[a5af1df] | 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 |
|
---|
[d1ab205] | 19 | /** \class CscClusterId
|
---|
| 20 | *
|
---|
| 21 | * This module is specific to the CMS paper searching for neutral LLPs in the CMS endcap muon detectors: https://arxiv.org/abs/2107.04838
|
---|
| 22 | * It is implemented based on the cut_based_id.py function provided in the HEPData entry of the paper: https://www.hepdata.net/record/104408
|
---|
[4aec383] | 23 | * to reproduce the cut-based ID efficiency of the CMS paper.
|
---|
[d1ab205] | 24 | *
|
---|
| 25 | * \author Christina Wang
|
---|
| 26 | *
|
---|
| 27 | */
|
---|
[a5af1df] | 28 |
|
---|
| 29 | #include "modules/CscClusterId.h"
|
---|
| 30 |
|
---|
| 31 | #include "classes/DelphesClasses.h"
|
---|
| 32 | #include "classes/DelphesFactory.h"
|
---|
[29b722a] | 33 | #include "classes/DelphesCscClusterFormula.h"
|
---|
[a5af1df] | 34 |
|
---|
| 35 | #include "ExRootAnalysis/ExRootClassifier.h"
|
---|
| 36 | #include "ExRootAnalysis/ExRootFilter.h"
|
---|
| 37 | #include "ExRootAnalysis/ExRootResult.h"
|
---|
| 38 |
|
---|
| 39 | #include "TDatabasePDG.h"
|
---|
| 40 | #include "TFormula.h"
|
---|
| 41 | #include "TLorentzVector.h"
|
---|
| 42 | #include "TMath.h"
|
---|
| 43 | #include "TObjArray.h"
|
---|
| 44 | #include "TRandom3.h"
|
---|
| 45 | #include "TString.h"
|
---|
| 46 |
|
---|
| 47 | #include <algorithm>
|
---|
| 48 | #include <iostream>
|
---|
| 49 | #include <sstream>
|
---|
| 50 | #include <stdexcept>
|
---|
[4aec383] | 51 | #include "assert.h"
|
---|
[a5af1df] | 52 | using namespace std;
|
---|
| 53 |
|
---|
| 54 | //------------------------------------------------------------------------------
|
---|
| 55 |
|
---|
| 56 | CscClusterId::CscClusterId() :
|
---|
[4aec383] | 57 | fFormula(0), fEtaFormula(0), fItInputArray(0)
|
---|
[a5af1df] | 58 | {
|
---|
[29b722a] | 59 | fFormula = new DelphesCscClusterFormula;
|
---|
[4aec383] | 60 | fEtaFormula = new DelphesCscClusterFormula;
|
---|
[a5af1df] | 61 | }
|
---|
| 62 |
|
---|
| 63 | //------------------------------------------------------------------------------
|
---|
| 64 |
|
---|
| 65 | CscClusterId::~CscClusterId()
|
---|
| 66 | {
|
---|
| 67 | if(fFormula) delete fFormula;
|
---|
[4aec383] | 68 | if(fEtaFormula) delete fEtaFormula;
|
---|
[a5af1df] | 69 | }
|
---|
| 70 |
|
---|
| 71 | //------------------------------------------------------------------------------
|
---|
| 72 |
|
---|
| 73 | void CscClusterId::Init()
|
---|
| 74 | {
|
---|
| 75 | // read efficiency formula
|
---|
| 76 |
|
---|
| 77 | fFormula->Compile(GetString("EfficiencyFormula", "1.0"));
|
---|
[4aec383] | 78 | fEtaFormula->Compile(GetString("EtaCutFormula", "1.0"));
|
---|
| 79 | fEtaCutMax = GetDouble("EtaCutMax", 999.0);
|
---|
[a5af1df] | 80 |
|
---|
| 81 | // import input array
|
---|
| 82 |
|
---|
| 83 | fInputArray = ImportArray(GetString("InputArray", "ParticlePropagator/stableParticles"));
|
---|
| 84 | fItInputArray = fInputArray->MakeIterator();
|
---|
| 85 |
|
---|
| 86 | // create output array
|
---|
| 87 |
|
---|
| 88 | fOutputArray = ExportArray(GetString("OutputArray", "stableParticles"));
|
---|
| 89 | }
|
---|
| 90 |
|
---|
| 91 | //------------------------------------------------------------------------------
|
---|
| 92 |
|
---|
| 93 | void CscClusterId::Finish()
|
---|
| 94 | {
|
---|
| 95 | if(fItInputArray) delete fItInputArray;
|
---|
| 96 | }
|
---|
| 97 |
|
---|
| 98 | //------------------------------------------------------------------------------
|
---|
| 99 |
|
---|
| 100 | void CscClusterId::Process()
|
---|
| 101 | {
|
---|
| 102 | Candidate *candidate;
|
---|
| 103 | Double_t Ehad, Eem, decayR, decayZ, NStationEff, eta, eta_cut;
|
---|
| 104 | Int_t avgStation;
|
---|
| 105 | Double_t signPz, cosTheta;
|
---|
| 106 |
|
---|
| 107 | fItInputArray->Reset();
|
---|
| 108 | while((candidate = static_cast<Candidate *>(fItInputArray->Next())))
|
---|
| 109 | {
|
---|
| 110 | const TLorentzVector &momentum = candidate->Momentum;
|
---|
| 111 | const TLorentzVector &candidateDecayPosition = candidate->DecayPosition;
|
---|
| 112 | decayZ = abs(candidateDecayPosition.Z());
|
---|
| 113 | decayR = sqrt(pow(candidateDecayPosition.X(),2)+pow(candidateDecayPosition.Y(),2));
|
---|
| 114 | Ehad = candidate->Ehad;
|
---|
| 115 | Eem = candidate->Eem;
|
---|
| 116 |
|
---|
| 117 | cosTheta = TMath::Abs(momentum.CosTheta());
|
---|
| 118 | signPz = (momentum.Pz() >= 0.0) ? 1.0 : -1.0;
|
---|
| 119 | eta = (cosTheta == 1.0 ? signPz * 999.9 : momentum.Eta());
|
---|
| 120 |
|
---|
[4aec383] | 121 | // calculate the NStation > 1 efficiency, implemented according to Additional Figure 8 in HEPData
|
---|
[a09b75f] | 122 | NStationEff = fFormula->Eval(decayR, decayZ, Ehad);
|
---|
[a5af1df] | 123 |
|
---|
[4aec383] | 124 | // depending on the decay region (station Number), different eta cut is applied, implemented based on cut_based_id.py in HEPData
|
---|
| 125 | float eta_cut = fEtaFormula->Eval(decayR, decayZ);
|
---|
| 126 | if(gRandom->Uniform() > NStationEff*(abs(eta)<fEtaCutMax)+(1.0-NStationEff)*(abs(eta)<eta_cut)) continue;
|
---|
[a5af1df] | 127 |
|
---|
| 128 | fOutputArray->Add(candidate);
|
---|
| 129 | }
|
---|
| 130 | }
|
---|
| 131 |
|
---|
| 132 | //------------------------------------------------------------------------------
|
---|