1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief Add a short analysis description here
 9  class BABAR_2006_I700020 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2006_I700020);
14
15
16    /// @name Analysis methods
17    /// @{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21
22      // Initialise and register projections
23      declare(FinalState(), "FS");
24
25      // Book histograms
26      book(_nproton, "TMP/proton");
27    }
28
29
30    /// Perform the per-event analysis
31    void analyze(const Event& event) {
32      const FinalState& fs = apply<FinalState>(event, "FS");
33      if(fs.particles().size()!=2) vetoEvent;
34      for (const Particle& p : fs.particles()) {
35	if(abs(p.pid())!=PID::PROTON) vetoEvent;
36      }
37      _nproton->fill();
38    }
39
40
41    /// Normalise histograms etc., after the run
42    void finalize() {
43
44      double sigma = _nproton->val();
45      double error = _nproton->err();
46      sigma *= crossSection()/ sumOfWeights() /picobarn;
47      error *= crossSection()/ sumOfWeights() /picobarn;
48      for(unsigned int ix=1;ix<3;++ix) {
49        Estimate1DPtr mult;
50        book(mult, ix, 1, 1);
51        for (auto& b : mult->bins()) {
52          if (inRange(sqrtS()/GeV, b.xMin(), b.xMax())) {
53            b.set(sigma, error);
54          }
55        }
56      }
57    }
58
59    /// @}
60
61
62    /// @name Histograms
63    /// @{
64    CounterPtr _nproton;
65    /// @}
66
67
68  };
69
70
71  RIVET_DECLARE_PLUGIN(BABAR_2006_I700020);
72
73
74}