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

#if !defined(__CINT__) || defined(__MAKECINT__)
// ROOT includes
#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 "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;
  
  // 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;
  }

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