Rivet Analyses Reference

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152

// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/VetoedFinalState.hh"
#include "Rivet/Projections/IdentifiedFinalState.hh"
#include "Rivet/Projections/DressedLeptons.hh"
#include "Rivet/Projections/FastJets.hh"

namespace Rivet {



  class ATLAS_2013_I1217867 : public Analysis {
  public:

    /// @name Constructors etc.
    //@{

    /// Constructor
    ATLAS_2013_I1217867()
      : Analysis("ATLAS_2013_I1217867")
    {
      m_njet = 4;
      _h_dI.resize(2, std::vector<Histo1DPtr>(m_njet));
      _h_dI_ratio.resize(2, std::vector<Histo1DPtr>(m_njet-1));
    }

    //@}


  public:

    /// @name Analysis methods
    //@{

    /// Book histograms and initialise projections before the run
    void init() {
      // Initialise projections

      FinalState fs(Cuts::abseta < 5.0);

      IdentifiedFinalState bareElectrons(fs);
      bareElectrons.acceptIdPair(PID::ELECTRON);

      Cut cuts = (Cuts::absetaIn(0, 1.37) || Cuts::absetaIn(1.52, 2.47)) && Cuts::pT > 20*GeV;

      DressedLeptons electronClusters(fs, bareElectrons, 0.1, cuts);
      declare(electronClusters, "electronClusters");

      IdentifiedFinalState bareMuons(fs);
      bareMuons.acceptIdPair(PID::MUON);
      Cut mucuts = Cuts::abseta < 2.4 && Cuts::pT > 20*GeV;
      DressedLeptons muonClusters(fs, bareMuons, 0.1, mucuts);
      declare(muonClusters, "muonClusters");

      IdentifiedFinalState neutrinos(Cuts::pT > 25*GeV);
      neutrinos.acceptNeutrinos();
      declare(neutrinos, "neutrinos");

      VetoedFinalState jetFS(fs);
      jetFS.addVetoOnThisFinalState(electronClusters);
      jetFS.addVetoOnThisFinalState(muonClusters);
      jetFS.addVetoOnThisFinalState(neutrinos);
      FastJets jetpro(jetFS, FastJets::KT, 0.6, JetAlg::Muons::ALL, JetAlg::Invisibles::DECAY);
      declare(jetpro, "jets");

      // Book histograms
      for (size_t flav = 0; flav < 2; ++flav) {
        for (size_t i = 0; i < m_njet; ++i)   book(_h_dI[flav][i],         i+1, 1, flav+1);
        for (size_t i = 0; i < m_njet-1; ++i) book(_h_dI_ratio[flav][i], 4+i+1, 1, flav+1);
      }
    }


    /// Perform the per-event analysis
    void analyze(const Event& e) {
      const DressedLeptons& electronClusters = apply<DressedLeptons>(e, "electronClusters");
      const DressedLeptons& muonClusters = apply<DressedLeptons>(e, "muonClusters");
      int ne = electronClusters.dressedLeptons().size();
      int nmu = muonClusters.dressedLeptons().size();

      FourMomentum lepton;
      size_t flav = 2;
      if (ne==1) {
        lepton=electronClusters.dressedLeptons()[0].momentum();
        flav = 0;
        if (nmu > 0) vetoEvent;
      }
      else if (nmu == 1) {
        lepton=muonClusters.dressedLeptons()[0].momentum();
        flav = 1;
        if (ne > 0) vetoEvent;
      }
      else {
        vetoEvent;
      }

      const Particles& neutrinos = apply<FinalState>(e, "neutrinos").particlesByPt();
      if (neutrinos.size() < 1) vetoEvent;
      FourMomentum neutrino = neutrinos[0].momentum();

      double mtW=sqrt(2.0*lepton.pT()*neutrino.pT()*(1-cos(lepton.phi()-neutrino.phi())));
      if (mtW<40.0*GeV) vetoEvent;

      const shared_ptr<fastjet::ClusterSequence> seq = apply<FastJets>(e, "jets").clusterSeq();
      if (seq) {
        for (size_t i = 0; i < min(m_njet,(size_t)seq->n_particles()); ++i) {
          double d_ij = sqrt(seq->exclusive_dmerge_max(i));
          _h_dI[flav][i]->fill(d_ij);

          if (i<m_njet-1) {
            if (d_ij>20.0*GeV) {
              double d_ijplus1 = sqrt(seq->exclusive_dmerge_max(i+1));
              _h_dI_ratio[flav][i]->fill(d_ijplus1/d_ij);
            }
          }
        }
      }

    }


    /// Normalise histograms etc., after the run
    void finalize() {
      for (size_t flav = 0; flav < 2; ++flav) {
        for (size_t i = 0; i < m_njet; ++i) {
          normalize(_h_dI[flav][i], 1.0, false);
          if (i < m_njet-1) normalize(_h_dI_ratio[flav][i], 1.0, false);
        }
      }
    }

    //@}


  private:

    /// @name Histograms
    //@{
    vector< vector<Histo1DPtr> > _h_dI;
    vector< vector<Histo1DPtr> > _h_dI_ratio;
    //@}

    size_t m_njet;
  };


  // The hook for the plugin system
  RIVET_DECLARE_PLUGIN(ATLAS_2013_I1217867);


}