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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 | /* $Id$ */ | |
17 | ||
18 | //_________________________________________________________________________ | |
19 | // Class for the management by the Emc reconstruction. | |
20 | //// | |
21 | //*-- Author : Boris Polichtchouk (IHEP, Protvino) 6 Mar 2001 | |
22 | // | |
23 | // --- ROOT system --- | |
24 | ||
25 | #include <TMath.h> | |
26 | ||
27 | // --- Standard library --- | |
28 | ||
29 | // --- AliRoot header files --- | |
30 | ||
31 | #include "AliPHOSRecEmcManager.h" | |
32 | ||
33 | ClassImp(AliPHOSRecEmcManager) | |
34 | ||
35 | //____________________________________________________________________________ | |
36 | ||
37 | AliPHOSRecEmcManager::AliPHOSRecEmcManager(): | |
38 | fOneGamChisqCut(1.3f), | |
39 | fOneGamInitialStep(0.00005f), | |
40 | fOneGamChisqMin(1.f), | |
41 | fOneGamStepMin(0.0005f), | |
42 | fOneGamNumOfIterations(50), | |
43 | fTwoGamInitialStep(0.00005f), | |
44 | fTwoGamChisqMin(1.f), | |
45 | fTwoGamEmin(0.1f), | |
46 | fTwoGamStepMin(0.00005), | |
47 | fTwoGamNumOfIterations(50), | |
48 | fThr0(0.f), | |
49 | fSqdCut(0.f) | |
50 | { | |
51 | // default ctor | |
52 | SetTitle("Emc Reconstruction Manager"); | |
53 | } | |
54 | ||
55 | AliPHOSRecEmcManager::~AliPHOSRecEmcManager(void) {} | |
56 | ||
57 | Float_t AliPHOSRecEmcManager::Dispersion(Float_t ei) const | |
58 | { | |
59 | //"Dispresion" of energy deposition in the cell. | |
60 | // eTot is the total shower energy, ai is the | |
61 | // calculated cell response, | |
62 | // ei is the measured cell response. | |
63 | ||
64 | return ei; | |
65 | } | |
66 | ||
67 | Float_t AliPHOSRecEmcManager::OneGamChi2(Float_t ai, Float_t ei, Float_t, Float_t& gi) const | |
68 | { | |
69 | // Chi2 used in OneGam (one-gamma fitting). | |
70 | // gi is d(Chi2)/d(ai). | |
71 | ||
72 | Float_t da = ai - ei; | |
73 | Float_t d = ei; // we assume that sigma(E) = sqrt(E) | |
74 | gi = 2.*(ai-ei)/d; | |
75 | ||
76 | return da*da/d; | |
77 | ||
78 | } | |
79 | ||
80 | Float_t AliPHOSRecEmcManager::TwoGamChi2(Float_t ai, Float_t ei, Float_t, Float_t& gi) const | |
81 | { | |
82 | // calculates chi^2 | |
83 | Float_t da = ai - ei; | |
84 | Float_t d = ei; // we assume that sigma(E) = sqrt(E) | |
85 | gi = 2.*(ai-ei)/d; | |
86 | ||
87 | return da*da/d; | |
88 | ||
89 | } | |
90 | ||
91 | void AliPHOSRecEmcManager::AG(Float_t ei, Float_t xi, Float_t yi, Float_t& ai, Float_t& gxi, Float_t& gyi ) | |
92 | { | |
93 | //Calculates amplitude (ai) and gradients (gxi, gyi) of CPV pad response. | |
94 | //Integrated response (total "shower energy") is E, | |
95 | //xi and yi are the distances along x and y from reference point | |
96 | // to the pad center. | |
97 | //Shape of the shower is from PHOS TDR. | |
98 | ||
99 | ||
100 | Float_t r = TMath::Sqrt(xi*xi + yi*yi); | |
101 | Float_t r4 = r*r*r*r ; | |
102 | Float_t r295 = TMath::Power(r, 2.95) ; | |
103 | Float_t shape = ei*TMath::Exp( -r4 * (1. / (2.32 + 0.26 * r4) + 0.0316 / (1 + 0.0652 * r295) ) ) ; | |
104 | ai = shape; | |
105 | ||
106 | ||
107 | //d(shape)/d(xi) | |
108 | gxi = (-(TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2)* | |
109 | ((-0.006077944*xi*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2), | |
110 | 0.4750000000000001))/ | |
111 | TMath::Power(1 + 0.0652*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),1.475),2) - | |
112 | (1.04*xi*(TMath::Power(xi,2) + TMath::Power(yi,2)))/ | |
113 | TMath::Power(2.32 + 0.26*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2),2))) - | |
114 | 4*xi*(TMath::Power(xi,2) + TMath::Power(yi,2))* | |
115 | (0.0316/(1 + 0.0652*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),1.475)) + | |
116 | 1./(2.32 + 0.26*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2))))/ | |
117 | TMath::Power(TMath::E(),TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2)* | |
118 | (0.0316/(1 + 0.0652*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),1.475)) + | |
119 | 1./(2.32 + 0.26*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2)))); | |
120 | ||
121 | gxi = gxi*ei; | |
122 | ||
123 | //d(shape)/d(yi) | |
124 | gyi = (-(TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2)* | |
125 | ((-0.006077944*yi*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2), | |
126 | 0.4750000000000001))/ | |
127 | TMath::Power(1 + 0.0652*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),1.475),2) - | |
128 | (1.04*yi*(TMath::Power(xi,2) + TMath::Power(yi,2)))/ | |
129 | TMath::Power(2.32 + 0.26*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2),2))) - | |
130 | 4*yi*(TMath::Power(xi,2) + TMath::Power(yi,2))* | |
131 | (0.0316/(1 + 0.0652*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),1.475)) + | |
132 | 1./(2.32 + 0.26*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2))))/ | |
133 | TMath::Power(TMath::E(),TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2)* | |
134 | (0.0316/(1 + 0.0652*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),1.475)) + | |
135 | 1./(2.32 + 0.26*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2)))); | |
136 | ||
137 | ||
138 | gyi = gyi*ei; | |
139 | ||
140 | } | |
141 | ||
142 | ||
143 | ||
144 | ||
145 | ||
146 | ||
147 |