[b443089] | 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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[1fa50c2] | 4 | *
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[b443089] | 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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[1fa50c2] | 9 | *
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[b443089] | 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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[1fa50c2] | 14 | *
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[b443089] | 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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[a0431dc] | 19 | /** \class ImpactParameterSmearing
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| 20 | *
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| 21 | * Performs transverse impact parameter 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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[4d753a1] | 26 |
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[a0431dc] | 27 | #include "modules/ImpactParameterSmearing.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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[341014c] | 34 | #include "ExRootAnalysis/ExRootFilter.h"
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| 35 | #include "ExRootAnalysis/ExRootResult.h"
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[a0431dc] | 36 |
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| 37 | #include "TDatabasePDG.h"
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[341014c] | 38 | #include "TFormula.h"
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[a0431dc] | 39 | #include "TLorentzVector.h"
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[341014c] | 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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[a0431dc] | 44 |
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[4d753a1] | 45 | #include <algorithm>
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[a0431dc] | 46 | #include <iostream>
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| 47 | #include <sstream>
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[341014c] | 48 | #include <stdexcept>
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[a0431dc] | 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 | ImpactParameterSmearing::ImpactParameterSmearing() :
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| 55 | fFormula(0), fItInputArray(0)
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| 56 | {
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| 57 | fFormula = new DelphesFormula;
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| 58 | }
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| 59 |
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| 60 | //------------------------------------------------------------------------------
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| 61 |
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| 62 | ImpactParameterSmearing::~ImpactParameterSmearing()
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| 63 | {
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| 64 | if(fFormula) delete fFormula;
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| 65 | }
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| 66 |
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| 67 | //------------------------------------------------------------------------------
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| 68 |
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| 69 | void ImpactParameterSmearing::Init()
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| 70 | {
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| 71 | // read resolution formula
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| 72 |
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| 73 | fFormula->Compile(GetString("ResolutionFormula", "0.0"));
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| 74 |
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| 75 | // import input array
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| 76 |
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| 77 | fInputArray = ImportArray(GetString("InputArray", "TrackMerger/tracks"));
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| 78 | fItInputArray = fInputArray->MakeIterator();
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| 79 |
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| 80 | // create output array
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| 81 |
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| 82 | fOutputArray = ExportArray(GetString("OutputArray", "tracks"));
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| 83 | }
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| 84 |
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| 85 | //------------------------------------------------------------------------------
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| 86 |
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| 87 | void ImpactParameterSmearing::Finish()
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| 88 | {
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| 89 | if(fItInputArray) delete fItInputArray;
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| 90 | }
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| 91 |
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| 92 | //------------------------------------------------------------------------------
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| 93 |
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| 94 | void ImpactParameterSmearing::Process()
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| 95 | {
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| 96 | Candidate *candidate, *particle, *mother;
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[632da30] | 97 | Double_t xd, yd, zd, d0, sx, sy, sz, dd0;
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[95aa610] | 98 | Double_t pt, eta, px, py, phi, e;
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[a0431dc] | 99 |
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| 100 | fItInputArray->Reset();
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[341014c] | 101 | while((candidate = static_cast<Candidate *>(fItInputArray->Next())))
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[a0431dc] | 102 | {
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[4d753a1] | 103 |
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[632da30] | 104 | // take momentum before smearing (otherwise apply double smearing on d0)
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[341014c] | 105 | particle = static_cast<Candidate *>(candidate->GetCandidates()->At(0));
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[4d753a1] | 106 |
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[a0431dc] | 107 | const TLorentzVector &candidateMomentum = particle->Momentum;
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[4d753a1] | 108 |
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[a0431dc] | 109 | eta = candidateMomentum.Eta();
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| 110 | pt = candidateMomentum.Pt();
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[95aa610] | 111 | phi = candidateMomentum.Phi();
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| 112 | e = candidateMomentum.E();
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[341014c] | 113 |
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[a0431dc] | 114 | px = candidateMomentum.Px();
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| 115 | py = candidateMomentum.Py();
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[4d753a1] | 116 |
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[a0431dc] | 117 | // calculate coordinates of closest approach to track circle in transverse plane xd, yd, zd
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[341014c] | 118 | xd = candidate->Xd;
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| 119 | yd = candidate->Yd;
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| 120 | zd = candidate->Zd;
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[4d753a1] | 121 |
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| 122 | // calculate smeared values
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[95aa610] | 123 | sx = gRandom->Gaus(0.0, fFormula->Eval(pt, eta, phi, e));
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| 124 | sy = gRandom->Gaus(0.0, fFormula->Eval(pt, eta, phi, e));
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| 125 | sz = gRandom->Gaus(0.0, fFormula->Eval(pt, eta, phi, e));
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[4d753a1] | 126 |
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[a0431dc] | 127 | xd += sx;
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| 128 | yd += sy;
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[4d753a1] | 129 | zd += sz;
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| 130 |
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| 131 | // calculate impact parameter (after-smearing)
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[341014c] | 132 | d0 = (xd * py - yd * px) / pt;
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[4d753a1] | 133 |
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[632da30] | 134 | dd0 = gRandom->Gaus(0.0, fFormula->Eval(pt, eta, phi, e));
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[4d753a1] | 135 |
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| 136 | // fill smeared values in candidate
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[a0431dc] | 137 | mother = candidate;
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[4d753a1] | 138 |
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[341014c] | 139 | candidate = static_cast<Candidate *>(candidate->Clone());
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[e4c3fef] | 140 | candidate->Xd = xd;
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| 141 | candidate->Yd = yd;
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| 142 | candidate->Zd = zd;
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[4d753a1] | 143 |
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[632da30] | 144 | candidate->D0 = d0;
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| 145 | candidate->ErrorD0 = dd0;
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[4d753a1] | 146 |
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[a0431dc] | 147 | candidate->AddCandidate(mother);
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| 148 | fOutputArray->Add(candidate);
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| 149 | }
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| 150 | }
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| 151 |
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| 152 | //------------------------------------------------------------------------------
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