adding rho dependence on leading track (M. Verweij)
[u/mrichter/AliRoot.git] / JETAN / AliJetHadronCorrectionv0.cxx
CommitLineData
4a01bb2c 1/**************************************************************************
2 * Copyright(c) 1998-2002, 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/* $Id$ */
18
19//===============================================================
20// To be modified for hadron correction using particle ID and track merging
21// Author : magali.estienne@ires.in2p3.fr
22//===============================================================
23
24
25// --- AliRoot header files ---
26#include "AliJetHadronCorrectionv0.h"
27
28const Int_t maxVariant = 8; // size eta grid
e36a3f22 29const Int_t nVec = 11; // size momentum grid
30const Int_t nPol = 4; // number coefficients of polynom
4a01bb2c 31static Double_t etaGrid[maxVariant]={ 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.67};
e36a3f22 32static Double_t pGrid[nVec]={ 0.5, 1.0, 2.0, 3.0, 5.0, 10.0, 20.0, 30.0, 50.0, 70.0, 100.0};
4a01bb2c 33// c[][] - first index for eta, second for momentum
34static Double_t c[maxVariant][nPol] ={
35 {1.305705e-01, 3.725653e-01, -1.219962e-02, 1.806235e-04},
36 {1.296153e-01, 3.827408e-01, -1.238640e-02, 1.822804e-04},
37 {1.337690e-01, 3.797454e-01, -1.245227e-02, 1.848243e-04},
38 {1.395796e-01, 3.623994e-01, -9.196803e-03, 1.243278e-04},
39 {1.457184e-01, 3.753655e-01, -1.035324e-02, 1.473447e-04},
40 {1.329164e-01, 4.219044e-01, -1.310515e-02, 1.948883e-04},
41 {8.136581e-02, 4.646087e-01, -1.531917e-02, 2.274749e-04},
42 {1.119836e-01, 4.262497e-01, -1.160125e-02, 1.628738e-04} };
43
44ClassImp(AliJetHadronCorrectionv0)
45
46AliJetHadronCorrectionv0* AliJetHadronCorrectionv0::fHadrCorr = 0;
47
48AliJetHadronCorrectionv0::AliJetHadronCorrectionv0(const char *name,const char *title)
49 :AliJetHadronCorrection(name, title)
50{
51 fHadrCorr = this;
52}
53
54AliJetHadronCorrectionv0*
55AliJetHadronCorrectionv0::Instance()
56{
57 fHadrCorr = new AliJetHadronCorrectionv0();
58 return fHadrCorr;
59}
60
61Double_t
08c28025 62AliJetHadronCorrectionv0::GetEnergy(Double_t pmom, Double_t eta, Int_t /*gid*/)
4a01bb2c 63{
1240edf5 64// Get energy for momentum pmom and pseudorapidity eta
4a01bb2c 65 Int_t iEta=0; // index
66 Double_t etaw = TMath::Abs(eta);
67 if(etaw > etaGrid[maxVariant-1]) etaw = etaGrid[maxVariant-1];
68 for(Int_t i=0; i<maxVariant; i++) if(eta>=etaGrid[i]) {iEta = i; break;}
69
70 Double_t e[2], y, pw = pmom;
71 if(pmom > pGrid[nVec-1]) pw = pGrid[nVec-1];
72 for(Int_t i=0; i<2; i++){ // e for two eta value
73 e[i] = c[iEta][0];
74 y = 1.;
75 for(Int_t j=1; j<nPol; j++){
76 y *= pw;
77 e[i] += c[iEta][j]*y;
78 }
79 if(i==0) iEta ++;
80 }
81
82 Double_t deta = etaGrid[iEta] - etaGrid[iEta-1];
83 Double_t a = (e[1] - e[0])/deta; // slope
84 Double_t energy = e[0] + a*(eta-etaGrid[iEta-1]);
85 return energy;
86}