4 #include "AliExternalTrackParam.h"
5 #include "AliITSUAux.h"
8 using namespace AliITSUAux;
11 class AliITSUSeed: public AliExternalTrackParam
14 enum {kKilled=BIT(14),kFake=BIT(15)};
15 enum {kF02,kF04,kF12,kF13,kF14,kF24, kF44,kNFElem}; // non-trivial elems of propagation matrix
16 enum {kK00,kK01,kK10,kK11,kK20,kK21,kK30,kK31,kK40,kK41, kNKElem}; // non-trivial elems of gain matrix
17 enum {kS00,kS10,kS11,kS20,kS21,kS22,kS30,kS31,kS32,kS33,kS40,kS41,kS42,kS43,kS44,kNSElem}; // elements of 5x5 sym matrix
18 enum {kR00,kR22,kNRElem}; // non trivial elements of rotation matrix
21 AliITSUSeed(const AliITSUSeed& src);
22 AliITSUSeed &operator=(const AliITSUSeed &src);
23 virtual ~AliITSUSeed();
24 virtual void Print(Option_t* option = "") const;
26 void SetLrClusterID(Int_t lr, Int_t cl);
27 void SetLr(Int_t lr) {SetLrClusterID(lr,-1);} // lr w/o cluster
28 void SetLrClusterID(UInt_t id) {fClID = id;}
29 void SetParent(TObject* par) {fParent = par;}
30 void SetChi2Cl(Double_t v) {fChi2Cl= v; v>0 ? fChi2Glo+=v : fChi2Penalty -= v;}
31 void Kill(Bool_t v=kTRUE) {SetBit(kKilled, v);}
32 void SetFake(Bool_t v=kTRUE) {SetBit(kFake, v);}
34 UInt_t GetLrClusterID() const {return fClID;}
35 Int_t GetLrCluster(Int_t &lr) const {return UnpackCluster(fClID,lr);}
36 Int_t GetLayerID() const {return UnpackLayer(fClID);}
37 Int_t GetClusterID() const {return UnpackCluster(fClID);}
38 Bool_t HasClusterOnLayer(Int_t lr) const {return fHitsPattern&(0x1<<lr);}
39 Int_t GetNLayersHit() const {return NumberOfBitsSet(fHitsPattern);}
40 UShort_t GetHitsPattern() const {return fHitsPattern;}
41 Float_t GetChi2Cl() const {return fChi2Cl;}
42 Float_t GetChi2Glo() const {return fChi2Glo;}
43 Float_t GetChi2Penalty() const {return fChi2Penalty;}
44 Float_t GetChi2GloNrm() const;
45 Bool_t IsKilled() const {return TestBit(kKilled);}
46 Bool_t IsFake() const {return TestBit(kFake);}
48 Int_t GetPoolID() const {return int(GetUniqueID())-1;}
49 void SetPoolID(Int_t id) {SetUniqueID(id+1);}
51 TObject* GetParent() const {return fParent;}
52 const AliITSUSeed* GetParent(Int_t lr) const;
54 virtual Bool_t IsSortable() const {return kTRUE;}
55 virtual Bool_t IsEqual(const TObject* obj) const;
56 virtual Int_t Compare(const TObject* obj) const;
59 void InitFromESDTrack(const AliESDtrack* esdTr);
61 void ApplyELoss2FMatrix(Double_t frac, Bool_t beforeProp);
62 Bool_t ApplyMaterialCorrection(Double_t xOverX0, Double_t xTimesRho, Double_t mass, Bool_t beforeProp);
63 Bool_t PropagateToX(Double_t xk, Double_t b);
64 Bool_t RotateToAlpha(Double_t alpha);
65 Bool_t GetTrackingXAtXAlpha(double xOther,double alpOther,double bz, double &x);
66 Double_t GetPredictedChi2(Double_t p[2],Double_t cov[3]);
68 Bool_t Smooth(Double_t vecL[5],Double_t matL[15]);
69 Double_t* ProdABA(const double a[15],const double b[15]) const;
71 UInt_t GetNChildren() const {return fNChildren;}
72 Int_t IncChildren() {return ++fNChildren;}
73 Int_t DecChildren() {return --fNChildren;}
77 Double_t fFMatrix[kNFElem]; // matrix of propagation from prev layer (non-trivial elements)
78 Double_t fKMatrix[kNKElem]; // Gain matrix non-trivial elements (note: standard MBF formula uses I-K*H)
79 Double_t fRMatrix[kNRElem]; // rotation matrix non-trivial elements
80 Double_t fCovIYZ[3]; // inverted matrix of propagation + meas errors = [Hi * Pi|i-1 * Hi^T + Ri]^-1
81 Double_t fResid[2]; // residuals vector
82 UShort_t fHitsPattern; // bit pattern of hits
83 UShort_t fNChildren; // number of children (prolongations)
84 UInt_t fClID; // packed cluster info (see AliITSUAux::PackCluster)
85 Float_t fChi2Glo; // current chi2 global (sum of track-cluster chi2's on layers with hit)
86 Float_t fChi2Cl; // track-cluster chi2 (if >0) or penalty for missing cluster (if < 0)
87 Float_t fChi2Penalty; // total penalty (e.g. for missing clusters)
88 TObject* fParent; // parent track (in higher tree hierarchy)
90 ClassDef(AliITSUSeed,1)
93 //_________________________________________________________________________
94 inline void AliITSUSeed::SetLrClusterID(Int_t lr, Int_t cl)
96 // assign layer, cluster (if -1 - no hit on this layer)
97 fClID = PackCluster(lr,cl);
98 if (cl>=0) fHitsPattern |= 0x1<<lr;
101 //_________________________________________________________________________
102 inline void AliITSUSeed::ResetFMatrix()
104 // reset transport matrix
105 fFMatrix[kF02] = fFMatrix[kF04] = fFMatrix[kF12] = fFMatrix[kF13] = fFMatrix[kF14] = fFMatrix[kF24] = 0;
106 fFMatrix[kF44] = 1.0; // this element accumulates eloss
109 //_________________________________________________________________________
110 inline Bool_t AliITSUSeed::ApplyMaterialCorrection(Double_t xOverX0, Double_t xTimesRho, Double_t mass, Bool_t beforeProp)
112 // apply material correction and modify transport matrix
113 double pold = Get1P();
114 if (!CorrectForMeanMaterial(xOverX0,xTimesRho,mass)) return kFALSE;
115 ApplyELoss2FMatrix( Get1P()/pold, beforeProp);
120 //_________________________________________________________________________
121 inline void AliITSUSeed::ApplyELoss2FMatrix(Double_t frac, Bool_t beforeProp)
123 // Accounts for the energy loss in the transport matrix
124 // equivalent to multiplying Fmatix by E=diag{1,1,1,1,P4new/P4old}, where P4 is the 1/pt param.
125 // If beforeProp is true, then it is assumed that the eloss was applied before the transport,
126 // i.e. F' = F * E, otherwise, after transport, F' = E * F
127 fFMatrix[kF44] *= frac;
129 fFMatrix[kF04] *= frac;
130 fFMatrix[kF14] *= frac;
131 fFMatrix[kF24] *= frac;
135 //_________________________________________________________________________
136 inline const AliITSUSeed* AliITSUSeed::GetParent(Int_t lr) const
138 // get parent at given layer
139 const AliITSUSeed* par=this;
141 while( par && (lrt=par->GetLayerID())>=0 ) {
143 par = dynamic_cast<const AliITSUSeed*>(par->GetParent());