1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4#include "Rivet/Projections/DileptonFinder.hh"
 5
 6namespace Rivet {
 7
 8
 9  /// @brief CDF Z boson rapidity measurement
10  class CDF_2009_I856131 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(CDF_2009_I856131);
15
16
17    /// @name Analysis methods
18    /// @{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22
23      /// Initialise and register projections here
24      // this seems to have been corrected completely for all selection cuts,
25      // i.e. eta cuts and pT cuts on leptons.
26      DileptonFinder zfinder(91.2*GeV, 0.2, Cuts::abspid == PID::ELECTRON, Cuts::massIn(66*GeV, 116*GeV));
27      declare(zfinder, "DileptonFinder");
28
29
30      /// Book histograms here
31      book(_h_xs ,1, 1, 1);
32      book(_h_yZ ,2, 1, 1);
33
34    }
35
36
37    /// Perform the per-event analysis
38    void analyze(const Event& event) {
39      const DileptonFinder& zfinder = apply<DileptonFinder>(event, "DileptonFinder");
40      if (zfinder.bosons().size() == 1) {
41        _h_yZ->fill(fabs(zfinder.bosons()[0].rapidity()));
42        _h_xs->fill(1960);
43      } else {
44        MSG_DEBUG("no unique lepton pair found.");
45      }
46
47    }
48
49
50    /// Normalise histograms etc., after the run
51    void finalize() {
52      scale(_h_xs, crossSection()/picobarn/sumOfWeights());
53      // Data seems to have been normalized for the avg of the two sides
54      // (+ve & -ve rapidity) rather than the sum, hence the 0.5:
55      scale(_h_yZ, 0.5*crossSection()/picobarn/sumOfWeights());
56    }
57
58    /// @}
59
60
61  private:
62
63    /// @name Histograms
64    /// @{
65    Histo1DPtr _h_yZ;
66    Histo1DPtr _h_xs;
67    /// @}
68
69  };
70
71
72
73  RIVET_DECLARE_PLUGIN(CDF_2009_I856131);
74
75}