1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/UnstableParticles.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief f_2, f_0 and K_2 spectra at 29 GeV
 9  class HRS_1986_I18688 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(HRS_1986_I18688);
14
15
16    /// @name Analysis methods
17    ///@{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21      declare(UnstableParticles(), "UFS");
22      book(_h_f2,1,1,1);
23      book(_h_f0,1,1,2);
24      book(_h_K2,1,1,3);
25    }
26
27
28    /// Perform the per-event analysis
29    void analyze(const Event& event) {
30      UnstableParticles ufs = apply<UnstableParticles>(event,"UFS");
31      for(const Particle & p : ufs.particles(Cuts::abspid==9010221 ||
32					     Cuts::abspid==225 ||
33					     Cuts::abspid==315)) {
34      	Vector3 mom3 = p.p3();
35        const double energy = p.E();
36      	double modp = mom3.mod();
37      	double beta = modp/energy;
38      	double xE = 2.*modp/sqrtS();
39	if(p.pid()==225) 
40	  _h_f2->fill(xE,1./beta);
41	else if(p.pid()==315) 
42	  _h_K2->fill(xE,1./beta);
43	else
44	  _h_f0->fill(xE,1./beta);
45      }
46    }
47
48
49    /// Normalise histograms etc., after the run
50    void finalize() {
51      scale( _h_f0, sqr(sqrtS())*crossSection()/nanobarn/sumOfWeights());
52      scale( _h_f2, sqr(sqrtS())*crossSection()/nanobarn/sumOfWeights());
53      scale( _h_K2, sqr(sqrtS())*crossSection()/nanobarn/sumOfWeights());
54    }
55
56    ///@}
57
58
59    /// @name Histograms
60    ///@{
61    Histo1DPtr _h_f0,_h_f2,_h_K2;
62    ///@}
63
64
65  };
66
67
68  RIVET_DECLARE_PLUGIN(HRS_1986_I18688);
69
70}