Rivet analyses referenceBESIII_2023_I2662580Mass distributions in $D^+\to K^0_S\pi^+\pi^0\pi^0$ decaysExperiment: BESIII (BEPC) Inspire ID: 2662580 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the mass distributions in $D^+\to K^0_S\pi^+\pi^0\pi^0$ decays by the BESIII collaboration. 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: BESIII_2023_I2662580.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 D+ -> KS0 pi+ pi0 pi0
10 class BESIII_2023_I2662580 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2023_I2662580);
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==411);
24 declare(ufs, "UFS");
25 DecayedParticles DD(ufs);
26 DD.addStable(PID::PI0);
27 DD.addStable(PID::K0S);
28 declare(DD, "DD");
29 // histograms
30 for (unsigned int ix=0; ix<7; ++ix) {
31 book(_h[ix], 1, 1, 1+ix);
32 }
33 }
34
35
36 /// Perform the per-event analysis
37 void analyze(const Event& event) {
38 DecayedParticles DD = apply<DecayedParticles>(event, "DD");
39 // loop over particles
40 for (unsigned int ix=0; ix<DD.decaying().size(); ++ix) {
41 int sign = DD.decaying()[ix].pid()/DD.decaying()[ix].abspid();
42 if (!DD.modeMatches(ix,4,mode) && !DD.modeMatches(ix,4,modeCC)) continue;
43 const Particle & KS0 = DD.decayProducts()[ix].at( 310)[0];
44 const Particle & pip = DD.decayProducts()[ix].at( sign*211)[0];
45 const Particles& pi0 = DD.decayProducts()[ix].at( 111);
46 const double mpipi = (pi0[0].mom()+pi0[1].mom()).mass();
47 if (mpipi>0.46 && mpipi<0.52) continue;
48 _h[3]->fill(mpipi);
49 _h[2]->fill((KS0.mom()+pip.mom()).mass());
50 _h[5]->fill((KS0.mom()+pi0[0].mom()+pi0[1].mom()).mass());
51 _h[6]->fill((pip.mom()+pi0[0].mom()+pi0[1].mom()).mass());
52 for(unsigned int ix=0; ix<2; ++ix) {
53 _h[0]->fill((KS0.mom()+pi0[ix].mom()).mass());
54 _h[1]->fill((pip.mom()+pi0[ix].mom()).mass());
55 _h[4]->fill((KS0.mom()+pip.mom()+pi0[ix].mom()).mass());
56 }
57 }
58 }
59
60
61 /// Normalise histograms etc., after the run
62 void finalize() {
63 normalize(_h);
64 }
65
66 /// @}
67
68
69 /// @name Histograms
70 /// @{
71 Histo1DPtr _h[7];
72 const map<PdgId,unsigned int> mode = { {310,1}, { 211,1}, { 111,2} };
73 const map<PdgId,unsigned int> modeCC = { {310,1}, {-211,1}, { 111,2} };
74 /// @}
75
76
77 };
78
79
80 RIVET_DECLARE_PLUGIN(BESIII_2023_I2662580);
81
82}
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