| 1 |
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| 2 | /** \class MomentumSmearing
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| 3 | *
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| 4 | * Performs transverse momentum resolution smearing.
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| 5 | *
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| 6 | * $Date: 2013-02-13 15:58:53 +0000 (Wed, 13 Feb 2013) $
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| 7 | * $Revision: 911 $
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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/MomentumSmearing.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 | MomentumSmearing::MomentumSmearing() :
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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 | MomentumSmearing::~MomentumSmearing()
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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 MomentumSmearing::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 MomentumSmearing::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 MomentumSmearing::Process()
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| 82 | {
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| 83 | Candidate *candidate, *mother;
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| 84 | Double_t pt, 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 | pt = candidateMomentum.Pt();
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| 94 |
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| 95 | // apply smearing formula
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| 96 | pt = gRandom->Gaus(pt, fFormula->Eval(pt, eta) * pt);
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| 97 |
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| 98 | if(pt <= 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(pt, eta, phi, pt*TMath::CosH(eta));
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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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