Rivet analyses referenceBESIII_2022_I1945692Dalitz decay of $D^+_s\to K^0_SK^0_S\pi^+$Experiment: BESIII (BEPC) Inspire ID: 1945692 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the mass distributions in the decay $D^+_s\to K^0_SK^0_S\pi^+$ by BES. 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_2022_I1945692.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_s+ -> KS0 KS0 pi+
10 class BESIII_2022_I1945692 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2022_I1945692);
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==431);
24 declare(ufs, "UFS");
25 DecayedParticles DS(ufs);
26 DS.addStable(PID::PI0);
27 DS.addStable(PID::K0S);
28 declare(DS,"DS");
29 // histograms
30 book(_h_KK ,1,1,1);
31 book(_h_Kpi,1,1,2);
32 book(_dalitz,"dalitz",50,0.3,2.3,50,0.3,2.3);
33 }
34
35 /// Perform the per-event analysis
36 void analyze(const Event& event) {
37 static const map<PdgId,unsigned int> & mode = { { 211,1}, {310,2}};
38 static const map<PdgId,unsigned int> & modeCC = { {-211,1}, {310,2}};
39 DecayedParticles DS = apply<DecayedParticles>(event, "DS");
40 // loop over particles
41 for(unsigned int ix=0;ix<DS.decaying().size();++ix) {
42 int sign = 1;
43 if (DS.decaying()[ix].pid()>0 && DS.modeMatches(ix,3,mode)) {
44 sign=1;
45 }
46 else if (DS.decaying()[ix].pid()<0 && DS.modeMatches(ix,3,modeCC)) {
47 sign=-1;
48 }
49 else
50 continue;
51 const Particles & K0 = DS.decayProducts()[ix].at( 310);
52 const Particle & pip = DS.decayProducts()[ix].at( sign*211)[0];
53 double m1 = (K0[0].momentum()+pip.momentum()).mass2();
54 double m2 = (K0[1].momentum()+pip.momentum()).mass2();
55 double mKK = (K0[0].momentum()+K0[1].momentum()).mass2();
56 _dalitz->fill(m1,m2);
57 _dalitz->fill(m2,m1);
58 _h_KK->fill(sqrt(mKK));
59 _h_Kpi->fill(sqrt(m1));
60 _h_Kpi->fill(sqrt(m2));
61 }
62 }
63
64
65 /// Normalise histograms etc., after the run
66 void finalize() {
67 normalize(_h_Kpi);
68 normalize(_h_KK );
69 normalize(_dalitz);
70 }
71
72 /// @}
73
74
75 /// @name Histograms
76 /// @{
77 Histo1DPtr _h_Kpi,_h_KK;
78 Histo2DPtr _dalitz;
79 /// @}
80
81
82 };
83
84
85 RIVET_DECLARE_PLUGIN(BESIII_2022_I1945692);
86
87}
|
