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