Rivet analyses referenceBABAR_2010_I878120Dalitz plot analysis of $D^+_s\to K^+K^-\pi^+$Experiment: BABAR (PEP-II) Inspire ID: 878120 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the mass distributions in the decay $D^+_s\to K^+K^-\pi^+$ by BaBar. The data were read from the plots in the paper and therefore for some points the error bars are the size of the point. It is also not clear that any resolution effects have been unfolded. Source code: BABAR_2010_I878120.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/DecayedParticles.hh"
4#include "Rivet/Projections/UnstableParticles.hh"
5
6namespace Rivet {
7
8
9 /// @brief D_s -> K+K-pi+
10 class BABAR_2010_I878120 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2010_I878120);
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==431);
24 declare(ufs, "UFS");
25 DecayedParticles DS(ufs);
26 DS.addStable(PID::PI0);
27 declare(DS, "DS");
28 // histos
29 book(_h_KK[0],1,1,1);
30 book(_h_KK[1],1,1,2);
31 book(_h_Kmpi ,1,1,3);
32 book(_h_Kppi ,1,1,4);
33 book(_dalitz, "dalitz",50,0.3,3.5,50,0.07,2.5);
34 }
35
36 /// Perform the per-event analysis
37 void analyze(const Event& event) {
38 static const map<PdgId,unsigned int> & mode = { { 211,1}, { 321,1}, {-321,1} };
39 static const map<PdgId,unsigned int> & modeCC = { {-211,1}, { 321,1}, {-321,1} };
40 // Loop over D+ mesons
41 DecayedParticles DS = apply<DecayedParticles>(event, "DS");
42 for(unsigned int ix=0;ix<DS.decaying().size();++ix) {
43 int sign = 1;
44 if ( DS.modeMatches(ix,3,mode )) sign = 1;
45 else if( DS.modeMatches(ix,3,modeCC)) sign =-1;
46 else
47 continue;
48 const Particle & pip = DS.decayProducts()[ix].at( sign*211)[0];
49 const Particle & Km = DS.decayProducts()[ix].at(-sign*321)[0];
50 const Particle & Kp = DS.decayProducts()[ix].at( sign*321)[0];
51 double mplus = (Kp.momentum()+pip.momentum()).mass2();
52 double mminus = (Km.momentum()+pip.momentum()).mass2();
53 double mKK = (Kp.momentum()+Km .momentum()).mass2();
54 _h_KK[0]->fill(mKK);
55 _h_KK[1]->fill(mKK);
56 _h_Kppi->fill(mplus);
57 _h_Kmpi->fill(mminus);
58 _dalitz->fill(mKK,mminus);
59 }
60 }
61
62
63 /// Normalise histograms etc., after the run
64 void finalize() {
65 normalize(_h_KK[0]);
66 normalize(_h_KK[1],1.,false);
67 normalize(_h_Kmpi);
68 normalize(_h_Kppi);
69 normalize(_dalitz);
70 }
71
72 /// @}
73
74
75 /// @name Histograms
76 /// @{
77 Histo1DPtr _h_KK[2],_h_Kmpi,_h_Kppi;
78 Histo2DPtr _dalitz;
79 /// @}
80
81
82 };
83
84
85 RIVET_DECLARE_PLUGIN(BABAR_2010_I878120);
86
87}
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