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0bd4b00f | 1 | // |
2 | // This class contains the secondary correction and the double hit | |
3 | // correction used in low-flux events. | |
4 | // | |
5 | #ifndef ALIROOT_PWG2_FORWARD_ANALYSIS_ALIFMDCORRVERTEXBIAS_H | |
6 | #define ALIROOT_PWG2_FORWARD_ANALYSIS_ALIFMDCORRVERTEXBIAS_H | |
7 | #include <TObject.h> | |
8 | #include <TObjArray.h> | |
9 | #include <TAxis.h> | |
10 | class TH2D; | |
11 | ||
12 | /** | |
13 | * This class contains the correction for the bias introduced by | |
14 | * different vertex bins | |
15 | * | |
16 | * The correction is given by | |
17 | * @f[ | |
18 | * b_{v}(\eta,\varphi) = \frac{1/N_{t}\sum_i^{N_{tv}} N_{ch,i,primary}}{ | |
19 | * 1/N_{v}\sum_i^{N_{v}} N_{ch,i,primary}} | |
20 | * @f] | |
21 | * | |
22 | * where @f$N_{ch,i,primary}@f$ is the number of primary particles in | |
23 | * the given @f$(\eta,\varphi)@f$, and where the denominator sum runs | |
24 | * over all events with a vertex within the given vertex bin, and the | |
25 | * sum in the numerator runs over only events that have a valid | |
26 | * trigger and reconstructed vertex. @f$ N_{t}@f$ is the number of | |
27 | * events with a valid trigger (but not necessarily a valid vertex). | |
28 | * The vertex information used @f$v@f$ is in all cases the MC truth | |
29 | * vertex | |
30 | * | |
31 | * These are generated from Monte-Carlo truth and ESD information. | |
32 | * | |
33 | * @ingroup pwg2_forward_corr | |
34 | */ | |
35 | class AliFMDCorrVertexBias : public TObject | |
36 | { | |
37 | public: | |
38 | /** | |
39 | * Default constructor | |
40 | */ | |
41 | AliFMDCorrVertexBias(); | |
42 | /** | |
43 | * Copy constructor | |
44 | * | |
45 | * @param o Object to copy from | |
46 | */ | |
47 | AliFMDCorrVertexBias(const AliFMDCorrVertexBias& o); | |
48 | /** | |
49 | * Destructor | |
50 | * | |
51 | */ | |
52 | virtual ~AliFMDCorrVertexBias(); | |
53 | /** | |
54 | * @{ | |
55 | * @name Get corrections and parameters | |
56 | */ | |
57 | /** | |
58 | * Assignment operator | |
59 | * | |
60 | * @param o Object to assign from | |
61 | * | |
62 | * @return Reference to this object | |
63 | */ | |
64 | AliFMDCorrVertexBias& operator=(const AliFMDCorrVertexBias& o); | |
65 | /** | |
66 | * Get the vertex bias correction @f$ b_{v}@f$ | |
67 | * | |
68 | * @param r Ring type (I or O) | |
69 | * @param v Primary interaction point @f$z@f$ coordinate | |
70 | * | |
71 | * @return The correction @f$ b_{v}@f$ | |
72 | */ | |
73 | TH2D* GetCorrection(Char_t r, Double_t v) const; | |
74 | /** | |
75 | * Get the vertex bias correction @f$ b_{v}@f$ | |
76 | * | |
77 | * @param r Ring type (I or O) | |
78 | * @param b Bin corresponding to the primary interaction point | |
79 | * @f$z@f$ coordinate (1 based) | |
80 | * | |
81 | * @return The correction @f$ b_{v}@f$ | |
82 | */ | |
83 | TH2D* GetCorrection(Char_t r, UShort_t b) const; | |
84 | /** | |
85 | * Get the vertex axis used | |
86 | * | |
87 | * @return vertex axis | |
88 | */ | |
89 | const TAxis& GetVertexAxis() const { return fVertexAxis; } | |
90 | /* @} */ | |
91 | ||
92 | /** | |
93 | * @{ | |
94 | * @name Set corrections and parameters | |
95 | */ | |
96 | /** | |
97 | * Set the vertex bias correction @f$ b_{v}(\eta,\varphi)@f$. | |
98 | * Note, that the object takes ownership of the passed pointer. | |
99 | * | |
100 | * @param r Ring type (I or O) | |
101 | * @param v Primary interaction point @f$z@f$ coordinate | |
102 | * @param h @f$ b_{v}(\eta,\varphi)@f$ | |
103 | * | |
104 | * @return true if operation succeeded | |
105 | */ | |
106 | Bool_t SetCorrection(Char_t r, Double_t v, TH2D* h); | |
107 | /** | |
108 | * Set the vertex bias correction @f$ b_{v}(\eta,\varphi)@f$ | |
109 | * Note, that the object takes ownership of the passed pointer. | |
110 | * | |
111 | * @param r Ring type (I or O) | |
112 | * @param b Bin corresponding to the primary interaction point | |
113 | * @f$z@f$ coordinate (1 based) | |
114 | * @param h @f$ b_{v}(\eta,\varphi)@f$ | |
115 | * | |
116 | * @return true if operation succeeded | |
117 | */ | |
118 | Bool_t SetCorrection(Char_t r, UShort_t b, TH2D* h); | |
119 | /** | |
120 | * Set the vertex axis to use | |
121 | * | |
122 | * @param axis Vertex axis | |
123 | */ | |
124 | void SetVertexAxis(const TAxis& axis); | |
125 | /** | |
126 | * Set the vertex axis to use | |
127 | * | |
7c1a1f1d | 128 | * @param nBins Number of bins |
129 | * @param min Minimum | |
130 | * @param max Maximum | |
0bd4b00f | 131 | */ |
132 | void SetVertexAxis(Int_t nBins, Double_t min, Double_t max); | |
133 | /* @} */ | |
134 | ||
135 | /** | |
136 | * @{ | |
137 | * @name Auxiliary member functions | |
138 | */ | |
139 | /** | |
140 | * Declare this as a folder | |
141 | * | |
142 | * @return Always true | |
143 | */ | |
144 | Bool_t IsFolder() const { return true; } | |
145 | /** | |
146 | * Browse this object in the browser | |
147 | * | |
148 | * @param b | |
149 | */ | |
150 | void Browse(TBrowser* b); | |
151 | /** | |
152 | * Print this object | |
153 | * | |
154 | * @param option | |
155 | */ | |
156 | void Print(Option_t* option="R") const; //*MENU* | |
157 | /* @} */ | |
158 | protected: | |
159 | /** | |
160 | * Find the vertex bin that corresponds to the passed vertex | |
161 | * | |
162 | * @param vertex The interaction points @f$z@f$-coordinate | |
163 | * | |
7c1a1f1d | 164 | * @return Vertex bin in @f$[1,N_{\mbox{vertex}}]@f$ or negative if |
0bd4b00f | 165 | * out of range |
166 | */ | |
167 | Int_t FindVertexBin(Double_t vertex) const; | |
168 | /** | |
169 | * Get the vertex array corresponding to the specified ring | |
170 | * | |
171 | * @param v vertex bin (1 based) | |
172 | * | |
173 | * @return Pointer to vertex array, or null in case of problems | |
174 | */ | |
175 | TObjArray* GetVertexArray(UShort_t v) const; | |
176 | /** | |
177 | * Get the vertex array corresponding to the specified ring | |
178 | * | |
179 | * @param v vertex bin (1 based) | |
180 | * | |
181 | * @return Pointer to vertex array, or newly created container | |
182 | */ | |
183 | TObjArray* GetOrMakeVertexArray(UShort_t v); | |
184 | ||
185 | TObjArray fVertexArray; // Array of per-ring, per-vertex 2nd map | |
186 | TAxis fVertexAxis; // The vertex axis | |
187 | ClassDef(AliFMDCorrVertexBias,1); // | |
188 | }; | |
189 | ||
190 | //____________________________________________________________________ | |
191 | inline void | |
192 | AliFMDCorrVertexBias::SetVertexAxis(Int_t nBins, Double_t min, Double_t max) | |
193 | { | |
194 | fVertexAxis.Set(nBins, min, max); | |
195 | } | |
196 | //____________________________________________________________________ | |
197 | inline void | |
198 | AliFMDCorrVertexBias::SetVertexAxis(const TAxis& e) | |
199 | { | |
200 | fVertexAxis.Set(e.GetNbins(), e.GetXmin(), e.GetXmax()); | |
201 | } | |
202 | #endif | |
203 | // Local Variables: | |
204 | // mode: C++ | |
205 | // End: |