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>
42 /** @defgroup c_binned Binned flow
43 @brief This group contains code for binned flow analysis. Two
44 kinds of "histograms" are defined - a 1 dimensional and a 2
45 dimensional set of binned objects of class AliFMDFlowBin.
47 Objects of class AliFMDFlowBin contains all the code needed to compute
50 The class AliFMDFlowAxis encodes look-up of a object of class
51 AliFMDFlowBin in a flow "Histogram"
53 //______________________________________________________
54 /** @class AliFMDFlowBin flow/AliFMDFlowBin.h <flow/AliFMDFlowBin.h>
57 This contains an of class AliFMDFlowHarmonic and an object of
58 class AliFMDFlowEventPlane to calculate @f$ v_n@f$ and
59 @f$\Psi_k@f$. It contain two objects of class
60 AliFMDFlowEventPlane to calculate the sub-event event planes
61 @f$\Psi_A, \Psi_B@f$. It also contain 3 objects of class
62 AliFMDFlowResolution to calculate the event plane angle
67 class AliFMDFlowBin : public TObject
70 /** Correction type */
74 /** Naive, using the formulas in Voloshins paper */
78 /** The way used in the TDR */
81 /** Types of things to draw */
90 /** Default Ctor - do not use */
107 @param order Order of harmonic.
108 @param k Factor of event plane order=k * m */
109 AliFMDFlowBin(UShort_t order, UShort_t k=1);
111 @param o Object top copy from */
112 AliFMDFlowBin(const AliFMDFlowBin& o);
113 /** Assignment operator
114 @param o Object to assign from
115 @return Reference to this object */
116 AliFMDFlowBin& operator=(const AliFMDFlowBin& o);
119 virtual ~AliFMDFlowBin() {}
123 /** Should be called at the start of an event */
124 virtual void Begin();
125 /** Called to add a contribution to the event plane
126 @param phi The angle @f$ \varphi \in[0,2\pi]@f$
128 @param a If true, add to sub-event A, otherwise to sub-event
130 virtual void AddToEventPlane(Double_t phi, Double_t w=1, Bool_t a=kTRUE);
131 /** Called to add a contribution to the harmonic.
132 @param phi The angle @f$ \varphi \in[0,2\pi]@f$
133 @param wp Weight of @a phi (only used in the calculation of
135 @param wh Weight if the @f$ \varphi@f$ observation */
136 virtual void AddToHarmonic(Double_t phi, Double_t wp=1, Double_t wh=1);
137 /** Should be called at the end of an event */
140 @param n Size of @a phis and possibly @a ws
141 @param phis @f$ (\varphi_i, \ldots, \varphi_n)@f$
142 @param wp Weights for event plane (optional)
143 @param wh Weights for harmonic (optional - can be the same as @a ws) */
144 virtual void Event(UInt_t n, Double_t* phis, Double_t* wp=0, Double_t* wh=0);
146 virtual void Finish();
151 /** Get the harmonic order
152 @return The harmonic order */
153 virtual UShort_t Order() const { return fHarmonic.Order(); }
154 /** Get the harmonic order
155 @return The harmonic order */
156 virtual UShort_t PsiOrder() const { return fPsi.Order(); }
161 /** Get the value in this bin
162 @param t Which type of correction
163 @return the value of the harmonic */
164 virtual Double_t Value(CorType t=kTdr) const;
165 /** Get the value in this bin
166 @param t Which type of correction
167 @return the error on the value of the harmonic */
168 virtual Double_t EValue(CorType t=kTdr) const;
169 /** Get the value in this bin
170 @param e2 On return, the square error.
171 @param t Which type of correction
172 @return the value of the harmonic */
173 virtual Double_t Value(Double_t& e2, CorType t=kTdr) const;
174 /** Get the value in this bin
175 @param e2 On return, the square error.
176 @param t Which type of correction
177 @return the value of the event plane correction */
178 virtual Double_t Correction(Double_t& e2, CorType t=kTdr) const;
179 /** Get the number of counts used in this.
180 @return The number of counts used in this bin */
181 virtual ULong_t Counts() const;
186 /** Print summary to standard output */
187 virtual void Print(Option_t* option="") const; //*MENU*
189 virtual Bool_t IsFolder() const { return kTRUE; }
190 /** Browse this item */
191 virtual void Browse(TBrowser* b);
192 /** Get the event plane angle */
193 virtual Double_t Psi() const { return fPsi.Psi(); }
194 /** Get the sub-event A plane angle */
195 virtual Double_t PsiA() const { return fPsiA.Psi(); }
196 /** Get the sub-event B plane angle */
197 virtual Double_t PsiB() const { return fPsiB.Psi(); }
202 /** @return Split histogram */
203 const TH2& SplitHistogram() const { return fSplit; }
204 /** @return Phi histogram */
205 const TH1& PhiHistogram() const { return fPhi; }
208 /** Major event plane */
209 AliFMDFlowEventPlane fPsi; // Major event plane
210 /** Sub-event A event plane */
211 AliFMDFlowEventPlane fPsiA; // Sub-event A event plane
212 /** Sub-event B event plane */
213 AliFMDFlowEventPlane fPsiB; // Sub-event B event plane
215 AliFMDFlowResolution fRes; // Resolution
217 AliFMDFlowResolutionStar fResStar; // Resolution
219 AliFMDFlowResolutionTDR fResTdr; // Resolution
221 AliFMDFlowHarmonic fHarmonic; // Harmonic
222 /** Histogram of the relative split between A and B */
224 /** Histogram of relative phi's */
226 /** Counter of number of observations in sub-A */
228 /** Counter of number of observations in sub-B */
230 /** Counter of number of observations */
232 /** Psi from A vs from B */
235 /** Define for ROOT I/O */
236 ClassDef(AliFMDFlowBin,1); // A flow analysis