Rivet analyses referenceBABAR_2007_I749390Dalitz plot analysis of $D^0\to K^+K^-\pi^0$Experiment: BABAR (PEP-II) Inspire ID: 749390 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the mass distributions in the decay $D^0\to K^+K^-\pi^0$ by BaBar. The data were read from the plots in the paper. It is also not clear that any resolution effects have been unfolded or backgrounds removed. Source code: BABAR_2007_I749390.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 -> K+K-pi0
10 class BABAR_2007_I749390 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2007_I749390);
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_Kppi ,1,1,1);
33 book(_h_Kmpi ,1,1,2);
34 book(_h_KK ,1,1,3);
35 book(_dalitz, "dalitz",50,0.3,2.1,50,0.3,2.1);
36 }
37
38 /// Perform the per-event analysis
39 void analyze(const Event& event) {
40 static const map<PdgId,unsigned int> & mode = { { 321,1},{-321,1}, {111,1}};
41 DecayedParticles D0 = apply<DecayedParticles>(event, "D0");
42 // loop over particles
43 for(unsigned int ix=0;ix<D0.decaying().size();++ix) {
44 if( ! D0.modeMatches(ix,3,mode) ) continue;
45 int sign = D0.decaying()[ix].pid()/421;
46 const Particles & pi0 = D0.decayProducts()[ix].at(111);
47 const Particles & Kp = D0.decayProducts()[ix].at( sign*321);
48 const Particles & Km = D0.decayProducts()[ix].at(-sign*321);
49 double mplus = (Kp[0].momentum()+pi0[0].momentum()).mass2();
50 double mminus = (Km[0].momentum()+pi0[0].momentum()).mass2();
51 double mKK = (Kp[0].momentum()+Km [0].momentum()).mass2();
52 _h_KK ->fill(mKK);
53 _h_Kppi->fill(mplus);
54 _h_Kmpi->fill(mminus);
55 _dalitz->fill(mminus,mplus);
56 }
57 }
58
59
60 /// Normalise histograms etc., after the run
61 void finalize() {
62 normalize(_h_KK );
63 normalize(_h_Kmpi);
64 normalize(_h_Kppi);
65 normalize(_dalitz);
66 }
67
68 /// @}
69
70
71 /// @name Histograms
72 /// @{
73 Histo1DPtr _h_KK,_h_Kmpi,_h_Kppi;
74 Histo2DPtr _dalitz;
75 /// @}
76
77
78 };
79
80
81 RIVET_DECLARE_PLUGIN(BABAR_2007_I749390);
82
83}
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