| 1 | /*
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| 2 | * Delphes: a framework for fast simulation of a generic collider experiment
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| 3 | * Copyright (C) 2012-2014 Universite catholique de Louvain (UCL), Belgium
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| 4 | *
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| 5 | * This program is free software: you can redistribute it and/or modify
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| 6 | * it under the terms of the GNU General Public License as published by
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| 7 | * the Free Software Foundation, either version 3 of the License, or
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| 8 | * (at your option) any later version.
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| 9 | *
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| 10 | * This program is distributed in the hope that it will be useful,
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | * GNU General Public License for more details.
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| 14 | *
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| 15 | * You should have received a copy of the GNU General Public License
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| 16 | * along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 17 | */
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| 18 |
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| 19 | /** \class AngularSmearing
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| 20 | *
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| 21 | * Performs transverse angular resolution smearing.
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| 22 | *
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| 23 | * \author M. Selvaggi - UCL, Louvain-la-Neuve
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| 24 | *
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| 25 | */
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| 26 |
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| 27 | #include "modules/AngularSmearing.h"
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| 28 |
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| 29 | #include "classes/DelphesClasses.h"
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| 30 | #include "classes/DelphesFactory.h"
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| 31 | #include "classes/DelphesFormula.h"
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| 32 |
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| 33 | #include "ExRootAnalysis/ExRootClassifier.h"
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| 34 | #include "ExRootAnalysis/ExRootFilter.h"
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| 35 | #include "ExRootAnalysis/ExRootResult.h"
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| 36 |
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| 37 | #include "TDatabasePDG.h"
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| 38 | #include "TFormula.h"
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| 39 | #include "TLorentzVector.h"
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| 40 | #include "TMath.h"
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| 41 | #include "TObjArray.h"
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| 42 | #include "TRandom3.h"
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| 43 | #include "TString.h"
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| 44 |
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| 45 | #include <algorithm>
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| 46 | #include <iostream>
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| 47 | #include <sstream>
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| 48 | #include <stdexcept>
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| 49 |
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| 50 | using namespace std;
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| 51 |
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| 52 | //------------------------------------------------------------------------------
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| 53 |
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| 54 | AngularSmearing::AngularSmearing() :
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| 55 | fFormulaEta(0), fFormulaPhi(0), fItInputArray(0)
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| 56 | {
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| 57 | fFormulaEta = new DelphesFormula;
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| 58 | fFormulaPhi = new DelphesFormula;
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| 59 | }
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| 60 |
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| 61 | //------------------------------------------------------------------------------
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| 62 |
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| 63 | AngularSmearing::~AngularSmearing()
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| 64 | {
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| 65 | if(fFormulaEta) delete fFormulaEta;
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| 66 | if(fFormulaPhi) delete fFormulaPhi;
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| 67 | }
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| 68 |
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| 69 | //------------------------------------------------------------------------------
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| 70 |
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| 71 | void AngularSmearing::Init()
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| 72 | {
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| 73 | // read resolution formula
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| 74 |
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| 75 | fFormulaEta->Compile(GetString("EtaResolutionFormula", "0.0"));
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| 76 | fFormulaPhi->Compile(GetString("PhiResolutionFormula", "0.0"));
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| 77 |
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| 78 | // import input array
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| 79 |
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| 80 | fInputArray = ImportArray(GetString("InputArray", "ParticlePropagator/stableParticles"));
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| 81 | fItInputArray = fInputArray->MakeIterator();
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| 82 |
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| 83 | // create output array
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| 84 |
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| 85 | fOutputArray = ExportArray(GetString("OutputArray", "stableParticles"));
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| 86 | }
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| 87 |
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| 88 | //------------------------------------------------------------------------------
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| 89 |
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| 90 | void AngularSmearing::Finish()
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| 91 | {
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| 92 | if(fItInputArray) delete fItInputArray;
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| 93 | }
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| 94 |
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| 95 | //------------------------------------------------------------------------------
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| 96 |
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| 97 | void AngularSmearing::Process()
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| 98 | {
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| 99 | Candidate *candidate, *mother;
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| 100 | Double_t pt, eta, phi, e, m;
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| 101 |
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| 102 | fItInputArray->Reset();
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| 103 | while((candidate = static_cast<Candidate *>(fItInputArray->Next())))
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| 104 | {
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| 105 | const TLorentzVector &candidateMomentum = candidate->Momentum;
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| 106 | eta = candidateMomentum.Eta();
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| 107 | phi = candidateMomentum.Phi();
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| 108 | pt = candidateMomentum.Pt();
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| 109 | e = candidateMomentum.E();
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| 110 | m = candidateMomentum.M();
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| 111 |
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| 112 | // apply smearing formula for eta,phi
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| 113 | eta = gRandom->Gaus(eta, fFormulaEta->Eval(pt, eta, phi, e, candidate));
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| 114 | phi = gRandom->Gaus(phi, fFormulaPhi->Eval(pt, eta, phi, e, candidate));
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| 115 |
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| 116 | if(pt <= 0.0) continue;
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| 117 |
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| 118 | mother = candidate;
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| 119 | candidate = static_cast<Candidate *>(candidate->Clone());
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| 120 | candidate->Momentum.SetPtEtaPhiM(pt, eta, phi, m);
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| 121 | candidate->AddCandidate(mother);
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| 122 |
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| 123 | fOutputArray->Add(candidate);
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| 124 | }
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| 125 | }
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| 126 |
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| 127 | //------------------------------------------------------------------------------
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