1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief e+e- > p pbar
 9  class DM1_1979_I141565 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(DM1_1979_I141565);
14
15
16    /// @name Analysis methods
17    /// @{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21      // Initialise and register projections
22      declare(FinalState(), "FS");
23      book(_nProton,  "/TMP/nProton", refData(1,1,1) );
24    }
25
26
27    /// Perform the per-event analysis
28    void analyze(const Event& event) {
29      const FinalState& fs = apply<FinalState>(event, "FS");
30      // total hadronic and muonic cross sections
31      map<long,int> nCount;
32      int ntotal(0);
33      for (const Particle& p : fs.particles()) {
34	nCount[p.pid()] += 1;
35	++ntotal;
36      }
37      if(ntotal==2 && nCount[2212]==1 && nCount[-2212]==1)
38	_nProton->fill(sqrtS()/GeV);
39    }
40
41
42    /// Normalise histograms etc., after the run
43    void finalize() {
44      scale(_nProton, crossSection()/ sumOfWeights() /nanobarn);
45      Estimate1DPtr mult;
46      book(mult, 1, 1, 1);
47      barchart(_nProton,mult);
48    }
49
50    /// @}
51
52
53    /// @name Histograms
54    /// @{
55    Histo1DPtr _nProton;
56    /// @}
57
58
59  };
60
61
62  RIVET_DECLARE_PLUGIN(DM1_1979_I141565);
63
64
65}