BTaggingTools

Tools for b-tagging scale factors and efficiencies

Properties

Name	default
m_name + "_Tagger"	"CSVv2"
m_name + "_WorkingPoint"	"Loose"
m_name + "_CsvFile",	sframe_dir + "/../BTaggingTools/csv/CSVv2.csv"
m_name + "_MeasurementType_udsg"	"comb"
m_name + "_MeasurementType_bc"	"mujets"
m_name + "_EffHistDirectory"	"bTagEff"
m_name + "_EffFile"	sframe_dir + "/../BTaggingTools/efficiencies/bTagEffs.root"

Usage

header file

#include "../BTaggingTools/include/BTaggingScaleTool.h"
[..]

private:
  BTaggingScaleTool m_bTaggingScaleTool;

[..]

implementation

constructor:

VHAnalysis::VHAnalysis()
 : SCycleBase()
 , [..]
 , m_bTaggingScaleTool( this )
{

In BeginInputData( const SInputData& id ):

// b-tagging tool initialisation
m_bTaggingScaleTool.BeginInputData( id );

// if you want to fill efficiencies later:
if (m_isSignal) {
  // b-tagging efficiencies
  m_bTaggingScaleTool.bookHistograms();
}

In ExecuteEvent(), after you've performed some kind of signal selection:

if (m_isSignal) {
  std::vector<UZH::Jet> selectedJets;
  selectedJets.push_back(vectorJet);
  selectedJets.push_back(higgsJet);
  m_bTaggingScaleTool.fillEfficiencies(selectedJets);
  m_bTaggingScaleTool.fillPrunedSubjetEfficiencies(selectedJets);
}

Furthermore, it is recommended to use the working points defined in the BTaggingScaleTool to identify if a jet is b-tagged, e.g.:

if (m_bTaggingScaleTool.isTagged(higgsJet.subjet_pruned_csv()[i])) {
  ++nTaggedSubjets;
}

To get the scale factor, pass either a vector of UZH::Jet or individual UZH::Jet, mind the different functions for subjet and normal jet b-tagging:

if (!m_isData) {
  b_weight = getEventWeight(); // could be pileup weights etc.
  std::vector<UZH::Jet> selectedJets;
  selectedJets.push_back(vectorJet);
  selectedJets.push_back(higgsJet);
  // b_weightBtag = m_bTaggingScaleTool.getScaleFactor(selectedJets); // event b-tag SF weight
  b_weightBtag = m_bTaggingScaleTool.getPrunedSubjetScaleFactor(selectedJets); // event b-tag SF weight
    
    b_weight *= b_weightBtag;
  }
}

XML

Don't forget to add the shared library to the XML files!