1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FinalState.hh"
 4#include "Rivet/Projections/UnstableParticles.hh"
 5
 6namespace Rivet {
 7
 8
 9  /// @brief K+/K0 specta at 29 GeV
10  class MARKII_1985_I207785 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(MARKII_1985_I207785);
15
16
17    /// @name Analysis methods
18    ///@{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22      // Initialise and register projections
23      declare(UnstableParticles(), "UFS");
24      //Histograms
25      book(_h["K0"], 2, 1, 1);
26      book(_h["Kp"], 4, 1, 1);
27    }
28
29
30    /// Perform the per-event analysis
31    void analyze(const Event& event) {
32      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
33      for (const Particle& p : ufs.particles(Cuts::abspid==321 or Cuts::abspid==310 or Cuts::abspid==130)) {
34        const double xp = p.p3().mod();
35        const double beta = p.p3().mod() / p.E();
36        if (p.abspid()==321)  _h["Kp"]->fill(xp,1./beta);
37        else                  _h["K0"]->fill(xp,1./beta);
38      }
39    }
40
41
42    /// Normalise histograms etc., after the run
43    void finalize() {
44      // cross section differential in xp, now plotting p so need to convert
45      scale(_h, 1./sumOfWeights()*sqrtS()/2);
46    }
47
48    ///@}
49
50
51    /// @name Histograms
52    ///@{
53    map<string,Histo1DPtr> _h;
54    ///@}
55
56
57  };
58
59
60  RIVET_DECLARE_PLUGIN(MARKII_1985_I207785);
61
62}