/*
* Delphes: a framework for fast simulation of a generic collider experiment
* Copyright (C) 2012-2014 Universite catholique de Louvain (UCL), Belgium
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see .
*/
/** \class BTagging
*
* Determines origin of jet,
* applies b-tagging efficiency (miss identification rate) formulas
* and sets b-tagging flags
*
* \author P. Demin - UCL, Louvain-la-Neuve
*
*/
#include "modules/BTagging.h"
#include "classes/DelphesClasses.h"
#include "classes/DelphesFactory.h"
#include "classes/DelphesFormula.h"
#include "ExRootAnalysis/ExRootResult.h"
#include "ExRootAnalysis/ExRootFilter.h"
#include "ExRootAnalysis/ExRootClassifier.h"
#include "TMath.h"
#include "TString.h"
#include "TFormula.h"
#include "TRandom3.h"
#include "TObjArray.h"
#include "TDatabasePDG.h"
#include "TLorentzVector.h"
#include
#include
#include
#include
using namespace std;
//------------------------------------------------------------------------------
class BTaggingPartonClassifier : public ExRootClassifier
{
public:
BTaggingPartonClassifier() {}
Int_t GetCategory(TObject *object);
Double_t fEtaMax, fPTMin;
};
//------------------------------------------------------------------------------
Int_t BTaggingPartonClassifier::GetCategory(TObject *object)
{
Candidate *parton = static_cast(object);
const TLorentzVector &momentum = parton->Momentum;
Int_t pdgCode;
if(momentum.Pt() <= fPTMin || TMath::Abs(momentum.Eta()) > fEtaMax) return -1;
pdgCode = TMath::Abs(parton->PID);
if(pdgCode != 21 && pdgCode > 5) return -1;
return 0;
}
//------------------------------------------------------------------------------
BTagging::BTagging() :
fClassifier(0), fFilter(0),
fItPartonInputArray(0), fItJetInputArray(0)
{
fClassifier = new BTaggingPartonClassifier;
}
//------------------------------------------------------------------------------
BTagging::~BTagging()
{
if(fClassifier) delete fClassifier;
}
//------------------------------------------------------------------------------
void BTagging::Init()
{
map< Int_t, DelphesFormula * >::iterator itEfficiencyMap;
ExRootConfParam param;
DelphesFormula *formula;
Int_t i, size;
fBitNumber = GetInt("BitNumber", 0);
fDeltaR = GetDouble("DeltaR", 0.5);
fClassifier->fPTMin = GetDouble("PartonPTMin", 1.0);
fClassifier->fEtaMax = GetDouble("PartonEtaMax", 2.5);
// read efficiency formulas
param = GetParam("EfficiencyFormula");
size = param.GetSize();
fEfficiencyMap.clear();
for(i = 0; i < size/2; ++i)
{
formula = new DelphesFormula;
formula->Compile(param[i*2 + 1].GetString());
fEfficiencyMap[param[i*2].GetInt()] = formula;
}
// set default efficiency formula
itEfficiencyMap = fEfficiencyMap.find(0);
if(itEfficiencyMap == fEfficiencyMap.end())
{
formula = new DelphesFormula;
formula->Compile("0.0");
fEfficiencyMap[0] = formula;
}
// import input array(s)
fPartonInputArray = ImportArray(GetString("PartonInputArray", "Delphes/partons"));
fItPartonInputArray = fPartonInputArray->MakeIterator();
fFilter = new ExRootFilter(fPartonInputArray);
fJetInputArray = ImportArray(GetString("JetInputArray", "FastJetFinder/jets"));
fItJetInputArray = fJetInputArray->MakeIterator();
}
//------------------------------------------------------------------------------
void BTagging::Finish()
{
map< Int_t, DelphesFormula * >::iterator itEfficiencyMap;
DelphesFormula *formula;
if(fFilter) delete fFilter;
if(fItJetInputArray) delete fItJetInputArray;
if(fItPartonInputArray) delete fItPartonInputArray;
for(itEfficiencyMap = fEfficiencyMap.begin(); itEfficiencyMap != fEfficiencyMap.end(); ++itEfficiencyMap)
{
formula = itEfficiencyMap->second;
if(formula) delete formula;
}
}
//------------------------------------------------------------------------------
void BTagging::Process()
{
Candidate *jet;
Double_t pt, eta, phi, e;
TObjArray *partonArray;
map< Int_t, DelphesFormula * >::iterator itEfficiencyMap;
DelphesFormula *formula;
// select quark and gluons
fFilter->Reset();
partonArray = fFilter->GetSubArray(fClassifier, 0);
if(partonArray == 0) return;
TIter itPartonArray(partonArray);
// loop over all input jets
fItJetInputArray->Reset();
while((jet = static_cast(fItJetInputArray->Next())))
{
const TLorentzVector &jetMomentum = jet->Momentum;
eta = jetMomentum.Eta();
phi = jetMomentum.Phi();
pt = jetMomentum.Pt();
e = jetMomentum.E();
// find an efficiency formula
itEfficiencyMap = fEfficiencyMap.find(jet->Flavor);
if(itEfficiencyMap == fEfficiencyMap.end())
{
itEfficiencyMap = fEfficiencyMap.find(0);
}
formula = itEfficiencyMap->second;
// apply an efficiency formula
jet->BTag |= (gRandom->Uniform() <= formula->Eval(pt, eta, phi, e)) << fBitNumber;
// find an efficiency formula for algo flavor definition
itEfficiencyMap = fEfficiencyMap.find(jet->FlavorAlgo);
if(itEfficiencyMap == fEfficiencyMap.end())
{
itEfficiencyMap = fEfficiencyMap.find(0);
}
formula = itEfficiencyMap->second;
// apply an efficiency formula
jet->BTagAlgo |= (gRandom->Uniform() <= formula->Eval(pt, eta, phi, e)) << fBitNumber;
// find an efficiency formula for phys flavor definition
itEfficiencyMap = fEfficiencyMap.find(jet->FlavorPhys);
if(itEfficiencyMap == fEfficiencyMap.end())
{
itEfficiencyMap = fEfficiencyMap.find(0);
}
formula = itEfficiencyMap->second;
// apply an efficiency formula
jet->BTagPhys |= (gRandom->Uniform() <= formula->Eval(pt, eta, phi, e)) << fBitNumber;
}
}
//------------------------------------------------------------------------------