Rivet analyses referenceBELLE_2015_I1326905Mass distributions in the decays $B^0\to D^-_sK^0_S\pi^+$ and $B^+\to D^-_sK^+K^+$Experiment: BELLE (KEKB) Inspire ID: 1326905 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Mass distributions in the decays $B^0\to D^-_sK^0_S\pi^+$ and $B^+\to D^-_sK^+K^+$, the data were read from the plots in the paper and although the backgrounds have been subtracted they may be be correct for efficiency. Source code: BELLE_2015_I1326905.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 ->\to Ds- KS0 pi+ and B+ -> Ds- K+ K^+
10 class BELLE_2015_I1326905 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2015_I1326905);
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 or Cuts::abspid==521);
23 declare(ufs, "UFS");
24 DecayedParticles BB(ufs);
25 BB.addStable( 431);
26 BB.addStable(-431);
27 BB.addStable( 310);
28 declare(BB, "BB");
29 //histograms
30 for(unsigned int ix=0;ix<2;++ix) {
31 book(_h[ix],1,1,1+ix);
32 }
33 }
34
35
36 /// Perform the per-event analysis
37 void analyze(const Event& event) {
38 static const map<PdgId,unsigned int> & mode1 = { {-431,1},{ 310,1}, { 211,1}};
39 static const map<PdgId,unsigned int> & mode1CC = { { 431,1},{ 310,1}, {-211,1}};
40 static const map<PdgId,unsigned int> & mode2 = { {-431,1},{ 321,2}};
41 static const map<PdgId,unsigned int> & mode2CC = { { 431,1},{-321,2}};
42 DecayedParticles BB = apply<DecayedParticles>(event, "BB");
43 for(unsigned int ix=0;ix<BB.decaying().size();++ix) {
44 int sign = 1, imode = 0;
45 if (BB.decaying()[ix].pid()>0 && BB.modeMatches(ix,3,mode1)) {
46 imode=0;
47 sign=1;
48 }
49 else if (BB.decaying()[ix].pid()<0 && BB.modeMatches(ix,3,mode1CC)) {
50 imode=0;
51 sign=-1;
52 }
53 else if (BB.decaying()[ix].pid()>0 && BB.modeMatches(ix,3,mode2)) {
54 imode=1;
55 sign=1;
56 }
57 else if (BB.decaying()[ix].pid()<0 && BB.modeMatches(ix,3,mode2CC)) {
58 imode=1;
59 sign=-1;
60 }
61 else
62 continue;
63 const Particle & Ds = BB.decayProducts()[ix].at(-sign*431)[0];
64 FourMomentum pK;
65 if(imode==0) {
66 pK = BB.decayProducts()[ix].at(310)[0].momentum();
67 }
68 else {
69 const Particles & Kp = BB.decayProducts()[ix].at(sign*321);
70 pK = Kp[0].momentum().p3().mod()>Kp[1].momentum().p3().mod() ?
71 Kp[1].momentum() : Kp[0].momentum();
72 }
73 _h[imode]->fill((Ds.momentum()+pK).mass());
74 }
75 }
76
77
78 /// Normalise histograms etc., after the run
79 void finalize() {
80 for(unsigned int ix=0;ix<2;++ix) {
81 normalize(_h[ix], 1., false);
82 }
83 }
84
85 /// @}
86
87
88 /// @name Histograms
89 /// @{
90 Histo1DPtr _h[2];
91 /// @}
92
93
94 };
95
96
97 RIVET_DECLARE_PLUGIN(BELLE_2015_I1326905);
98
99}
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