[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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[af88093] | 19 | /** \class TimeSmearing
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| 20 | *
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| 21 | * Performs transverse momentum resolution smearing.
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| 22 | *
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| 23 | * \author P. Demin - 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/TimeSmearing.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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[af88093] | 36 |
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| 37 | #include "TDatabasePDG.h"
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[341014c] | 38 | #include "TFormula.h"
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[af88093] | 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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[af88093] | 44 |
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[6cdc544] | 45 | #include <algorithm>
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[af88093] | 46 | #include <iostream>
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| 47 | #include <sstream>
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[341014c] | 48 | #include <stdexcept>
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[af88093] | 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 | TimeSmearing::TimeSmearing() :
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[9e3f2fb] | 55 | fItInputArray(0), fResolutionFormula(0)
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[af88093] | 56 | {
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[9e3f2fb] | 57 | fResolutionFormula = new DelphesFormula;
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[af88093] | 58 | }
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| 59 |
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| 60 | //------------------------------------------------------------------------------
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| 61 |
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| 62 | TimeSmearing::~TimeSmearing()
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[9e3f2fb] | 63 | {
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| 64 | if(fResolutionFormula) delete fResolutionFormula;
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[af88093] | 65 | }
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| 66 |
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| 67 | //------------------------------------------------------------------------------
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| 68 |
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| 69 | void TimeSmearing::Init()
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| 70 | {
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[9e3f2fb] | 71 | // read time resolution formula in seconds
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| 72 | fResolutionFormula->Compile(GetString("TimeResolution", "30e-12"));
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[af88093] | 73 |
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[2b5ff2c] | 74 | // import input array
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[9e3f2fb] | 75 | fInputArray = ImportArray(GetString("InputArray", "TrackMerger/tracks"));
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[af88093] | 76 | fItInputArray = fInputArray->MakeIterator();
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| 77 |
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[9e3f2fb] | 78 | // create output array
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| 79 | fOutputArray = ExportArray(GetString("OutputArray", "tracks"));
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[af88093] | 80 | }
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| 81 |
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| 82 | //------------------------------------------------------------------------------
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| 83 |
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| 84 | void TimeSmearing::Finish()
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| 85 | {
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| 86 | if(fItInputArray) delete fItInputArray;
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| 87 | }
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| 88 |
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| 89 | //------------------------------------------------------------------------------
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| 90 |
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| 91 | void TimeSmearing::Process()
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| 92 | {
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| 93 | Candidate *candidate, *mother;
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[9e3f2fb] | 94 | Double_t ti,ti_smeared, tf, tf_smeared, dt;
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| 95 | Double_t eta, energy;
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[6049672] | 96 | Double_t timeResolution;
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[2b5ff2c] | 97 |
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| 98 |
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[af88093] | 99 | const Double_t c_light = 2.99792458E8;
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[6cdc544] | 100 |
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[af88093] | 101 | fItInputArray->Reset();
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[2b5ff2c] | 102 | while((candidate = static_cast<Candidate*>(fItInputArray->Next())))
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[af88093] | 103 | {
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[2b5ff2c] | 104 | const TLorentzVector &candidatePosition = candidate->Position;
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| 105 | const TLorentzVector &candidateMomentum = candidate->Momentum;
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[9e3f2fb] | 106 |
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| 107 | // convert mm in seconds
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| 108 | ti = candidate->InitialPosition.T()*1.0E-3/c_light;
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| 109 | tf = candidate->Position.T()*1.0E-3/c_light;
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| 110 |
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[2b5ff2c] | 111 | eta = candidatePosition.Eta();
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[9e3f2fb] | 112 | energy = candidateMomentum.E();
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| 113 | timeResolution = fResolutionFormula->Eval(0.0, eta, 0.0, energy);
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| 114 |
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| 115 | dt = timeResolution*gRandom->Gaus(0, 1);
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| 116 | tf_smeared = tf + dt;
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| 117 | ti_smeared = ti + dt;
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| 118 | mother = candidate;
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| 119 | candidate = static_cast<Candidate*>(candidate->Clone());
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| 120 | candidate->AddCandidate(mother);
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| 121 |
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| 122 | candidate->Position.SetT(tf_smeared*1.0E3*c_light);
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| 123 | candidate->ErrorT = timeResolution*1.0E3*c_light;
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| 124 |
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| 125 | // treating charged and neutral differently:
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| 126 | // for charged we smear the time after propagation, and put a dummy value for time at Vertex
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| 127 | // since the correct value will be computed after Vertexing4D
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[7939c6c] | 128 | if(candidate->Charge != 0)
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[9e3f2fb] | 129 | // Dummy Value, correct value will be computed by VertexFinderDA4D
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| 130 | candidate->InitialPosition.SetT((100+ti)*1.0E3*c_light);
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[7939c6c] | 131 | else
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[9e3f2fb] | 132 | candidate->InitialPosition.SetT(ti_smeared*1.0E3*c_light);
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| 133 |
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| 134 | fOutputArray->Add(candidate);
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| 135 |
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[af88093] | 136 | }
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| 137 | }
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| 138 |
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| 139 | //------------------------------------------------------------------------------
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