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ARGUS_1993_I352983

Dalitz plot analysis of $D^0\to K^0_S\pi^+\pi^-$
Experiment: ARGUS (DORIS)
Inspire ID: 352983
Status: VALIDATED NOHEPDATA
Authors:
  • Peter Richardson
References:
  • Phys.Lett.B 308 (1993) 435-443
Beams: * *
Beam energies: ANY
Run details:
  • Any process producing D0

Kinematic distributions in the decay $D^0\to K^0_S\pi^+\pi^-$. Data were read from figure 3 in the paper and the backgrounds given subtracted.

Source code: ARGUS_1993_I352983.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 pi+ pi-
10  class ARGUS_1993_I352983 : public Analysis {
11  public:
12
13    /// Constructor
14    RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1993_I352983);
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      for (unsigned int ix=0; ix<3; ++ix) {
32        book(_h[ix],1,1,1+ix);
33      }
34    }
35
36
37    /// Perform the per-event analysis
38    void analyze(const Event& event) {
39      // define the decay mode
40      DecayedParticles D0 = apply<DecayedParticles>(event, "D0");
41      // loop over particles
42      for (unsigned int ix=0; ix<D0.decaying().size(); ++ix) {
43        if (!D0.modeMatches(ix,3,mode) ) continue;
44        int sign = D0.decaying()[ix].pid()/421;
45        const Particles & pip= D0.decayProducts()[ix].at( sign*211);
46        const Particles & pim= D0.decayProducts()[ix].at(-sign*211);
47        const Particles & K0 = D0.decayProducts()[ix].at( 310);
48        double mminus = (pim[0].mom()+K0[0].mom() ).mass2();
49        double mplus  = (pip[0].mom()+K0[0].mom() ).mass2();
50        double mpipi  = (pip[0].mom()+pim[0].mom()).mass2();
51        _h[2]->fill(mplus);
52        _h[1]->fill(mminus);
53        _h[0]->fill(mpipi);
54      }
55    }
56
57
58    /// Normalise histograms etc., after the run
59    void finalize() {
60      normalize(_h, 1.0, false);
61    }
62
63    /// @}
64
65
66    /// @name Histograms
67    /// @{
68    Histo1DPtr _h[3];
69    const map<PdgId,unsigned int> mode = { { 310,1}, { 211,1},{-211,1}};
70    /// @}
71
72
73  };
74
75
76  RIVET_DECLARE_PLUGIN(ARGUS_1993_I352983);
77
78}