1 | |
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2 | /** \class EnergySmearing |
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3 | * |
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4 | * Performs energy resolution smearing. |
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5 | * |
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6 | * $Date: 2013-02-22 12:03:12 +0100 (Fri, 22 Feb 2013) $ |
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7 | * $Revision: 927 $ |
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8 | * |
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9 | * |
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10 | * \author P. Demin - UCL, Louvain-la-Neuve |
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11 | * |
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12 | */ |
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13 | |
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14 | #include "modules/EnergySmearing.h" |
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15 | |
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16 | #include "classes/DelphesClasses.h" |
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17 | #include "classes/DelphesFactory.h" |
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18 | #include "classes/DelphesFormula.h" |
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19 | |
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20 | #include "ExRootAnalysis/ExRootResult.h" |
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21 | #include "ExRootAnalysis/ExRootFilter.h" |
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22 | #include "ExRootAnalysis/ExRootClassifier.h" |
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23 | |
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24 | #include "TMath.h" |
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25 | #include "TString.h" |
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26 | #include "TFormula.h" |
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27 | #include "TRandom3.h" |
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28 | #include "TObjArray.h" |
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29 | #include "TDatabasePDG.h" |
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30 | #include "TLorentzVector.h" |
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31 | |
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32 | #include <algorithm> |
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33 | #include <stdexcept> |
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34 | #include <iostream> |
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35 | #include <sstream> |
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36 | |
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37 | using namespace std; |
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38 | |
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39 | //------------------------------------------------------------------------------ |
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40 | |
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41 | EnergySmearing::EnergySmearing() : |
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42 | fFormula(0), fItInputArray(0) |
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43 | { |
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44 | fFormula = new DelphesFormula; |
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45 | } |
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46 | |
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47 | //------------------------------------------------------------------------------ |
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48 | |
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49 | EnergySmearing::~EnergySmearing() |
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50 | { |
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51 | if(fFormula) delete fFormula; |
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52 | } |
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53 | |
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54 | //------------------------------------------------------------------------------ |
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55 | |
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56 | void EnergySmearing::Init() |
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57 | { |
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58 | // read resolution formula |
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59 | |
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60 | fFormula->Compile(GetString("ResolutionFormula", "0.0")); |
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61 | |
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62 | // import input array |
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63 | |
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64 | fInputArray = ImportArray(GetString("InputArray", "ParticlePropagator/stableParticles")); |
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65 | fItInputArray = fInputArray->MakeIterator(); |
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66 | |
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67 | // create output array |
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68 | |
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69 | fOutputArray = ExportArray(GetString("OutputArray", "stableParticles")); |
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70 | } |
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71 | |
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72 | //------------------------------------------------------------------------------ |
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73 | |
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74 | void EnergySmearing::Finish() |
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75 | { |
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76 | if(fItInputArray) delete fItInputArray; |
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77 | } |
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78 | |
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79 | //------------------------------------------------------------------------------ |
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80 | |
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81 | void EnergySmearing::Process() |
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82 | { |
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83 | Candidate *candidate, *mother; |
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84 | Double_t energy, eta, phi; |
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85 | |
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86 | fItInputArray->Reset(); |
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87 | while((candidate = static_cast<Candidate*>(fItInputArray->Next()))) |
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88 | { |
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89 | const TLorentzVector &candidatePosition = candidate->Position; |
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90 | const TLorentzVector &candidateMomentum = candidate->Momentum; |
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91 | eta = candidatePosition.Eta(); |
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92 | phi = candidatePosition.Phi(); |
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93 | energy = candidateMomentum.E(); |
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94 | |
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95 | // apply smearing formula |
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96 | energy = gRandom->Gaus(energy, fFormula->Eval(0.0, eta, 0.0, energy)); |
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97 | |
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98 | if(energy <= 0.0) continue; |
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99 | |
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100 | mother = candidate; |
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101 | candidate = static_cast<Candidate*>(candidate->Clone()); |
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102 | eta = candidateMomentum.Eta(); |
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103 | phi = candidateMomentum.Phi(); |
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104 | candidate->Momentum.SetPtEtaPhiE(energy/TMath::CosH(eta), eta, phi, energy); |
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105 | candidate->AddCandidate(mother); |
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106 | |
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107 | fOutputArray->Add(candidate); |
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108 | } |
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109 | } |
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110 | |
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111 | //------------------------------------------------------------------------------ |
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