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Rivet analyses reference
MC_ZJETS
Monte Carlo validation observables for $Z[e^+ \, e^-]$ + jets production
Experiment: ()
Status: VALIDATED
Authors:
No references listed
Beams: * *
Beam energies: ANY
Run details:
- $e^+ e^-$ + jets analysis. Needs mass cut on lepton pair to avoid photon singularity, e.g. a min range of $66 < m_{ee} < 116$ GeV
Available observables are the pT of jets 1-4, jet multiplicity, $\Delta\eta(Z, \text{jet1})$, $\Delta R(\text{jet2}, \text{jet3})$, differential jet rates 0->1, 1->2, 2->3, 3->4, and integrated 0--4 jet rates.
Source code:
MC_ZJETS.cc
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127 | // -*- C++ -*-
#include "Rivet/Analyses/MC_JetAnalysis.hh"
#include "Rivet/Projections/ZFinder.hh"
#include "Rivet/Projections/FastJets.hh"
namespace Rivet {
/// @brief MC validation analysis for Z + jets events
class MC_ZJETS : public MC_JetAnalysis {
public:
/// Default constructor
MC_ZJETS(string name = "MC_ZJETS")
: MC_JetAnalysis(name, 4, "Jets")
{
_dR=0.2;
_lepton=PID::ELECTRON;
}
/// @name Analysis methods
//@{
/// Initialize
void init() {
FinalState fs;
Cut cut = Cuts::abseta < 3.5 && Cuts::pT > 25*GeV;
ZFinder zfinder(fs, cut, _lepton, 65*GeV, 115*GeV, _dR, ZFinder::CLUSTERNODECAY, ZFinder::TRACK);
declare(zfinder, "ZFinder");
FastJets jetpro(zfinder.remainingFinalState(), FastJets::ANTIKT, 0.4);
declare(jetpro, "Jets");
_h_Z_jet1_deta = bookHisto1D("Z_jet1_deta", 50, -5, 5);
_h_Z_jet1_dR = bookHisto1D("Z_jet1_dR", 25, 0.5, 7.0);
MC_JetAnalysis::init();
}
/// Do the analysis
void analyze(const Event & e) {
const ZFinder& zfinder = apply<ZFinder>(e, "ZFinder");
if (zfinder.bosons().size() != 1) vetoEvent;
const FourMomentum& zmom = zfinder.bosons()[0].momentum();
const Jets& jets = apply<FastJets>(e, "Jets").jetsByPt(_jetptcut);
if (jets.size() > 0) {
const double weight = e.weight();
_h_Z_jet1_deta->fill(zmom.eta()-jets[0].eta(), weight);
_h_Z_jet1_dR->fill(deltaR(zmom, jets[0].momentum()), weight);
}
MC_JetAnalysis::analyze(e);
}
/// Finalize
void finalize() {
scale(_h_Z_jet1_deta, crossSection()/picobarn/sumOfWeights());
scale(_h_Z_jet1_dR, crossSection()/picobarn/sumOfWeights());
MC_JetAnalysis::finalize();
}
//@}
protected:
/// @name Parameters for specialised e/mu and dressed/bare subclassing
//@{
double _dR;
PdgId _lepton;
//@}
private:
/// @name Histograms
//@{
Histo1DPtr _h_Z_jet1_deta;
Histo1DPtr _h_Z_jet1_dR;
//@}
};
struct MC_ZJETS_EL : public MC_ZJETS {
MC_ZJETS_EL() : MC_ZJETS("MC_ZJETS_EL") {
_dR = 0.2;
_lepton = PID::ELECTRON;
}
};
struct MC_ZJETS_EL_BARE : public MC_ZJETS {
MC_ZJETS_EL_BARE() : MC_ZJETS("MC_ZJETS_EL_BARE") {
_dR = 0;
_lepton = PID::ELECTRON;
}
};
struct MC_ZJETS_MU : public MC_ZJETS {
MC_ZJETS_MU() : MC_ZJETS("MC_ZJETS_MU") {
_dR = 0.2;
_lepton = PID::MUON;
}
};
struct MC_ZJETS_MU_BARE : public MC_ZJETS {
MC_ZJETS_MU_BARE() : MC_ZJETS("MC_ZJETS_MU_BARE") {
_dR = 0;
_lepton = PID::MUON;
}
};
// The hooks for the plugin system
DECLARE_RIVET_PLUGIN(MC_ZJETS);
DECLARE_RIVET_PLUGIN(MC_ZJETS_EL);
DECLARE_RIVET_PLUGIN(MC_ZJETS_EL_BARE);
DECLARE_RIVET_PLUGIN(MC_ZJETS_MU);
DECLARE_RIVET_PLUGIN(MC_ZJETS_MU_BARE);
}
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