1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4#include "Rivet/Projections/ChargedFinalState.hh"
 5
 6namespace Rivet {
 7
 8
 9  /// Generic analysis looking att pp pseudorepidity distributions at
10  /// two collision energies. It usess the possibility to read in a
11  /// pre-exixsting yoda file, and if histograms for both energies are
12  /// filled when finalize() is called, a ratio plot is produced.
13  class MC_REENTRANT : public Analysis {
14  public:
15
16    /// Constructor
17    RIVET_DEFAULT_ANALYSIS_CTOR(MC_REENTRANT);
18
19
20    /// @name Analysis methods
21    /// @{
22
23    /// Book histograms and initialise projections before the run
24    void init() {
25
26      // Projections
27      const FinalState fs(Cuts::abseta < 5 && Cuts::pT > 500*MeV);
28      declare(fs, "FS");
29      declare(ChargedFinalState(fs), "CFS");
30
31      // Histograms. Booked for both 900 GeV and 7 TeV and their ratio.
32      book(_histEta70, "Eta70", 50, -5, 5);
33      book(_histEta09, "Eta09", 50, -5, 5);
34      book(_histEtaR , "EtaR",  50, -5, 5);
35
36      if (isCompatibleWithSqrtS(900.))        fill09 = true;
37      else if (isCompatibleWithSqrtS(7000.))  fill70 = true;
38    }
39
40
41    /// Perform the per-event analysis
42    void analyze(const Event& event) {
43      const FinalState& cfs = apply<FinalState>(event, "CFS");
44      for (const Particle& p : cfs.particles()) {
45        if (fill09)       _histEta09->fill(p.eta());
46        else if (fill70)  _histEta70->fill(p.eta());
47      }
48    }
49
50
51    /// Finalize
52    void finalize() {
53      if ( fill70 ) scale(_histEta70, 1.0/sumOfWeights());
54      if ( fill09 ) scale(_histEta09, 1.0/sumOfWeights());
55      if (_histEta70->numEntries() > 0 && _histEta09->numEntries() > 0) {
56        divide(_histEta70, _histEta09, _histEtaR);
57      }
58    }
59
60    /// @}
61
62
63  private:
64
65    /// @name Histograms
66    /// @{
67    Histo1DPtr _histEta09, _histEta70;
68    Estimate1DPtr _histEtaR;
69    /// @}
70
71    bool fill09 = false, fill70 = false;
72
73  };
74
75
76  RIVET_DECLARE_PLUGIN(MC_REENTRANT);
77
78}