[u/mrichter/AliRoot.git] / MUON / AliMUONPairLight.cxx

/**************************************************************************
 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 *      SigmaEffect_thetadegrees                                                                  *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpeateose. It is      *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/

/* $Id$ */

//===================================================================
//This class was prepared by INFN Cagliari, July 2006
//(authors: H.Woehri, A.de Falco)
// 
// Compact information for the generated muon pairs in the MUON arm 
// useful at the last stage of the analysis chain
// Pairs are built with two AliMUONTrackLight objects 
// Using the class AliMUONTrackLight this class combines the decay
// information ("history") of the reconstructed tracks and fills
// a series of flags for the formed reconstructed dimuon:
// fIsCorrelated, fCreationProcess, fIsFeedDown, ...
// for information about the dimuon, use PrintInfo with the appropriate
// printflag
// To be used together with AliMUONTrackLight
//===================================================================


//MUON classes
#include "AliMUONPairLight.h"
//Root classes
#include "TString.h"

ClassImp(AliMUONPairLight) 

//====================================
AliMUONPairLight::AliMUONPairLight() : 
  TObject(), 
  fMu0(),
  fMu1(), 
  fCreationProcess(-999),
  fIsCorrelated(kFALSE), 
  fCauseOfCorrelation (-1),
  fIsFeedDown(kFALSE)
{
  /// default constructor
  ; 
}

//====================================

AliMUONPairLight::AliMUONPairLight(AliMUONPairLight &dimuCopy) 
  : TObject(dimuCopy),
    fMu0(dimuCopy.fMu0),
    fMu1(dimuCopy.fMu1), 
    fCreationProcess(dimuCopy.fCreationProcess),
    fIsCorrelated(dimuCopy.fIsCorrelated), 
    fCauseOfCorrelation (dimuCopy.fCauseOfCorrelation),
    fIsFeedDown(dimuCopy.fIsFeedDown)
{ 
/// copy constructor
///   fMu0 = AliMUONTrackLight(dimuCopy.fMu0); 
///   fMu1 = AliMUONTrackLight(dimuCopy.fMu1); 
///   fIsCorrelated = dimuCopy.fIsCorrelated;
///   fCauseOfCorrelation = dimuCopy.fCauseOfCorrelation;
///   fCreationProcess = dimuCopy.fCreationProcess;
///   fIsFeedDown = dimuCopy.fIsFeedDown;
  ;
}

//====================================

AliMUONPairLight::~AliMUONPairLight(){
  /// destructor
}

//====================================

Bool_t AliMUONPairLight::IsAResonance(){
  /// checks if muon pair comes from a resonance decay  
  if (!fIsCorrelated) return kFALSE;   //if muons not correlated, cannot be a resonance
  //if muons are correlated, check if the PDG of the
  //common mother is a resonance
  Int_t nparents0 = fMu0.GetNParents(); 
  Int_t nparents1 = fMu1.GetNParents(); 

  Int_t minP = TMath::Min(nparents0, nparents1);
  for (Int_t i = 0 ; i < minP; i++) { 
    if (fMu0.IsMotherAResonance(nparents0-1-i) && fMu1.IsMotherAResonance(nparents1-1-i) && 
	fMu0.GetParentPythiaLine(nparents0-1-i)==fMu1.GetParentPythiaLine(nparents1-1-i)) {
      if (nparents0-1-i) SetFeedDown(nparents0-1-i);
      return kTRUE;
    }
  }
  return kFALSE; 
}

//====================================

AliMUONTrackLight* AliMUONPairLight::GetMuon(Int_t index)  { 
  /// return muon 0 or 1
   if (index==0) return &fMu0;
   else if (index==1) return &fMu1; 
   else{ printf ("Index can be either 0 or 1\n"); return 0;}
   //   else return &fMu1; 
}

//====================================

Int_t AliMUONPairLight::GetMuonMotherPDG(Int_t imuon, Int_t mother) { 
  /// return muon mother pdg code
  if (imuon==0) return fMu0.GetParentPDGCode(mother); 
  else if (imuon==1) return fMu1.GetParentPDGCode(mother); 
  else { printf ("Index must be only 0 or 1\n"); return -999; } 
}

//====================================
void AliMUONPairLight::SetProcess(){
  /// finds the process related to the muon pair (open charm/beauty, resonance, 
  /// uncorrelated...) 

  AliMUONTrackLight *mu1 = &fMu0;
  AliMUONTrackLight *mu2 = &fMu1;

  // check if the two muons are correlated
  // first check if they come from the same hadron (resonance or beauty/charm meson)
  Int_t npar1 = mu1->GetNParents(); 
  Int_t npar2 = mu2->GetNParents(); 
  for (Int_t imoth1 = npar1-1; imoth1>=0; imoth1--) { 
    Int_t lineMo1 = mu1->GetParentPythiaLine(imoth1);
    for (Int_t imoth2 = npar2-1; imoth2>=0; imoth2--) { 
      Int_t lineMo2 = mu2->GetParentPythiaLine(imoth2);
      if(lineMo1 == lineMo2) { 
	//reject "diquark" mothers
	if(mu1->IsDiquark(mu1->GetParentPDGCode(imoth1)))return;
// 	if(IsDiquark(mu1->GetParentPDGCode(imoth1))) return;
	this->SetCorrelated(kTRUE); 
	this->SetCauseOfCorrelation(mu1->GetParentPDGCode(imoth1));
	if(!IsAResonance()) fCreationProcess = 3; 
	else fCreationProcess = -1;
	return;
      }
    }
  }  
  // if Open Beauty/Charm we can have 3 creation processes 
  // (pair creation [0], gluon splitting [1] or flavour excitation [2])
  // 1.) gluon splitting: gluon (stored with index 2, id=21) must be the same 
  Int_t flavPar1 = mu1->GetParentFlavour(0);
  Int_t flavPar2 = mu2->GetParentFlavour(0);
  for (Int_t imoth1 = 0; imoth1 < 4; imoth1++) { 
    Int_t lineMo1 = mu1->GetQuarkPythiaLine(imoth1);
    for (Int_t imoth2 = 0; imoth2 < 4; imoth2++) { 
      Int_t lineMo2 = mu2->GetQuarkPythiaLine(imoth2);
      if(lineMo1 == lineMo2 && mu1->GetQuarkPDGCode(imoth1) == 21) {
	//now, check also that the string fragmented into two hadrons
	//of the same flavour (string usually splits into many hadrons
	//among which there are mostly soft particles)
	if(flavPar1 == flavPar2){
	  this->SetCorrelated(kTRUE); 
	  if(GetCauseOfCorrelation() == -1)
	    this->SetCauseOfCorrelation(mu1->GetQuarkPDGCode(imoth1));

	  fCreationProcess = 1; 
	  return;
	}
      }
    }
  }
  Int_t line1 = mu1->GetQuarkPythiaLine(2); //[2] ... very first quark
  Int_t line2 = mu2->GetQuarkPythiaLine(2); 

  Int_t line6or7[2] = {-1, -1}; //holds the index of quark in line 6 or 7
  Int_t flavourLine6or7[2] = {-1, -1};
  // 2.) pair creation: if pythia line 6 of one track *and* pythia line 7 of second track
  // are filled with a Q and Qbar
  for (Int_t imoth1 = 3; imoth1>=0; imoth1--) { 
    Int_t lineMo1 = mu1->GetQuarkPythiaLine(imoth1);
    Int_t flavour1 = TMath::Abs(mu1->GetQuarkPDGCode(imoth1));
    if(lineMo1 == 6 || lineMo1 == 7){ //track 0 has a mother in line 6 or 7
      line6or7[0] = imoth1;
      flavourLine6or7[0] = flavour1;
    }
    for (Int_t imoth2 = 3; imoth2>=0; imoth2--) { 
      Int_t lineMo2 = mu2->GetQuarkPythiaLine(imoth2);
      Int_t flavour2 = TMath::Abs(mu2->GetQuarkPDGCode(imoth2));
      if(lineMo2 == 6 || lineMo2 == 7){ //track 1 has a mother in line 6 or 7
	line6or7[1] = imoth2;
	flavourLine6or7[1] = flavour2;
      }
      if((line6or7[0] > 0 && line6or7[1] > 0) && //both tracks must have an entry in line 6 or 7
	 (flavourLine6or7[0] == 4 || flavourLine6or7[0] == 5) && //this entry must be a c or b quark
	 (flavourLine6or7[1] == 4 || flavourLine6or7[1] == 5) && // == " ==
	 (flavPar1 == flavPar2)){ //make sure that the first hadronised parents of the 2 tracks are of the same flavour 
	this->SetCorrelated(kTRUE);
	fCreationProcess = 0; 
	return;
      }
    }
  }


  // 3.)flavour excitation:
  Int_t line2or3[2] = {-1, -1}; //holds the index of g/q in line 2 or 3
  Int_t flavourLine2or3[2] = {-1, -1};
  for (Int_t imoth1 = 3; imoth1>=0; imoth1--) { 
    Int_t lineMo1 = mu1->GetQuarkPythiaLine(imoth1);
    Int_t flavour1 = TMath::Abs(mu1->GetQuarkPDGCode(imoth1));
    if(lineMo1 == 2 || lineMo1 == 3){ //track 0 has a mother in line 2 or 3
      line2or3[0] = imoth1;
      flavourLine2or3[0] = flavour1;
    }
    for (Int_t imoth2 = 3; imoth2>=0; imoth2--) { 
      Int_t lineMo2 = mu2->GetQuarkPythiaLine(imoth2);
      Int_t flavour2 = TMath::Abs(mu2->GetQuarkPDGCode(imoth2));
      if(lineMo2 == 2 || lineMo2 == 3){ //track 1 has a mother in line 2 or 3
	line2or3[1] = imoth2;
	flavourLine2or3[1] = flavour2;
      }
      if(((line6or7[0] > 0 && (flavourLine6or7[0] == 4  || flavourLine6or7[0] == 5)) && //first track has Q in line 6 or 7
	  (line2or3[1] > 0 && (flavourLine2or3[1] == 21 || flavourLine2or3[1] < 10))) || //second track has a g/q in line 2 or 3
	 ((line6or7[1] > 0 && (flavourLine6or7[1] == 4 || flavourLine6or7[1] == 5)) &&  //or the same,
	  (line2or3[0] > 0 && (flavourLine2or3[0] == 21 || flavourLine2or3[0] < 10)))){ // swapping the track's indices
	//now, check also that the string fragmented into two hadrons
	//of the same flavour (string usually splits into many hadrons
	//among which there are mostly soft particles)
	if(flavPar1 == flavPar2){
	  this->SetCorrelated(kTRUE);
	  fCreationProcess = 2;
	  return;
	}
      }
    }
  } 

  //now flag (rare) processes in which only the incoming parton in line 2 or 3
  //radiates a gluon which produces a QQbar pair:
  //exclude the light quarks
  if(line1 == line2 && (line1 == 2 || line1 == 3)){
    if((TMath::Abs(mu1->GetQuarkPDGCode(1)) == 4 && TMath::Abs(mu2->GetQuarkPDGCode(1)) == 4) ||
       (TMath::Abs(mu1->GetQuarkPDGCode(1)) == 5 && TMath::Abs(mu2->GetQuarkPDGCode(1)) == 5)){

      //now, check also that the string fragmented into two hadrons
      //of the same flavour (string usually splits into many hadrons
      //among which there are mostly soft particles)
      if(flavPar1 == flavPar2){

	this->SetCorrelated(kTRUE);
	fCreationProcess = 1;
	if(GetCauseOfCorrelation() == -1){
	  this->SetCauseOfCorrelation(mu1->GetQuarkPDGCode(1));
	}
	return;
      }
    }
  }
}

//====================================
void AliMUONPairLight::SetMuons(AliMUONTrackLight mu0, AliMUONTrackLight mu1){
  /// set the two muons 
  fMu0 = mu0; 
  fMu1 = mu1; 
  this->SetProcess();
} 

//====================================
void AliMUONPairLight::PrintInfo(Option_t* opt){
  /// print information about muon pairs
  /// Options: 
  /// - "H" single muons' decay histories
  /// - "K" dimuon kinematics
  /// - "F" dimuon flags
  /// - "A" all variables
  TString options(opt);
  options.ToUpper();

  if(options.Contains("H") || options.Contains("A")){//muon decay histories

    AliMUONTrackLight *mu1 = &fMu0;
    AliMUONTrackLight *mu2 = &fMu1;

    printf("========= History =======================\n");
    printf("first muon");
    mu1->PrintInfo("H");
    printf("second muon");
    mu2->PrintInfo("H");
    printf("=========================================\n");
  }
  if(options.Contains("F") || options.Contains("A")){//flags
    printf("the flags set for this muon pair are:\n");
    printf("=====================================\n");
    if(this->IsOneTrackNotAMuon()) printf("(*) one rec. track is not a muon\n");
    fIsCorrelated ? printf("(*) it is a correlated pair\n") : printf("(*) it is not a correlated pair\n");
    if(IsOpenCharm()) printf("(*) correlated open charm: ");
    if(IsOpenBeauty()) printf("(*) correlated open beauty: ");
    if(IsOpenCharm() || IsOpenBeauty()){
      switch(fCreationProcess){
      case 0:
	printf("pair creation");
	break;
      case 1:
	printf("gluon splitting");
	break;
      case 2:
	printf("flavour excitation");
	break;
      case 3:
	printf("both muons come from same fragmented mother");
	break;
      }
      if(this->GetMuon(0)->GetOscillation() || this->GetMuon(1)->GetOscillation()) 
	printf("... where oscillation occured\n");
      else{
	if(IsOpenBeauty())
	  printf(" (no oscillation)\n");
	else
	  printf("\n");
      }
    }
    IsAResonance() ? printf("(*) it is a resonance: %d\n", this->GetMuonMotherPDG(0, fIsFeedDown)) : printf("(*) it is not a resonance\n");
    fIsFeedDown ? printf("(*) mother has feed-down: %d --> %d\n", this->GetMuonMotherPDG(0,fMu0.GetNParents()-2), this->GetMuonMotherPDG(0,fMu0.GetNParents()-1)) : printf("(*) no feed-down\n");
    printf("=====================================\n");
  }
  if(options.Contains("K") || options.Contains("A")){//dimuon kinematics
    Double_t *vtx = this->GetMuon(0)->GetVertex();
    TLorentzVector momRec = this->GetPRec();
    TLorentzVector momGen = this->GetPGen();
    printf("the dimuon charge is %d\n", this->GetCharge());
    printf("primary Vertex: Vx = %1.3f, Vy = %1.3f, Vz = %1.3f\n", vtx[0], vtx[1], vtx[2]);
    printf("Generated:     Px = %1.3f, Py = %1.3f, Pz = %1.3f\n", momGen.Px(), momGen.Py(), momGen.Pz());
    printf("Reconstructed: Px = %1.3f, Py = %1.3f, Pz = %1.3f\n", momRec.Px(), momRec.Py(), momRec.Pz());
    //rapidity, pT, angles, ...
    printf("Rec. variables: pT %1.3f, pseudo-rapidity %1.3f, openingAngle %1.3f (%1.3f degree), theta %1.3f (%1.3f degree), phi %1.3f (%1.3f degree)\n", 
	   momRec.Pt(), momRec.Eta(), 
	   TMath::Pi()/180.*this->GetOpeningAngle(), this->GetOpeningAngle(), 
	   momRec.Theta(), 180./TMath::Pi() * momRec.Theta(), 
	   momRec.Phi(), 180./TMath::Pi() * momRec.Phi());
  }
}

//====================================
Double_t AliMUONPairLight::GetOpeningAngle() { 
  /// opening angle between the two muons in the lab frame (in degrees)
  TLorentzVector pRecMu0 =  fMu0.GetPRec();
  TLorentzVector pRecMu1 =  fMu1.GetPRec();
  TVector3 pRecMu03 = pRecMu0.Vect();
  TVector3 pRecMu13 = pRecMu1.Vect();
  Double_t scalar = pRecMu03.Dot(pRecMu13);
  Double_t modMu0 = pRecMu03.Mag();
  Double_t modMu1 = pRecMu13.Mag();
  Double_t theta = (TMath::ACos(scalar/(modMu0*modMu1)))*(180./TMath::Pi());
  return theta; 
}
Commit	Line	Data
55fd51b0	1	/**************************************************************************
	2	* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
	3	* SigmaEffect_thetadegrees *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpeateose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
	15
	16	/* $Id$ */
	17
	18	//===================================================================
	19	//This class was prepared by INFN Cagliari, July 2006
	20	//(authors: H.Woehri, A.de Falco)
	21	//
	22	// Compact information for the generated muon pairs in the MUON arm
	23	// useful at the last stage of the analysis chain
	24	// Pairs are built with two AliMUONTrackLight objects
	25	// Using the class AliMUONTrackLight this class combines the decay
	26	// information ("history") of the reconstructed tracks and fills
	27	// a series of flags for the formed reconstructed dimuon:
	28	// fIsCorrelated, fCreationProcess, fIsFeedDown, ...
	29	// for information about the dimuon, use PrintInfo with the appropriate
	30	// printflag
	31	// To be used together with AliMUONTrackLight
	32	//===================================================================
	33
	34
	35	//MUON classes
	36	#include "AliMUONPairLight.h"
	37	//Root classes
	38	#include "TString.h"
	39
	40	ClassImp(AliMUONPairLight)
	41
	42	//====================================
	43	AliMUONPairLight::AliMUONPairLight() :
	44	TObject(),
	45	fMu0(),
	46	fMu1(),
	47	fCreationProcess(-999),
	48	fIsCorrelated(kFALSE),
	49	fCauseOfCorrelation (-1),
	50	fIsFeedDown(kFALSE)
	51	{
	52	/// default constructor
	53	;
	54	}
	55
	56	//====================================
	57
	58	AliMUONPairLight::AliMUONPairLight(AliMUONPairLight &dimuCopy)
	59	: TObject(dimuCopy),
	60	fMu0(dimuCopy.fMu0),
0060b2f7	61	fMu1(dimuCopy.fMu1),
55fd51b0	62	fCreationProcess(dimuCopy.fCreationProcess),
	63	fIsCorrelated(dimuCopy.fIsCorrelated),
	64	fCauseOfCorrelation (dimuCopy.fCauseOfCorrelation),
	65	fIsFeedDown(dimuCopy.fIsFeedDown)
	66	{
	67	/// copy constructor
	68	/// fMu0 = AliMUONTrackLight(dimuCopy.fMu0);
	69	/// fMu1 = AliMUONTrackLight(dimuCopy.fMu1);
	70	/// fIsCorrelated = dimuCopy.fIsCorrelated;
	71	/// fCauseOfCorrelation = dimuCopy.fCauseOfCorrelation;
	72	/// fCreationProcess = dimuCopy.fCreationProcess;
	73	/// fIsFeedDown = dimuCopy.fIsFeedDown;
	74	;
	75	}
	76
	77	//====================================
	78
	79	AliMUONPairLight::~AliMUONPairLight(){
	80	/// destructor
	81	}
	82
	83	//====================================
	84
	85	Bool_t AliMUONPairLight::IsAResonance(){
	86	/// checks if muon pair comes from a resonance decay
	87	if (!fIsCorrelated) return kFALSE; //if muons not correlated, cannot be a resonance
	88	//if muons are correlated, check if the PDG of the
	89	//common mother is a resonance
b88403f3	90	Int_t nparents0 = fMu0.GetNParents();
b88403f3	91	Int_t nparents1 = fMu1.GetNParents();
55fd51b0	92
b88403f3	93	Int_t minP = TMath::Min(nparents0, nparents1);
	94	for (Int_t i = 0 ; i < minP; i++) {
	95	if (fMu0.IsMotherAResonance(nparents0-1-i) && fMu1.IsMotherAResonance(nparents1-1-i) &&
	96	fMu0.GetParentPythiaLine(nparents0-1-i)==fMu1.GetParentPythiaLine(nparents1-1-i)) {
	97	if (nparents0-1-i) SetFeedDown(nparents0-1-i);
	98	return kTRUE;
	99	}
	100	}
	101	return kFALSE;
55fd51b0	102	}
	103
	104	//====================================
	105
	106	AliMUONTrackLight* AliMUONPairLight::GetMuon(Int_t index) {
	107	/// return muon 0 or 1
	108	if (index==0) return &fMu0;
	109	else if (index==1) return &fMu1;
	110	else{ printf ("Index can be either 0 or 1\n"); return 0;}
	111	// else return &fMu1;
	112	}
	113
	114	//====================================
	115
	116	Int_t AliMUONPairLight::GetMuonMotherPDG(Int_t imuon, Int_t mother) {
	117	/// return muon mother pdg code
	118	if (imuon==0) return fMu0.GetParentPDGCode(mother);
	119	else if (imuon==1) return fMu1.GetParentPDGCode(mother);
	120	else { printf ("Index must be only 0 or 1\n"); return -999; }
	121	}
	122
	123	//====================================
	124	void AliMUONPairLight::SetProcess(){
	125	/// finds the process related to the muon pair (open charm/beauty, resonance,
	126	/// uncorrelated...)
b88403f3	127
55fd51b0	128	AliMUONTrackLight *mu1 = &fMu0;
	129	AliMUONTrackLight *mu2 = &fMu1;
	130
55fd51b0	131	// check if the two muons are correlated
	132	// first check if they come from the same hadron (resonance or beauty/charm meson)
	133	Int_t npar1 = mu1->GetNParents();
	134	Int_t npar2 = mu2->GetNParents();
55fd51b0	135	for (Int_t imoth1 = npar1-1; imoth1>=0; imoth1--) {
55fd51b0	136	Int_t lineMo1 = mu1->GetParentPythiaLine(imoth1);
55fd51b0	137	for (Int_t imoth2 = npar2-1; imoth2>=0; imoth2--) {
	138	Int_t lineMo2 = mu2->GetParentPythiaLine(imoth2);
	139	if(lineMo1 == lineMo2) {
b88403f3	140	//reject "diquark" mothers
	141	if(mu1->IsDiquark(mu1->GetParentPDGCode(imoth1)))return;
	142	// if(IsDiquark(mu1->GetParentPDGCode(imoth1))) return;
55fd51b0	143	this->SetCorrelated(kTRUE);
	144	this->SetCauseOfCorrelation(mu1->GetParentPDGCode(imoth1));
	145	if(!IsAResonance()) fCreationProcess = 3;
	146	else fCreationProcess = -1;
b88403f3	147	return;
55fd51b0	148	}
	149	}
	150	}
55fd51b0	151	// if Open Beauty/Charm we can have 3 creation processes
55fd51b0	152	// (pair creation [0], gluon splitting [1] or flavour excitation [2])
55fd51b0	153	// 1.) gluon splitting: gluon (stored with index 2, id=21) must be the same
b88403f3	154	Int_t flavPar1 = mu1->GetParentFlavour(0);
	155	Int_t flavPar2 = mu2->GetParentFlavour(0);
	156	for (Int_t imoth1 = 0; imoth1 < 4; imoth1++) {
	157	Int_t lineMo1 = mu1->GetQuarkPythiaLine(imoth1);
	158	for (Int_t imoth2 = 0; imoth2 < 4; imoth2++) {
	159	Int_t lineMo2 = mu2->GetQuarkPythiaLine(imoth2);
	160	if(lineMo1 == lineMo2 && mu1->GetQuarkPDGCode(imoth1) == 21) {
	161	//now, check also that the string fragmented into two hadrons
	162	//of the same flavour (string usually splits into many hadrons
	163	//among which there are mostly soft particles)
	164	if(flavPar1 == flavPar2){
	165	this->SetCorrelated(kTRUE);
	166	if(GetCauseOfCorrelation() == -1)
	167	this->SetCauseOfCorrelation(mu1->GetQuarkPDGCode(imoth1));
	168
	169	fCreationProcess = 1;
	170	return;
	171	}
	172	}
55fd51b0	173	}
55fd51b0	174	}
55fd51b0	175	Int_t line1 = mu1->GetQuarkPythiaLine(2); //[2] ... very first quark
55fd51b0	176	Int_t line2 = mu2->GetQuarkPythiaLine(2);
b88403f3	177
	178	Int_t line6or7[2] = {-1, -1}; //holds the index of quark in line 6 or 7
	179	Int_t flavourLine6or7[2] = {-1, -1};
	180	// 2.) pair creation: if pythia line 6 of one track and pythia line 7 of second track
	181	// are filled with a Q and Qbar
	182	for (Int_t imoth1 = 3; imoth1>=0; imoth1--) {
	183	Int_t lineMo1 = mu1->GetQuarkPythiaLine(imoth1);
	184	Int_t flavour1 = TMath::Abs(mu1->GetQuarkPDGCode(imoth1));
	185	if(lineMo1 == 6 \|\| lineMo1 == 7){ //track 0 has a mother in line 6 or 7
	186	line6or7[0] = imoth1;
	187	flavourLine6or7[0] = flavour1;
	188	}
	189	for (Int_t imoth2 = 3; imoth2>=0; imoth2--) {
	190	Int_t lineMo2 = mu2->GetQuarkPythiaLine(imoth2);
	191	Int_t flavour2 = TMath::Abs(mu2->GetQuarkPDGCode(imoth2));
	192	if(lineMo2 == 6 \|\| lineMo2 == 7){ //track 1 has a mother in line 6 or 7
	193	line6or7[1] = imoth2;
	194	flavourLine6or7[1] = flavour2;
	195	}
	196	if((line6or7[0] > 0 && line6or7[1] > 0) && //both tracks must have an entry in line 6 or 7
	197	(flavourLine6or7[0] == 4 \|\| flavourLine6or7[0] == 5) && //this entry must be a c or b quark
	198	(flavourLine6or7[1] == 4 \|\| flavourLine6or7[1] == 5) && // == " ==
	199	(flavPar1 == flavPar2)){ //make sure that the first hadronised parents of the 2 tracks are of the same flavour
	200	this->SetCorrelated(kTRUE);
	201	fCreationProcess = 0;
	202	return;
	203	}
55fd51b0	204	}
	205	}
	206
b88403f3	207
55fd51b0	208	// 3.)flavour excitation:
b88403f3	209	Int_t line2or3[2] = {-1, -1}; //holds the index of g/q in line 2 or 3
	210	Int_t flavourLine2or3[2] = {-1, -1};
	211	for (Int_t imoth1 = 3; imoth1>=0; imoth1--) {
	212	Int_t lineMo1 = mu1->GetQuarkPythiaLine(imoth1);
	213	Int_t flavour1 = TMath::Abs(mu1->GetQuarkPDGCode(imoth1));
	214	if(lineMo1 == 2 \|\| lineMo1 == 3){ //track 0 has a mother in line 2 or 3
	215	line2or3[0] = imoth1;
	216	flavourLine2or3[0] = flavour1;
	217	}
	218	for (Int_t imoth2 = 3; imoth2>=0; imoth2--) {
	219	Int_t lineMo2 = mu2->GetQuarkPythiaLine(imoth2);
	220	Int_t flavour2 = TMath::Abs(mu2->GetQuarkPDGCode(imoth2));
	221	if(lineMo2 == 2 \|\| lineMo2 == 3){ //track 1 has a mother in line 2 or 3
	222	line2or3[1] = imoth2;
	223	flavourLine2or3[1] = flavour2;
	224	}
	225	if(((line6or7[0] > 0 && (flavourLine6or7[0] == 4 \|\| flavourLine6or7[0] == 5)) && //first track has Q in line 6 or 7
	226	(line2or3[1] > 0 && (flavourLine2or3[1] == 21 \|\| flavourLine2or3[1] < 10))) \|\| //second track has a g/q in line 2 or 3
	227	((line6or7[1] > 0 && (flavourLine6or7[1] == 4 \|\| flavourLine6or7[1] == 5)) && //or the same,
	228	(line2or3[0] > 0 && (flavourLine2or3[0] == 21 \|\| flavourLine2or3[0] < 10)))){ // swapping the track's indices
	229	//now, check also that the string fragmented into two hadrons
	230	//of the same flavour (string usually splits into many hadrons
	231	//among which there are mostly soft particles)
	232	if(flavPar1 == flavPar2){
	233	this->SetCorrelated(kTRUE);
	234	fCreationProcess = 2;
	235	return;
	236	}
	237	}
	238	}
	239	}
	240
	241	//now flag (rare) processes in which only the incoming parton in line 2 or 3
	242	//radiates a gluon which produces a QQbar pair:
	243	//exclude the light quarks
	244	if(line1 == line2 && (line1 == 2 \|\| line1 == 3)){
	245	if((TMath::Abs(mu1->GetQuarkPDGCode(1)) == 4 && TMath::Abs(mu2->GetQuarkPDGCode(1)) == 4) \|\|
	246	(TMath::Abs(mu1->GetQuarkPDGCode(1)) == 5 && TMath::Abs(mu2->GetQuarkPDGCode(1)) == 5)){
	247
	248	//now, check also that the string fragmented into two hadrons
	249	//of the same flavour (string usually splits into many hadrons
	250	//among which there are mostly soft particles)
	251	if(flavPar1 == flavPar2){
	252
	253	this->SetCorrelated(kTRUE);
	254	fCreationProcess = 1;
	255	if(GetCauseOfCorrelation() == -1){
	256	this->SetCauseOfCorrelation(mu1->GetQuarkPDGCode(1));
	257	}
	258	return;
	259	}
	260	}
55fd51b0	261	}
	262	}
	263
	264	//====================================
	265	void AliMUONPairLight::SetMuons(AliMUONTrackLight mu0, AliMUONTrackLight mu1){
	266	/// set the two muons
	267	fMu0 = mu0;
	268	fMu1 = mu1;
	269	this->SetProcess();
	270	}
	271
	272	//====================================
	273	void AliMUONPairLight::PrintInfo(Option_t* opt){
	274	/// print information about muon pairs
	275	/// Options:
	276	/// - "H" single muons' decay histories
	277	/// - "K" dimuon kinematics
	278	/// - "F" dimuon flags
	279	/// - "A" all variables
	280	TString options(opt);
	281	options.ToUpper();
	282
	283	if(options.Contains("H") \|\| options.Contains("A")){//muon decay histories
	284
	285	AliMUONTrackLight *mu1 = &fMu0;
	286	AliMUONTrackLight *mu2 = &fMu1;
	287
	288	printf("========= History =======================\n");
	289	printf("first muon");
	290	mu1->PrintInfo("H");
	291	printf("second muon");
	292	mu2->PrintInfo("H");
	293	printf("=========================================\n");
	294	}
	295	if(options.Contains("F") \|\| options.Contains("A")){//flags
	296	printf("the flags set for this muon pair are:\n");
	297	printf("=====================================\n");
	298	if(this->IsOneTrackNotAMuon()) printf("(*) one rec. track is not a muon\n");
	299	fIsCorrelated ? printf("() it is a correlated pair\n") : printf("() it is not a correlated pair\n");
	300	if(IsOpenCharm()) printf("(*) correlated open charm: ");
	301	if(IsOpenBeauty()) printf("(*) correlated open beauty: ");
	302	if(IsOpenCharm() \|\| IsOpenBeauty()){
	303	switch(fCreationProcess){
	304	case 0:
	305	printf("pair creation");
	306	break;
	307	case 1:
	308	printf("gluon splitting");
	309	break;
	310	case 2:
	311	printf("flavour excitation");
	312	break;
	313	case 3:
	314	printf("both muons come from same fragmented mother");
	315	break;
	316	}
	317	if(this->GetMuon(0)->GetOscillation() \|\| this->GetMuon(1)->GetOscillation())
	318	printf("... where oscillation occured\n");
	319	else{
	320	if(IsOpenBeauty())
	321	printf(" (no oscillation)\n");
	322	else
	323	printf("\n");
	324	}
325	}
b88403f3	326	IsAResonance() ? printf("() it is a resonance: %d\n", this->GetMuonMotherPDG(0, fIsFeedDown)) : printf("() it is not a resonance\n");
b88403f3	327	fIsFeedDown ? printf("() mother has feed-down: %d --> %d\n", this->GetMuonMotherPDG(0,fMu0.GetNParents()-2), this->GetMuonMotherPDG(0,fMu0.GetNParents()-1)) : printf("() no feed-down\n");
55fd51b0	328	printf("=====================================\n");
	329	}
	330	if(options.Contains("K") \|\| options.Contains("A")){//dimuon kinematics
	331	Double_t *vtx = this->GetMuon(0)->GetVertex();
	332	TLorentzVector momRec = this->GetPRec();
	333	TLorentzVector momGen = this->GetPGen();
	334	printf("the dimuon charge is %d\n", this->GetCharge());
	335	printf("primary Vertex: Vx = %1.3f, Vy = %1.3f, Vz = %1.3f\n", vtx[0], vtx[1], vtx[2]);
	336	printf("Generated: Px = %1.3f, Py = %1.3f, Pz = %1.3f\n", momGen.Px(), momGen.Py(), momGen.Pz());
	337	printf("Reconstructed: Px = %1.3f, Py = %1.3f, Pz = %1.3f\n", momRec.Px(), momRec.Py(), momRec.Pz());
	338	//rapidity, pT, angles, ...
	339	printf("Rec. variables: pT %1.3f, pseudo-rapidity %1.3f, openingAngle %1.3f (%1.3f degree), theta %1.3f (%1.3f degree), phi %1.3f (%1.3f degree)\n",
	340	momRec.Pt(), momRec.Eta(),
	341	TMath::Pi()/180.*this->GetOpeningAngle(), this->GetOpeningAngle(),
	342	momRec.Theta(), 180./TMath::Pi() * momRec.Theta(),
	343	momRec.Phi(), 180./TMath::Pi() * momRec.Phi());
	344	}
	345	}
	346
b88403f3	347	//====================================
55fd51b0	348	Double_t AliMUONPairLight::GetOpeningAngle() {
b88403f3	349	/// opening angle between the two muons in the lab frame (in degrees)
55fd51b0	350	TLorentzVector pRecMu0 = fMu0.GetPRec();
	351	TLorentzVector pRecMu1 = fMu1.GetPRec();
	352	TVector3 pRecMu03 = pRecMu0.Vect();
	353	TVector3 pRecMu13 = pRecMu1.Vect();
	354	Double_t scalar = pRecMu03.Dot(pRecMu13);
	355	Double_t modMu0 = pRecMu03.Mag();
	356	Double_t modMu1 = pRecMu13.Mag();
	357	Double_t theta = (TMath::ACos(scalar/(modMu0modMu1)))(180./TMath::Pi());
	358	return theta;
	359	}