Rivet analyses

title: MC_WKTSPLITTINGS

Monte Carlo validation observables for $k_\perp$ splitting scales in $W[\ell \, \nu]$ + jets events

Experiment: ()

Status: VALIDATED

Authors: - Frank Siegert - Christian Gutschow

References: none listed

Beams: * *

Beam energies: ANY

Run details: - $\ell \, \nu$ + jets analysis.

Monte Carlo validation observables for $k_\perp$ splitting scales in $W[\ell \, \nu]$ + jets events 60 GeV $<m_W<$ 100 GeV cut applied.

Source code:MC_WKTSPLITTINGS.cc

```c++ // -- C++ --

include "Rivet/Analyses/MC_KTSPLITTINGS_BASE.hh"

include "Rivet/Projections/FastJets.hh"

include "Rivet/Projections/LeptonFinder.hh"

include "Rivet/Projections/MissingMomentum.hh"

include "Rivet/Projections/PromptFinalState.hh"

include "Rivet/Projections/VetoedFinalState.hh"

namespace Rivet {

/// @brief MC validation analysis for kt splitting scales in W + jets events class MC_WKTSPLITTINGS : public MC_KTSPLITTINGS_BASE { public:

/// Default constructor
MC_WKTSPLITTINGS()
    : MC_KTSPLITTINGS_BASE("MC_WKTSPLITTINGS", 4, "Jets") { }


/// @name Analysis methods
/// @{

/// Book histograms
void init() {

  // Use analysis options
  _dR = (getOption("SCHEME") == "BARE") ? 0.0 : 0.2;
  _lepton = (getOption("LMODE") == "MU") ? PID::MUON : PID::ELECTRON;
  const double ETACUT = getOption<double>("ABSETALMAX", 3.5);
  const double PTCUT = getOption<double>("PTLMIN", 25.);
  const Cut cut = Cuts::abseta < ETACUT && Cuts::pT > PTCUT * GeV;

  // Define projections
  LeptonFinder lf(_dR, cut && Cuts::abspid == _lepton);
  declare(lf, "Leptons");

  declare(MissingMomentum(), "MET");

  VetoedFinalState jetinput;
  jetinput.vetoFinalState(lf);
  const double R = getOption<double>("R", 0.6);
  FastJets fj(jetinput, JetAlg::KT, R);
  declare(fj, "Jets");

  MC_KTSPLITTINGS_BASE::init();
}


/// Do the analysis
void analyze(const Event& event) {

  // MET cut
  const P4& pmiss = apply<MissingMom>(event, "MET").missingMom();
  if (pmiss.pT() < 25 * GeV) vetoEvent;

  // Identify the closest-matching l+MET to m == mW
  const Particles& ls = apply<LeptonFinder>(event, "Leptons").particles();
  const int ifound = closestMassIndex(ls, pmiss, 80.4 * GeV, 60 * GeV, 100 * GeV);
  if (ifound < 0) vetoEvent;

  MC_KTSPLITTINGS_BASE::analyze(event);
}


/// Finalize
void finalize() {
  MC_KTSPLITTINGS_BASE::finalize();
}

/// @}

protected:

/// @name Parameters for specialised e/mu and dressed/bare subclassing
/// @{
double _dR;
PdgId _lepton;
/// @}

};

RIVET_DECLARE_PLUGIN(MC_WKTSPLITTINGS);

} ```