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Rivet analyses reference
MC_ZJETS
Monte Carlo validation observables for $Z[\ell^+ \, \ell^-]$ + jets production
Experiment: ()
Status: VALIDATED
Authors:
- Frank Siegert
- Christian Gutschow
No references listed
Beams: * *
Beam energies: ANY
Run details:
- $\ell^+ \ell^-$ + jets analysis. Needs mass cut on lepton pair to avoid photon singularity, e.g. a min range of $66 < m_{ll} < 116$ 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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123 | // -*- 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")
{ }
/// @name Analysis methods
//@{
/// Initialize
void init() {
_dR=0.2;
if (getOption("SCHEME") == "BARE") _dR = 0.0;
_lepton=PID::ELECTRON;
if (getOption("LMODE") == "MU") _lepton = PID::MUON;
// set FS cuts from input options
const double etacut = getOption<double>("ABSETALMAX", 3.5);
const double ptcut = getOption<double>("PTLMIN", 25.);
FinalState fs;
Cut cut = Cuts::abseta < etacut && Cuts::pT > ptcut*GeV;
ZFinder zfinder(fs, cut, _lepton, 66.0*GeV, 116.0*GeV, _dR, ZFinder::ClusterPhotons::NODECAY, ZFinder::AddPhotons::YES);
declare(zfinder, "ZFinder");
// set ptcut from input option
const double jetptcut = getOption<double>("PTJMIN", 20.0);
_jetptcut = jetptcut * GeV;
// set clustering radius from input option
const double R = getOption<double>("R", 0.4);
// set clustering algorithm from input option
FastJets::Algo clusterAlgo;
const string algoopt = getOption("ALGO", "ANTIKT");
if ( algoopt == "KT" ) {
clusterAlgo = FastJets::KT;
} else if ( algoopt == "CA" ) {
clusterAlgo = FastJets::CA;
} else if ( algoopt == "ANTIKT" ) {
clusterAlgo = FastJets::ANTIKT;
} else {
MSG_WARNING("Unknown jet clustering algorithm option " + algoopt + ". "
"Defaulting to anti-kT");
clusterAlgo = FastJets::ANTIKT;
}
FastJets jetpro(zfinder.remainingFinalState(), clusterAlgo, R);
declare(jetpro, "Jets");
book(_h_Z_jet1_deta ,"Z_jet1_deta", 50, -5, 5);
book(_h_Z_jet1_dR ,"Z_jet1_dR", 25, 0.5, 7.0);
MC_JetAnalysis::init();
}
/// Do the analysis
void analyze(const Event & e) {
MSG_TRACE("MC_ZJETS: running ZFinder");
const ZFinder& zfinder = apply<ZFinder>(e, "ZFinder");
if (zfinder.bosons().size() != 1) vetoEvent;
const FourMomentum& zmom = zfinder.bosons()[0].momentum();
MSG_TRACE("MC_ZJETS: have exactly one Z boson candidate");
const Jets& jets = apply<FastJets>(e, "Jets").jetsByPt(_jetptcut);
if (jets.size() > 0) {
MSG_TRACE("MC_ZJETS: have at least one valid jet");
_h_Z_jet1_deta->fill(zmom.eta()-jets[0].eta());
_h_Z_jet1_dR->fill(deltaR(zmom, jets[0].momentum()));
}
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;
//@}
};
// The hooks for the plugin system
RIVET_DECLARE_PLUGIN(MC_ZJETS);
}
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