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 DASP_1982_I178613 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(DASP_1982_I178613);
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
24      // Book histograms
25      book(_c_hadrons, "/TMP/sigma_hadrons");
26      book(_c_muons, "/TMP/sigma_muons");
27    }
28
29
30    /// Perform the per-event analysis
31    void analyze(const Event& event) {
32      const FinalState& fs = apply<FinalState>(event, "FS");
33
34      map<long,int> nCount;
35      int ntotal(0);
36      for (const Particle& p : fs.particles()) {
37	nCount[p.pid()] += 1;
38	++ntotal;
39      }
40      // mu+mu- + photons
41      if(nCount[-13]==1 and nCount[13]==1 &&
42	 ntotal==2+nCount[22])
43	_c_muons->fill();
44      // everything else
45      else
46	_c_hadrons->fill();
47    }
48
49
50    /// Normalise histograms etc., after the run
51    void finalize() {
52      Estimate0D R = *_c_hadrons/ *_c_muons;
53      double fact = crossSection()/ sumOfWeights() /picobarn;
54      double sig_h = _c_hadrons->val()*fact;
55      double err_h = _c_hadrons->err()*fact;
56      double sig_m = _c_muons  ->val()*fact;
57      double err_m = _c_muons  ->err()*fact;
58      Estimate1DPtr hadrons, muons, mult;
59      book(hadrons, "sigma_hadrons");
60      book(muons, "sigma_muons"  );
61      book(mult, 2, 1, 1);
62      for (auto& b : mult->bins()) {
63        if (inRange(sqrtS()/GeV, b.xMin(), b.xMax())) {
64          b.set(R.val(), R.errPos());
65          hadrons->bin(b.index()).set(sig_h, err_h);
66          muons  ->bin(b.index()).set(sig_m, err_m);
67        }
68      }
69    }
70
71    /// @}
72
73
74    /// @name Histograms
75    /// @{
76    CounterPtr _c_hadrons, _c_muons;
77    /// @}
78
79
80  };
81
82
83  RIVET_DECLARE_PLUGIN(DASP_1982_I178613);
84
85
86}