Fill((lam - lamg)*1000.);
 250           hpt->Fill((1/pt - 1/ptg)/(1/ptg)*100.);
 251
 252           Double_t x,y,z; vertex->GetXYZ(x,y,z);
 253           hx->Fill((x - nref->X())*10);
 254           hy->Fill((y - nref->Y())*10);
 255           hz->Fill((z - nref->Z())*10);
 256
 257           hfound->Fill(ptg);
 258           nref->SetLabel(-1);
 259
 260       }
 261       for (i=0; i<ngood; i++) {
 262          AliTrackReference *nref=(AliTrackReference*)nrefs->UncheckedAt(i);
 263          AliTrackReference *pref=(AliTrackReference*)prefs->UncheckedAt(i);
 264          Int_t pdg=(Int_t)nref->GetLength();//this is the mother's PDG !
 265          if (code!=pdg) continue;
 266          ng++;
 267          pxg=nref->Px()+pref->Px(); pyg=nref->Py()+pref->Py();
 268          ptg=TMath::Sqrt(pxg*pxg+pyg*pyg);
 269          hgood->Fill(ptg);
 270          nlab=nref->Label(); plab=pref->Label();
 271          if (nlab < 0) continue;
 272          cout<<"Vertex ("<<nlab<<','<<plab<<") has not been found !\n";
 273       }
 274       allgood+=ng;
 275
 276       cout<<"Number of found V0s : "<<nentr<<endl;
 277       cout<<"Number of \"good\" V0s : "<<ng<<endl;
 278
 279       prefs->Clear();
 280       nrefs->Clear();
 281
 282    } //**** End of the loop over events
 283
 284    delete event;
 285    ef->Close();
 286
 287    delete v0Tree;
 288    refFile->Close();
 289
 290    Stat_t ng=hgood->GetEntries(), nf=hfound->GetEntries();
 291    if (ng!=0) cout<<"Integral efficiency is about "<<nf/ng*100.<<" %\n";
 292    cout<<"Total number of found V0s: "<<allfound<<" ("<<nf<<" in the peak)\n";
 293    cout<<"Total number of \"good\" V0s: "<<allgood<<endl;
 294
 295    gStyle->SetOptStat(111110);
 296    gStyle->SetOptFit(1);
 297
 298    TCanvas *c1=(TCanvas*)gROOT->FindObject("c1");
 299    if (!c1) {
 300       c1=new TCanvas("c1","",0,0,580,610);
 301       c1->Divide(2,2);
 302    }
 303
 304    Int_t minc=33;
 305
 306    c1->cd(1);
 307    gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
 308    if (hp->GetEntries()<minc) hp->Draw(); else hp->Fit("gaus");
 309    hl->Draw("same"); c1->cd();
 310
 311    c1->cd(2);
 312    gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
 313    if (hpt->GetEntries()<minc) hpt->Draw(); else hpt->Fit("gaus");
 314    c1->cd();
 315
 316    c1->cd(3);
 317    gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
 318    if (hx->GetEntries()<minc) hx->Draw(); else hx->Fit("gaus");
 319    hy->Draw("same"); c1->cd();
 320
 321    c1->cd(4);
 322    gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
 323    if (hz->GetEntries()<minc) hz->Draw(); else hz->Fit("gaus");
 324
 325    c1->Update();
 326
 327    TCanvas *c2=(TCanvas*)gROOT->FindObject("c2");
 328    if (!c2) {
 329       c2=new TCanvas("c2","",600,0,580,610);
 330       c2->Divide(1,2);
 331    }
 332
 333    c2->cd(1);
 334    gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
 335    hfound->Sumw2(); hgood->Sumw2(); hfake->Sumw2();
 336    hg->Divide(hfound,hgood,1,1.,"b");
 337    hf->Divide(hfake,hgood,1,1.,"b");
 338    hg->SetMaximum(1.4);
 339    hg->SetYTitle("V0 reconstruction efficiency");
 340    hg->SetXTitle("Pt (GeV/c)");
 341    hg->Draw();
 342
 343    TLine *line1 = new TLine(pmin,1.0,pmax,1.0); line1->SetLineStyle(4);
 344    line1->Draw("same");
 345    TLine *line2 = new TLine(pmin,0.9,pmax,0.9); line2->SetLineStyle(4);
 346    line2->Draw("same");
 347
 348    hf->SetFillColor(1);
 349    hf->SetFillStyle(3013);
 350    hf->SetLineColor(2);
 351    hf->SetLineWidth(2);
 352    hf->Draw("histsame");
 353    TText *text = new TText(0.461176,0.248448,"Fake vertices");
 354    text->SetTextSize(0.05);
 355    text->Draw();
 356    text = new TText(0.453919,1.11408,"Good vertices");
 357    text->SetTextSize(0.05);
 358    text->Draw();
 359
 360
 361    c2->cd(2);
 362    gPad->SetFillColor(42); gPad->SetFrameFillColor(10);
 363    if (v0s->GetEntries()<minc) v0s->Draw();
 364    else v0s->Fit("gaus","","",V0mass-V0width,V0mass+V0width);
 365    v0sf->Draw("same");
 366    Double_t max=v0s->GetMaximum();
 367    TLine *line3 = new TLine(V0mass-V0width,0.,V0mass-V0width,max);
 368    line3->Draw("same");
 369    TLine *line4 = new TLine(V0mass+V0width,0.,V0mass+V0width,max);
 370    line4->Draw("same");
 371
 372    c2->Update();
 373
 374    TFile fc("AliV0Comparison.root","RECREATE");
 375    c1->Write();
 376    c2->Write();
 377    fc.Close();
 378
 379    gBenchmark->Stop("AliV0Comparison");
 380    gBenchmark->Show("AliV0Comparison");
 381
 382    return 0;
 383 }
 384
 385
 386 Int_t GoodV0s(const Char_t *dir) {
 387    if (gAlice) {
 388        delete gAlice->GetRunLoader();
 389        delete gAlice;//if everything was OK here it is already NULL
 390        gAlice = 0x0;
 391    }
 392
 393    Char_t fname[100];
 394    sprintf(fname,"%s/galice.root",dir);
 395
 396    AliRunLoader *rl = AliRunLoader::Open(fname,"COMPARISON");
 397    if (!rl) {
 398       ::Error("GoodTracksITS","Can't start session !");
 399       return 1;
 400    }
 401
 402    rl->LoadgAlice();
 403    rl->LoadHeader();
 404    rl->LoadKinematics();
 405
 406
 407    Int_t nev=rl->GetNumberOfEvents();
 408    ::Info("GoodV0s","Number of events : %d\n",nev);
 409
 410    sprintf(fname,"%s/GoodTracksITS.root",dir);
 411    TFile *itsFile=TFile::Open(fname);
 412    if ((!itsFile)||(!itsFile->IsOpen())) {
 413        ::Error("GoodV0s","Can't open the GoodTracksITS.root !");
 414        delete rl;
 415        return 5;
 416    }
 417    TClonesArray dum("AliTrackReference",1000), *itsRefs=&dum;
 418    TTree *itsTree=(TTree*)itsFile->Get("itsTree");
 419    if (!itsTree) {
 420        ::Error("GoodV0s","Can't get the ITS reference tree !");
 421        delete rl;
 422        return 6;
 423    }
 424    TBranch *itsBranch=itsTree->GetBranch("ITS");
 425    if (!itsBranch) {
 426       ::Error("GoodV0s","Can't get the ITS reference branch !");
 427       delete rl;
 428       return 7;
 429    }
 430    itsBranch->SetAddress(&itsRefs);
 431
 432
 433    sprintf(fname,"%s/GoodV0s.root",dir);
 434    TFile *v0File=TFile::Open(fname,"recreate");
 435    TClonesArray dummy("AliTrackReference",1000), *nrefs=&dummy;
 436    TClonesArray dumm("AliTrackReference",1000), *prefs=&dumm;
 437    TTree v0Tree("v0Tree","Tree with info about the reconstructable V0s");
 438    v0Tree.Branch("negative",&nrefs);
 439    v0Tree.Branch("positive",&prefs);
 440
 441
 442    /*** Some information about the cuts ***/
 443    Double_t r2min=0.9*0.9;
 444    Double_t r2max=2.9*2.9;
 445
 446
 447
 448    //********  Loop over generated events
 449    for (Int_t e=0; e<nev; e++) {
 450       rl->GetEvent(e);  v0File->cd();
 451
 452       Int_t np = rl->GetHeader()->GetNtrack();
 453       cout<<"Event "<<e<<" Number of particles: "<<np<<endl;
 454
 455       itsTree->GetEvent(e);
 456       Int_t nk=itsRefs->GetEntriesFast();
 457
 458       AliStack *stack=rl->Stack();
 459
 460       AliTrackReference *nref=0, *pref=0;
 461
 462       Int_t nv=0;
 463       while (np--) {
 464         //cerr<<np<<'\r';
 465          TParticle *p0=stack->Particle(np);
 466
 467          /*** only these V0s are "good" ***/
 468          Int_t code=p0->GetPdgCode();
 469          if (code!=kK0Short)
 470          if (code!=kLambda0)
 471          if (code!=kLambda0Bar) continue;
 472
 473          /*** daughter tracks should be "good" ***/
 474          Int_t plab=p0->GetFirstDaughter(), nlab=p0->GetLastDaughter();
 475          if (nlab==plab) continue;
 476          if (nlab<0) continue;
 477          if (plab<0) continue;
 478          Int_t i;
 479          TParticle * part = stack->Particle(plab);
 480          if (part) {
 481            TParticlePDG * partPDG = part->GetPDG();
 482              if (partPDG && partPDG->Charge() < 0.) {
 483                i=plab; plab=nlab; nlab=i;
 484              }
 485          }
 486
 487          for (i=0; i<nk; i++) {
 488              nref=(AliTrackReference*)itsRefs->UncheckedAt(i);
 489              if (nref->Label()==nlab) break;
 490          }
 491          if (i==nk) continue;
 492          for (i=0; i<nk; i++) {
 493              pref=(AliTrackReference*)itsRefs->UncheckedAt(i);
 494              if (pref->Label()==plab) break;
 495          }
 496          if (i==nk) continue;
 497
 498          /*** fiducial volume ***/
 499          TParticle *p=stack->Particle(nlab);
 500          Double_t x=p->Vx(), y=p->Vy(), z=p->Vz(), r2=x*x+y*y;
 501          if (r2<r2min) continue;
 502          if (r2>r2max) continue;
 503
 504          Int_t pdg=p0->GetPdgCode();
 505          nref->SetLength(pdg);  //This will the V0's PDG !
 506
 507          new((*nrefs)[nv]) AliTrackReference(*nref);
 508          new((*prefs)[nv]) AliTrackReference(*pref);
 509
 510          nv++;
 511       }
 512       itsRefs->Clear();
 513
 514       v0Tree.Fill();
 515       nrefs->Clear(); prefs->Clear();
 516
 517    }  //**** end of the loop over generated events
 518
 519    v0Tree.Write();
 520    v0File->Close();
 521
 522    delete itsTree;
 523    itsFile->Close();
 524
 525    delete rl;
 526    return 0;
 527 }