Rivet analyses referenceBABAR_2011_I924163Mass distributions in $\bar{B}^0\to\Lambda^+_c\bar{\Lambda}^0K^-$Experiment: BABAR (PEP-II) Inspire ID: 924163 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Mass distributions in $\bar{B}^0\to\Lambda^+_c\bar{\Lambda}^0K^-$, data read from plots in papers but is background subtracted. Source code: BABAR_2011_I924163.cc 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 Bbar0 -> Lambda_c+ Lambdabar K-
10 class BABAR_2011_I924163 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2011_I924163);
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==511);
24 declare(ufs, "UFS");
25 DecayedParticles B0(ufs);
26 B0.addStable( 3122);
27 B0.addStable(-3122);
28 B0.addStable( 4122);
29 B0.addStable(-4122);
30 declare(B0, "B0");
31 // histos
32 for(unsigned int ix=0;ix<3;++ix)
33 book(_h[ix],1,1,1+ix);
34 }
35
36
37 /// Perform the per-event analysis
38 void analyze(const Event& event) {
39 static const map<PdgId,unsigned int> & mode = { { 4122,1},{-3122,1}, {-321,1}};
40 static const map<PdgId,unsigned int> & modeCC = { {-4122,1},{ 3122,1}, { 321,1}};
41 DecayedParticles B0 = apply<DecayedParticles>(event, "B0");
42 // loop over particles
43 for(unsigned int ix=0;ix<B0.decaying().size();++ix) {
44 int sign = 1;
45 if (B0.decaying()[ix].pid()<0 && B0.modeMatches(ix,3,mode)) {
46 sign=1;
47 }
48 else if (B0.decaying()[ix].pid()>0 && B0.modeMatches(ix,3,modeCC)) {
49 sign=-1;
50 }
51 else
52 continue;
53 const Particle & LamC = B0.decayProducts()[ix].at( sign*4122)[0];
54 const Particle & Lam = B0.decayProducts()[ix].at(-sign*3122)[0];
55 const Particle & Km = B0.decayProducts()[ix].at(-sign*321 )[0];
56 _h[0]->fill((LamC.momentum()+Lam.momentum()).mass());
57 _h[1]->fill((Lam .momentum()+Km .momentum()).mass());
58 _h[2]->fill((LamC.momentum()+Km .momentum()).mass());
59 }
60 }
61
62
63 /// Normalise histograms etc., after the run
64 void finalize() {
65 for(unsigned int ix=0;ix<3;++ix)
66 normalize(_h[ix],1.,false);
67 }
68
69 /// @}
70
71
72 /// @name Histograms
73 /// @{
74 Histo1DPtr _h[3];
75 /// @}
76
77
78 };
79
80
81 RIVET_DECLARE_PLUGIN(BABAR_2011_I924163);
82
83}
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