1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/UnstableParticles.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief eta production at 29 GeV
 9  class MARKII_1988_I261194 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(MARKII_1988_I261194);
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(UnstableParticles(), "UFS");
23      //Histograms
24      book(_h_spect,1,1,1);
25    }
26
27
28    /// Perform the per-event analysis
29    void analyze(const Event& event) {
30      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
31      for (const Particle& p : ufs.particles(Cuts::abspid==221)) {
32	const double xp = 2.*p.E()/sqrtS();
33	const double beta = p.p3().mod() / p.E();
34	_h_spect->fill(xp,1./beta);
35      }
36    }
37
38
39    /// Normalise histograms etc., after the run
40    void finalize() {
41      scale(_h_spect, sqr(sqrtS())*crossSection()/microbarn/sumOfWeights());
42    }
43
44    ///@}
45
46
47    /// @name Histograms
48    ///@{
49    Histo1DPtr _h_spect;
50    ///@}
51
52
53  };
54
55
56  RIVET_DECLARE_PLUGIN(MARKII_1988_I261194);
57
58}