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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 // Extension to Pi0FlowMC, mimicing AliPHOSHijingEfficiency
17 // by Dmitri Peressounko, 05.02.2013
18 // Authors: Henrik Qvigstad, Dmitri Peressounko
19 // Date   : 05.04.2013
20 /* $Id$ */
21
22 #include "AliStack.h"
23 #include "TParticle.h"
24 #include "AliCaloPhoton.h"
25
26 #include "AliAnalysisTaskPi0FlowMCHijing.h"
27
28 ClassImp(AliAnalysisTaskPi0FlowMCHijing);
29
30 AliAnalysisTaskPi0FlowMCHijing::AliAnalysisTaskPi0FlowMCHijing(const char* name, AliAnalysisTaskPi0Flow::Period period)
31 : AliAnalysisTaskPi0FlowMC(name, period)
32 {
33 }
34
35 AliAnalysisTaskPi0FlowMCHijing::~AliAnalysisTaskPi0FlowMCHijing()
36 {
37 }
38
39
40 Double_t AliAnalysisTaskPi0FlowMCHijing::PrimaryWeight(Int_t primary)
41 {
42   //Check who is the primary and introduce weight to correct primary spectrum
43   
44   if(primary<0 || primary>=fStack->GetNtrack())
45     return 1 ;
46   //trace primaries up to IP
47   TParticle* particle =  fStack->Particle(primary);
48   Double_t r=particle->R() ;
49   Int_t mother = particle->GetFirstMother() ;
50   while(mother>-1){
51     if(r<1. && particle->GetPdgCode()==111)
52       break ;
53     particle =  fStack->Particle(mother);
54     mother = particle->GetFirstMother() ;
55     r=particle->R() ;
56   }
57
58   return TMath::Max(0.,PrimaryParticleWeight(particle)) ;
59 }
60
61
62 Double_t AliAnalysisTaskPi0FlowMCHijing::PrimaryParticleWeight(TParticle* particle)
63 {
64   Int_t pdg = particle->GetPdgCode() ;
65   Int_t type=0 ;
66   if(pdg == 111 || TMath::Abs(pdg)==211){
67     type =1 ;
68   }
69   else{
70     if(TMath::Abs(pdg)<1000){ //Kaon-like
71       type =2 ;    
72     }
73     else
74       type = 3;  //baryons
75   }
76     
77   Double_t pt = particle->Pt() ;
78   if(type==1){
79    if(fCentBin==0) //0-5
80      return (1.662990+1.140890*pt-0.192088*pt*pt)/(1.-0.806630*pt+0.304771*pt*pt)+0.141690*pt ;
81    if(fCentBin==1) //5-10
82      return (1.474351+0.791492*pt-0.066369*pt*pt)/(1.-0.839338*pt+0.317312*pt*pt)+0.093289*pt ;
83    if(fCentBin==2) //10-20
84      return (1.174728+0.959681*pt-0.137695*pt*pt)/(1.-0.788873*pt+0.299538*pt*pt)+0.128759*pt ; 
85    if(fCentBin==3) //20-40
86      return (0.927335+0.475349*pt+0.004364*pt*pt)/(1.-0.817966*pt+0.309787*pt*pt)+0.086899*pt ; 
87    if(fCentBin==4) //40-60
88      return (0.676878+0.190680*pt+0.077031*pt*pt)/(1.-0.790623*pt+0.305183*pt*pt)+0.064510*pt ; 
89    if(fCentBin==5) //60-80
90      return (0.684726-0.606262*pt+0.409963*pt*pt)/(1.-1.080061*pt+0.456933*pt*pt)+0.005151*pt ; 
91   }
92   if(type==2){
93    if(fCentBin==0) //0-5
94      return (-0.417131+2.253936*pt-0.337731*pt*pt)/(1.-0.909892*pt+0.316820*pt*pt)+0.157312*pt ;
95    if(fCentBin==1) //5-10
96      return (-0.352275+1.844466*pt-0.248598*pt*pt)/(1.-0.897048*pt+0.316462*pt*pt)+0.132461*pt ; 
97    if(fCentBin==2) //10-20
98      return (-0.475481+1.975108*pt-0.336013*pt*pt)/(1.-0.801028*pt+0.276705*pt*pt)+0.188164*pt ; 
99    if(fCentBin==3) //20-40
100      return (-0.198954+1.068789*pt-0.103540*pt*pt)/(1.-0.848354*pt+0.299209*pt*pt)+0.112939*pt ; 
101    if(fCentBin==4) //40-60
102      return (-0.111052+0.664041*pt-0.019717*pt*pt)/(1.-0.804916*pt+0.300779*pt*pt)+0.095784*pt ;
103    if(fCentBin==5) //0-5
104      return (0.202788-0.439832*pt+0.564585*pt*pt)/(1.-1.254029*pt+0.679444*pt*pt)+0.016235*pt ;
105   }
106   if(type==3){
107    if(fCentBin==0) //0-5
108      return (-1.312732+2.743568*pt-0.375775*pt*pt)/(1.-0.717533*pt+0.164694*pt*pt)+0.164445*pt ;
109    if(fCentBin==1) //5-10
110      return (-1.229425+2.585889*pt-0.330164*pt*pt)/(1.-0.715892*pt+0.167386*pt*pt)+0.133085*pt ; 
111    if(fCentBin==2) //10-20
112      return (-1.135677+2.397489*pt-0.320355*pt*pt)/(1.-0.709312*pt+0.164350*pt*pt)+0.146095*pt ; 
113    if(fCentBin==3) //20-40
114      return (-0.889993+1.928263*pt-0.220785*pt*pt)/(1.-0.715991*pt+0.174729*pt*pt)+0.095098*pt ; 
115    if(fCentBin==4) //40-60
116      return (-0.539237+1.329118*pt-0.115439*pt*pt)/(1.-0.722906*pt+0.186832*pt*pt)+0.059267*pt ; 
117    if(fCentBin==5) //60-80
118      return (-0.518126+1.327628*pt-0.130881*pt*pt)/(1.-0.665649*pt+0.184300*pt*pt)+0.081701*pt ;   
119   }
120   return 1. ;  
121 }