1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/ChargedFinalState.hh"
 4#include "Rivet/Projections/UnstableParticles.hh"
 5
 6namespace Rivet {
 7
 8
 9  /// @brief B* production
10  class L3_1995_I381046 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(L3_1995_I381046);
15
16
17    /// @name Analysis methods
18    //@{
19
20    /// Book histograms and initialise projections before the run
21    void init() {
22
23      // // Initialise and register projections
24      declare(ChargedFinalState(), "FS");
25      declare(UnstableParticles(), "UFS");
26
27      // Book histograms
28      book(_c_bStar, "/TMP/cbStar ");
29      book(_c_B    , "/TMP/cB     ");
30
31    }
32
33
34    /// Perform the per-event analysis
35    void analyze(const Event& event) {
36      // First, veto on leptonic events by requiring at least 4 charged FS particles
37      const FinalState& fs = apply<FinalState>(event, "FS");
38      const size_t numParticles = fs.particles().size();
39
40      // Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
41      if (numParticles < 2) {
42        MSG_DEBUG("Failed leptonic event cut");
43        vetoEvent;
44      }
45      MSG_DEBUG("Passed leptonic event cut");
46
47      for(const Particle& p : apply<UnstableParticles>(event, "UFS").particles(Cuts::abspid==513 or Cuts::abspid==523 or
48									       Cuts::abspid==511 or Cuts::abspid==521)) {
49	// count number of Bs not from mixing or B*
50	if(p.abspid()==511 || p.abspid()==521) {
51	  if(p.parents()[0].abspid()==p.abspid()) continue;
52	  if(p.parents()[0].abspid()==513 || p.parents()[0].abspid()==523) continue;
53	  _c_B->fill(); 
54	}
55	// B*
56	else {
57	  _c_bStar->fill();
58	}
59      }
60
61    }
62
63
64    /// Normalise histograms etc., after the run
65    void finalize() {
66      // no of B*/B+B*
67      Scatter2DPtr h1;
68      book(h1,1,1,1);
69      Counter ctemp = *_c_bStar+*_c_B;
70      double val = _c_bStar->val()/ctemp.val();
71      double err = val*sqrt(sqr(_c_bStar->err()/_c_bStar->val())+sqr(ctemp.err()/ctemp.val()));
72      h1->addPoint(91.2,val,make_pair(0.5,0.5),make_pair(err,err) );
73    }
74
75    //@}
76
77
78    /// @name Histograms
79    //@{
80    CounterPtr _c_bStar,_c_B;
81    //@}
82
83
84  };
85
86
87  // The hook for the plugin system
88  RIVET_DECLARE_PLUGIN(L3_1995_I381046);
89
90
91}