1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
18 //_________________________________________________________________________
19 // Class for the management by the CPV reconstruction.
21 //*-- Author : Boris Polichtchouk (IHEP, Protvino) 6 Mar 2001
23 // --- ROOT system ---
27 // --- Standard library ---
29 // --- AliRoot header files ---
31 #include "AliPHOSRecCpvManager.h"
32 #include "AliPHOSGeometry.h"
34 ClassImp(AliPHOSRecCpvManager)
36 //____________________________________________________________________________
37 AliPHOSRecCpvManager::AliPHOSRecCpvManager() :
39 fOneGamInitialStep(0.00005),
41 fOneGamStepMin(0.0005),
42 fOneGamNumOfIterations(50),
43 fTwoGamInitialStep(0.00005),
46 fTwoGamStepMin(0.00005),
47 fTwoGamNumOfIterations(50),
52 SetTitle("Cpv Reconstruction Manager");
55 AliPHOSRecCpvManager::~AliPHOSRecCpvManager(void)
60 Float_t AliPHOSRecCpvManager::Dispersion(Float_t etot, Float_t ai) const
62 //"Dispresion" of energy deposition in the cell.
63 // etot is the total shower energy, ai is the
64 // calculated cell response,
65 // ei is the measured cell response.
67 const Float_t kConst = 1.5;
68 return kConst*ai*(1.-ai/etot);
71 Float_t AliPHOSRecCpvManager::OneGamChi2(Float_t ai, Float_t ei, Float_t etot, Float_t& Gi) const
73 //"Chi2" for one cell.
74 // etot is the total "shower" energy, ai is the
75 // calculated cell response,
76 // ei is the measured cell response.
78 const Float_t kConst = 1.5;
81 Float_t d = kConst*ai*(1.-ai/etot);
84 Gi = dd*(2.- dd*kConst*(1.-2.*ai/etot));
86 Info("OneGamChi2", " OneGamChi2 (ai,ei,etot,&Gi,chi2) %f %f %f %f %f", ai, ei, etot, Gi, da*da/d );
92 Float_t AliPHOSRecCpvManager::TwoGamChi2(Float_t ai, Float_t ei, Float_t etot, Float_t& gi) const
96 const Float_t kConst = 1.5;
99 Float_t d = kConst*ai*(1.-ai/etot);
102 gi = dd*(2.- dd*kConst*(1.-2.*ai/etot));
108 void AliPHOSRecCpvManager::AG(Float_t ei, Float_t xi, Float_t yi, Float_t& ai, Float_t& gxi, Float_t& gyi )
110 //Calculates amplitude (ai) and gradients (gxi, gyi) of CPV pad response.
111 //Integrated response (total "shower energy") is e,
112 //xi and yi are the distances along x and y from reference point
113 // to the pad center.
115 AliPHOSGeometry * geom = AliPHOSGeometry::GetInstance() ;
117 Float_t celZ = geom->GetPadSizeZ();
118 Float_t celY = geom->GetPadSizePhi();
120 // // Info("AG", "celZ: %f celY: %f", celZ, celY) ;
122 Float_t dx = celZ/2.;
123 Float_t dy = celY/2.;
125 // // Float_t x = xi*celZ;
126 // // Float_t y = yi*celZ;
133 Float_t a = Fcml(x+dx,y+dy) - Fcml(x+dx,y-dy) - Fcml(x-dx,y+dy) + Fcml(x-dx,y-dy);
137 Float_t gx = GradX(x+dx,y+dy) - GradX(x+dx,y-dy) - GradX(x-dx,y+dy) + GradX(x-dx,y-dy);
140 Float_t gy = GradY(x+dx,y+dy) - GradY(x+dx,y-dy) - GradY(x-dx,y+dy) + GradY(x-dx,y-dy);
145 Float_t AliPHOSRecCpvManager::Fcml(Float_t x, Float_t y)
147 //Cumulative function
149 const Float_t ka = 1.0;
150 const Float_t kb = 0.70;
152 Float_t fff = TMath::ATan(x*y/( kb*TMath::Sqrt( (kb*kb) + x*x+y*y)))
153 - TMath::ATan(x*y/(3*kb*TMath::Sqrt((3*kb)*(3*kb) + x*x+y*y)))
154 + TMath::ATan(x*y/(5*kb*TMath::Sqrt((5*kb)*(5*kb) + x*x+y*y)))
155 - TMath::ATan(x*y/(7*kb*TMath::Sqrt((7*kb)*(7*kb) + x*x+y*y)))
156 + TMath::ATan(x*y/(9*kb*TMath::Sqrt((9*kb)*(9*kb) + x*x+y*y)));
158 Float_t fcml = ka*fff/TMath::TwoPi();
159 // Info("Fcml", "fcml: %f", fcml) ;
165 Float_t AliPHOSRecCpvManager::GradX(Float_t x, Float_t y)
167 // Put a comment here
169 const Float_t ka = 1.0;
170 const Float_t kb = 0.70;
172 Float_t skv = kb*kb + x*x + y*y;
174 Float_t sqskv=TMath::Sqrt(skv);
175 Float_t yxskv=y*(1.-x/sqskv)*(1.+x/sqskv);
178 yxskv* kb*sqskv/( kb*kb*skv+x*x*y*y)
179 - yxskv*3*kb*sqskv/((3*kb)*(3*kb)*skv+x*x*y*y)
180 + yxskv*5*kb*sqskv/((5*kb)*(5*kb)*skv+x*x*y*y)
181 - yxskv*7*kb*sqskv/((7*kb)*(7*kb)*skv+x*x*y*y)
182 + yxskv*9*kb*sqskv/((9*kb)*(9*kb)*skv+x*x*y*y);
184 Float_t grad = ka*gradient/TMath::TwoPi();
189 Float_t AliPHOSRecCpvManager::GradY(Float_t x, Float_t y)
191 // Put a comment here
193 const Float_t ka = 1.0;
194 const Float_t kb = 0.70;
196 Float_t skv = kb*kb + x*x + y*y;
198 Float_t sqskv=TMath::Sqrt(skv);
199 Float_t xyskv=x*(1.-y/sqskv)*(1.+y/sqskv);
202 xyskv* kb*sqskv/( kb*kb*skv+x*x*y*y)
203 - xyskv*3*kb*sqskv/((3*kb)*(3*kb)*skv+x*x*y*y)
204 + xyskv*5*kb*sqskv/((5*kb)*(5*kb)*skv+x*x*y*y)
205 - xyskv*7*kb*sqskv/((7*kb)*(7*kb)*skv+x*x*y*y)
206 + xyskv*9*kb*sqskv/((9*kb)*(9*kb)*skv+x*x*y*y);
208 Float_t grad = ka*gradient/TMath::TwoPi();