[u/mrichter/AliRoot.git] / EVGEN / DimuonCombinator.cxx

//
//
//
//
#include "DimuonCombinator.h" 
#include "AliRun.h" 
#include "TRandom.h" 
//
ClassImp(DimuonCombinator)
//
//                       Iterators
// 
 GParticle* DimuonCombinator::FirstMuon()
     {
	 fimuon1=fimin1;
	 fmuon1 = (GParticle*) fPartArray->UncheckedAt(fimuon1);
	 while(Type(fmuon1)!=5 && Type(fmuon1)!=6) {
	     fimuon1++;
	     if (fimuon1 >= fimax1) {fmuon1=0; break;}
	     fmuon1 = (GParticle*) fPartArray->UncheckedAt(fimuon1);
	 }
	 return fmuon1;
     }
	     
 GParticle* DimuonCombinator::FirstMuonSelected()
     {
	 GParticle * muon=FirstMuon();
	 while(muon!=0 && !Selected(muon)) {muon=NextMuon();}
	 return muon;
     }
	     

 GParticle* DimuonCombinator::NextMuon()
     {
	 fimuon1++;
	 if (fimuon1>=fNParticle) {fmuon1 = 0; return fmuon1;}
	 
	 fmuon1 = (GParticle*) fPartArray->UncheckedAt(fimuon1);
	 while(Type(fmuon1)!=5 && Type(fmuon1)!=6) {
	     fimuon1++;
	     if (fimuon1>=fimax1) {fmuon1 = 0; break;}
	     fmuon1 = (GParticle*) fPartArray->UncheckedAt(fimuon1);
	 }
	 return fmuon1;
     }

GParticle* DimuonCombinator::NextMuonSelected()
     {
	 GParticle * muon=NextMuon();
	 while(muon !=0 && !Selected(muon)) {muon=NextMuon();}
	 return muon;
     }


 void DimuonCombinator::FirstPartner()
     {
	 if (fimin1==fimin2) {
	     fimuon2=fimuon1+1;
	 } else {
	     fimuon2=fimin2;
	 }
	 if (fimuon2 >= fimax2) {fmuon2=0; return;}
	 fmuon2 = (GParticle*) fPartArray->UncheckedAt(fimuon2);
	 while(Type(fmuon2)!=5 && Type(fmuon2)!=6) {
	     fimuon2++;
	     if (fimuon2 >= fimax2) {fmuon2=0; break;}
	     fmuon2 = (GParticle*) fPartArray->UncheckedAt(fimuon2);
	 }
     }
void DimuonCombinator::FirstPartnerSelected()
{
	 FirstPartner();
	 while(fmuon2 !=0 && !Selected(fmuon2)) {NextPartner();}
}


 void DimuonCombinator::NextPartner()
     {
	 fimuon2++;
	 if (fimuon2>=fimax2) {fmuon2 = 0; return;}

	 
	 fmuon2 = (GParticle*) fPartArray->UncheckedAt(fimuon2);

	 while(Type(fmuon2)!=5 && Type(fmuon2)!=6) {
	     fimuon2++;
	     if (fimuon2>=fimax2) {fmuon2 = 0; break;}
	     fmuon2 = (GParticle*) fPartArray->UncheckedAt(fimuon2);
	 }

     }

void DimuonCombinator::NextPartnerSelected()
{
	 NextPartner();
	 while(fmuon2 !=0 && !Selected(fmuon2)) {NextPartner();}
}


 GParticle*  DimuonCombinator::Partner()
     {
	 return fmuon2;
     }

void DimuonCombinator::FirstMuonPair(GParticle* & muon1, GParticle* & muon2)
     {
	 FirstMuon();
	 FirstPartner();
	 muon1=fmuon1;
	 muon2=fmuon2;	 
     }
void DimuonCombinator::NextMuonPair(GParticle* & muon1, GParticle* & muon2)
     {
	 NextPartner();
	 if (!Partner()) {
	     NextMuon();
	     FirstPartner();
	 }
	 muon1=fmuon1;
	 muon2=fmuon2;	 
     }
void DimuonCombinator::FirstMuonPairSelected(GParticle* & muon1, GParticle* & muon2)
     {
	 FirstMuonSelected();
	 FirstPartnerSelected();
	 muon1=fmuon1;
	 muon2=fmuon2;	 
     }
void DimuonCombinator::NextMuonPairSelected(GParticle* & muon1, GParticle* & muon2)
     {
	 NextPartnerSelected();
	 if (!Partner()) {
	     NextMuonSelected();
	     FirstPartnerSelected();
	 }
	 muon1=fmuon1;
	 muon2=fmuon2;	 
     }
void DimuonCombinator::ResetRange()
{
    fimin1=fimin2=0;
    fimax1=fimax2=fNParticle;
}

void DimuonCombinator::SetFirstRange(Int_t from, Int_t to)
{
    fimin1=from;
    fimax1=to;
    if (fimax1 > fNParticle) fimax1=fNParticle;
}

void DimuonCombinator::SetSecondRange(Int_t from, Int_t to)
{
    fimin2=from;
    fimax2=to;
    if (fimax2 > fNParticle) fimax2=fNParticle;
}
//
//                       Selection
//

Bool_t DimuonCombinator::Selected(GParticle* part)
{
// 
//
    if (part==0) {return 0;}
    
    if (part->GetPT() > fPtMin && part->GetEta()>fEtaMin && part->GetEta()<fEtaMax) {
	return 1;
    } else {
	return 0;
    }
    
    
}

Bool_t DimuonCombinator::Selected(GParticle* part1, GParticle* part2)
{
     return Selected(part1)*Selected(part2);
}
//
//                       Kinematics
//
Float_t DimuonCombinator::Mass(GParticle* part1, GParticle* part2)
{
    Float_t px,py,pz,e;
    px=part1->GetPx()+part2->GetPx();
    py=part1->GetPy()+part2->GetPy();
    pz=part1->GetPz()+part2->GetPz();    
    e =part1->GetEnergy()+part2->GetEnergy();
    Float_t p=px*px+py*py+pz*pz;
    if (e*e < p) {
	return -1; 
    } else {
	return TMath::Sqrt(e*e-p);
    }
}

Float_t DimuonCombinator::PT(GParticle* part1, GParticle* part2)
{
    Float_t px,py;
    px=part1->GetPx()+part2->GetPx();
    py=part1->GetPy()+part2->GetPy();
    return TMath::Sqrt(px*px+py*py);
}

Float_t DimuonCombinator::Pz(GParticle* part1, GParticle* part2)
{
    return part1->GetPz()+part2->GetPz();
}

Float_t DimuonCombinator::Y(GParticle* part1, GParticle* part2)
{
    Float_t pz,e;
    pz=part1->GetPz()+part2->GetPz();
    e =part1->GetEnergy()+part2->GetEnergy();
    return 0.5*TMath::Log((e+pz)/(e-pz));
}
//                  Response
//
void DimuonCombinator::SmearGauss(Float_t width, Float_t & value)
{
    value+=gRandom->Gaus(0, width);
}
//              Weighting
// 

Float_t DimuonCombinator::Decay_Prob(GParticle* part)
{
    Float_t d, h, theta, CTau;
    GParticle* parent = Parent(part);
    Int_t ipar=Type(parent);
    if (ipar==8 || ipar==9) {
	CTau=780.4;
    } else if (ipar==11 || ipar==12) {
	CTau=370.9;
    } else {
	CTau=0;
    }
    
    
    Float_t GammaBeta=(parent->GetMomentum())/(parent->GetMass());
//
// this part is still very ALICE muon-arm specific
//
    theta=parent->GetTheta();
    h=90*TMath::Tan(theta);
    
    if (h<4) {
	d=4/TMath::Sin(theta);
    } else {
	d=90/TMath::Cos(theta);
    }
    
    if (CTau > 0) {
	return 1-TMath::Exp(-d/CTau/GammaBeta);
    } else {
	return 1;
    }
}

Float_t DimuonCombinator::Weight(GParticle* part1, GParticle* part2)
{
    Float_t wgt=(part1->GetWgt())*(part2->GetWgt());
    
    if (Correlated(part1, part2)) {
	return wgt/(Parent(part1)->GetWgt())*fRate1;
    } else {
	return wgt*fRate1*fRate2;
    }
} 


Float_t DimuonCombinator::Weight(GParticle* part)
{
    return (part->GetWgt())*(Parent(part)->GetWgt())*fRate1;
}
Bool_t  DimuonCombinator::Correlated(GParticle* part1, GParticle* part2)
{
    if (Origin(part1) == Origin(part2)) {
	return kTRUE;
    } else {
	return kFALSE;
    }
}
GParticle* DimuonCombinator::Parent(GParticle* part)
{
    return (GParticle*) (fPartArray->UncheckedAt(part->GetParent()));
}

Int_t DimuonCombinator::Origin(GParticle* part)
{
    Int_t iparent= part->GetParent();
    if (iparent < 0) return iparent;
    Int_t ip;
    while(1) {
	ip=((GParticle*) fPartArray->UncheckedAt(iparent))->GetParent();
	if (ip < 0) {
	    break;
	} else {
	    iparent=ip;
	}
    }
    return iparent;
}
Commit	Line	Data
fe4da5cc	1	//
	2	//
	3	//
	4	//
	5	#include "DimuonCombinator.h"
	6	#include "AliRun.h"
	7	#include "TRandom.h"
	8	//
	9	ClassImp(DimuonCombinator)
	10	//
	11	// Iterators
	12	//
	13	GParticle* DimuonCombinator::FirstMuon()
	14	{
	15	fimuon1=fimin1;
	16	fmuon1 = (GParticle*) fPartArray->UncheckedAt(fimuon1);
	17	while(Type(fmuon1)!=5 && Type(fmuon1)!=6) {
	18	fimuon1++;
	19	if (fimuon1 >= fimax1) {fmuon1=0; break;}
	20	fmuon1 = (GParticle*) fPartArray->UncheckedAt(fimuon1);
	21	}
	22	return fmuon1;
	23	}
	24
	25	GParticle* DimuonCombinator::FirstMuonSelected()
	26	{
	27	GParticle * muon=FirstMuon();
	28	while(muon!=0 && !Selected(muon)) {muon=NextMuon();}
	29	return muon;
	30	}
	31
	32
	33	GParticle* DimuonCombinator::NextMuon()
	34	{
	35	fimuon1++;
	36	if (fimuon1>=fNParticle) {fmuon1 = 0; return fmuon1;}
	37
	38	fmuon1 = (GParticle*) fPartArray->UncheckedAt(fimuon1);
	39	while(Type(fmuon1)!=5 && Type(fmuon1)!=6) {
	40	fimuon1++;
	41	if (fimuon1>=fimax1) {fmuon1 = 0; break;}
	42	fmuon1 = (GParticle*) fPartArray->UncheckedAt(fimuon1);
	43	}
	44	return fmuon1;
	45	}
	46
	47	GParticle* DimuonCombinator::NextMuonSelected()
	48	{
	49	GParticle * muon=NextMuon();
	50	while(muon !=0 && !Selected(muon)) {muon=NextMuon();}
	51	return muon;
	52	}
	53
	54
	55	void DimuonCombinator::FirstPartner()
	56	{
	57	if (fimin1==fimin2) {
	58	fimuon2=fimuon1+1;
	59	} else {
	60	fimuon2=fimin2;
	61	}
	62	if (fimuon2 >= fimax2) {fmuon2=0; return;}
	63	fmuon2 = (GParticle*) fPartArray->UncheckedAt(fimuon2);
	64	while(Type(fmuon2)!=5 && Type(fmuon2)!=6) {
65	fimuon2++;
66	if (fimuon2 >= fimax2) {fmuon2=0; break;}
67	fmuon2 = (GParticle*) fPartArray->UncheckedAt(fimuon2);
68	}
69	}
70	void DimuonCombinator::FirstPartnerSelected()
71	{
72	FirstPartner();
73	while(fmuon2 !=0 && !Selected(fmuon2)) {NextPartner();}
74	}
75
76
77	void DimuonCombinator::NextPartner()
78	{
79	fimuon2++;
80	if (fimuon2>=fimax2) {fmuon2 = 0; return;}
81
82
83	fmuon2 = (GParticle*) fPartArray->UncheckedAt(fimuon2);
84
85	while(Type(fmuon2)!=5 && Type(fmuon2)!=6) {
86	fimuon2++;
87	if (fimuon2>=fimax2) {fmuon2 = 0; break;}
88	fmuon2 = (GParticle*) fPartArray->UncheckedAt(fimuon2);
89	}
90
91	}
92
93	void DimuonCombinator::NextPartnerSelected()
94	{
95	NextPartner();
96	while(fmuon2 !=0 && !Selected(fmuon2)) {NextPartner();}
97	}
98
99
100	GParticle* DimuonCombinator::Partner()
101	{
102	return fmuon2;
103	}
104
105	void DimuonCombinator::FirstMuonPair(GParticle* & muon1, GParticle* & muon2)
106	{
107	FirstMuon();
108	FirstPartner();
109	muon1=fmuon1;
110	muon2=fmuon2;
111	}
112	void DimuonCombinator::NextMuonPair(GParticle* & muon1, GParticle* & muon2)
113	{
114	NextPartner();
115	if (!Partner()) {
116	NextMuon();
117	FirstPartner();
118	}
119	muon1=fmuon1;
120	muon2=fmuon2;
121	}
122	void DimuonCombinator::FirstMuonPairSelected(GParticle* & muon1, GParticle* & muon2)
123	{
124	FirstMuonSelected();
125	FirstPartnerSelected();
126	muon1=fmuon1;
127	muon2=fmuon2;
128	}
129	void DimuonCombinator::NextMuonPairSelected(GParticle* & muon1, GParticle* & muon2)
130	{
131	NextPartnerSelected();
132	if (!Partner()) {
133	NextMuonSelected();
134	FirstPartnerSelected();
135	}
136	muon1=fmuon1;
137	muon2=fmuon2;
138	}
139	void DimuonCombinator::ResetRange()
140	{
141	fimin1=fimin2=0;
142	fimax1=fimax2=fNParticle;
143	}
144
145	void DimuonCombinator::SetFirstRange(Int_t from, Int_t to)
146	{
147	fimin1=from;
148	fimax1=to;
149	if (fimax1 > fNParticle) fimax1=fNParticle;
150	}
151
152	void DimuonCombinator::SetSecondRange(Int_t from, Int_t to)
153	{
154	fimin2=from;
155	fimax2=to;
156	if (fimax2 > fNParticle) fimax2=fNParticle;
157	}
158	//
159	// Selection
160	//
161
7d566a7d	162	Bool_t DimuonCombinator::Selected(GParticle* part)
fe4da5cc	163	{
	164	//
	165	//
	166	if (part==0) {return 0;}
	167
	168	if (part->GetPT() > fPtMin && part->GetEta()>fEtaMin && part->GetEta()<fEtaMax) {
	169	return 1;
	170	} else {
	171	return 0;
	172	}
	173
	174
	175	}
	176
7d566a7d	177	Bool_t DimuonCombinator::Selected(GParticle* part1, GParticle* part2)
fe4da5cc	178	{
	179	return Selected(part1)*Selected(part2);
	180	}
	181	//
	182	// Kinematics
	183	//
	184	Float_t DimuonCombinator::Mass(GParticle* part1, GParticle* part2)
	185	{
	186	Float_t px,py,pz,e;
	187	px=part1->GetPx()+part2->GetPx();
	188	py=part1->GetPy()+part2->GetPy();
	189	pz=part1->GetPz()+part2->GetPz();
	190	e =part1->GetEnergy()+part2->GetEnergy();
	191	Float_t p=pxpx+pypy+pz*pz;
	192	if (e*e < p) {
	193	return -1;
	194	} else {
	195	return TMath::Sqrt(e*e-p);
	196	}
	197	}
	198
	199	Float_t DimuonCombinator::PT(GParticle* part1, GParticle* part2)
	200	{
	201	Float_t px,py;
	202	px=part1->GetPx()+part2->GetPx();
	203	py=part1->GetPy()+part2->GetPy();
	204	return TMath::Sqrt(pxpx+pypy);
	205	}
	206
	207	Float_t DimuonCombinator::Pz(GParticle* part1, GParticle* part2)
	208	{
	209	return part1->GetPz()+part2->GetPz();
	210	}
	211
	212	Float_t DimuonCombinator::Y(GParticle* part1, GParticle* part2)
	213	{
	214	Float_t pz,e;
	215	pz=part1->GetPz()+part2->GetPz();
	216	e =part1->GetEnergy()+part2->GetEnergy();
	217	return 0.5*TMath::Log((e+pz)/(e-pz));
	218	}
	219	// Response
	220	//
	221	void DimuonCombinator::SmearGauss(Float_t width, Float_t & value)
	222	{
	223	value+=gRandom->Gaus(0, width);
	224	}
	225	// Weighting
	226	//
	227
7d566a7d	228	Float_t DimuonCombinator::Decay_Prob(GParticle* part)
fe4da5cc	229	{
7d566a7d	230	Float_t d, h, theta, CTau;
	231	GParticle* parent = Parent(part);
	232	Int_t ipar=Type(parent);
	233	if (ipar==8 \|\| ipar==9) {
	234	CTau=780.4;
	235	} else if (ipar==11 \|\| ipar==12) {
	236	CTau=370.9;
	237	} else {
	238	CTau=0;
	239	}
	240
	241
	242	Float_t GammaBeta=(parent->GetMomentum())/(parent->GetMass());
	243	//
	244	// this part is still very ALICE muon-arm specific
	245	//
	246	theta=parent->GetTheta();
	247	h=90*TMath::Tan(theta);
	248
	249	if (h<4) {
	250	d=4/TMath::Sin(theta);
fe4da5cc	251	} else {
7d566a7d	252	d=90/TMath::Cos(theta);
	253	}
	254
	255	if (CTau > 0) {
	256	return 1-TMath::Exp(-d/CTau/GammaBeta);
	257	} else {
	258	return 1;
fe4da5cc	259	}
	260	}
	261
7d566a7d	262	Float_t DimuonCombinator::Weight(GParticle* part1, GParticle* part2)
	263	{
	264	Float_t wgt=(part1->GetWgt())*(part2->GetWgt());
	265
	266	if (Correlated(part1, part2)) {
	267	return wgt/(Parent(part1)->GetWgt())*fRate1;
	268	} else {
	269	return wgtfRate1fRate2;
	270	}
	271	}
	272
	273
fe4da5cc	274	Float_t DimuonCombinator::Weight(GParticle* part)
fe4da5cc	275	{
7d566a7d	276	return (part->GetWgt())(Parent(part)->GetWgt())fRate1;
	277	}
	278	Bool_t DimuonCombinator::Correlated(GParticle* part1, GParticle* part2)
	279	{
	280	if (Origin(part1) == Origin(part2)) {
	281	return kTRUE;
	282	} else {
	283	return kFALSE;
	284	}
	285	}
	286	GParticle* DimuonCombinator::Parent(GParticle* part)
	287	{
	288	return (GParticle*) (fPartArray->UncheckedAt(part->GetParent()));
	289	}
	290
	291	Int_t DimuonCombinator::Origin(GParticle* part)
	292	{
	293	Int_t iparent= part->GetParent();
	294	if (iparent < 0) return iparent;
	295	Int_t ip;
	296	while(1) {
	297	ip=((GParticle*) fPartArray->UncheckedAt(iparent))->GetParent();
	298	if (ip < 0) {
	299	break;
	300	} else {
	301	iparent=ip;
	302	}
	303	}
	304	return iparent;
fe4da5cc	305	}
fe4da5cc	306