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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 | ||
28 | const Int_t maxVariant = 8; // size eta grid | |
29 | const Int_t nVec = 10; // size momentum grid | |
30 | const Int_t nPol = 4; // number coefficients of polinom | |
31 | static Double_t etaGrid[maxVariant]={ 0.0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.67}; | |
32 | static Double_t pGrid[nVec]={ 0.2, 0.5, 1.0, 2.0, 3.0, 5.0,10.0,15.0,25.0,40.0}; | |
33 | // c[][] - first index for eta, second for momentum | |
34 | static 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 | ||
44 | ClassImp(AliJetHadronCorrectionv0) | |
45 | ||
46 | AliJetHadronCorrectionv0* AliJetHadronCorrectionv0::fHadrCorr = 0; | |
47 | ||
48 | AliJetHadronCorrectionv0::AliJetHadronCorrectionv0(const char *name,const char *title) | |
49 | :AliJetHadronCorrection(name, title) | |
50 | { | |
51 | fHadrCorr = this; | |
52 | } | |
53 | ||
54 | AliJetHadronCorrectionv0* | |
55 | AliJetHadronCorrectionv0::Instance() | |
56 | { | |
57 | fHadrCorr = new AliJetHadronCorrectionv0(); | |
58 | return fHadrCorr; | |
59 | } | |
60 | ||
61 | Double_t | |
62 | AliJetHadronCorrectionv0::GetEnergy(Double_t pmom, Double_t eta, Int_t /*gid*/) | |
63 | { | |
64 | Int_t iEta=0; // index | |
65 | Double_t etaw = TMath::Abs(eta); | |
66 | if(etaw > etaGrid[maxVariant-1]) etaw = etaGrid[maxVariant-1]; | |
67 | for(Int_t i=0; i<maxVariant; i++) if(eta>=etaGrid[i]) {iEta = i; break;} | |
68 | ||
69 | Double_t e[2], y, pw = pmom; | |
70 | if(pmom > pGrid[nVec-1]) pw = pGrid[nVec-1]; | |
71 | for(Int_t i=0; i<2; i++){ // e for two eta value | |
72 | e[i] = c[iEta][0]; | |
73 | y = 1.; | |
74 | for(Int_t j=1; j<nPol; j++){ | |
75 | y *= pw; | |
76 | e[i] += c[iEta][j]*y; | |
77 | } | |
78 | if(i==0) iEta ++; | |
79 | } | |
80 | ||
81 | Double_t deta = etaGrid[iEta] - etaGrid[iEta-1]; | |
82 | Double_t a = (e[1] - e[0])/deta; // slope | |
83 | Double_t energy = e[0] + a*(eta-etaGrid[iEta-1]); | |
84 | return energy; | |
85 | } |