Rivet analyses referenceBESIII_2022_I2051683Mass distributions in the decay $D^+_s\to K^+K^-\pi^+\pi^+\pi^-$Experiment: BESIII (BEPC) Inspire ID: 2051683 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the mass distributions in the decay $D^+_s\to K^+K^-\pi^+\pi^+\pi^-$ 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_I2051683.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/UnstableParticles.hh"
4
5namespace Rivet {
6
7
8 /// @brief Ds -> K+K-pi+pi+pi-
9 class BESIII_2022_I2051683 : public Analysis {
10 public:
11
12 /// Constructor
13 RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2022_I2051683);
14
15
16 /// @name Analysis methods
17 /// @{
18
19 /// Book histograms and initialise projections before the run
20 void init() {
21 // Initialise and register projections
22 declare(UnstableParticles(), "UFS");
23 for(unsigned int ix=0;ix<10;++ix)
24 book(_h[ix],1,1,1+ix);
25 }
26
27 void findDecayProducts(const Particle & mother, unsigned int & nstable,
28 Particles & pip , Particles & pim ,
29 Particles & Kp , Particles & Km ) {
30 for(const Particle & p : mother.children()) {
31 int id = p.pid();
32 if ( id == PID::KPLUS ) {
33 Kp.push_back(p);
34 ++nstable;
35 }
36 else if (id == PID::KMINUS ) {
37 Km.push_back(p);
38 ++nstable;
39 }
40 else if (id == PID::PIPLUS) {
41 pip.push_back(p);
42 ++nstable;
43 }
44 else if (id == PID::PIMINUS) {
45 pim.push_back(p);
46 ++nstable;
47 }
48 else if (id == PID::PI0 || id == PID::K0S||id == PID::K0L) {
49 ++nstable;
50 }
51 else if ( !p.children().empty() ) {
52 findDecayProducts(p, nstable, pip, pim, Kp , Km);
53 }
54 else
55 ++nstable;
56 }
57 }
58
59 /// Perform the per-event analysis
60 void analyze(const Event& event) {
61 for(const Particle& meson : apply<UnstableParticles>(event, "UFS").particles(Cuts::abspid== 431)) {
62 unsigned int nstable(0);
63 Particles pip, pim, Kp , Km;
64 findDecayProducts(meson, nstable, pip, pim, Kp , Km);
65 if (nstable!=5) continue;
66 if(meson.pid()<0) {
67 swap(pim,pip);
68 swap(Kp,Km);
69 }
70 if(pip.size()==2&&Km.size()==1&&Kp.size()==1&&pim.size()==1) {
71 double mpippim[2] = {(pim[0].momentum()+pip[0].momentum()).mass(),
72 (pim[0].momentum()+pip[1].momentum()).mass()};
73 if(mpippim[0]>mpippim[1]) {
74 swap( pip[0], pip[1]);
75 swap(mpippim[0],mpippim[1]);
76 }
77 double mKK = (Kp[0].momentum()+Km[0].momentum()).mass();
78 _h[0]->fill(mKK);
79 _h[1]->fill(mKK);
80 _h[2]->fill(mpippim[0]);
81 _h[3]->fill(mpippim[1]);
82 _h[4]->fill((Kp [0].momentum()+Km [0].momentum()+pim[0].momentum()).mass());
83 _h[5]->fill((Km [0].momentum()+pip[1].momentum()+pim[0].momentum()).mass());
84 _h[6]->fill((Kp [0].momentum()+pip[0].momentum()+pim[0].momentum()).mass());
85 _h[7]->fill((pim[0].momentum()+pip[0].momentum()+pip[1].momentum()).mass());
86 _h[8]->fill((Kp [0].momentum()+Km [0].momentum()+pip[1].momentum()+pim[0].momentum()).mass());
87 _h[9]->fill((Km [0].momentum()+pip[0].momentum()+pip[1].momentum()+pim[0].momentum()).mass());
88 }
89 }
90 }
91
92
93 /// Normalise histograms etc., after the run
94 void finalize() {
95 for(unsigned int ix=0;ix<10;++ix)
96 normalize(_h[ix],1.,false);
97 }
98
99 /// @}
100
101
102 /// @name Histograms
103 /// @{
104 Histo1DPtr _h[10];
105 /// @}
106
107
108 };
109
110
111 RIVET_DECLARE_PLUGIN(BESIII_2022_I2051683);
112
113}
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