Rivet analyses referenceBABAR_2006_I722905Kinematic distributions in the decays $D^0\to K^\mp\pi^\pm\pi^0$Experiment: BABAR (PEP-II) Inspire ID: 722905 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Kinematic distributions in the decays $D^0\to K^\mp\pi^\pm\pi^0$. Data read from plots Source code: BABAR_2006_I722905.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- pi+ pi0 (or CC)
10 class BABAR_2006_I722905 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2006_I722905);
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 for(unsigned int ix=0;ix<2;++ix)
33 book(_h[ix],1+ix,1,1);
34 }
35
36
37 /// Perform the per-event analysis
38 void analyze(const Event& event) {
39 static const map<PdgId,unsigned int> & mode = { {-321,1},{ 211,1}, {111,1}};
40 static const map<PdgId,unsigned int> & modeCC = { { 321,1},{-211,1}, {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 int sign = 1;
45 if (D0.modeMatches(ix,3,mode)) {
46 sign = 1;
47 }
48 else if (D0.modeMatches(ix,3,modeCC)) {
49 sign =-1;
50 }
51 else
52 continue;
53 const Particle & pi0= D0.decayProducts()[ix].at(111)[0];
54 const Particle & Km = D0.decayProducts()[ix].at(-sign*321)[0];
55 double m2 = (pi0.momentum()+Km.momentum()).mass2();
56 if( (D0.decaying()[ix].pid()>0 && sign== 1) ||
57 (D0.decaying()[ix].pid()<0 && sign== -1) )
58 _h[0]->fill(m2);
59 else
60 _h[1]->fill(m2);
61 }
62 }
63
64
65 /// Normalise histograms etc., after the run
66 void finalize() {
67 for(unsigned int ix=0;ix<2;++ix)
68 normalize(_h[ix]);
69 }
70
71 /// @}
72
73
74 /// @name Histograms
75 /// @{
76 Histo1DPtr _h[2];
77 /// @}
78
79
80 };
81
82
83 RIVET_DECLARE_PLUGIN(BABAR_2006_I722905);
84
85}
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