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f826d409 | 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 "AliESDVertex.h" | |
23 | ||
24 | ||
25 | class AliKFVertex :public AliKFParticle | |
26 | { | |
27 | ||
28 | public: | |
29 | ||
30 | //* | |
31 | //* INITIALIZATION | |
32 | //* | |
33 | ||
34 | //* Constructor (empty) | |
35 | ||
36 | AliKFVertex():AliKFParticle(){} | |
37 | ||
38 | //* Destructor (empty) | |
39 | ||
40 | ~AliKFVertex(){} | |
41 | ||
42 | //* Initialisation from ESD vertex | |
43 | ||
44 | AliKFVertex( const AliESDVertex &vertex ); | |
45 | ||
46 | //* Copy vertex part to ESD vertex | |
47 | ||
48 | void CopyToESDVertex( AliESDVertex &Vtx ) const ; | |
49 | ||
50 | ||
51 | //* | |
52 | //* CONSTRUCTION OF THE VERTEX BY ITS DAUGHTERS | |
53 | //* USING THE KALMAN FILTER METHOD | |
54 | //* | |
55 | ||
56 | ||
f826d409 | 57 | |
58 | //* Subtract particle from vertex | |
59 | ||
60 | AliKFVertex operator -( const AliKFParticle &Daughter ) const; | |
61 | ||
62 | void operator -=( const AliKFParticle &Daughter ); | |
63 | ||
64 | //* Construct vertex with selection of tracks (primary vertex) | |
65 | ||
66 | void ConstructPrimaryVertex( const AliKFParticle *vDaughters[], int NDaughters, | |
67 | Double_t ChiCut=3.5 ); | |
68 | ||
3e90f604 | 69 | private: |
70 | ||
71 | //* Simple way to construct vertices ex. D0 = Pion + Kaon - NOT IMPLEMENTED | |
72 | ||
73 | AliKFParticle operator +( const AliKFParticle &Daughter ) const; | |
74 | ||
75 | void operator +=( const AliKFParticle &Daughter ); | |
76 | ||
f826d409 | 77 | ClassDef( AliKFVertex, 1 ); |
78 | ||
79 | }; | |
80 | ||
81 | ||
82 | ||
83 | //--------------------------------------------------------------------- | |
84 | // | |
85 | // Inline implementation of the AliKFVertex methods | |
86 | // | |
87 | //--------------------------------------------------------------------- | |
88 | ||
89 | inline void AliKFVertex::CopyToESDVertex( AliESDVertex &v ) const | |
90 | { | |
91 | AliKFVertex vTmp=*this; | |
92 | v = AliESDVertex( vTmp.fP, vTmp.fC, vTmp.fChi2, (vTmp.fNDF +3)/2 ); | |
93 | } | |
94 | ||
95 | ||
96 | inline void AliKFVertex::operator -=( const AliKFParticle &Daughter ) | |
97 | { | |
98 | Daughter.SubtractFromVertex( *this ); | |
99 | } | |
100 | ||
101 | inline AliKFVertex AliKFVertex::operator -( const AliKFParticle &Daughter ) const | |
102 | { | |
103 | AliKFVertex tmp = *this; | |
104 | Daughter.SubtractFromVertex( tmp ); | |
105 | return tmp; | |
106 | } | |
107 | ||
108 | ||
109 | #endif |