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1 | /************************************************************************** | |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | ||
17 | //_________________________________________________________________________ | |
18 | // Class for the management by the CPV reconstruction. | |
19 | //// | |
20 | //*-- Author : Boris Polichtchouk (IHEP, Protvino) 6 Mar 2001 | |
21 | // | |
22 | // --- ROOT system --- | |
23 | ||
24 | // --- Standard library --- | |
25 | ||
26 | // --- AliRoot header files --- | |
27 | ||
28 | #include "AliPHOSRecCpvManager.h" | |
29 | #include "AliPHOSGetter.h" | |
30 | ||
31 | ClassImp(AliPHOSRecCpvManager) | |
32 | ||
33 | //____________________________________________________________________________ | |
34 | ||
35 | AliPHOSRecCpvManager::AliPHOSRecCpvManager() | |
36 | { | |
37 | // Put a comment here | |
38 | ||
39 | fOneGamChisqCut = 3.; // If Chi2/dof > fOneGamChisqCut, split point. | |
40 | ||
41 | fOneGamInitialStep = 0.00005; | |
42 | fOneGamChisqMin = 1.; | |
43 | fOneGamStepMin = 0.0005; | |
44 | fOneGamNumOfIterations = 50; | |
45 | ||
46 | fTwoGamInitialStep = 0.00005; | |
47 | fTwoGamChisqMin = 1.; | |
48 | fTwoGamEmin = 0.1; | |
49 | fTwoGamStepMin = 0.00005; | |
50 | fTwoGamNumOfIterations = 50; | |
51 | ||
52 | // fThr0 = 0.0285; // Min. energy of rec. point. If E<fThr0, point deleted. | |
53 | // fSqdCut = 3.; // Min. distance (in cm) between two rec points. | |
54 | ||
55 | fThr0 = 0.; | |
56 | fSqdCut = 0.; | |
57 | ||
58 | SetTitle("Cpv Reconstruction Manager"); | |
59 | } | |
60 | ||
61 | AliPHOSRecCpvManager::~AliPHOSRecCpvManager(void) | |
62 | { | |
63 | // Put a comment here | |
64 | } | |
65 | ||
66 | Float_t AliPHOSRecCpvManager::Dispersion(Float_t etot, Float_t ai, Float_t ei) const | |
67 | { | |
68 | //"Dispresion" of energy deposition in the cell. | |
69 | // etot is the total shower energy, ai is the | |
70 | // calculated cell response, | |
71 | // ei is the measured cell response. | |
72 | ||
73 | const Float_t kConst = 1.5; | |
74 | return kConst*ai*(1.-ai/etot); | |
75 | } | |
76 | ||
77 | Float_t AliPHOSRecCpvManager::OneGamChi2(Float_t ai, Float_t ei, Float_t etot, Float_t& Gi) const | |
78 | { | |
79 | //"Chi2" for one cell. | |
80 | // etot is the total "shower" energy, ai is the | |
81 | // calculated cell response, | |
82 | // ei is the measured cell response. | |
83 | ||
84 | const Float_t kConst = 1.5; | |
85 | ||
86 | Float_t da = ai - ei; | |
87 | Float_t d = kConst*ai*(1.-ai/etot); | |
88 | ||
89 | Float_t dd = da/d; | |
90 | Gi = dd*(2.- dd*kConst*(1.-2.*ai/etot)); | |
91 | ||
92 | Info("OneGamChi2", " OneGamChi2 (ai,ei,etot,&Gi,chi2) %f %f %f %f %f", ai, ei, etot, Gi, da*da/d ); | |
93 | ||
94 | return da*da/d; | |
95 | ||
96 | } | |
97 | ||
98 | Float_t AliPHOSRecCpvManager::TwoGamChi2(Float_t ai, Float_t ei, Float_t etot, Float_t& gi) const | |
99 | { | |
100 | // Put a comment here | |
101 | ||
102 | const Float_t kConst = 1.5; | |
103 | ||
104 | Float_t da = ai - ei; | |
105 | Float_t d = kConst*ai*(1.-ai/etot); | |
106 | ||
107 | Float_t dd = da/d; | |
108 | gi = dd*(2.- dd*kConst*(1.-2.*ai/etot)); | |
109 | ||
110 | return da*da/d; | |
111 | ||
112 | } | |
113 | ||
114 | void AliPHOSRecCpvManager::AG(Float_t ei, Float_t xi, Float_t yi, Float_t& ai, Float_t& gxi, Float_t& gyi ) | |
115 | { | |
116 | //Calculates amplitude (ai) and gradients (gxi, gyi) of CPV pad response. | |
117 | //Integrated response (total "shower energy") is e, | |
118 | //xi and yi are the distances along x and y from reference point | |
119 | // to the pad center. | |
120 | ||
121 | AliPHOSGetter * gime = AliPHOSGetter::GetInstance() ; | |
122 | const AliPHOSGeometry* geom = gime->PHOSGeometry(); | |
123 | Float_t celZ = geom->GetPadSizeZ(); | |
124 | Float_t celY = geom->GetPadSizePhi(); | |
125 | ||
126 | // // Info("AG", "celZ: %f celY: %f", celZ, celY) ; | |
127 | ||
128 | Float_t dx = celZ/2.; | |
129 | Float_t dy = celY/2.; | |
130 | ||
131 | // // Float_t x = xi*celZ; | |
132 | // // Float_t y = yi*celZ; | |
133 | ||
134 | Float_t x = xi*celZ; | |
135 | Float_t y = yi*celY; | |
136 | ||
137 | Float_t e = ei; | |
138 | ||
139 | Float_t a = Fcml(x+dx,y+dy) - Fcml(x+dx,y-dy) - Fcml(x-dx,y+dy) + Fcml(x-dx,y-dy); | |
140 | ai = a*e; | |
141 | ||
142 | ||
143 | Float_t gx = GradX(x+dx,y+dy) - GradX(x+dx,y-dy) - GradX(x-dx,y+dy) + GradX(x-dx,y-dy); | |
144 | gxi = gx*e*e; | |
145 | ||
146 | Float_t gy = GradY(x+dx,y+dy) - GradY(x+dx,y-dy) - GradY(x-dx,y+dy) + GradY(x-dx,y-dy); | |
147 | gyi = gy*e*e; | |
148 | ||
149 | } | |
150 | ||
151 | Float_t AliPHOSRecCpvManager::Fcml(Float_t x, Float_t y) | |
152 | { | |
153 | //Cumulative function | |
154 | ||
155 | const Float_t ka = 1.0; | |
156 | const Float_t kb = 0.70; | |
157 | ||
158 | Float_t fff = TMath::ATan(x*y/( kb*TMath::Sqrt( (kb*kb) + x*x+y*y))) | |
159 | - TMath::ATan(x*y/(3*kb*TMath::Sqrt((3*kb)*(3*kb) + x*x+y*y))) | |
160 | + TMath::ATan(x*y/(5*kb*TMath::Sqrt((5*kb)*(5*kb) + x*x+y*y))) | |
161 | - TMath::ATan(x*y/(7*kb*TMath::Sqrt((7*kb)*(7*kb) + x*x+y*y))) | |
162 | + TMath::ATan(x*y/(9*kb*TMath::Sqrt((9*kb)*(9*kb) + x*x+y*y))); | |
163 | ||
164 | Float_t fcml = ka*fff/TMath::TwoPi(); | |
165 | // Info("Fcml", "fcml: %f", fcml) ; | |
166 | return fcml; | |
167 | ||
168 | } | |
169 | ||
170 | ||
171 | Float_t AliPHOSRecCpvManager::GradX(Float_t x, Float_t y) | |
172 | { | |
173 | // Put a comment here | |
174 | ||
175 | const Float_t ka = 1.0; | |
176 | const Float_t kb = 0.70; | |
177 | ||
178 | Float_t skv = kb*kb + x*x + y*y; | |
179 | ||
180 | Float_t gradient = y*(1.-x*x/skv)* kb*TMath::Sqrt(skv)/( kb*kb*skv+x*x*y*y) | |
181 | - y*(1.-x*x/skv)*3*kb*TMath::Sqrt(skv)/((3*kb)*(3*kb)*skv+x*x*y*y) | |
182 | + y*(1.-x*x/skv)*5*kb*TMath::Sqrt(skv)/((5*kb)*(5*kb)*skv+x*x*y*y) | |
183 | - y*(1.-x*x/skv)*7*kb*TMath::Sqrt(skv)/((7*kb)*(7*kb)*skv+x*x*y*y) | |
184 | + y*(1.-x*x/skv)*9*kb*TMath::Sqrt(skv)/((9*kb)*(9*kb)*skv+x*x*y*y); | |
185 | ||
186 | Float_t grad = ka*gradient/TMath::TwoPi(); | |
187 | return grad; | |
188 | } | |
189 | ||
190 | ||
191 | Float_t AliPHOSRecCpvManager::GradY(Float_t x, Float_t y) | |
192 | { | |
193 | // Put a comment here | |
194 | ||
195 | const Float_t ka = 1.0; | |
196 | const Float_t kb = 0.70; | |
197 | ||
198 | Float_t skv = kb*kb + x*x + y*y; | |
199 | Float_t gradient = x*(1.-y*y/skv)* kb*TMath::Sqrt(skv)/( kb*kb*skv+x*x*y*y) | |
200 | - x*(1.-y*y/skv)*3*kb*TMath::Sqrt(skv)/((3*kb)*(3*kb)*skv+x*x*y*y) | |
201 | + x*(1.-y*y/skv)*5*kb*TMath::Sqrt(skv)/((5*kb)*(5*kb)*skv+x*x*y*y) | |
202 | - x*(1.-y*y/skv)*7*kb*TMath::Sqrt(skv)/((7*kb)*(7*kb)*skv+x*x*y*y) | |
203 | + x*(1.-y*y/skv)*9*kb*TMath::Sqrt(skv)/((9*kb)*(9*kb)*skv+x*x*y*y); | |
204 | ||
205 | Float_t grad = ka*gradient/TMath::TwoPi(); | |
206 | return grad; | |
207 | } | |
208 | ||
209 |