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source: git/modules/EnergySmearing.cc@ 9cc5aeb

Last change on this file since 9cc5aeb was fd4b326, checked in by michele <michele.selvaggi@…>, 3 years ago

tracks have now montecarlo mass

  • Property mode set to 100644
File size: 3.7 KB
Line 
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 EnergySmearing
20 *
21 * Performs energy resolution smearing.
22 *
23 * \author P. Demin - UCL, Louvain-la-Neuve
24 *
25 */
26
27#include "modules/EnergySmearing.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
54EnergySmearing::EnergySmearing() :
55 fFormula(0), fItInputArray(0)
56{
57 fFormula = new DelphesFormula;
58}
59
60//------------------------------------------------------------------------------
61
62EnergySmearing::~EnergySmearing()
63{
64 if(fFormula) delete fFormula;
65}
66
67//------------------------------------------------------------------------------
68
69void EnergySmearing::Init()
70{
71 // read resolution formula
72
73 fFormula->Compile(GetString("ResolutionFormula", "0.0"));
74
75 // import input array
76
77 fInputArray = ImportArray(GetString("InputArray", "ParticlePropagator/stableParticles"));
78 fItInputArray = fInputArray->MakeIterator();
79
80 // create output array
81
82 fOutputArray = ExportArray(GetString("OutputArray", "stableParticles"));
83}
84
85//------------------------------------------------------------------------------
86
87void EnergySmearing::Finish()
88{
89 if(fItInputArray) delete fItInputArray;
90}
91
92//------------------------------------------------------------------------------
93
94void EnergySmearing::Process()
95{
96 Candidate *candidate, *mother;
97 Double_t pt, energy, eta, phi, m;
98
99 fItInputArray->Reset();
100 while((candidate = static_cast<Candidate *>(fItInputArray->Next())))
101 {
102 const TLorentzVector &candidatePosition = candidate->Position;
103 const TLorentzVector &candidateMomentum = candidate->Momentum;
104
105 pt = candidatePosition.Pt();
106 eta = candidatePosition.Eta();
107 phi = candidatePosition.Phi();
108 energy = candidateMomentum.E();
109 m = candidateMomentum.M();
110
111 // apply smearing formula
112 energy = gRandom->Gaus(energy, fFormula->Eval(pt, eta, phi, energy));
113
114 if(energy <= 0.0) continue;
115
116 mother = candidate;
117 candidate = static_cast<Candidate *>(candidate->Clone());
118 eta = candidateMomentum.Eta();
119 phi = candidateMomentum.Phi();
120 pt = (energy > m) ? TMath::Sqrt(energy*energy - m*m)/TMath::CosH(eta) : 0;
121 candidate->Momentum.SetPtEtaPhiE(pt, eta, phi, energy);
122 candidate->TrackResolution = fFormula->Eval(pt, eta, phi, energy) / candidateMomentum.E();
123 candidate->AddCandidate(mother);
124
125 fOutputArray->Add(candidate);
126 }
127}
128
129//------------------------------------------------------------------------------
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