bug fix
[u/mrichter/AliRoot.git] / FMD / AliFMDESDRevertexer.h
CommitLineData
50b9d194 1#ifndef ALIFMDESDREVERTEXER_H
2#define ALIFMDESDREVERTEXER_H
86878381 3#include <TObject.h>
4class 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 14class AliFMDESDRevertexer : public TObject
50b9d194 15{
16public:
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;
71protected:
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
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