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