Make separate, specialized geometries for RPhi and RhoZ views.
[u/mrichter/AliRoot.git] / PHOS / AliPHOSRecEmcManager.cxx
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cbd576a6 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
090026bf 16/* $Id$ */
cbd576a6 17
18//_________________________________________________________________________
19// Class for the management by the Emc reconstruction.
386aef34 20////
cbd576a6 21//*-- Author : Boris Polichtchouk (IHEP, Protvino) 6 Mar 2001
22//
23// --- ROOT system ---
24
090026bf 25#include <TMath.h>
26
cbd576a6 27// --- Standard library ---
28
cbd576a6 29// --- AliRoot header files ---
30
31#include "AliPHOSRecEmcManager.h"
cbd576a6 32
33ClassImp(AliPHOSRecEmcManager)
34
35//____________________________________________________________________________
36
3f7dbdb7 37AliPHOSRecEmcManager::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)
cbd576a6 50{
386aef34 51 // default ctor
cbd576a6 52 SetTitle("Emc Reconstruction Manager");
cbd576a6 53}
54
55AliPHOSRecEmcManager::~AliPHOSRecEmcManager(void) {}
56
90cceaf6 57Float_t AliPHOSRecEmcManager::Dispersion(Float_t ei) const
cbd576a6 58{
59 //"Dispresion" of energy deposition in the cell.
386aef34 60 // eTot is the total shower energy, ai is the
cbd576a6 61 // calculated cell response,
386aef34 62 // ei is the measured cell response.
cbd576a6 63
386aef34 64 return ei;
cbd576a6 65}
66
e957fea8 67Float_t AliPHOSRecEmcManager::OneGamChi2(Float_t ai, Float_t ei, Float_t fi, Float_t& gi) const
cbd576a6 68{
69 // Chi2 used in OneGam (one-gamma fitting).
386aef34 70 // gi is d(Chi2)/d(ai).
cbd576a6 71
e957fea8 72 fi = 0 ;
386aef34 73 Float_t da = ai - ei;
74 Float_t d = ei; // we assume that sigma(E) = sqrt(E)
75 gi = 2.*(ai-ei)/d;
cbd576a6 76
386aef34 77 return da*da/d;
cbd576a6 78
79}
80
e957fea8 81Float_t AliPHOSRecEmcManager::TwoGamChi2(Float_t ai, Float_t ei, Float_t fi, Float_t& gi) const
cbd576a6 82{
386aef34 83 // calculates chi^2
e957fea8 84 fi = 0 ;
386aef34 85 Float_t da = ai - ei;
86 Float_t d = ei; // we assume that sigma(E) = sqrt(E)
87 gi = 2.*(ai-ei)/d;
cbd576a6 88
386aef34 89 return da*da/d;
cbd576a6 90
91}
92
386aef34 93void AliPHOSRecEmcManager::AG(Float_t ei, Float_t xi, Float_t yi, Float_t& ai, Float_t& gxi, Float_t& gyi )
cbd576a6 94{
386aef34 95 //Calculates amplitude (ai) and gradients (gxi, gyi) of CPV pad response.
cbd576a6 96 //Integrated response (total "shower energy") is E,
386aef34 97 //xi and yi are the distances along x and y from reference point
cbd576a6 98 // to the pad center.
99 //Shape of the shower is from PHOS TDR.
100
101
386aef34 102 Float_t r = TMath::Sqrt(xi*xi + yi*yi);
cbd576a6 103 Float_t r4 = r*r*r*r ;
104 Float_t r295 = TMath::Power(r, 2.95) ;
386aef34 105 Float_t shape = ei*TMath::Exp( -r4 * (1. / (2.32 + 0.26 * r4) + 0.0316 / (1 + 0.0652 * r295) ) ) ;
106 ai = shape;
cbd576a6 107
108
386aef34 109 //d(shape)/d(xi)
110 gxi = (-(TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2)*
111 ((-0.006077944*xi*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),
cbd576a6 112 0.4750000000000001))/
386aef34 113 TMath::Power(1 + 0.0652*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),1.475),2) -
114 (1.04*xi*(TMath::Power(xi,2) + TMath::Power(yi,2)))/
115 TMath::Power(2.32 + 0.26*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2),2))) -
116 4*xi*(TMath::Power(xi,2) + TMath::Power(yi,2))*
117 (0.0316/(1 + 0.0652*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),1.475)) +
118 1./(2.32 + 0.26*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2))))/
119 TMath::Power(TMath::E(),TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2)*
120 (0.0316/(1 + 0.0652*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),1.475)) +
121 1./(2.32 + 0.26*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2))));
cbd576a6 122
386aef34 123 gxi = gxi*ei;
cbd576a6 124
386aef34 125 //d(shape)/d(yi)
126 gyi = (-(TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2)*
127 ((-0.006077944*yi*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),
cbd576a6 128 0.4750000000000001))/
386aef34 129 TMath::Power(1 + 0.0652*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),1.475),2) -
130 (1.04*yi*(TMath::Power(xi,2) + TMath::Power(yi,2)))/
131 TMath::Power(2.32 + 0.26*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2),2))) -
132 4*yi*(TMath::Power(xi,2) + TMath::Power(yi,2))*
133 (0.0316/(1 + 0.0652*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),1.475)) +
134 1./(2.32 + 0.26*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2))))/
135 TMath::Power(TMath::E(),TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2)*
136 (0.0316/(1 + 0.0652*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),1.475)) +
137 1./(2.32 + 0.26*TMath::Power(TMath::Power(xi,2) + TMath::Power(yi,2),2))));
138
139
140 gyi = gyi*ei;
cbd576a6 141
142}
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