2 /* Copyright (C) 2007 Christian Holm Christensen <cholm@nbi.dk>
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public License
6 * as published by the Free Software Foundation; either version 2.1 of
7 * the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20 @brief Declaration of a Bin in a Flow "histogram" */
21 //____________________________________________________________________
23 // This contains an of class AliFMDFlowHarmonic and an object of
24 // class AliFMDFlowEventPlane to calculate v_n and \Psi_k. It contain
25 // two objects of class AliFMDFlowEventPlane to calculate the
26 // sub-event event planes Psi_A, \Psi_B. It also contain 3 objects of
27 // class AliFMDFlowResolution to calculate the event plane angle
30 #ifndef ALIFMDFLOWBIN_H
31 #define ALIFMDFLOWBIN_H
32 #include <flow/AliFMDFlowEventPlane.h>
33 #include <flow/AliFMDFlowHarmonic.h>
34 #include <flow/AliFMDFlowResolution.h>
40 /** @defgroup c_binned Binned flow
41 @brief This group contains code for binned flow analysis. Two
42 kinds of "histograms" are defined - a 1 dimensional and a 2
43 dimensional set of binned objects of class AliFMDFlowBin.
45 Objects of class AliFMDFlowBin contains all the code needed to compute
48 The class AliFMDFlowAxis encodes look-up of a object of class
49 AliFMDFlowBin in a flow "Histogram"
51 //______________________________________________________
52 /** @class AliFMDFlowBin flow/AliFMDFlowBin.h <flow/AliFMDFlowBin.h>
55 This contains an of class AliFMDFlowHarmonic and an object of
56 class AliFMDFlowEventPlane to calculate @f$ v_n@f$ and
57 @f$\Psi_k@f$. It contain two objects of class
58 AliFMDFlowEventPlane to calculate the sub-event event planes
59 @f$\Psi_A, \Psi_B@f$. It also contain 3 objects of class
60 AliFMDFlowResolution to calculate the event plane angle
65 class AliFMDFlowBin : public TObject
68 /** Correction type */
72 /** Naive, using the formulas in Voloshins paper */
76 /** The way used in the TDR */
80 @param order Order of harmonic.
81 @param k Factor of event plane order=k * m */
82 AliFMDFlowBin(UShort_t order=0, UShort_t k=1)
92 @param o Object top copy from */
93 AliFMDFlowBin(const AliFMDFlowBin& o);
94 /** Assignment operator
95 @param o Object to assign from
96 @return Reference to this object */
97 AliFMDFlowBin& operator=(const AliFMDFlowBin& o);
100 virtual ~AliFMDFlowBin() {}
101 /** Should be called at the start of an event */
102 virtual void Begin();
103 /** Called to add a contribution to the event plane
104 @param phi The angle @f$ \varphi \in[0,2\pi]@f$
106 @param a If true, add to sub-event A, otherwise to sub-event
108 virtual void AddToEventPlane(Double_t phi, Double_t w=1, Bool_t a=kTRUE);
109 /** Called to add a contribution to the harmonic.
110 @param phi The angle @f$ \varphi \in[0,2\pi]@f$
111 @param w Weight of @a phi (only used in the calculation of
113 virtual void AddToHarmonic(Double_t phi, Double_t w=1);
114 /** Should be called at the end of an event */
117 @param phis @f$ (\varphi_i, \ldots, \varphi_n)@f$
118 @param ws Weights (optional)
119 @param n Size of @a phis and possibly @a ws */
120 virtual void Event(Double_t* phis, Double_t* ws, UInt_t n);
122 virtual void Finish();
123 /** Get the value in this bin
124 @param t Which type of correction
125 @return the value of the harmonic */
126 virtual Double_t Value(CorType t=kTdr) const;
127 /** Get the value in this bin
128 @param t Which type of correction
129 @return the error on the value of the harmonic */
130 virtual Double_t EValue(CorType t=kTdr) const;
131 /** Get the value in this bin
132 @param e2 On return, the square error.
133 @param t Which type of correction
134 @return the value of the harmonic */
135 virtual Double_t Value(Double_t& e2, CorType t=kTdr) const;
136 /** Get the value in this bin
137 @param e2 On return, the square error.
138 @param t Which type of correction
139 @return the value of the event plane correction */
140 virtual Double_t Correction(Double_t& e2, CorType t=kTdr) const;
141 /** Print summary to standard output */
142 virtual void Print(Option_t* option="") const; //*MENU*
144 virtual Bool_t IsFolder() const { return kTRUE; }
145 /** Browse this item */
146 virtual void Browse(TBrowser* b);
147 /** Get the event plane angle */
148 virtual Double_t Psi() const { return fPsi.Psi(); }
149 /** Get the sub-event A plane angle */
150 virtual Double_t PsiA() const { return fPsiA.Psi(); }
151 /** Get the sub-event B plane angle */
152 virtual Double_t PsiB() const { return fPsiB.Psi(); }
155 /** Major event plane */
156 AliFMDFlowEventPlane fPsi; // Major event plane
157 /** Sub-event A event plane */
158 AliFMDFlowEventPlane fPsiA; // Sub-event A event plane
159 /** Sub-event B event plane */
160 AliFMDFlowEventPlane fPsiB; // Sub-event B event plane
162 AliFMDFlowResolution fRes; // Resolution
164 AliFMDFlowResolutionStar fResStar; // Resolution
166 AliFMDFlowResolutionTDR fResTdr; // Resolution
168 AliFMDFlowHarmonic fHarmonic; // Harmonic
169 /** Define for ROOT I/O */
170 ClassDef(AliFMDFlowBin,1); // A flow analysis