1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/UnstableParticles.hh"
 4#include "Rivet/Projections/Beam.hh"
 5
 6namespace Rivet {
 7
 8
 9  /// @brief Add a short analysis description here
10  class TASSO_1980_I153341 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(TASSO_1980_I153341);
15
16
17    /// @name Analysis methods
18    /// @{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22
23      declare(Beam(), "Beams");
24      declare(UnstableParticles(), "UFS");
25
26      // Book histograms
27      book(_h_p , 2, 1, 1);
28      book(_h_x , 4, 1, 1);
29
30    }
31
32
33    /// Perform the per-event analysis
34    void analyze(const Event& event) {
35
36      // Get beams and average beam momentum
37      const ParticlePair& beams = apply<Beam>(event, "Beams").beams();
38      const double meanBeamMom = ( beams.first.p3().mod() +
39                                   beams.second.p3().mod() ) / 2.0;
40      MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
41
42      for (const Particle& p : apply<UnstableParticles>(event, "UFS").particles(Cuts::pid==PID::K0S or Cuts::pid==PID::K0L)) {
43	double xE = p.E()/meanBeamMom;
44	double modp = p.p3().mod();
45	double beta = modp/p.E();
46	_h_p->fill(modp);
47	_h_x->fill(xE,1./beta);
48      }
49    }
50
51
52    /// Normalise histograms etc., after the run
53    void finalize() {
54      scale(_h_p, crossSection()/nanobarn/sumOfWeights());
55      scale(_h_x, sqr(sqrtS())*crossSection()/microbarn/sumOfWeights());
56    }
57
58    /// @}
59
60
61    /// @name Histograms
62    /// @{
63    Histo1DPtr _h_x, _h_p;
64    /// @}
65
66
67  };
68
69
70  RIVET_DECLARE_PLUGIN(TASSO_1980_I153341);
71
72
73}