1// -*- C++ -*-
  2#include "Rivet/Analysis.hh"
  3#include "Rivet/Projections/ZFinder.hh"
  4#include "Rivet/Projections/FastJets.hh"
  5
  6namespace Rivet {
  7
  8
  9  /// @brief D0 differential Z/\f$ \gamma^* \f$ + jet + \f$ X \f$ cross sections
 10  ///
 11  /// @author Gavin Hesketh, Andy Buckley, Frank Siegert
 12  class D0_2008_S7863608 : public Analysis {
 13  public:
 14
 15    RIVET_DEFAULT_ANALYSIS_CTOR(D0_2008_S7863608);
 16
 17
 18    /// @name Analysis methods
 19    /// @{
 20
 21    /// Book histograms
 22    void init() {
 23      /// @todo These clustering arguments look odd: are they ok?
 24      Cut cut = Cuts::abseta < 1.7 && Cuts::pT > 15*GeV;
 25      ZFinder zfinder(FinalState(), cut, PID::MUON, 65*GeV, 115*GeV, 0.2, ZFinder::ClusterPhotons::NONE, ZFinder::AddPhotons::YES);
 26      declare(zfinder, "ZFinder");
 27
 28      FastJets conefinder(zfinder.remainingFinalState(), FastJets::D0ILCONE, 0.5);
 29      declare(conefinder, "ConeFinder");
 30
 31      book(_sum_of_weights_inclusive, "sum_of_weights_inclusive");
 32
 33      book(_h_jet_pT_cross_section ,1, 1, 1);
 34      book(_h_jet_pT_normalised ,1, 1, 2);
 35      book(_h_jet_y_cross_section ,2, 1, 1);
 36      book(_h_jet_y_normalised ,2, 1, 2);
 37      book(_h_Z_pT_cross_section ,3, 1, 1);
 38      book(_h_Z_pT_normalised ,3, 1, 2);
 39      book(_h_Z_y_cross_section ,4, 1, 1);
 40      book(_h_Z_y_normalised ,4, 1, 2);
 41      book(_h_total_cross_section ,5, 1, 1);
 42    }
 43
 44
 45    // Do the analysis
 46    void analyze(const Event& e) {
 47      const ZFinder& zfinder = apply<ZFinder>(e, "ZFinder");
 48      if (zfinder.bosons().size()==1) {
 49        _sum_of_weights_inclusive->fill();
 50        const JetAlg& jetpro = apply<JetAlg>(e, "ConeFinder");
 51        const Jets& jets = jetpro.jetsByPt(20*GeV);
 52        Jets jets_cut;
 53        for (const Jet& j : jets) {
 54          if (j.abseta() < 2.8) {
 55            jets_cut.push_back(j);
 56          }
 57        }
 58
 59        // Return if there are no jets:
 60        if(jets_cut.size()<1) {
 61          MSG_DEBUG("Skipping event " << numEvents() << " because no jets pass cuts ");
 62          vetoEvent;
 63        }
 64
 65        const FourMomentum Zmom = zfinder.bosons()[0].momentum();
 66
 67        // In jet pT
 68        _h_jet_pT_cross_section->fill( jets_cut[0].pT());
 69        _h_jet_pT_normalised->fill( jets_cut[0].pT());
 70        _h_jet_y_cross_section->fill( fabs(jets_cut[0].rapidity()));
 71        _h_jet_y_normalised->fill( fabs(jets_cut[0].rapidity()));
 72
 73        // In Z pT
 74        _h_Z_pT_cross_section->fill(Zmom.pT());
 75        _h_Z_pT_normalised->fill(Zmom.pT());
 76        _h_Z_y_cross_section->fill(Zmom.absrap());
 77        _h_Z_y_normalised->fill(Zmom.absrap());
 78
 79        _h_total_cross_section->fill(1960);
 80      }
 81    }
 82
 83
 84    /// Finalize
 85    void finalize() {
 86      const double invlumi = crossSection()/sumOfWeights();
 87      scale(_h_total_cross_section, invlumi);
 88      scale(_h_jet_pT_cross_section, invlumi);
 89      scale(_h_jet_y_cross_section, invlumi);
 90      scale(_h_Z_pT_cross_section, invlumi);
 91      scale(_h_Z_y_cross_section, invlumi);
 92
 93      double factor=1/dbl(*_sum_of_weights_inclusive);
 94      if (_sum_of_weights_inclusive->val() == 0) factor = 0;
 95      scale(_h_jet_pT_normalised, factor);
 96      scale(_h_jet_y_normalised, factor);
 97      scale(_h_Z_pT_normalised, factor);
 98      scale(_h_Z_y_normalised, factor);
 99    }
100
101    /// @}
102
103
104  private:
105
106    /// @name Histograms
107    /// @{
108    Histo1DPtr _h_jet_pT_cross_section;
109    Histo1DPtr _h_jet_y_cross_section;
110    Histo1DPtr _h_Z_pT_cross_section;
111    Histo1DPtr _h_Z_y_cross_section;
112    Histo1DPtr _h_total_cross_section;
113    Histo1DPtr _h_jet_pT_normalised;
114    Histo1DPtr _h_jet_y_normalised;
115    Histo1DPtr _h_Z_pT_normalised;
116    Histo1DPtr _h_Z_y_normalised;
117    /// @}
118
119    CounterPtr _sum_of_weights_inclusive;
120
121  };
122
123
124
125  RIVET_DECLARE_ALIASED_PLUGIN(D0_2008_S7863608, D0_2008_I792812);
126
127}