Rivet analyses referenceBABAR_2012_I1086537Mass distributions in $B^0\to K^+K^-K^0_S$, $B^+\to K^+K^-K^+$ and $B^+\to K^0_SK^0_SK^+$Experiment: BABAR (PEP-II) Inspire ID: 1086537 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Mass distributions in $B^0\to K^+K^-K^0_S$, $B^+\to K^+K^-K^+$ and $B^+\to K^0_SK^0_SK^+$. The data were read from the plots in the paper. Source code: BABAR_2012_I1086537.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 K decays
10 class BABAR_2012_I1086537 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2012_I1086537);
15
16
17 /// @name Analysis methods
18 /// @{
19
20 /// Book histograms and initialise projections before the run
21 void init() {
22 // projections
23 UnstableParticles ufs = UnstableParticles(Cuts::abspid==511 or Cuts::abspid==521);
24 declare(ufs, "UFS");
25 DecayedParticles BB(ufs);
26 BB.addStable(310);
27 declare(BB, "BB");
28 // histograms
29 for(unsigned int ix=0;ix<3;++ix)
30 for(unsigned int iy=0;iy<3;++iy)
31 book(_h_aver[ix][iy],1+2*ix,1,1+iy);
32 for(unsigned int ix=0;ix<2;++ix) {
33 book(_h_charge2[ix],4,1,1+ix);
34 for(unsigned int iy=0;iy<2;++iy)
35 book(_h_charge1[ix][iy],2,1+iy,1+ix);
36 }
37 }
38
39
40 /// Perform the per-event analysis
41 void analyze(const Event& event) {
42 static const map<PdgId,unsigned int> & mode1 = { { 321,2},{-321,1}};
43 static const map<PdgId,unsigned int> & mode1CC = { { 321,1},{-321,2}};
44 static const map<PdgId,unsigned int> & mode2 = { { 310,2},{ 321,1}};
45 static const map<PdgId,unsigned int> & mode2CC = { { 310,2},{-321,1}};
46 static const map<PdgId,unsigned int> & mode3 = { { 310,1},{ 321,1} ,{-321,1}};
47 DecayedParticles BB = apply<DecayedParticles>(event, "BB");
48 for(unsigned int ix=0;ix<BB.decaying().size();++ix) {
49 int sign = 1, imode = 0;
50 if (BB.decaying()[ix].pid()>0 && BB.modeMatches(ix,3,mode1)) {
51 imode=0;
52 sign=1;
53 }
54 else if (BB.decaying()[ix].pid()<0 && BB.modeMatches(ix,3,mode1CC)) {
55 imode=0;
56 sign=-1;
57 }
58 else if (BB.decaying()[ix].pid()>0 && BB.modeMatches(ix,3,mode2)) {
59 imode=1;
60 sign=1;
61 }
62 else if (BB.decaying()[ix].pid()<0 && BB.modeMatches(ix,3,mode2CC)) {
63 imode=1;
64 sign=-1;
65 }
66 else if (BB.modeMatches(ix,3,mode3)) {
67 imode=2;
68 if(BB.decaying()[ix].pid()<0) sign=-1;
69 }
70 else
71 continue;
72 // B+ -> K+ K+ K-
73 if(imode==0) {
74 const Particles & Kp = BB.decayProducts()[ix].at( sign*321);
75 const Particle & Km = BB.decayProducts()[ix].at(-sign*321)[0];
76 double mKpKm[2];
77 for(unsigned int ix=0;ix<2;++ix)
78 mKpKm[ix] = (Kp[ix].momentum()+Km.momentum()).mass();
79 if(mKpKm[0]>mKpKm[1]) swap(mKpKm[0],mKpKm[1]);
80 _h_aver[0][0]->fill(mKpKm[0]);
81 _h_aver[0][1]->fill(mKpKm[1]);
82 _h_aver[0][2]->fill((Kp[0].momentum()+Kp[1].momentum()).mass());
83 if(BB.decaying()[ix].pid()>0) {
84 for(unsigned int ix=0;ix<2;++ix) _h_charge1[0][ix]->fill(mKpKm[0]);
85 }
86 else {
87 for(unsigned int ix=0;ix<2;++ix) _h_charge1[1][ix]->fill(mKpKm[0]);
88 }
89 }
90 // B+ -> KS0 KS0 K+
91 else if(imode==1) {
92 const Particles & K0 = BB.decayProducts()[ix].at( 310);
93 const Particle & Kp = BB.decayProducts()[ix].at( sign*321)[0];
94 double mK0K0 = (K0[0].momentum()+K0[1].momentum()).mass();
95 _h_aver[1][0]->fill(mK0K0);
96 double mKpK0[2];
97 for(unsigned int ix=0;ix<2;++ix)
98 mKpK0[ix] = (K0[ix].momentum()+Kp.momentum()).mass();
99 if(mKpK0[0]>mKpK0[1]) swap(mKpK0[0],mKpK0[1]);
100 _h_aver[1][1]->fill(mKpK0[1]);
101 _h_aver[1][2]->fill(mKpK0[0]);
102 if(BB.decaying()[ix].pid()>0) {
103 _h_charge2[0]->fill(mK0K0);
104 }
105 else {
106 _h_charge2[1]->fill(mK0K0);
107 }
108 }
109 // B0 -> KS0 K+ K-
110 else if(imode==2) {
111 const Particle & K0 = BB.decayProducts()[ix].at( 310)[0];
112 const Particle & Kp = BB.decayProducts()[ix].at( sign*321)[0];
113 const Particle & Km = BB.decayProducts()[ix].at(-sign*321)[0];
114 _h_aver[2][0]->fill((Kp.momentum()+Km.momentum()).mass());
115 _h_aver[2][1]->fill((K0.momentum()+Km.momentum()).mass());
116 _h_aver[2][2]->fill((K0.momentum()+Kp.momentum()).mass());
117 }
118 }
119 }
120
121
122 /// Normalise histograms etc., after the run
123 void finalize() {
124 for(unsigned int ix=0;ix<3;++ix)
125 for(unsigned int iy=0;iy<3;++iy)
126 normalize(_h_aver[ix][iy],1.,false);
127 for(unsigned int ix=0;ix<2;++ix) {
128 normalize(_h_charge2[ix],1.,false);
129 for(unsigned int iy=0;iy<2;++iy)
130 normalize(_h_charge1[ix][iy],1.,false);
131 }
132 }
133
134 /// @}
135
136
137 /// @name Histograms
138 /// @{
139 Histo1DPtr _h_aver[3][3];
140 Histo1DPtr _h_charge1[2][2];
141 Histo1DPtr _h_charge2[2];
142 /// @}
143
144
145 };
146
147
148 RIVET_DECLARE_PLUGIN(BABAR_2012_I1086537);
149
150}
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