Rivet analyses referenceCLEO_2004_I649917Dalitz decay of $D^0\to K^0_S\pi^0\eta$Experiment: CLEO (CESR) Inspire ID: 649917 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the mass distributions in the decay $D^0\to K^0_S\pi^0\eta$ by CLEO. The data were read from the plots in the paper. It is also not clear that any resolution effects have been unfolded. Source code: CLEO_2004_I649917.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 D0 -> KS0 pi0 eta
10 class CLEO_2004_I649917 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(CLEO_2004_I649917);
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==421);
24 declare(ufs, "UFS");
25 DecayedParticles D0(ufs);
26 D0.addStable(PID::PI0);
27 D0.addStable(PID::K0S);
28 D0.addStable(PID::ETA);
29 D0.addStable(PID::ETAPRIME);
30 declare(D0, "D0");
31 // histograms
32 book(_h_Kpi ,1,1,1);
33 book(_h_etapi,1,1,2);
34 book(_h_Keta ,1,1,3);
35 book(_dalitz, "dalitz",50,0.4,1.9,50,0.3,1.8);
36 }
37
38 /// Perform the per-event analysis
39 void analyze(const Event& event) {
40 // define the decay mode
41 static const map<PdgId,unsigned int> & mode = { { 310,1}, { 221,1},{ 111,1}};
42 DecayedParticles D0 = apply<DecayedParticles>(event, "D0");
43 // loop over particles
44 for(unsigned int ix=0;ix<D0.decaying().size();++ix) {
45 if ( ! D0.modeMatches(ix,3,mode)) continue;
46 const Particles & pi0= D0.decayProducts()[ix].at(111);
47 const Particles & eta= D0.decayProducts()[ix].at(221);
48 const Particles & K0 = D0.decayProducts()[ix].at(310);
49 double metapi = (eta[0].momentum()+pi0[0].momentum()).mass2();
50 double metaK = (eta[0].momentum()+ K0[0].momentum()).mass2();
51 double mKpi = ( K0[0].momentum()+pi0[0].momentum()).mass2();
52 _dalitz ->fill(metapi,mKpi);
53 _h_etapi->fill(metapi);
54 _h_Keta ->fill(metaK );
55 _h_Kpi ->fill(mKpi);
56 }
57 }
58
59
60 /// Normalise histograms etc., after the run
61 void finalize() {
62 normalize(_h_Kpi );
63 normalize(_h_etapi);
64 normalize(_h_Keta );
65 normalize(_dalitz );
66 }
67
68 /// @}
69
70
71 /// @name Histograms
72 /// @{
73 Histo1DPtr _h_Kpi,_h_etapi,_h_Keta;
74 Histo2DPtr _dalitz;
75 /// @}
76
77
78 };
79
80
81 RIVET_DECLARE_PLUGIN(CLEO_2004_I649917);
82
83}
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