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source: git/modules/TimeSmearing.cc@ 77249aa

Timing
Last change on this file since 77249aa was 9e3f2fb, checked in by michele <michele.selvaggi@…>, 5 years ago

adapted TimeSmearing to neutral particles

  • Property mode set to 100644
File size: 4.1 KB
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1/*
2 * Delphes: a framework for fast simulation of a generic collider experiment
3 * Copyright (C) 2012-2014 Universite catholique de Louvain (UCL), Belgium
4 *
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19/** \class TimeSmearing
20 *
21 * Performs transverse momentum resolution smearing.
22 *
23 * \author P. Demin - UCL, Louvain-la-Neuve
24 *
25 */
26
27#include "modules/TimeSmearing.h"
28
29#include "classes/DelphesClasses.h"
30#include "classes/DelphesFactory.h"
31#include "classes/DelphesFormula.h"
32
33#include "ExRootAnalysis/ExRootClassifier.h"
34#include "ExRootAnalysis/ExRootFilter.h"
35#include "ExRootAnalysis/ExRootResult.h"
36
37#include "TDatabasePDG.h"
38#include "TFormula.h"
39#include "TLorentzVector.h"
40#include "TMath.h"
41#include "TObjArray.h"
42#include "TRandom3.h"
43#include "TString.h"
44
45#include <algorithm>
46#include <iostream>
47#include <sstream>
48#include <stdexcept>
49
50using namespace std;
51
52//------------------------------------------------------------------------------
53
54TimeSmearing::TimeSmearing() :
55 fItInputArray(0), fResolutionFormula(0)
56{
57 fResolutionFormula = new DelphesFormula;
58}
59
60//------------------------------------------------------------------------------
61
62TimeSmearing::~TimeSmearing()
63{
64 if(fResolutionFormula) delete fResolutionFormula;
65}
66
67//------------------------------------------------------------------------------
68
69void TimeSmearing::Init()
70{
71 // read time resolution formula in seconds
72 fResolutionFormula->Compile(GetString("TimeResolution", "30e-12"));
73
74 // import input array
75 fInputArray = ImportArray(GetString("InputArray", "TrackMerger/tracks"));
76 fItInputArray = fInputArray->MakeIterator();
77
78 // create output array
79 fOutputArray = ExportArray(GetString("OutputArray", "tracks"));
80}
81
82//------------------------------------------------------------------------------
83
84void TimeSmearing::Finish()
85{
86 if(fItInputArray) delete fItInputArray;
87}
88
89//------------------------------------------------------------------------------
90
91void TimeSmearing::Process()
92{
93 Candidate *candidate, *mother;
94 Double_t ti,ti_smeared, tf, tf_smeared, dt;
95 Double_t eta, energy;
96 Double_t timeResolution;
97
98
99 const Double_t c_light = 2.99792458E8;
100
101 fItInputArray->Reset();
102 while((candidate = static_cast<Candidate*>(fItInputArray->Next())))
103 {
104 const TLorentzVector &candidatePosition = candidate->Position;
105 const TLorentzVector &candidateMomentum = candidate->Momentum;
106
107 // convert mm in seconds
108 ti = candidate->InitialPosition.T()*1.0E-3/c_light;
109 tf = candidate->Position.T()*1.0E-3/c_light;
110
111 eta = candidatePosition.Eta();
112 energy = candidateMomentum.E();
113 timeResolution = fResolutionFormula->Eval(0.0, eta, 0.0, energy);
114
115 dt = timeResolution*gRandom->Gaus(0, 1);
116 tf_smeared = tf + dt;
117 ti_smeared = ti + dt;
118 mother = candidate;
119 candidate = static_cast<Candidate*>(candidate->Clone());
120 candidate->AddCandidate(mother);
121
122 candidate->Position.SetT(tf_smeared*1.0E3*c_light);
123 candidate->ErrorT = timeResolution*1.0E3*c_light;
124
125 // treating charged and neutral differently:
126 // for charged we smear the time after propagation, and put a dummy value for time at Vertex
127 // since the correct value will be computed after Vertexing4D
128 if(candidate->Charge != 0)
129 // Dummy Value, correct value will be computed by VertexFinderDA4D
130 candidate->InitialPosition.SetT((100+ti)*1.0E3*c_light);
131 else
132 candidate->InitialPosition.SetT(ti_smeared*1.0E3*c_light);
133
134 fOutputArray->Add(candidate);
135
136 }
137}
138
139//------------------------------------------------------------------------------
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