1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/UnstableParticles.hh"
 4#include "Rivet/Projections/DecayedParticles.hh"
 5
 6namespace Rivet {
 7
 8
 9  /// @brief BbarS0 -> Lambda_c+ Lambdabar0 pi-
10  class BELLE_2013_I1230342 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2013_I1230342);
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      UnstableParticles ufs = UnstableParticles(Cuts::abspid==531);
24      declare(ufs, "UFS");
25      DecayedParticles BS0(ufs);
26      BS0.addStable( 3122);
27      BS0.addStable(-3122);
28      BS0.addStable( 4122);
29      BS0.addStable(-4122);
30      declare(BS0, "BS0");
31      // histos
32      book(_c,"TMP/nB");
33      for(unsigned int ix=0;ix<3;++ix)
34	book(_h[ix],1,1,1+ix);
35    }
36
37
38    /// Perform the per-event analysis
39    void analyze(const Event& event) {
40      static const map<PdgId,unsigned int> & mode   = { { 4122,1},{-3122,1}, {-211,1}};
41      static const map<PdgId,unsigned int> & modeCC = { {-4122,1},{ 3122,1}, { 211,1}};
42      DecayedParticles BS0 = apply<DecayedParticles>(event, "BS0");
43      // loop over particles
44      for(unsigned int ix=0;ix<BS0.decaying().size();++ix) {
45	_c->fill();
46      	int sign = 1;
47      	if (BS0.decaying()[ix].pid()<0 && BS0.modeMatches(ix,3,mode)) {
48      	  sign=1;
49      	}
50      	else if  (BS0.decaying()[ix].pid()>0 && BS0.modeMatches(ix,3,modeCC)) {
51      	  sign=-1;
52      	}
53      	else
54      	  continue;
55	const Particle & LamC   = BS0.decayProducts()[ix].at( sign*4122)[0];
56	const Particle & LamBar = BS0.decayProducts()[ix].at(-sign*3122)[0];
57	const Particle & pim    = BS0.decayProducts()[ix].at(-sign*211 )[0];
58	_h[0]->fill((LamC.momentum()+LamBar.momentum()).mass());
59	_h[1]->fill((LamC.momentum()+pim   .momentum()).mass());
60	_h[2]->fill((pim .momentum()+LamBar.momentum()).mass());
61      }
62    }
63
64
65    /// Normalise histograms etc., after the run
66    void finalize() {
67      for(unsigned int ix=0;ix<3;++ix)
68	scale(_h[ix],1e4/ *_c);
69    }
70
71    /// @}
72
73
74    /// @name Histograms
75    /// @{
76    Histo1DPtr _h[3];
77    CounterPtr _c;
78    /// @}
79
80
81  };
82
83
84  RIVET_DECLARE_PLUGIN(BELLE_2013_I1230342);
85
86}