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

// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Tools/BinnedHistogram.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"

namespace Rivet {


  /// @brief CDF dijet angular distributions
  class CDF_1996_S3418421 : public Analysis {
  public:

    RIVET_DEFAULT_ANALYSIS_CTOR(CDF_1996_S3418421);


    /// @name Analysis methods
    //@{

    /// Book histograms and initialise projections before the run
    void init() {
      FinalState fs(Cuts::abseta < 4.2);
      declare(FastJets(fs, FastJets::CDFJETCLU, 0.7), "Jets");

      {Histo1DPtr tmp; _h_chi.add(241.0, 300.0, book(tmp, 1, 1, 1));}
      {Histo1DPtr tmp; _h_chi.add(300.0, 400.0, book(tmp, 1, 1, 2));}
      {Histo1DPtr tmp; _h_chi.add(400.0, 517.0, book(tmp, 1, 1, 3));}
      {Histo1DPtr tmp; _h_chi.add(517.0, 625.0, book(tmp, 1, 1, 4));}
      {Histo1DPtr tmp; _h_chi.add(625.0,1800.0, book(tmp, 1, 1, 5));}
      book(_h_ratio,  2, 1, 1);
      book(_htmp_chi_above_25 ,"TMP/chiabove25", refData(2, 1, 1));
      book(_htmp_chi_below_25 ,"TMP/chibelow25", refData(2, 1, 1));
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      const double weight = 1.0;

      Jets jets = apply<FastJets>(event, "Jets").jetsByPt(50.0*GeV);
      if (jets.size() < 2) vetoEvent;

      const FourMomentum jet1 = jets[0].momentum();
      const FourMomentum jet2 = jets[1].momentum();
      const double eta1 = jet1.eta();
      const double eta2 = jet2.eta();
      const double chi = exp(fabs(eta1 - eta2));
      if (fabs(eta2) > 2.0 || fabs(eta1) > 2.0 || chi > 5.0) vetoEvent;

      double m = FourMomentum(jet1 + jet2).mass();
      _h_chi.fill(m, chi, weight);

      // Fill ratio numerator or denominator depending on chi value
      ((chi > 2.5) ? _htmp_chi_above_25 : _htmp_chi_below_25)->fill(m/GeV, weight);
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      for (Histo1DPtr hist : _h_chi.histos()) {
        normalize(hist);
      }
      divide(_htmp_chi_below_25, _htmp_chi_above_25, _h_ratio);
    }

    //@}


  private:

    /// @name Histograms
    //@{
    BinnedHistogram _h_chi;
    Histo1DPtr _htmp_chi_above_25, _htmp_chi_below_25;
    Scatter2DPtr _h_ratio;
    //@}

  };



  RIVET_DECLARE_ALIASED_PLUGIN(CDF_1996_S3418421, CDF_1996_I423414);

}