1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/UnstableParticles.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief e+e- > B* X
 9  class CUSB_1991_I325661 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(CUSB_1991_I325661);
14
15
16    /// @name Analysis methods
17    /// @{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21
22      // Initialise and register projections
23      declare(UnstableParticles(), "UFS");
24
25      // Book histograms
26      book(_c_Bstar, 1, 1, 1);
27      for (const string& en : _c_Bstar.binning().edges<0>()) {
28        const size_t idx = en.find("-");
29        if(idx!=std::string::npos) {
30          const double emin = std::stod(en.substr(0,idx));
31          const double emax = std::stod(en.substr(idx+1,string::npos));
32          if(inRange(sqrtS()/GeV, emin, emax)) {
33            _ecms = en;
34            break;
35          }
36        }
37        else {
38          const double end = std::stod(en)*GeV;
39          if (isCompatibleWithSqrtS(end)) {
40            _ecms = en;
41            break;
42          }
43        }
44      }
45      if (_ecms.empty())
46        MSG_ERROR("Beam energy incompatible with analysis.");
47    }
48
49
50    /// Perform the per-event analysis
51    void analyze(const Event& event) {
52      const FinalState& ufs = apply<FinalState>(event, "UFS");
53      unsigned int nBstar(0);
54      // Get Bottom hadrons
55      const Particles bhads = ufs.particles(Cuts::abspid==513 or Cuts::abspid==523);
56      // find the Bstars
57      for (const Particle& p : bhads) {
58        if(abs(p.pid())==513 || abs(p.pid())==523) {
59          if(!p.hasDescendantWith(Cuts::pid == p.pid())) ++nBstar;
60        }
61      }
62      if(nBstar!=0)
63        _c_Bstar->fill(_ecms,nBstar);
64    }
65
66
67    /// Normalise histograms etc., after the run
68    void finalize() {
69      scale(_c_Bstar,crossSection()/ sumOfWeights() /nanobarn);
70    }
71
72    /// @}
73
74
75    /// @name Histograms
76    /// @{
77    BinnedHistoPtr<string> _c_Bstar;
78    string _ecms;
79    /// @}
80
81
82  };
83
84
85  RIVET_DECLARE_PLUGIN(CUSB_1991_I325661);
86
87
88}