Rivet analyses referenceBELLE_2009_I816632$D_s^{(*)-}K^+$ mass distribution in $B^+\to D_s^{(*)-}K^+\pi^+$ decaysExperiment: BELLE (KEKB) Inspire ID: 816632 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the $D_s^{(*)-}K^+$ mass distribution in $B^+\to D_s^{(*)-}K^+\pi^+$ decays. The data were read from the plots in the paper and may not be corrected for efficiency/acceptance, although the backgrounds given wre subtracted. Source code: BELLE_2009_I816632.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+ -> D_s(*) K pi
10 class BELLE_2009_I816632 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2009_I816632);
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 BP.addStable( 431);
27 BP.addStable(-431);
28 BP.addStable( 433);
29 BP.addStable(-433);
30 declare(BP, "BP");
31 // histograms
32 for(unsigned int ix=0;ix<2;++ix) {
33 book(_h_mass[ix],1,1,1+ix);
34 }
35 }
36
37
38 /// Perform the per-event analysis
39 void analyze(const Event& event) {
40 static const map<PdgId,unsigned int> & mode1 = { { -431,1}, { 321,1}, { 211,1}};
41 static const map<PdgId,unsigned int> & mode1CC = { { 431,1}, {-321,1}, {-211,1}};
42 static const map<PdgId,unsigned int> & mode2 = { { -433,1}, { 321,1}, { 211,1}};
43 static const map<PdgId,unsigned int> & mode2CC = { { 433,1}, {-321,1}, {-211,1}};
44 DecayedParticles BP = apply<DecayedParticles>(event, "BP");
45 // loop over particles
46 for(unsigned int ix=0;ix<BP.decaying().size();++ix) {
47 int sign=1, mode=0;
48 if (BP.modeMatches(ix,3,mode1 )) {
49 mode = 0;
50 sign = 1;
51 }
52 else if (BP.modeMatches(ix,3,mode1CC)) {
53 sign =-1;
54 mode = 0;
55 }
56 else if (BP.modeMatches(ix,3,mode2 )) {
57 mode = 1;
58 sign = 1;
59 }
60 else if (BP.modeMatches(ix,3,mode2CC)) {
61 sign =-1;
62 mode = 1;
63 }
64 else continue;
65 const Particle & Ds = BP.decayProducts()[ix].at(-sign*(431+2*mode))[0];
66 const Particle & Kp = BP.decayProducts()[ix].at( sign*321)[0];
67 _h_mass[mode]->fill((Ds.momentum()+Kp.momentum()).mass());
68 }
69 }
70
71
72 /// Normalise histograms etc., after the run
73 void finalize() {
74 for(unsigned int ix=0;ix<2;++ix) {
75 normalize(_h_mass[ix],1.,false);
76 }
77 }
78
79 /// @}
80
81
82 /// @name Histograms
83 /// @{
84 Histo1DPtr _h_mass[2];
85 /// @}
86
87
88 };
89
90
91 RIVET_DECLARE_PLUGIN(BELLE_2009_I816632);
92
93}
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