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7607cc90 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// AliESDCaloCluster extension for PHOS to recalculate cluster
18// parameters in case of recalibration.
19//*--
20//*-- Author: Dmitri Peressounko (RRC KI)
21
22
23// --- ROOT system ---
24#include "TVector3.h"
25#include "TMath.h"
26
27// --- Standard library ---
28
29// --- AliRoot header files ---
30#include "AliLog.h"
31#include "AliPHOSGeometry.h"
32#include "AliPHOSPIDv1.h"
25312a8e 33#include "AliPHOSReconstructor.h"
7607cc90 34#include "AliPHOSEsdCluster.h"
35#include "AliPHOSCalibData.h"
36#include "AliESDCaloCells.h"
37
38ClassImp(AliPHOSEsdCluster)
39
40//____________________________________________________________________________
41AliPHOSEsdCluster::AliPHOSEsdCluster() :
42 AliESDCaloCluster(),fRecalibrated(0)
43{
44 // ctor
45}
46//____________________________________________________________________________
47AliPHOSEsdCluster::AliPHOSEsdCluster(const AliESDCaloCluster & clu) :
48 AliESDCaloCluster(clu),fRecalibrated(0)
49{
50 // cpy ctor
51}
52
53//____________________________________________________________________________
54AliPHOSEsdCluster::~AliPHOSEsdCluster()
55{
56 // dtor
57}
58//____________________________________________________________________________
59void AliPHOSEsdCluster::Recalibrate(AliPHOSCalibData * calibData,AliESDCaloCells *phsCells){
60 //If not done yet, apply recalibration coefficients to energies list
08a309ed 61 //NOTE that after recalibration fCellsAmpFraction contains not FRACTION but FULL energy
62
7607cc90 63 if(fRecalibrated)
64 return ;
65
66 if(!calibData)
67 return ;
68
69 AliPHOSGeometry * phosgeom = AliPHOSGeometry::GetInstance() ;
70 if(!phosgeom)
71 AliFatal("AliPHOSGeometry was not contructed\n") ;
72
73 for(Int_t i=0; i<fNCells; i++){
74 Int_t relId[4];
75 phosgeom->AbsToRelNumbering(fCellsAbsId[i],relId) ;
76 Int_t module = relId[0];
77 Int_t column = relId[3];
78 Int_t row = relId[2];
08a309ed 79 Double_t energy = phsCells->GetCellAmplitude(fCellsAbsId[i]) ;
25312a8e 80Double_t fr = fCellsAmpFraction[i] ;
08a309ed 81 fCellsAmpFraction[i]*=energy*calibData->GetADCchannelEmc(module,column,row);
25312a8e 82 printf(" mod=%d, col=%d, row=%d \n",module,column,row);
83 printf(" cell=%d, Amp=%f, E(i)=%f, Fr=%f, ci=%f \n",i,energy,fCellsAmpFraction[i],fr,calibData->GetADCchannelEmc(module,column,row)) ;
7607cc90 84 }
25312a8e 85printf("----\n") ;
7607cc90 86 fRecalibrated=kTRUE;
87}
88//____________________________________________________________________________
89void AliPHOSEsdCluster::EvalAll(Float_t logWeight, TVector3 &vtx){
90 //If recalibrated - recalculate all cluster parameters
91 if(!fRecalibrated)
92 return ;
93
94 EvalEnergy() ; //Energy should be evaluated first
95 EvalCoord(logWeight, vtx) ;
96
97}
98//____________________________________________________________________________
99void AliPHOSEsdCluster::EvalEnergy(){
100 if(!fRecalibrated) // no need to recalibrate
101 return ;
102
103 fEnergy=0. ;
104 for(Int_t iDigit=0; iDigit<fNCells; iDigit++) {
105 fEnergy+=fCellsAmpFraction[iDigit] ;
106 }
107 //Correct for nonlinearity later
25312a8e 108 if(fEnergy==0.){
109 printf("fEnergy=0 \n") ;
110 printf("n Digits = %d \n",fNCells) ;
111 for(Int_t iDigit=0; iDigit<fNCells; iDigit++) {
112 printf("E(%d)=%f \n",iDigit,fCellsAmpFraction[iDigit]);
113 }
114 }
7607cc90 115
116}
117//____________________________________________________________________________
25312a8e 118void AliPHOSEsdCluster::EnergyCorrection(){
119 //apply nonlinearity correction
120 fEnergy = AliPHOSReconstructor::CorrectNonlinearity(fEnergy) ;
7607cc90 121}
122//____________________________________________________________________________
123void AliPHOSEsdCluster::EvalPID(AliPHOSPIDv1 * /*pid*/){
124 //re-evaluate identification parameters
125// pid->CalculatePID(fEnergy,fDispersion,fEmcCpvDistance,tof,fPID) ;
126// pid->CalculatePID(fEnergy,fDispersion,fM20,fM02,fEmcCpvDistance,tof,fPID) ;
127}
128//____________________________________________________________________________
129void AliPHOSEsdCluster::EvalCoord(Float_t logWeight, TVector3 &vtx)
130{
131 // Calculates new center of gravity in the local PHOS-module coordinates
132 // and tranfers into global ALICE coordinates
133 // Calculates Dispersion and main axis
134 if(!fRecalibrated) // no need to recalibrate
135 return ;
136
137 Float_t wtot = 0. ;
138 Int_t relid[4] ;
139 Int_t phosMod=0 ;
140 Float_t xMean = 0. ;
141 Float_t zMean = 0. ;
142
143 AliPHOSGeometry * phosgeom = AliPHOSGeometry::GetInstance() ;
144 if(!phosgeom)
145 AliFatal("AliPHOSGeometry was not contructed\n") ;
146
147 for(Int_t iDigit=0; iDigit<fNCells; iDigit++) {
148 Float_t xi ;
149 Float_t zi ;
150 phosgeom->AbsToRelNumbering(fCellsAbsId[iDigit], relid) ;
151 phosgeom->RelPosInModule(relid, xi, zi);
152 phosMod=relid[0] ;
153 Double_t ei=fCellsAmpFraction[iDigit] ;
154 if (fEnergy>0 && ei>0) {
155 Float_t w = TMath::Max( 0., logWeight + TMath::Log(ei/fEnergy) ) ;
156 xMean+= xi * w ;
157 zMean+= zi * w ;
158 wtot += w ;
159 }
160 else
161 AliError(Form("Wrong energy %f and/or amplitude %f\n", ei, fEnergy));
162 }
163 if (wtot>0) {
164 xMean /= wtot ;
165 zMean /= wtot ;
166 }
167 else
168 AliError(Form("Wrong weight %f\n", wtot));
169
170
171// Calculates the dispersion and second momenta
172 Double_t d=0. ;
173 Double_t dxx = 0.;
174 Double_t dzz = 0.;
175 Double_t dxz = 0.;
176 for(Int_t iDigit=0; iDigit < fNCells; iDigit++) {
7607cc90 177 Float_t xi ;
178 Float_t zi ;
179 phosgeom->AbsToRelNumbering(fCellsAbsId[iDigit], relid) ;
180 phosgeom->RelPosInModule(relid, xi, zi);
181 Double_t ei=fCellsAmpFraction[iDigit] ;
182 if (fEnergy>0 && ei>0) {
183 Float_t w = TMath::Max( 0., logWeight + TMath::Log(ei/fEnergy) ) ;
184 d += w*((xi-xMean)*(xi-xMean) + (zi-zMean)*(zi-zMean) ) ;
185 dxx += w * xi * xi ;
186 dzz += w * zi * zi ;
187 dxz += w * xi * zi ;
188 }
189 else
190 AliError(Form("Wrong energy %f and/or amplitude %f\n", ei, fEnergy));
191 }
192
193 if (wtot>0) {
194 d /= wtot ;
195 dxx /= wtot ;
196 dzz /= wtot ;
197 dxz /= wtot ;
198 dxx -= xMean * xMean ;
199 dzz -= zMean * zMean ;
200 dxz -= xMean * zMean ;
201 fM02 = 0.5 * (dxx + dzz) + TMath::Sqrt( 0.25 * (dxx - dzz) * (dxx - dzz) + dxz * dxz ) ;
202 fM20 = 0.5 * (dxx + dzz) - TMath::Sqrt( 0.25 * (dxx - dzz) * (dxx - dzz) + dxz * dxz ) ;
203 }
204 else{
205 AliError(Form("Wrong weight %f\n", wtot));
206 d=0. ;
207 fM20=0. ;
208 fM02=0. ;
209 }
210
211 if (d>=0)
212 fDispersion = TMath::Sqrt(d) ;
213 else
214 fDispersion = 0 ;
215
216
217 // Correction for the depth of the shower starting point (TDR p 127)
218 Float_t para = 0.925 ;
219 Float_t parb = 6.52 ;
220
221 TVector3 vInc ;
222 phosgeom->GetIncidentVector(vtx,phosMod,xMean,zMean,vInc) ;
223
224 Float_t depthx = 0.;
225 Float_t depthz = 0.;
226 if (fEnergy>0&&vInc.Y()!=0.) {
227 depthx = ( para * TMath::Log(fEnergy) + parb ) * vInc.X()/TMath::Abs(vInc.Y()) ;
228 depthz = ( para * TMath::Log(fEnergy) + parb ) * vInc.Z()/TMath::Abs(vInc.Y()) ;
229 }
230 else
231 AliError(Form("Wrong amplitude %f\n", fEnergy));
232
233 xMean-= depthx ;
234 zMean-= depthz ;
235
236 //Go to the global system
237 TVector3 gps ;
238 phosgeom->Local2Global(phosMod, xMean, zMean, gps) ;
239 fGlobalPos[0]=gps[0] ;
240 fGlobalPos[1]=gps[1] ;
241 fGlobalPos[2]=gps[2] ;
242}