1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/Beam.hh"
 4#include "Rivet/Projections/UnstableParticles.hh"
 5
 6namespace Rivet {
 7
 8
 9  /// @brief Spectrum for D_s1
10  class ARGUS_1989_I282570 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1989_I282570);
15
16
17    /// @name Analysis methods
18    /// @{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22      // projections
23      declare(Beam(), "Beams");
24      declare(UnstableParticles(), "UFS");
25      // book histos
26      book(_h_rate1 ,1,1,1);
27      book(_h_rate2 ,1,1,2);
28      book(_h_x     ,2,1,1);
29    }
30
31    bool isK0(int id) {
32      return id==310 || id==130 || abs(id)==311;
33    }
34
35
36    /// Perform the per-event analysis
37    void analyze(const Event& event) {
38      static const int DsID = 10433;
39      // Get beams and average beam momentum
40      const ParticlePair& beams = apply<Beam>(event, "Beams").beams();
41      const double Emax = ( beams.first.p3().mod() + beams.second.p3().mod() ) / 2.0;
42      const double Pmax = sqrt(sqr(Emax)-sqr(2.535));
43      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
44      for (const Particle& p : ufs.particles(Cuts::abspid==DsID)) {
45        double xp = p.momentum().p3().mod()/Pmax;
46        _h_x->fill(xp);
47        if(p.children().size()!=2) continue;
48        int sign = p.pid()/DsID;
49        if(p.children()[0].pid()==sign*413 &&
50           isK0(p.children()[1].pid())) {
51          _h_rate1->fill(10);
52          _h_rate2->fill(10);
53        }
54        else if (p.children()[1].pid()==sign*413 &&
55           isK0(p.children()[0].pid())) {
56          _h_rate1->fill(10);
57          _h_rate2->fill(10);
58        }
59        else if(p.children()[0].pid()==sign*423 &&
60          p.children()[1].pid()==sign*321) {
61          _h_rate2->fill(10);
62        }
63        else if(p.children()[1].pid()==sign*423 &&
64          p.children()[0].pid()==sign*321) {
65          _h_rate2->fill(10);
66        }
67      }
68    }
69
70
71    /// Normalise histograms etc., after the run
72    void finalize() {
73      normalize(_h_x);
74      scale(_h_rate1,crossSection()/sumOfWeights()/picobarn);
75      scale(_h_rate2,crossSection()/sumOfWeights()/picobarn);
76    }
77
78    /// @}
79
80
81    /// @name Histograms
82    /// @{
83    BinnedHistoPtr<int> _h_rate1,_h_rate2;
84    Histo1DPtr _h_x;
85    /// @}
86
87
88  };
89
90
91  RIVET_DECLARE_PLUGIN(ARGUS_1989_I282570);
92
93}