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