Rivet analyses referenceBESIII_2023_I2696635Dalitz decay $D^+\to K^0_S\pi^+\eta$Experiment: BESIII (BEPC) Inspire ID: 2696635 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the mass distributions in the decay $D^+\to K^0_S\pi^+\eta$ by BES. The data were read from the plots in the paper. It is also not clear that any resolution effects have been unfolded. Source code: BESIII_2023_I2696635.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+ -> K0S pi+ eta
10 class BESIII_2023_I2696635 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2023_I2696635);
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 DP(ufs);
26 DP.addStable(PID::PI0);
27 DP.addStable(PID::K0S);
28 DP.addStable(PID::ETA);
29 declare(DP,"DP");
30 // histograms#
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 DecayedParticles DP = apply<DecayedParticles>(event, "DP");
40 // loop over particles
41 for (unsigned int ix=0; ix<DP.decaying().size(); ++ix) {
42 int sign = 1;
43 if (DP.decaying()[ix].pid()>0 && DP.modeMatches(ix,3,mode)) {
44 sign=1;
45 }
46 else if (DP.decaying()[ix].pid()<0 && DP.modeMatches(ix,3,modeCC)) {
47 sign=-1;
48 }
49 else {
50 continue;
51 }
52 const Particle& pip = DP.decayProducts()[ix].at( sign*211)[0];
53 const Particle& KS0 = DP.decayProducts()[ix].at( 310)[0];
54 const Particle& eta = DP.decayProducts()[ix].at( 221)[0];
55 _h[0]->fill((pip.mom()+KS0.mom()).mass()/GeV);
56 _h[1]->fill((eta.mom()+KS0.mom()).mass()/GeV);
57 _h[2]->fill((pip.mom()+eta.mom()).mass()/GeV);
58 }
59 }
60
61
62 /// Normalise histograms etc., after the run
63 void finalize() {
64 normalize(_h, 1.0, false);
65 }
66
67 /// @}
68
69
70 /// @name Histograms
71 /// @{
72 Histo1DPtr _h[3];
73 const map<PdgId,unsigned int> mode = { { 211,1}, { 310,1}, { 221,1}};
74 const map<PdgId,unsigned int> modeCC = { {-211,1}, { 310,1}, { 221,1}};
75 /// @}
76
77
78 };
79
80
81 RIVET_DECLARE_PLUGIN(BESIII_2023_I2696635);
82
83}
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