1// -*- C++ -*-
  2#include "Rivet/Analyses/MC_JETS_BASE.hh"
  3#include "Rivet/Projections/PromptFinalState.hh"
  4#include "Rivet/Projections/VetoedFinalState.hh"
  5#include "Rivet/Projections/LeptonFinder.hh"
  6#include "Rivet/Projections/MissingMomentum.hh"
  7#include "Rivet/Projections/FastJets.hh"
  8
  9namespace Rivet {
 10
 11
 12  /// @brief MC validation analysis for W + jets events
 13  class MC_WJETS : public MC_JETS_BASE {
 14  public:
 15
 16    /// Default constructor
 17    MC_WJETS(string name="MC_WJETS")
 18      : MC_JETS_BASE(name, 4, "Jets")
 19    {  }
 20
 21
 22    /// @name Analysis methods
 23    /// @{
 24
 25    /// Book histograms
 26    void init() {
 27
 28      // Use analysis options
 29      _dR = (getOption("SCHEME") == "BARE") ? 0.0 : 0.2;
 30      _lepton = (getOption("LMODE") == "MU") ? PID::MUON : PID::ELECTRON;
 31      const double ETACUT = getOption<double>("ABSETALMAX", 3.5);
 32      const double PTCUT = getOption<double>("PTLMIN", 25.);
 33      const Cut cut = Cuts::abseta < ETACUT && Cuts::pT > PTCUT*GeV;
 34
 35      // Define projections
 36      declare("MET", MissingMomentum());
 37      LeptonFinder lf(_dR, cut && Cuts::abspid == _lepton);
 38      declare(lf, "Leptons");
 39
 40      // Set pT cut, jet alg, and clustering radius from input options
 41      _jetptcut = getOption<double>("PTJMIN", 20.0) * GeV;
 42      const double R = getOption<double>("R", 0.4);
 43      JetAlg clusterAlgo;
 44      const string algoopt = getOption("ALGO", "ANTIKT");
 45      if ( algoopt == "KT" ) {
 46        clusterAlgo = JetAlg::KT;
 47      } else if ( algoopt == "CA" ) {
 48        clusterAlgo = JetAlg::CA;
 49      } else if ( algoopt == "ANTIKT" ) {
 50        clusterAlgo = JetAlg::ANTIKT;
 51      } else {
 52        MSG_WARNING("Unknown jet clustering algorithm option " + algoopt + ". Defaulting to anti-kT");
 53        clusterAlgo = JetAlg::ANTIKT;
 54      }
 55
 56      // Find jets with clustering radius from input option
 57      VetoedFinalState jetinput;
 58      jetinput.addVetoOnThisFinalState(lf);
 59      FastJets fj(jetinput, clusterAlgo, R);
 60      declare(fj, "Jets");
 61
 62      book(_h_W_jet1_deta, "W_jet1_deta", 50, -5.0, 5.0);
 63      book(_h_W_jet1_dR, "W_jet1_dR", 25, 0.5, 7.0);
 64
 65      MC_JETS_BASE::init();
 66    }
 67
 68
 69    /// Do the analysis
 70    void analyze(const Event& event) {
 71
 72      // MET cut
 73      const P4& pmiss = apply<MissingMom>(event, "MET").missingMom();
 74      if (pmiss.pT() < 25*GeV) vetoEvent;
 75
 76      // Identify the closest-matching l+MET to m == mW
 77      const Particles& ls = apply<LeptonFinder>(event, "Leptons").particles();
 78      const int ifound = closestMatchIndex(ls, pmiss, Kin::mass, 80.4*GeV, 60*GeV, 100*GeV);
 79      if (ifound < 0) vetoEvent;
 80      const Particle& l = ls[ifound];
 81      FourMomentum wmom = l.mom() + pmiss;
 82
 83      const Jets& jets = apply<FastJets>(event, "Jets").jetsByPt(Cuts::pT > _jetptcut);
 84      if (jets.size() > 0) {
 85        _h_W_jet1_deta->fill(wmom.eta()-jets[0].eta());
 86        _h_W_jet1_dR->fill(deltaR(wmom, jets[0].momentum()));
 87      }
 88
 89      MC_JETS_BASE::analyze(event);
 90    }
 91
 92
 93    /// Finalize
 94    void finalize() {
 95      scale(_h_W_jet1_deta, crossSection()/picobarn/sumOfWeights());
 96      scale(_h_W_jet1_dR, crossSection()/picobarn/sumOfWeights());
 97      MC_JETS_BASE::finalize();
 98    }
 99
100    /// @}
101
102
103  protected:
104
105    /// @name Parameters for specialised e/mu and dressed/bare subclassing
106    /// @{
107    double _dR;
108    PdgId _lepton;
109    /// @}
110
111
112  private:
113
114    /// @name Histograms
115    /// @{
116    Histo1DPtr _h_W_jet1_deta;
117    Histo1DPtr _h_W_jet1_dR;
118    /// @}
119
120  };
121
122
123  RIVET_DECLARE_PLUGIN(MC_WJETS);
124
125}