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50b9d194 | 1 | #ifndef ALIFMDESDREVERTEXER_H |
2 | #define ALIFMDESDREVERTEXER_H | |
86878381 | 3 | #include <TObject.h> |
4 | class AliESDFMD; | |
50b9d194 | 5 | |
6 | // | |
7 | // Class to recaculate quantities in an AliESDFMD object based on new | |
8 | // a value for the z-coordinate of the primary interaction point. | |
9 | // | |
10 | // This allows us, in case we get a better determination of the | |
11 | // z-coordinate of the primary interaction, to recalibrate the signals | |
12 | // in the FMD ESD object, without having to redo the reconstruction. | |
13 | // | |
86878381 | 14 | class AliFMDESDRevertexer : public TObject |
50b9d194 | 15 | { |
16 | public: | |
17 | /** | |
18 | * Constructor | |
19 | * | |
20 | */ | |
21 | AliFMDESDRevertexer(); | |
22 | /** | |
23 | * Destructor | |
24 | * | |
25 | */ | |
26 | virtual ~AliFMDESDRevertexer() {} | |
27 | /** | |
28 | * Revertex the passed ESD. The passed ESD object will be modified | |
29 | * directly. | |
30 | * | |
31 | * @param fmdEsd ESD object to revertex. | |
32 | * @param vz New Z coordinate of primary vertex. | |
33 | * | |
34 | * @return @c true on success, @c false failure. | |
35 | */ | |
36 | Bool_t Revertex(AliESDFMD* fmdEsd, Double_t vz) const; | |
37 | ||
38 | /** | |
39 | * Calculate the physical coordinates (@a eta, @a phi) corresponding | |
40 | * to the detector coordinates (@a det, @a rng, @a sec, @a str). | |
41 | * | |
42 | * @param det The detector identifier | |
43 | * @param rng The ring identifier | |
44 | * @param sec The sector identifier | |
45 | * @param str The strip identifier | |
46 | * @param vz The z coordinate of the current primary interation vertex | |
47 | * @param eta On return, the psuedo-rapidity | |
48 | * @param phi On return, the azimuthal angle | |
49 | * @param r On return, the radius | |
50 | * @param theta On return, the polar angle | |
51 | */ | |
52 | Bool_t PhysicalCoordinates(UShort_t det, | |
53 | Char_t rng, | |
54 | UShort_t sec, | |
55 | UShort_t str, | |
56 | Double_t vz, | |
57 | Double_t& eta, | |
58 | Double_t& phi, | |
59 | Double_t& r, | |
60 | Double_t& theta) const; | |
61 | ||
62 | /** | |
63 | * Calculate the polar angle @f$ \theta@f$ corresponding to the | |
64 | * psuedo-rapidity @f$ \eta@f$ | |
65 | * | |
66 | * @param eta Psuedo rapidity @f$ \eta=-\log[\tan(\theta/2)]@f$ | |
67 | * | |
e5571b63 | 68 | * @return Polar angle @f$ \theta=2\tan^{-1}[\exp(-\eta)]@f$ |
50b9d194 | 69 | */ |
70 | Double_t Eta2Theta(Double_t eta) const; | |
71 | protected: | |
86878381 | 72 | ClassDef(AliFMDESDRevertexer,0) // Revertex and FMD ESD Object. |
50b9d194 | 73 | }; |
74 | ||
50b9d194 | 75 | #endif |
76 | // | |
77 | // Local Variables: | |
78 | // mode: C++ | |
79 | // End: | |
80 | // | |
81 | ||
82 | ||
83 |