[u/mrichter/AliRoot.git] / MUON / MUONmassPlot_ESD.C

#if !defined(__CINT__) || defined(__MAKECINT__)
// ROOT includes
#include "TTree.h"
#include "TBranch.h"
#include "TClonesArray.h"
#include "TLorentzVector.h"
#include "TFile.h"
#include "TH1.h"
#include "TH2.h"
#include "TParticle.h"
#include "TTree.h"
#include <Riostream.h>

// STEER includes
#include "AliRun.h"
#include "AliRunLoader.h"
#include "AliHeader.h"
#include "AliLoader.h"
#include "AliStack.h"
#include "AliMagF.h"
#include "AliESD.h"

// MUON includes
#include "AliESDMuonTrack.h"
#endif
//
// Macro MUONmassPlot.C for ESD
// Ch. Finck, Subatech, April. 2004
//

// macro to make invariant mass plots
// for combinations of 2 muons with opposite charges,
// from root file "MUON.tracks.root" containing the result of track reconstruction.
// Histograms are stored on the "MUONmassPlot.root" file.
// introducing TLorentzVector for parameter calculations (Pt, P,rap,etc...)
// using Invariant Mass for rapidity.

// Arguments:
//   FirstEvent (default 0)
//   LastEvent (default 0)
//   ResType (default 553)
//      553 for Upsilon, anything else for J/Psi
//   Chi2Cut (default 100)
//      to keep only tracks with chi2 per d.o.f. < Chi2Cut
//   PtCutMin (default 1)
//      to keep only tracks with transverse momentum > PtCutMin
//   PtCutMax (default 10000)
//      to keep only tracks with transverse momentum < PtCutMax
//   massMin (default 9.17 for Upsilon) 
//      &  massMax (default 9.77 for Upsilon) 
//         to calculate the reconstruction efficiency for resonances with invariant mass
//         massMin < mass < massMax.

// Add parameters and histograms for analysis 

Bool_t MUONmassPlot(char* filename = "galice.root", Int_t FirstEvent = 0, Int_t LastEvent = 10000,
		  char* esdFileName = "AliESDs.root", Int_t ResType = 553, 
                  Float_t Chi2Cut = 100., Float_t PtCutMin = 1., Float_t PtCutMax = 10000.,
                  Float_t massMin = 9.17,Float_t massMax = 9.77)
{
  cout << "MUONmassPlot " << endl;
  cout << "FirstEvent " << FirstEvent << endl;
  cout << "LastEvent " << LastEvent << endl;
  cout << "ResType " << ResType << endl;
  cout << "Chi2Cut " << Chi2Cut << endl;
  cout << "PtCutMin " << PtCutMin << endl;
  cout << "PtCutMax " << PtCutMax << endl;
  cout << "massMin " << massMin << endl;
  cout << "massMax " << massMax << endl;

 
  //Reset ROOT and connect tree file
  gROOT->Reset();

  // File for histograms and histogram booking
  TFile *histoFile = new TFile("MUONmassPlot.root", "RECREATE");
  TH1F *hPtMuon = new TH1F("hPtMuon", "Muon Pt (GeV/c)", 100, 0., 20.);
  TH1F *hPtMuonPlus = new TH1F("hPtMuonPlus", "Muon+ Pt (GeV/c)", 100, 0., 20.);
  TH1F *hPtMuonMinus = new TH1F("hPtMuonMinus", "Muon- Pt (GeV/c)", 100, 0., 20.);
  TH1F *hPMuon = new TH1F("hPMuon", "Muon P (GeV/c)", 100, 0., 200.);
  TH1F *hChi2PerDof = new TH1F("hChi2PerDof", "Muon track chi2/d.o.f.", 100, 0., 20.);
  TH1F *hInvMassAll = new TH1F("hInvMassAll", "Mu+Mu- invariant mass (GeV/c2)", 480, 0., 12.);
  TH1F *hInvMassBg = new TH1F("hInvMassBg", "Mu+Mu- invariant mass BG(GeV/c2)", 480, 0., 12.);
TH2F *hInvMassAll_vs_Pt = new TH2F("hInvMassAll_vs_Pt","hInvMassAll_vs_Pt",480,0.,12.,80,0.,20.);
TH2F *hInvMassBgk_vs_Pt = new TH2F("hInvMassBgk_vs_Pt","hInvMassBgk_vs_Pt",480,0.,12.,80,0.,20.);
TH1F *hInvMassRes;

  if (ResType == 553) {
    hInvMassRes = new TH1F("hInvMassRes", "Mu+Mu- invariant mass (GeV/c2) around Upsilon", 60, 8., 11.);
  } else {
    hInvMassRes = new TH1F("hInvMassRes", "Mu+Mu- invariant mass (GeV/c2) around J/Psi", 80, 0., 5.);
  }

  TH1F *hNumberOfTrack = new TH1F("hNumberOfTrack","nb of track /evt ",20,-0.5,19.5);
  TH1F *hRapMuon = new TH1F("hRapMuon"," Muon Rapidity",50,-4.5,-2);
  TH1F *hRapResonance = new TH1F("hRapResonance"," Resonance Rapidity",50,-4.5,-2);
  TH1F *hPtResonance = new TH1F("hPtResonance", "Resonance Pt (GeV/c)", 100, 0., 20.);
  TH2F *hThetaPhiPlus = new TH2F("hThetaPhiPlus", "Theta vs Phi +", 760, -190., 190., 400, 160., 180.);
  TH2F *hThetaPhiMinus = new TH2F("hThetaPhiMinus", "Theta vs Phi -", 760, -190., 190., 400, 160., 180.);


  // settings
  Int_t EventInMass = 0;
  Float_t muonMass = 0.105658389;
//   Float_t UpsilonMass = 9.46037;
//   Float_t JPsiMass = 3.097;

  Double_t thetaX, thetaY, pYZ;
  Double_t fPxRec1, fPyRec1, fPzRec1, fE1;
  Double_t fPxRec2, fPyRec2, fPzRec2, fE2;
  Int_t fCharge, fCharge2;

  Int_t ntrackhits, nevents;
  Double_t fitfmin;

 
  TLorentzVector fV1, fV2, fVtot;

  // set off mag field 
  AliMagF::SetReadField(kFALSE);

  // open run loader and load gAlice, kinematics and header
  AliRunLoader* runLoader = AliRunLoader::Open(filename);
  if (!runLoader) {
    Error("MUONmass_ESD", "getting run loader from file %s failed", 
	    filename);
    return kFALSE;
  }

  if (!gAlice) {
    Error("MUONmass_ESD", "no galice object found");
    return kFALSE;
  }
  

  // open the ESD file
  TFile* esdFile = TFile::Open(esdFileName);
  if (!esdFile || !esdFile->IsOpen()) {
    Error("MUONmass_ESD", "opening ESD file %s failed", esdFileName);
    return kFALSE;
  }
  
  AliESD* esd = new AliESD();
  TTree* tree = (TTree*) esdFile->Get("esdTree");
  if (!tree) {
    Error("CheckESD", "no ESD tree found");
    return kFALSE;
  }
  tree->SetBranchAddress("ESD", &esd);

  runLoader->LoadHeader();
  nevents = runLoader->GetNumberOfEvents();
        
  // Loop over events
  for (Int_t iEvent = FirstEvent; iEvent <= TMath::Min(LastEvent, nevents - 1); iEvent++) {

    // get current event
    runLoader->GetEvent(iEvent);
   
    // get the event summary data
    tree->GetEvent(iEvent);
    if (!esd) {
      Error("CheckESD", "no ESD object found for event %d", iEvent);
      return kFALSE;
    }

    Int_t nTracks = (Int_t)esd->GetNumberOfMuonTracks() ; 

    //    printf("\n Nb of events analysed: %d\r",iEvent);
    //      cout << " number of tracks: " << nTracks  <<endl;
  
    // loop over all reconstructed tracks (also first track of combination)
    for (Int_t iTrack = 0; iTrack <  nTracks;  iTrack++) {

      AliESDMuonTrack* muonTrack = esd->GetMuonTrack(iTrack);

      thetaX = muonTrack->GetThetaX();
      thetaY = muonTrack->GetThetaY();

      pYZ     =  1./TMath::Abs(muonTrack->GetInverseBendingMomentum());
      fPzRec1  = - pYZ / TMath::Sqrt(1.0 + TMath::Tan(thetaY)*TMath::Tan(thetaY));
      fPxRec1  = fPzRec1 * TMath::Tan(thetaX);
      fPyRec1  = fPzRec1 * TMath::Tan(thetaY);
      fCharge = Int_t(TMath::Sign(1.,muonTrack->GetInverseBendingMomentum()));

      fE1 = TMath::Sqrt(muonMass * muonMass + fPxRec1 * fPxRec1 + fPyRec1 * fPyRec1 + fPzRec1 * fPzRec1);
      fV1.SetPxPyPzE(fPxRec1, fPyRec1, fPzRec1, fE1);

      ntrackhits = muonTrack->GetNHit();
      fitfmin    = muonTrack->GetChi2();

      // transverse momentum
      Float_t pt1 = fV1.Pt();

      // total momentum
      Float_t p1 = fV1.P();

      // Rapidity
      Float_t rapMuon1 = fV1.Rapidity();

      // chi2 per d.o.f.
      Float_t ch1 =  fitfmin / (2.0 * ntrackhits - 5);
//      printf(" px %f py %f pz %f NHits %d  Norm.chi2 %f charge %d\n", 
// 	     fPxRec1, fPyRec1, fPzRec1, ntrackhits, ch1, fCharge);

      // condition for good track (Chi2Cut and PtCut)

      if ((ch1 < Chi2Cut) && (pt1 > PtCutMin) && (pt1 < PtCutMax)) {

	// fill histos hPtMuon and hChi2PerDof
	hPtMuon->Fill(pt1);
	hPMuon->Fill(p1);
	hChi2PerDof->Fill(ch1);
	hRapMuon->Fill(rapMuon1);
	if (fCharge > 0) {
	  hPtMuonPlus->Fill(pt1);
	  hThetaPhiPlus->Fill(TMath::ATan2(fPyRec1,fPxRec1)*180./TMath::Pi(),TMath::ATan2(pt1,fPzRec1)*180./3.1415);
	} else {
	  hPtMuonMinus->Fill(pt1);
	  hThetaPhiMinus->Fill(TMath::ATan2(fPyRec1,fPxRec1)*180./TMath::Pi(),TMath::ATan2(pt1,fPzRec1)*180./3.1415);
	}
	// loop over second track of combination
	for (Int_t iTrack2 = iTrack + 1; iTrack2 < nTracks; iTrack2++) {
	  
	  AliESDMuonTrack* muonTrack = esd->GetMuonTrack(iTrack2);

	  thetaX = muonTrack->GetThetaX();
	  thetaY = muonTrack->GetThetaY();

	  pYZ     =  1./TMath::Abs(muonTrack->GetInverseBendingMomentum());
	  fPzRec2  = - pYZ / TMath::Sqrt(1.0 + TMath::Tan(thetaY)*TMath::Tan(thetaY));
	  fPxRec2  = fPzRec2 * TMath::Tan(thetaX);
	  fPyRec2  = fPzRec2 * TMath::Tan(thetaY);
	  fCharge2 = Int_t(TMath::Sign(1.,muonTrack->GetInverseBendingMomentum()));

	  fE2 = TMath::Sqrt(muonMass * muonMass + fPxRec2 * fPxRec2 + fPyRec2 * fPyRec2 + fPzRec2 * fPzRec2);
	  fV2.SetPxPyPzE(fPxRec2, fPyRec2, fPzRec2, fE2);

	  ntrackhits = muonTrack->GetNHit();
	  fitfmin    = muonTrack->GetChi2();

	  // transverse momentum
	  Float_t pt2 = fV2.Pt();

	  // chi2 per d.o.f.
	  Float_t ch2 = fitfmin  / (2.0 * ntrackhits - 5);

	  // condition for good track (Chi2Cut and PtCut)
	  if ((ch2 < Chi2Cut) && (pt2 > PtCutMin)  && (pt2 < PtCutMax)) {

	    // condition for opposite charges
	    if ((fCharge * fCharge2) == -1) {

	      // invariant mass
	      fVtot = fV1 + fV2;
	      Float_t invMass = fVtot.M();
	            
	      // fill histos hInvMassAll and hInvMassRes
	      hInvMassAll->Fill(invMass);
	      hInvMassRes->Fill(invMass);
	      hInvMassAll_vs_Pt->Fill(invMass,fVtot.Pt());
	      if (invMass > massMin && invMass < massMax) {
		EventInMass++;
  		hRapResonance->Fill(fVtot.Rapidity());
  		hPtResonance->Fill(fVtot.Pt());
	      }

	    } // if (fCharge * fCharge2) == -1)
	  } // if ((ch2 < Chi2Cut) && (pt2 > PtCutMin) && (pt2 < PtCutMax))
	} //  for (Int_t iTrack2 = iTrack + 1; iTrack2 < iTrack; iTrack2++)
      } // if (ch1 < Chi2Cut) && (pt1 > PtCutMin)&& (pt1 < PtCutMax) )
    } // for (Int_t iTrack = 0; iTrack < nrectracks; iTrack++)

    hNumberOfTrack->Fill(nTracks);
    //    esdFile->Delete();
  } // for (Int_t iEvent = FirstEvent;

// Loop over events for bg event

  Double_t thetaPlus,  phiPlus;
  Double_t thetaMinus, phiMinus;
  Float_t PtMinus, PtPlus;
  
  for (Int_t iEvent = 0; iEvent < hInvMassAll->Integral(); iEvent++) {

    hThetaPhiPlus->GetRandom2(phiPlus, thetaPlus);
    hThetaPhiMinus->GetRandom2(phiMinus,thetaMinus);
    PtPlus = hPtMuonPlus->GetRandom();
    PtMinus = hPtMuonMinus->GetRandom();

    fPxRec1  = PtPlus * TMath::Cos(TMath::Pi()/180.*phiPlus);
    fPyRec1  = PtPlus * TMath::Sin(TMath::Pi()/180.*phiPlus);
    fPzRec1  = PtPlus / TMath::Tan(TMath::Pi()/180.*thetaPlus);

    fE1 = TMath::Sqrt(muonMass * muonMass + fPxRec1 * fPxRec1 + fPyRec1 * fPyRec1 + fPzRec1 * fPzRec1);
    fV1.SetPxPyPzE(fPxRec1, fPyRec1, fPzRec1, fE1);

    fPxRec2  = PtMinus * TMath::Cos(TMath::Pi()/180.*phiMinus);
    fPyRec2  = PtMinus * TMath::Sin(TMath::Pi()/180.*phiMinus);
    fPzRec2  = PtMinus / TMath::Tan(TMath::Pi()/180.*thetaMinus);

    fE2 = TMath::Sqrt(muonMass * muonMass + fPxRec2 * fPxRec2 + fPyRec2 * fPyRec2 + fPzRec2 * fPzRec2);
    fV2.SetPxPyPzE(fPxRec2, fPyRec2, fPzRec2, fE2);

    // invariant mass
    fVtot = fV1 + fV2;
      
    // fill histos hInvMassAll and hInvMassRes
    hInvMassBg->Fill(fVtot.M());
    hInvMassBgk_vs_Pt->Fill( fVtot.M(), fVtot.Pt() );
  }

  histoFile->Write();
  histoFile->Close();

  cout << "MUONmassPlot " << endl;
  cout << "FirstEvent " << FirstEvent << endl;
  cout << "LastEvent " << LastEvent << endl;
  cout << "ResType " << ResType << endl;
  cout << "Chi2Cut " << Chi2Cut << endl;
  cout << "PtCutMin " << PtCutMin << endl;
  cout << "PtCutMax " << PtCutMax << endl;
  cout << "massMin " << massMin << endl;
  cout << "massMax " << massMax << endl;
  cout << "EventInMass " << EventInMass << endl;

  return kTRUE;
}
Commit	Line	Data
5473f16a	1	#if !defined(__CINT__) \|\| defined(__MAKECINT__)
5473f16a	2	// ROOT includes
48d6b312	3	#include "TTree.h"
5473f16a	4	#include "TBranch.h"
	5	#include "TClonesArray.h"
	6	#include "TLorentzVector.h"
	7	#include "TFile.h"
	8	#include "TH1.h"
ac3c5325	9	#include "TH2.h"
5473f16a	10	#include "TParticle.h"
	11	#include "TTree.h"
	12	#include <Riostream.h>
	13
	14	// STEER includes
	15	#include "AliRun.h"
	16	#include "AliRunLoader.h"
	17	#include "AliHeader.h"
	18	#include "AliLoader.h"
	19	#include "AliStack.h"
cb75342e	20	#include "AliMagF.h"
5473f16a	21	#include "AliESD.h"
	22
	23	// MUON includes
	24	#include "AliESDMuonTrack.h"
	25	#endif
	26	//
	27	// Macro MUONmassPlot.C for ESD
	28	// Ch. Finck, Subatech, April. 2004
	29	//
	30
	31	// macro to make invariant mass plots
	32	// for combinations of 2 muons with opposite charges,
	33	// from root file "MUON.tracks.root" containing the result of track reconstruction.
	34	// Histograms are stored on the "MUONmassPlot.root" file.
	35	// introducing TLorentzVector for parameter calculations (Pt, P,rap,etc...)
	36	// using Invariant Mass for rapidity.
	37
	38	// Arguments:
	39	// FirstEvent (default 0)
	40	// LastEvent (default 0)
	41	// ResType (default 553)
	42	// 553 for Upsilon, anything else for J/Psi
	43	// Chi2Cut (default 100)
	44	// to keep only tracks with chi2 per d.o.f. < Chi2Cut
	45	// PtCutMin (default 1)
	46	// to keep only tracks with transverse momentum > PtCutMin
	47	// PtCutMax (default 10000)
	48	// to keep only tracks with transverse momentum < PtCutMax
	49	// massMin (default 9.17 for Upsilon)
	50	// & massMax (default 9.77 for Upsilon)
	51	// to calculate the reconstruction efficiency for resonances with invariant mass
	52	// massMin < mass < massMax.
	53
	54	// Add parameters and histograms for analysis
	55
	56	Bool_t MUONmassPlot(char* filename = "galice.root", Int_t FirstEvent = 0, Int_t LastEvent = 10000,
	57	char* esdFileName = "AliESDs.root", Int_t ResType = 553,
	58	Float_t Chi2Cut = 100., Float_t PtCutMin = 1., Float_t PtCutMax = 10000.,
	59	Float_t massMin = 9.17,Float_t massMax = 9.77)
	60	{
	61	cout << "MUONmassPlot " << endl;
	62	cout << "FirstEvent " << FirstEvent << endl;
	63	cout << "LastEvent " << LastEvent << endl;
	64	cout << "ResType " << ResType << endl;
	65	cout << "Chi2Cut " << Chi2Cut << endl;
	66	cout << "PtCutMin " << PtCutMin << endl;
	67	cout << "PtCutMax " << PtCutMax << endl;
	68	cout << "massMin " << massMin << endl;
	69	cout << "massMax " << massMax << endl;
	70
	71
	72	//Reset ROOT and connect tree file
	73	gROOT->Reset();
	74
5473f16a	75	// File for histograms and histogram booking
	76	TFile *histoFile = new TFile("MUONmassPlot.root", "RECREATE");
	77	TH1F *hPtMuon = new TH1F("hPtMuon", "Muon Pt (GeV/c)", 100, 0., 20.);
ac3c5325	78	TH1F *hPtMuonPlus = new TH1F("hPtMuonPlus", "Muon+ Pt (GeV/c)", 100, 0., 20.);
ac3c5325	79	TH1F *hPtMuonMinus = new TH1F("hPtMuonMinus", "Muon- Pt (GeV/c)", 100, 0., 20.);
5473f16a	80	TH1F *hPMuon = new TH1F("hPMuon", "Muon P (GeV/c)", 100, 0., 200.);
	81	TH1F *hChi2PerDof = new TH1F("hChi2PerDof", "Muon track chi2/d.o.f.", 100, 0., 20.);
	82	TH1F *hInvMassAll = new TH1F("hInvMassAll", "Mu+Mu- invariant mass (GeV/c2)", 480, 0., 12.);
ac3c5325	83	TH1F *hInvMassBg = new TH1F("hInvMassBg", "Mu+Mu- invariant mass BG(GeV/c2)", 480, 0., 12.);
	84	TH2F *hInvMassAll_vs_Pt = new TH2F("hInvMassAll_vs_Pt","hInvMassAll_vs_Pt",480,0.,12.,80,0.,20.);
	85	TH2F *hInvMassBgk_vs_Pt = new TH2F("hInvMassBgk_vs_Pt","hInvMassBgk_vs_Pt",480,0.,12.,80,0.,20.);
	86	TH1F *hInvMassRes;
5473f16a	87
	88	if (ResType == 553) {
	89	hInvMassRes = new TH1F("hInvMassRes", "Mu+Mu- invariant mass (GeV/c2) around Upsilon", 60, 8., 11.);
	90	} else {
	91	hInvMassRes = new TH1F("hInvMassRes", "Mu+Mu- invariant mass (GeV/c2) around J/Psi", 80, 0., 5.);
	92	}
	93
	94	TH1F *hNumberOfTrack = new TH1F("hNumberOfTrack","nb of track /evt ",20,-0.5,19.5);
	95	TH1F *hRapMuon = new TH1F("hRapMuon"," Muon Rapidity",50,-4.5,-2);
	96	TH1F *hRapResonance = new TH1F("hRapResonance"," Resonance Rapidity",50,-4.5,-2);
	97	TH1F *hPtResonance = new TH1F("hPtResonance", "Resonance Pt (GeV/c)", 100, 0., 20.);
ac3c5325	98	TH2F *hThetaPhiPlus = new TH2F("hThetaPhiPlus", "Theta vs Phi +", 760, -190., 190., 400, 160., 180.);
ac3c5325	99	TH2F *hThetaPhiMinus = new TH2F("hThetaPhiMinus", "Theta vs Phi -", 760, -190., 190., 400, 160., 180.);
5473f16a	100
	101
	102	// settings
	103	Int_t EventInMass = 0;
	104	Float_t muonMass = 0.105658389;
	105	// Float_t UpsilonMass = 9.46037;
	106	// Float_t JPsiMass = 3.097;
	107
	108	Double_t thetaX, thetaY, pYZ;
	109	Double_t fPxRec1, fPyRec1, fPzRec1, fE1;
	110	Double_t fPxRec2, fPyRec2, fPzRec2, fE2;
	111	Int_t fCharge, fCharge2;
	112
	113	Int_t ntrackhits, nevents;
	114	Double_t fitfmin;
	115
	116
	117	TLorentzVector fV1, fV2, fVtot;
cb75342e	118
	119	// set off mag field
	120	AliMagF::SetReadField(kFALSE);
	121
5473f16a	122	// open run loader and load gAlice, kinematics and header
	123	AliRunLoader* runLoader = AliRunLoader::Open(filename);
	124	if (!runLoader) {
	125	Error("MUONmass_ESD", "getting run loader from file %s failed",
	126	filename);
	127	return kFALSE;
	128	}
	129
5473f16a	130	if (!gAlice) {
	131	Error("MUONmass_ESD", "no galice object found");
	132	return kFALSE;
	133	}
	134
	135
	136	// open the ESD file
	137	TFile* esdFile = TFile::Open(esdFileName);
	138	if (!esdFile \|\| !esdFile->IsOpen()) {
	139	Error("MUONmass_ESD", "opening ESD file %s failed", esdFileName);
	140	return kFALSE;
	141	}
	142
48d6b312	143	AliESD* esd = new AliESD();
	144	TTree* tree = (TTree*) esdFile->Get("esdTree");
	145	if (!tree) {
	146	Error("CheckESD", "no ESD tree found");
	147	return kFALSE;
	148	}
	149	tree->SetBranchAddress("ESD", &esd);
	150
5473f16a	151	runLoader->LoadHeader();
	152	nevents = runLoader->GetNumberOfEvents();
	153
	154	// Loop over events
	155	for (Int_t iEvent = FirstEvent; iEvent <= TMath::Min(LastEvent, nevents - 1); iEvent++) {
	156
	157	// get current event
	158	runLoader->GetEvent(iEvent);
48d6b312	159
5473f16a	160	// get the event summary data
48d6b312	161	tree->GetEvent(iEvent);
5473f16a	162	if (!esd) {
48d6b312	163	Error("CheckESD", "no ESD object found for event %d", iEvent);
5473f16a	164	return kFALSE;
	165	}
	166
48d6b312	167	Int_t nTracks = (Int_t)esd->GetNumberOfMuonTracks() ;
5473f16a	168
5473f16a	169	// printf("\n Nb of events analysed: %d\r",iEvent);
48d6b312	170	// cout << " number of tracks: " << nTracks <<endl;
5473f16a	171
	172	// loop over all reconstructed tracks (also first track of combination)
	173	for (Int_t iTrack = 0; iTrack < nTracks; iTrack++) {
	174
	175	AliESDMuonTrack* muonTrack = esd->GetMuonTrack(iTrack);
	176
	177	thetaX = muonTrack->GetThetaX();
	178	thetaY = muonTrack->GetThetaY();
	179
	180	pYZ = 1./TMath::Abs(muonTrack->GetInverseBendingMomentum());
d3c448a1	181	fPzRec1 = - pYZ / TMath::Sqrt(1.0 + TMath::Tan(thetaY)*TMath::Tan(thetaY));
5473f16a	182	fPxRec1 = fPzRec1 * TMath::Tan(thetaX);
	183	fPyRec1 = fPzRec1 * TMath::Tan(thetaY);
	184	fCharge = Int_t(TMath::Sign(1.,muonTrack->GetInverseBendingMomentum()));
	185
	186	fE1 = TMath::Sqrt(muonMass * muonMass + fPxRec1 * fPxRec1 + fPyRec1 * fPyRec1 + fPzRec1 * fPzRec1);
	187	fV1.SetPxPyPzE(fPxRec1, fPyRec1, fPzRec1, fE1);
	188
	189	ntrackhits = muonTrack->GetNHit();
	190	fitfmin = muonTrack->GetChi2();
	191
	192	// transverse momentum
	193	Float_t pt1 = fV1.Pt();
	194
	195	// total momentum
	196	Float_t p1 = fV1.P();
	197
	198	// Rapidity
	199	Float_t rapMuon1 = fV1.Rapidity();
	200
	201	// chi2 per d.o.f.
	202	Float_t ch1 = fitfmin / (2.0 * ntrackhits - 5);
	203	// printf(" px %f py %f pz %f NHits %d Norm.chi2 %f charge %d\n",
	204	// fPxRec1, fPyRec1, fPzRec1, ntrackhits, ch1, fCharge);
	205
	206	// condition for good track (Chi2Cut and PtCut)
	207
	208	if ((ch1 < Chi2Cut) && (pt1 > PtCutMin) && (pt1 < PtCutMax)) {
	209
	210	// fill histos hPtMuon and hChi2PerDof
	211	hPtMuon->Fill(pt1);
	212	hPMuon->Fill(p1);
	213	hChi2PerDof->Fill(ch1);
	214	hRapMuon->Fill(rapMuon1);
ac3c5325	215	if (fCharge > 0) {
	216	hPtMuonPlus->Fill(pt1);
	217	hThetaPhiPlus->Fill(TMath::ATan2(fPyRec1,fPxRec1)180./TMath::Pi(),TMath::ATan2(pt1,fPzRec1)180./3.1415);
	218	} else {
	219	hPtMuonMinus->Fill(pt1);
	220	hThetaPhiMinus->Fill(TMath::ATan2(fPyRec1,fPxRec1)180./TMath::Pi(),TMath::ATan2(pt1,fPzRec1)180./3.1415);
	221	}
5473f16a	222	// loop over second track of combination
	223	for (Int_t iTrack2 = iTrack + 1; iTrack2 < nTracks; iTrack2++) {
	224
	225	AliESDMuonTrack* muonTrack = esd->GetMuonTrack(iTrack2);
	226
	227	thetaX = muonTrack->GetThetaX();
	228	thetaY = muonTrack->GetThetaY();
	229
	230	pYZ = 1./TMath::Abs(muonTrack->GetInverseBendingMomentum());
d3c448a1	231	fPzRec2 = - pYZ / TMath::Sqrt(1.0 + TMath::Tan(thetaY)*TMath::Tan(thetaY));
5473f16a	232	fPxRec2 = fPzRec2 * TMath::Tan(thetaX);
	233	fPyRec2 = fPzRec2 * TMath::Tan(thetaY);
	234	fCharge2 = Int_t(TMath::Sign(1.,muonTrack->GetInverseBendingMomentum()));
	235
	236	fE2 = TMath::Sqrt(muonMass * muonMass + fPxRec2 * fPxRec2 + fPyRec2 * fPyRec2 + fPzRec2 * fPzRec2);
	237	fV2.SetPxPyPzE(fPxRec2, fPyRec2, fPzRec2, fE2);
	238
	239	ntrackhits = muonTrack->GetNHit();
	240	fitfmin = muonTrack->GetChi2();
	241
	242	// transverse momentum
	243	Float_t pt2 = fV2.Pt();
	244
	245	// chi2 per d.o.f.
	246	Float_t ch2 = fitfmin / (2.0 * ntrackhits - 5);
	247
	248	// condition for good track (Chi2Cut and PtCut)
	249	if ((ch2 < Chi2Cut) && (pt2 > PtCutMin) && (pt2 < PtCutMax)) {
	250
	251	// condition for opposite charges
	252	if ((fCharge * fCharge2) == -1) {
	253
	254	// invariant mass
	255	fVtot = fV1 + fV2;
	256	Float_t invMass = fVtot.M();
	257
	258	// fill histos hInvMassAll and hInvMassRes
	259	hInvMassAll->Fill(invMass);
	260	hInvMassRes->Fill(invMass);
ac3c5325	261	hInvMassAll_vs_Pt->Fill(invMass,fVtot.Pt());
5473f16a	262	if (invMass > massMin && invMass < massMax) {
	263	EventInMass++;
	264	hRapResonance->Fill(fVtot.Rapidity());
	265	hPtResonance->Fill(fVtot.Pt());
	266	}
	267
	268	} // if (fCharge * fCharge2) == -1)
	269	} // if ((ch2 < Chi2Cut) && (pt2 > PtCutMin) && (pt2 < PtCutMax))
	270	} // for (Int_t iTrack2 = iTrack + 1; iTrack2 < iTrack; iTrack2++)
	271	} // if (ch1 < Chi2Cut) && (pt1 > PtCutMin)&& (pt1 < PtCutMax) )
	272	} // for (Int_t iTrack = 0; iTrack < nrectracks; iTrack++)
	273
	274	hNumberOfTrack->Fill(nTracks);
48d6b312	275	// esdFile->Delete();
5473f16a	276	} // for (Int_t iEvent = FirstEvent;
5473f16a	277
ac3c5325	278	// Loop over events for bg event
	279
	280	Double_t thetaPlus, phiPlus;
	281	Double_t thetaMinus, phiMinus;
	282	Float_t PtMinus, PtPlus;
	283
	284	for (Int_t iEvent = 0; iEvent < hInvMassAll->Integral(); iEvent++) {
	285
	286	hThetaPhiPlus->GetRandom2(phiPlus, thetaPlus);
	287	hThetaPhiMinus->GetRandom2(phiMinus,thetaMinus);
	288	PtPlus = hPtMuonPlus->GetRandom();
	289	PtMinus = hPtMuonMinus->GetRandom();
	290
	291	fPxRec1 = PtPlus * TMath::Cos(TMath::Pi()/180.*phiPlus);
	292	fPyRec1 = PtPlus * TMath::Sin(TMath::Pi()/180.*phiPlus);
	293	fPzRec1 = PtPlus / TMath::Tan(TMath::Pi()/180.*thetaPlus);
	294
	295	fE1 = TMath::Sqrt(muonMass * muonMass + fPxRec1 * fPxRec1 + fPyRec1 * fPyRec1 + fPzRec1 * fPzRec1);
	296	fV1.SetPxPyPzE(fPxRec1, fPyRec1, fPzRec1, fE1);
	297
	298	fPxRec2 = PtMinus * TMath::Cos(TMath::Pi()/180.*phiMinus);
	299	fPyRec2 = PtMinus * TMath::Sin(TMath::Pi()/180.*phiMinus);
	300	fPzRec2 = PtMinus / TMath::Tan(TMath::Pi()/180.*thetaMinus);
	301
	302	fE2 = TMath::Sqrt(muonMass * muonMass + fPxRec2 * fPxRec2 + fPyRec2 * fPyRec2 + fPzRec2 * fPzRec2);
	303	fV2.SetPxPyPzE(fPxRec2, fPyRec2, fPzRec2, fE2);
	304
	305	// invariant mass
	306	fVtot = fV1 + fV2;
	307
	308	// fill histos hInvMassAll and hInvMassRes
	309	hInvMassBg->Fill(fVtot.M());
	310	hInvMassBgk_vs_Pt->Fill( fVtot.M(), fVtot.Pt() );
	311	}
	312
5473f16a	313	histoFile->Write();
	314	histoFile->Close();
	315
	316	cout << "MUONmassPlot " << endl;
	317	cout << "FirstEvent " << FirstEvent << endl;
	318	cout << "LastEvent " << LastEvent << endl;
	319	cout << "ResType " << ResType << endl;
	320	cout << "Chi2Cut " << Chi2Cut << endl;
	321	cout << "PtCutMin " << PtCutMin << endl;
	322	cout << "PtCutMax " << PtCutMax << endl;
	323	cout << "massMin " << massMin << endl;
	324	cout << "massMax " << massMax << endl;
	325	cout << "EventInMass " << EventInMass << endl;
	326
	327	return kTRUE;
	328	}
	329