Rivet analyses referenceBELLE_2019_I1729723$\bar{B}^0\to K^0_SK^\mp\pi^\pm$Experiment: BELLE (KEKB) Inspire ID: 1729723 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the mass distributions in the decays $\bar{B}^0\to K^0_SK^\mp\pi^\pm$. The data were read from the plots in the paper, but is corrected for detector efficiency. Source code: BELLE_2019_I1729723.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 B0 -> KS0 K-+ pi+-
10 class BELLE_2019_I1729723 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2019_I1729723);
15
16
17 /// @name Analysis methods
18 /// @{
19
20 /// Book histograms and initialise projections before the run
21 void init() {
22 UnstableParticles ufs = UnstableParticles(Cuts::abspid==511);
23 declare(ufs, "UFS");
24 DecayedParticles B0(ufs);
25 B0.addStable(PID::PI0);
26 B0.addStable(PID::K0S);
27 B0.addStable(PID::ETA);
28 B0.addStable(PID::ETAPRIME);
29 declare(B0, "B0");
30 for(unsigned int ix=0;ix<3;++ix) {
31 for(unsigned int iy=0;iy<2;++iy) {
32 book(_h[ix][iy],1+ix,1,1+iy);
33 }
34 }
35 book(_n,"TMP/nB0");
36 }
37
38
39 /// Perform the per-event analysis
40 void analyze(const Event& event) {
41 static const map<PdgId,unsigned int> & mode = { { 310,1}, {-321,1}, { 211,1} };
42 static const map<PdgId,unsigned int> & modeCC = { { 310,1}, { 321,1}, {-211,1} };
43 DecayedParticles B0 = apply<DecayedParticles>(event, "B0");
44 // loop over particles
45 for(unsigned int ix=0;ix<B0.decaying().size();++ix) {
46 _n->fill();
47 unsigned int iloc(0);
48 int sign=1;
49 if(B0.modeMatches(ix,3,mode)) {
50 sign=1;
51 iloc = B0.decaying()[ix].pid()>0 ? 1 : 0;
52 }
53 else if(B0.modeMatches(ix,3,modeCC)) {
54 sign=-1;
55 iloc = B0.decaying()[ix].pid()>0 ? 0 : 1;
56 }
57 else
58 continue;
59 const Particle & pip = B0.decayProducts()[ix].at( sign*211)[0];
60 const Particle & Km = B0.decayProducts()[ix].at(-sign*321)[0];
61 const Particle & K0 = B0.decayProducts()[ix].at( 310)[0];
62 _h[0][iloc]->fill((Km.momentum()+pip.momentum()).mass());
63 _h[1][iloc]->fill((K0.momentum()+pip.momentum()).mass());
64 _h[2][iloc]->fill((Km.momentum()+K0 .momentum()).mass());
65 }
66 }
67
68
69 /// Normalise histograms etc., after the run
70 void finalize() {
71 for(unsigned int ix=0;ix<3;++ix) {
72 for(unsigned int iy=0;iy<2;++iy) {
73 scale(_h[ix][iy], 1e7/ *_n);
74 }
75 }
76 }
77
78 /// @}
79
80
81 /// @name Histograms
82 /// @{
83 Histo1DPtr _h[3][2];
84 CounterPtr _n;
85 /// @}
86
87
88 };
89
90
91 RIVET_DECLARE_PLUGIN(BELLE_2019_I1729723);
92
93}
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