[5] | 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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