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1 | //--------------------------------------------------------------------------------- | |
2 | // The AliKFVertex class | |
3 | // . | |
4 | // @author S.Gorbunov, I.Kisel | |
5 | // @version 1.0 | |
6 | // @since 13.05.07 | |
7 | // | |
8 | // Class to reconstruct and store primary and secondary vertices. | |
9 | // The method is described in CBM-SOFT note 2007-003, | |
10 | // ``Reconstruction of decayed particles based on the Kalman filter'', | |
11 | // http://www.gsi.de/documents/DOC-2007-May-14-1.pdf | |
12 | // | |
13 | // This class is ALICE interface to general mathematics in AliKFParticleBase | |
14 | // | |
15 | // -= Copyright © ALICE HLT Group =- | |
16 | //_________________________________________________________________________________ | |
17 | ||
18 | #ifndef ALIKFVERTEX_H | |
19 | #define ALIKFVERTEX_H | |
20 | ||
21 | #include "AliKFParticle.h" | |
22 | #include "AliVVertex.h" | |
23 | ||
24 | class AliKFVertex : public AliKFParticle | |
25 | { | |
26 | ||
27 | public: | |
28 | ||
29 | //* | |
30 | //* INITIALIZATION | |
31 | //* | |
32 | ||
33 | //* Constructor (empty) | |
34 | ||
35 | AliKFVertex():AliKFParticle(),fIsConstrained(0){ } | |
36 | ||
37 | //* Destructor (empty) | |
38 | ||
39 | ~AliKFVertex(){} | |
40 | ||
41 | //* Initialisation from VVertex | |
42 | ||
43 | AliKFVertex( const AliVVertex &vertex ); | |
44 | ||
45 | ||
46 | //* | |
47 | //* ACCESSORS | |
48 | //* | |
49 | ||
50 | //* Number of tracks composing the vertex | |
51 | ||
52 | Int_t GetNContributors() const { return fIsConstrained ?fNDF/2:(fNDF+3)/2; } | |
53 | ||
54 | //* | |
55 | //* CONSTRUCTION OF THE VERTEX BY ITS DAUGHTERS | |
56 | //* USING THE KALMAN FILTER METHOD | |
57 | //* | |
58 | ||
59 | ||
60 | //* Simple way to construct vertices ex. D0 = Pion + Kaon; | |
61 | ||
62 | void operator +=( const AliKFParticle &Daughter ); | |
63 | ||
64 | //* Subtract particle from vertex | |
65 | ||
66 | AliKFVertex operator -( const AliKFParticle &Daughter ) const; | |
67 | ||
68 | void operator -=( const AliKFParticle &Daughter ); | |
69 | ||
70 | //* Set beam constraint to the primary vertex | |
71 | ||
72 | void SetBeamConstraint( Double_t X, Double_t Y, Double_t Z, | |
73 | Double_t ErrX, Double_t ErrY, Double_t ErrZ ); | |
74 | ||
75 | //* Set beam constraint off | |
76 | ||
77 | void SetBeamConstraintOff(); | |
78 | ||
79 | //* Construct vertex with selection of tracks (primary vertex) | |
80 | ||
81 | void ConstructPrimaryVertex( const AliKFParticle *vDaughters[], int NDaughters, | |
82 | Bool_t vtxFlag[], Double_t ChiCut=3.5 ); | |
83 | ||
84 | protected: | |
85 | ||
86 | Bool_t fIsConstrained; // Is the beam constraint set | |
87 | ||
88 | ClassDef( AliKFVertex, 1 ); | |
89 | ||
90 | }; | |
91 | ||
92 | ||
93 | //--------------------------------------------------------------------- | |
94 | // | |
95 | // Inline implementation of the AliKFVertex methods | |
96 | // | |
97 | //--------------------------------------------------------------------- | |
98 | ||
99 | ||
100 | inline void AliKFVertex::operator +=( const AliKFParticle &Daughter ) | |
101 | { | |
102 | AliKFParticle::operator +=( Daughter ); | |
103 | } | |
104 | ||
105 | ||
106 | inline void AliKFVertex::operator -=( const AliKFParticle &Daughter ) | |
107 | { | |
108 | Daughter.SubtractFromVertex( *this ); | |
109 | } | |
110 | ||
111 | inline AliKFVertex AliKFVertex::operator -( const AliKFParticle &Daughter ) const | |
112 | { | |
113 | AliKFVertex tmp = *this; | |
114 | Daughter.SubtractFromVertex( tmp ); | |
115 | return tmp; | |
116 | } | |
117 | ||
118 | ||
119 | #endif |