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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 "AliPHOSGeometry.h" | |
30 | #include "AliPHOSLoader.h" | |
31 | ||
32 | ClassImp(AliPHOSRecCpvManager) | |
33 | ||
34 | //____________________________________________________________________________ | |
35 | ||
36 | AliPHOSRecCpvManager::AliPHOSRecCpvManager() | |
37 | { | |
38 | // Put a comment here | |
39 | ||
40 | fOneGamChisqCut = 3.; // If Chi2/dof > fOneGamChisqCut, split point. | |
41 | ||
42 | fOneGamInitialStep = 0.00005; | |
43 | fOneGamChisqMin = 1.; | |
44 | fOneGamStepMin = 0.0005; | |
45 | fOneGamNumOfIterations = 50; | |
46 | ||
47 | fTwoGamInitialStep = 0.00005; | |
48 | fTwoGamChisqMin = 1.; | |
49 | fTwoGamEmin = 0.1; | |
50 | fTwoGamStepMin = 0.00005; | |
51 | fTwoGamNumOfIterations = 50; | |
52 | ||
53 | // fThr0 = 0.0285; // Min. energy of rec. point. If E<fThr0, point deleted. | |
54 | // fSqdCut = 3.; // Min. distance (in cm) between two rec points. | |
55 | ||
56 | fThr0 = 0.; | |
57 | fSqdCut = 0.; | |
58 | ||
59 | SetTitle("Cpv Reconstruction Manager"); | |
60 | } | |
61 | ||
62 | AliPHOSRecCpvManager::~AliPHOSRecCpvManager(void) | |
63 | { | |
64 | // Put a comment here | |
65 | } | |
66 | ||
67 | Float_t AliPHOSRecCpvManager::Dispersion(Float_t etot, Float_t ai) const | |
68 | { | |
69 | //"Dispresion" of energy deposition in the cell. | |
70 | // etot is the total shower energy, ai is the | |
71 | // calculated cell response, | |
72 | // ei is the measured cell response. | |
73 | ||
74 | const Float_t kConst = 1.5; | |
75 | return kConst*ai*(1.-ai/etot); | |
76 | } | |
77 | ||
78 | Float_t AliPHOSRecCpvManager::OneGamChi2(Float_t ai, Float_t ei, Float_t etot, Float_t& Gi) const | |
79 | { | |
80 | //"Chi2" for one cell. | |
81 | // etot is the total "shower" energy, ai is the | |
82 | // calculated cell response, | |
83 | // ei is the measured cell response. | |
84 | ||
85 | const Float_t kConst = 1.5; | |
86 | ||
87 | Float_t da = ai - ei; | |
88 | Float_t d = kConst*ai*(1.-ai/etot); | |
89 | ||
90 | Float_t dd = da/d; | |
91 | Gi = dd*(2.- dd*kConst*(1.-2.*ai/etot)); | |
92 | ||
93 | Info("OneGamChi2", " OneGamChi2 (ai,ei,etot,&Gi,chi2) %f %f %f %f %f", ai, ei, etot, Gi, da*da/d ); | |
94 | ||
95 | return da*da/d; | |
96 | ||
97 | } | |
98 | ||
99 | Float_t AliPHOSRecCpvManager::TwoGamChi2(Float_t ai, Float_t ei, Float_t etot, Float_t& gi) const | |
100 | { | |
101 | // Put a comment here | |
102 | ||
103 | const Float_t kConst = 1.5; | |
104 | ||
105 | Float_t da = ai - ei; | |
106 | Float_t d = kConst*ai*(1.-ai/etot); | |
107 | ||
108 | Float_t dd = da/d; | |
109 | gi = dd*(2.- dd*kConst*(1.-2.*ai/etot)); | |
110 | ||
111 | return da*da/d; | |
112 | ||
113 | } | |
114 | ||
115 | void AliPHOSRecCpvManager::AG(Float_t ei, Float_t xi, Float_t yi, Float_t& ai, Float_t& gxi, Float_t& gyi ) | |
116 | { | |
117 | //Calculates amplitude (ai) and gradients (gxi, gyi) of CPV pad response. | |
118 | //Integrated response (total "shower energy") is e, | |
119 | //xi and yi are the distances along x and y from reference point | |
120 | // to the pad center. | |
121 | ||
122 | AliPHOSGeometry * geom = AliPHOSLoader::GetPHOSGeometry(); | |
123 | ||
124 | Float_t celZ = geom->GetPadSizeZ(); | |
125 | Float_t celY = geom->GetPadSizePhi(); | |
126 | ||
127 | // // Info("AG", "celZ: %f celY: %f", celZ, celY) ; | |
128 | ||
129 | Float_t dx = celZ/2.; | |
130 | Float_t dy = celY/2.; | |
131 | ||
132 | // // Float_t x = xi*celZ; | |
133 | // // Float_t y = yi*celZ; | |
134 | ||
135 | Float_t x = xi*celZ; | |
136 | Float_t y = yi*celY; | |
137 | ||
138 | Float_t e = ei; | |
139 | ||
140 | Float_t a = Fcml(x+dx,y+dy) - Fcml(x+dx,y-dy) - Fcml(x-dx,y+dy) + Fcml(x-dx,y-dy); | |
141 | ai = a*e; | |
142 | ||
143 | ||
144 | Float_t gx = GradX(x+dx,y+dy) - GradX(x+dx,y-dy) - GradX(x-dx,y+dy) + GradX(x-dx,y-dy); | |
145 | gxi = gx*e*e; | |
146 | ||
147 | Float_t gy = GradY(x+dx,y+dy) - GradY(x+dx,y-dy) - GradY(x-dx,y+dy) + GradY(x-dx,y-dy); | |
148 | gyi = gy*e*e; | |
149 | ||
150 | } | |
151 | ||
152 | Float_t AliPHOSRecCpvManager::Fcml(Float_t x, Float_t y) | |
153 | { | |
154 | //Cumulative function | |
155 | ||
156 | const Float_t ka = 1.0; | |
157 | const Float_t kb = 0.70; | |
158 | ||
159 | Float_t fff = TMath::ATan(x*y/( kb*TMath::Sqrt( (kb*kb) + x*x+y*y))) | |
160 | - TMath::ATan(x*y/(3*kb*TMath::Sqrt((3*kb)*(3*kb) + x*x+y*y))) | |
161 | + TMath::ATan(x*y/(5*kb*TMath::Sqrt((5*kb)*(5*kb) + x*x+y*y))) | |
162 | - TMath::ATan(x*y/(7*kb*TMath::Sqrt((7*kb)*(7*kb) + x*x+y*y))) | |
163 | + TMath::ATan(x*y/(9*kb*TMath::Sqrt((9*kb)*(9*kb) + x*x+y*y))); | |
164 | ||
165 | Float_t fcml = ka*fff/TMath::TwoPi(); | |
166 | // Info("Fcml", "fcml: %f", fcml) ; | |
167 | return fcml; | |
168 | ||
169 | } | |
170 | ||
171 | ||
172 | Float_t AliPHOSRecCpvManager::GradX(Float_t x, Float_t y) | |
173 | { | |
174 | // Put a comment here | |
175 | ||
176 | const Float_t ka = 1.0; | |
177 | const Float_t kb = 0.70; | |
178 | ||
179 | Float_t skv = kb*kb + x*x + y*y; | |
180 | ||
181 | Float_t gradient = y*(1.-x*x/skv)* kb*TMath::Sqrt(skv)/( kb*kb*skv+x*x*y*y) | |
182 | - y*(1.-x*x/skv)*3*kb*TMath::Sqrt(skv)/((3*kb)*(3*kb)*skv+x*x*y*y) | |
183 | + y*(1.-x*x/skv)*5*kb*TMath::Sqrt(skv)/((5*kb)*(5*kb)*skv+x*x*y*y) | |
184 | - y*(1.-x*x/skv)*7*kb*TMath::Sqrt(skv)/((7*kb)*(7*kb)*skv+x*x*y*y) | |
185 | + y*(1.-x*x/skv)*9*kb*TMath::Sqrt(skv)/((9*kb)*(9*kb)*skv+x*x*y*y); | |
186 | ||
187 | Float_t grad = ka*gradient/TMath::TwoPi(); | |
188 | return grad; | |
189 | } | |
190 | ||
191 | ||
192 | Float_t AliPHOSRecCpvManager::GradY(Float_t x, Float_t y) | |
193 | { | |
194 | // Put a comment here | |
195 | ||
196 | const Float_t ka = 1.0; | |
197 | const Float_t kb = 0.70; | |
198 | ||
199 | Float_t skv = kb*kb + x*x + y*y; | |
200 | Float_t gradient = x*(1.-y*y/skv)* kb*TMath::Sqrt(skv)/( kb*kb*skv+x*x*y*y) | |
201 | - x*(1.-y*y/skv)*3*kb*TMath::Sqrt(skv)/((3*kb)*(3*kb)*skv+x*x*y*y) | |
202 | + x*(1.-y*y/skv)*5*kb*TMath::Sqrt(skv)/((5*kb)*(5*kb)*skv+x*x*y*y) | |
203 | - x*(1.-y*y/skv)*7*kb*TMath::Sqrt(skv)/((7*kb)*(7*kb)*skv+x*x*y*y) | |
204 | + x*(1.-y*y/skv)*9*kb*TMath::Sqrt(skv)/((9*kb)*(9*kb)*skv+x*x*y*y); | |
205 | ||
206 | Float_t grad = ka*gradient/TMath::TwoPi(); | |
207 | return grad; | |
208 | } | |
209 | ||
210 |