[u/mrichter/AliRoot.git] / PWGGA / GammaConv / AliAODConversionMother.cxx

#include "AliAODConversionMother.h"
#include "AliKFConversionMother.h"
#include "AliKFParticle.h"


// Author D. Lohner (Daniel.Lohner@cern.ch)

using namespace std;

ClassImp(AliAODConversionMother)

AliAODConversionMother::AliAODConversionMother() :
AliAODConversionParticle(),
    fMCLabel(-1),
    fChi2(-1),
    fOpeningAngle(-1),
    fAlpha(-1),
    fWeight(1),
    fdcaBetweenPhotons(1),
    fdcaZPrimVtx(100),
    fdcaRPrimVtx(100),
    fQuality(0)
   
{
	fLabel[0] = -1;
	fLabel[1] = -1;
	fLabel[2] = 0;
   
   fProductionVtx[0]=0;
   fProductionVtx[1]=0;
   fProductionVtx[2]=0;
  
}

AliAODConversionMother::AliAODConversionMother(AliKFConversionMother *kf):
AliAODConversionParticle(),
fMCLabel(kf->GetMCLabel()),
fChi2(kf->GetChi2()),
fOpeningAngle(kf->GetOpeningAngle()),
fAlpha(kf->GetAlpha()),
fWeight(1),
fdcaBetweenPhotons(100),
fdcaZPrimVtx(100),
fdcaRPrimVtx(100),
fQuality(0)
{
    // Set 4momentu
    SetPxPyPzE(kf->GetPx(),kf->GetPy(),kf->GetPz(),kf->GetE());

   fProductionVtx[0]=0;
   fProductionVtx[1]=0;
   fProductionVtx[2]=0;
  
     //Set Decay Photon Labels
    fLabel[0]=kf->GetGammaLabel(0);
    fLabel[1]=kf->GetGammaLabel(1);
    fLabel[2]=0;
}

AliAODConversionMother::AliAODConversionMother(AliAODConversionPhoton *y1,AliAODConversionPhoton *y2):
AliAODConversionParticle(),
fMCLabel(-1),
fChi2(-1),
fOpeningAngle(-1),
fAlpha(-1),
fWeight(1),
fdcaBetweenPhotons(1),
fdcaZPrimVtx(100),
fdcaRPrimVtx(100),
fQuality(0)
{
    // Set 4momentum
    SetPxPyPzE(y1->Px()+y2->Px(),y1->Py()+y2->Py(),y1->Pz()+y2->Pz(),y1->E()+y2->E());

    // Calculate Opening Angle
    TVector3 v1(y1->Px(),y1->Py(),y1->Pz());
    TVector3 v2(y2->Px(),y2->Py(),y2->Pz());
    fOpeningAngle=v1.Angle(v2);
    fdcaBetweenPhotons = CalculateDistanceBetweenPhotons(y1,y2,fProductionVtx);
    DetermineMesonQuality(y1,y2);
    // Calculate Alpha
    if((y1->E()+y2->E()) != 0){
	fAlpha=TMath::Abs((y1->E()-y2->E())/(y1->E()+y2->E()));
    }

    // Set Chi2 to the mean chi2 of gammas
 //   fChi2=0.5*(y1->GetChi2perNDF()+y2->GetChi2perNDF());

    //Set Decay Photon Labels
    fLabel[0]=-1;
    fLabel[1]=-1;
    fLabel[2]=0;
}

AliAODConversionMother::~AliAODConversionMother() {
    // empty standard destructor
}

TParticle *AliAODConversionMother::GetMCParticle(AliStack *fMCStack){
    if(!fMCStack){AliError("MC Stack not defined");return 0x0;}

    if(fMCLabel>-1){
		return fMCStack->Particle(fMCLabel);
    }
    return 0x0;
}

Bool_t AliAODConversionMother::IsTrueMeson(AliStack *fMCStack,Int_t pdgcode){
    TParticle *part=GetMCParticle(fMCStack);

    if(part){
	// Check if it is a true photon
	if(part->GetPdgCode()==pdgcode){
	    return kTRUE;
	}
    }
    return kFALSE;
}

Float_t AliAODConversionMother::CalculateDistanceBetweenPhotons(AliAODConversionPhoton* y1, AliAODConversionPhoton* y2 , Double_t prodPoint[3]){

   TVector3 a(y1->GetConversionX(),y1->GetConversionY(),y1->GetConversionZ());
   TVector3 b(y1->GetPx(),y1->GetPy(),y1->GetPz());
   TVector3 c(y2->GetConversionX(),y2->GetConversionY(),y2->GetConversionZ());
   TVector3 d(y2->GetPx(),y2->GetPy(),y2->GetPz());
   
   TVector3 n = b.Cross(d);
   TVector3 nn = n.Unit();
   
   Double_t dist = 0;
   if (n.Mag() == 0){
      TVector3 e = a-c;
      if (d.Mag() != 0){
         dist = TMath::Abs((e.Cross(d)).Mag())/TMath::Abs(d.Mag());
      }
      prodPoint[0] = 0;
      prodPoint[1] = 0;
      prodPoint[2] = 0;
   } else {   
      dist = TMath::Abs(n.Dot(c-a))/TMath::Abs(n.Mag());
      Double_t lambda = (b.Dot(d) * (a-c).Dot(d) - d.Dot(d) * (a-c).Dot(b))/(b.Dot(b) * d.Dot(d) - TMath::Power(b.Dot(d),2));
      Double_t mu = ((a-c).Dot(d) * b.Dot(b) - (a-c).Dot(b) * b.Dot(d) )/(b.Dot(b) * d.Dot(d) - TMath::Power(b.Dot(d),2));
      
      TVector3 S1 = a + lambda* b;
      TVector3 S2 = c + mu* d;
      TVector3 Prod = S1 + 0.5*dist*(S2-S1).Unit();
      prodPoint[0] = Prod(0);
      prodPoint[1] = Prod(1);
      prodPoint[2] = Prod(2);
      
   }
   return dist;
}

///________________________________________________________________________
void AliAODConversionMother::CalculateDistanceOfClossetApproachToPrimVtx(const AliVVertex* primVertex){

   Double_t primCo[3] = {primVertex->GetX(),primVertex->GetY(),primVertex->GetZ()};

   Double_t absoluteP = TMath::Sqrt(TMath::Power(Px(),2) + TMath::Power(Py(),2) + TMath::Power(Pz(),2));   
   Double_t p[3] = {Px()/absoluteP,Py()/absoluteP,Pz()/absoluteP};
   Double_t CP[3];
   
   CP[0] =  fProductionVtx[0] - primCo[0];
   CP[1] =  fProductionVtx[1] - primCo[1];
   CP[2] =  fProductionVtx[2] - primCo[2];
   
   Double_t Lambda = - (CP[0]*p[0]+CP[1]*p[1]+CP[2]*p[2])/(p[0]*p[0]+p[1]*p[1]+p[2]*p[2]);
   
   Double_t S[3];
   S[0] = fProductionVtx[0] + p[0]*Lambda;
   S[1] = fProductionVtx[1] + p[1]*Lambda;
   S[2] = fProductionVtx[2] + p[2]*Lambda;
   
   fdcaRPrimVtx = TMath::Sqrt( TMath::Power(primCo[0]-S[0],2) + TMath::Power(primCo[1]-S[1],2));
   fdcaZPrimVtx = primCo[2]-S[2];
   
   
//    cout << "DCA z: " << dca[1] << "\t DCA r: " << dca[0] << "\t DCA 3d: " << TMath::Sqrt(dca[1]*dca[1] + dca[0]*dca[0]) << endl;
   
   
   return;
}

///________________________________________________________________________
void AliAODConversionMother::DetermineMesonQuality(AliAODConversionPhoton* y1, AliAODConversionPhoton* y2){
   UChar_t photonQA1 = y1->GetPhotonQuality();
   UChar_t photonQA2 = y2->GetPhotonQuality();
   
   if (photonQA1 == 0 || photonQA2 == 0){
      fQuality = 0;
      return;
   } 
   if (photonQA1 == 1 && photonQA2 == 1){
      fQuality = 1;
      return;
   }               
   if (photonQA1 == 2 && photonQA2 == 2){
      fQuality = 4;
      return;
   }               
   if (photonQA1 == 3 && photonQA2 == 3){
      fQuality = 6;
      return;
   }         
   if (photonQA1 == 1){
       if (photonQA2 == 2){
        fQuality = 2;  
        return;
       }
       if (photonQA2 == 3){
        fQuality = 3;  
        return;
       }
   }
   if (photonQA2 == 1){
       if (photonQA1 == 2){
        fQuality = 2;  
        return;
       }
       if (photonQA1 == 3){
        fQuality = 3;  
        return;
       }
   }
   if ((photonQA1 == 2 && photonQA2 == 3)|| (photonQA1 == 3 && photonQA2 == 2)){
        fQuality = 5;  
        return;
   }
   
}
Commit	Line	Data
2eedd4ed	1	#include "AliAODConversionMother.h"
	2	#include "AliKFConversionMother.h"
	3	#include "AliKFParticle.h"
	4
	5
	6	// Author D. Lohner (Daniel.Lohner@cern.ch)
	7
	8	using namespace std;
	9
	10	ClassImp(AliAODConversionMother)
	11
	12	AliAODConversionMother::AliAODConversionMother() :
	13	AliAODConversionParticle(),
92efd725	14	fMCLabel(-1),
	15	fChi2(-1),
	16	fOpeningAngle(-1),
69b05e50	17	fAlpha(-1),
4803eb1f	18	fWeight(1),
	19	fdcaBetweenPhotons(1),
	20	fdcaZPrimVtx(100),
	21	fdcaRPrimVtx(100),
	22	fQuality(0)
	23
2eedd4ed	24	{
fd420a4f	25	fLabel[0] = -1;
fd420a4f	26	fLabel[1] = -1;
92efd725	27	fLabel[2] = 0;
4803eb1f	28
	29	fProductionVtx[0]=0;
	30	fProductionVtx[1]=0;
	31	fProductionVtx[2]=0;
	32
2eedd4ed	33	}
	34
	35	AliAODConversionMother::AliAODConversionMother(AliKFConversionMother *kf):
	36	AliAODConversionParticle(),
92efd725	37	fMCLabel(kf->GetMCLabel()),
2eedd4ed	38	fChi2(kf->GetChi2()),
2eedd4ed	39	fOpeningAngle(kf->GetOpeningAngle()),
69b05e50	40	fAlpha(kf->GetAlpha()),
4803eb1f	41	fWeight(1),
	42	fdcaBetweenPhotons(100),
	43	fdcaZPrimVtx(100),
	44	fdcaRPrimVtx(100),
	45	fQuality(0)
2eedd4ed	46	{
	47	// Set 4momentu
	48	SetPxPyPzE(kf->GetPx(),kf->GetPy(),kf->GetPz(),kf->GetE());
	49
4803eb1f	50	fProductionVtx[0]=0;
	51	fProductionVtx[1]=0;
	52	fProductionVtx[2]=0;
	53
2eedd4ed	54	//Set Decay Photon Labels
	55	fLabel[0]=kf->GetGammaLabel(0);
	56	fLabel[1]=kf->GetGammaLabel(1);
92efd725	57	fLabel[2]=0;
2eedd4ed	58	}
	59
	60	AliAODConversionMother::AliAODConversionMother(AliAODConversionPhoton y1,AliAODConversionPhoton y2):
	61	AliAODConversionParticle(),
92efd725	62	fMCLabel(-1),
2eedd4ed	63	fChi2(-1),
2eedd4ed	64	fOpeningAngle(-1),
69b05e50	65	fAlpha(-1),
4803eb1f	66	fWeight(1),
	67	fdcaBetweenPhotons(1),
	68	fdcaZPrimVtx(100),
	69	fdcaRPrimVtx(100),
	70	fQuality(0)
2eedd4ed	71	{
	72	// Set 4momentum
	73	SetPxPyPzE(y1->Px()+y2->Px(),y1->Py()+y2->Py(),y1->Pz()+y2->Pz(),y1->E()+y2->E());
	74
	75	// Calculate Opening Angle
	76	TVector3 v1(y1->Px(),y1->Py(),y1->Pz());
	77	TVector3 v2(y2->Px(),y2->Py(),y2->Pz());
	78	fOpeningAngle=v1.Angle(v2);
4803eb1f	79	fdcaBetweenPhotons = CalculateDistanceBetweenPhotons(y1,y2,fProductionVtx);
4803eb1f	80	DetermineMesonQuality(y1,y2);
2eedd4ed	81	// Calculate Alpha
	82	if((y1->E()+y2->E()) != 0){
	83	fAlpha=TMath::Abs((y1->E()-y2->E())/(y1->E()+y2->E()));
	84	}
	85
	86	// Set Chi2 to the mean chi2 of gammas
3b77b2d1	87	// fChi2=0.5*(y1->GetChi2perNDF()+y2->GetChi2perNDF());
2eedd4ed	88
	89	//Set Decay Photon Labels
	90	fLabel[0]=-1;
	91	fLabel[1]=-1;
a280ac15	92	fLabel[2]=0;
2eedd4ed	93	}
	94
	95	AliAODConversionMother::~AliAODConversionMother() {
92efd725	96	// empty standard destructor
	97	}
	98
	99	TParticle AliAODConversionMother::GetMCParticle(AliStack fMCStack){
	100	if(!fMCStack){AliError("MC Stack not defined");return 0x0;}
2eedd4ed	101
92efd725	102	if(fMCLabel>-1){
	103	return fMCStack->Particle(fMCLabel);
	104	}
	105	return 0x0;
	106	}
	107
	108	Bool_t AliAODConversionMother::IsTrueMeson(AliStack *fMCStack,Int_t pdgcode){
	109	TParticle *part=GetMCParticle(fMCStack);
	110
	111	if(part){
	112	// Check if it is a true photon
	113	if(part->GetPdgCode()==pdgcode){
	114	return kTRUE;
	115	}
	116	}
	117	return kFALSE;
2eedd4ed	118	}
2eedd4ed	119
4803eb1f	120	Float_t AliAODConversionMother::CalculateDistanceBetweenPhotons(AliAODConversionPhoton* y1, AliAODConversionPhoton* y2 , Double_t prodPoint[3]){
	121
	122	TVector3 a(y1->GetConversionX(),y1->GetConversionY(),y1->GetConversionZ());
	123	TVector3 b(y1->GetPx(),y1->GetPy(),y1->GetPz());
	124	TVector3 c(y2->GetConversionX(),y2->GetConversionY(),y2->GetConversionZ());
	125	TVector3 d(y2->GetPx(),y2->GetPy(),y2->GetPz());
	126
	127	TVector3 n = b.Cross(d);
	128	TVector3 nn = n.Unit();
	129
	130	Double_t dist = 0;
	131	if (n.Mag() == 0){
	132	TVector3 e = a-c;
	133	if (d.Mag() != 0){
	134	dist = TMath::Abs((e.Cross(d)).Mag())/TMath::Abs(d.Mag());
	135	}
	136	prodPoint[0] = 0;
	137	prodPoint[1] = 0;
	138	prodPoint[2] = 0;
	139	} else {
	140	dist = TMath::Abs(n.Dot(c-a))/TMath::Abs(n.Mag());
	141	Double_t lambda = (b.Dot(d) * (a-c).Dot(d) - d.Dot(d) * (a-c).Dot(b))/(b.Dot(b) * d.Dot(d) - TMath::Power(b.Dot(d),2));
	142	Double_t mu = ((a-c).Dot(d) * b.Dot(b) - (a-c).Dot(b) * b.Dot(d) )/(b.Dot(b) * d.Dot(d) - TMath::Power(b.Dot(d),2));
	143
	144	TVector3 S1 = a + lambda* b;
	145	TVector3 S2 = c + mu* d;
	146	TVector3 Prod = S1 + 0.5dist(S2-S1).Unit();
	147	prodPoint[0] = Prod(0);
	148	prodPoint[1] = Prod(1);
	149	prodPoint[2] = Prod(2);
	150
	151	}
	152	return dist;
	153	}
	154
	155	///________________________________________________________________________
	156	void AliAODConversionMother::CalculateDistanceOfClossetApproachToPrimVtx(const AliVVertex* primVertex){
	157
	158	Double_t primCo[3] = {primVertex->GetX(),primVertex->GetY(),primVertex->GetZ()};
	159
	160	Double_t absoluteP = TMath::Sqrt(TMath::Power(Px(),2) + TMath::Power(Py(),2) + TMath::Power(Pz(),2));
	161	Double_t p[3] = {Px()/absoluteP,Py()/absoluteP,Pz()/absoluteP};
	162	Double_t CP[3];
	163
	164	CP[0] = fProductionVtx[0] - primCo[0];
	165	CP[1] = fProductionVtx[1] - primCo[1];
	166	CP[2] = fProductionVtx[2] - primCo[2];
	167
	168	Double_t Lambda = - (CP[0]p[0]+CP[1]p[1]+CP[2]p[2])/(p[0]p[0]+p[1]p[1]+p[2]p[2]);
	169
	170	Double_t S[3];
	171	S[0] = fProductionVtx[0] + p[0]*Lambda;
	172	S[1] = fProductionVtx[1] + p[1]*Lambda;
	173	S[2] = fProductionVtx[2] + p[2]*Lambda;
	174
	175	fdcaRPrimVtx = TMath::Sqrt( TMath::Power(primCo[0]-S[0],2) + TMath::Power(primCo[1]-S[1],2));
	176	fdcaZPrimVtx = primCo[2]-S[2];
	177
	178
	179	// cout << "DCA z: " << dca[1] << "\t DCA r: " << dca[0] << "\t DCA 3d: " << TMath::Sqrt(dca[1]dca[1] + dca[0]dca[0]) << endl;
	180
	181
	182	return;
	183	}
184
185	///________________________________________________________________________
186	void AliAODConversionMother::DetermineMesonQuality(AliAODConversionPhoton* y1, AliAODConversionPhoton* y2){
187	UChar_t photonQA1 = y1->GetPhotonQuality();
188	UChar_t photonQA2 = y2->GetPhotonQuality();
189
190	if (photonQA1 == 0 \|\| photonQA2 == 0){
191	fQuality = 0;
192	return;
193	}
194	if (photonQA1 == 1 && photonQA2 == 1){
195	fQuality = 1;
196	return;
197	}
198	if (photonQA1 == 2 && photonQA2 == 2){
199	fQuality = 4;
200	return;
201	}
202	if (photonQA1 == 3 && photonQA2 == 3){
203	fQuality = 6;
204	return;
205	}
206	if (photonQA1 == 1){
207	if (photonQA2 == 2){
208	fQuality = 2;
209	return;
210	}
211	if (photonQA2 == 3){
212	fQuality = 3;
213	return;
214	}
215	}
216	if (photonQA2 == 1){
217	if (photonQA1 == 2){
218	fQuality = 2;
219	return;
220	}
221	if (photonQA1 == 3){
222	fQuality = 3;
223	return;
224	}
225	}
226	if ((photonQA1 == 2 && photonQA2 == 3)\|\| (photonQA1 == 3 && photonQA2 == 2)){
227	fQuality = 5;
228	return;
229	}
230
231	}