Rivet analyses referenceBELLE_2017_I1598461Mass distributions in $B^+\to K^+K^-\pi^+$Experiment: BELLE (KEKB) Inspire ID: 1598461 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Differential branching ratio and CP-asymmetry in the mass of the kaon pair for the decay $B^+\to K^+K^-\pi^+$. Source code: BELLE_2017_I1598461.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 B+ -> K+ K- pi+
10 class BELLE_2017_I1598461 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2017_I1598461);
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==521);
24 declare(ufs, "UFS");
25 DecayedParticles BP(ufs);
26 declare(BP, "BP");
27 // book histograms
28 for(unsigned int ix=0;ix<3;++ix) {
29 if(ix==0) book(_h[ix],1,1,1);
30 else book(_h[ix],"TMP/h_"+toString(ix+1),refData(1,1,1));
31 book(_c[ix],"TMP/c_"+toString(ix+1));
32 }
33 }
34
35
36 /// Perform the per-event analysis
37 void analyze(const Event& event) {
38 static const map<PdgId,unsigned int> & mode = { { 321,1},{-321,1}, { 211,1}};
39 static const map<PdgId,unsigned int> & modeCC = { { 321,1},{ 321,1}, {-211,1}};
40 DecayedParticles BP = apply<DecayedParticles>(event, "BP");
41 // loop over particles
42 for(unsigned int ix=0;ix<BP.decaying().size();++ix) {
43 _c[0]->fill();
44 if(BP.decaying()[ix].pid()>0) _c[1]->fill();
45 else _c[2]->fill();
46 int sign = 1;
47 if (BP.decaying()[ix].pid()>0 && BP.modeMatches(ix,3,mode)) {
48 sign=1;
49 }
50 else if (BP.decaying()[ix].pid()<0 && BP.modeMatches(ix,3,modeCC)) {
51 sign=-1;
52 }
53 else
54 continue;
55 const Particle & Kp = BP.decayProducts()[ix].at( 321)[0];
56 const Particle & Km = BP.decayProducts()[ix].at(-321)[0];
57 double mKK = (Kp.momentum()+Km.momentum()).mass();
58 _h[0]->fill(mKK);
59 if(sign==1) _h[1]->fill(mKK);
60 else _h[2]->fill(mKK);
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],1e7/ *_c[ix]);
69 Estimate1DPtr as;
70 book(as,1,1,2);
71 asymm(_h[2],_h[1],as);
72 }
73
74 /// @}
75
76
77 /// @name Histograms
78 /// @{
79 Histo1DPtr _h[3];
80 CounterPtr _c[3];
81 /// @}
82
83
84 };
85
86
87 RIVET_DECLARE_PLUGIN(BELLE_2017_I1598461);
88
89}
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