Rivet analyses referenceBESIII_2022_I2088218Mass distributions in the decay D+s→K+π+π−π0Experiment: BESIII (BEPC) Inspire ID: 2088218 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY
Measurement of the mass distributions in the decay D+s→K+π+π−π0 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_I2088218.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 Ds -> K+pi+pi-pi0
10 class BESIII_2022_I2088218 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2022_I2088218);
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 // histos
30 for(unsigned int ix=0;ix<10;++ix)
31 book(_h[ix],1,1,1+ix);
32 }
33
34 /// Perform the per-event analysis
35 void analyze(const Event& event) {
36 static const map<PdgId,unsigned int> & mode = { { 211,1}, {-211,1}, { 321,1}, {111,1}};
37 static const map<PdgId,unsigned int> & modeCC = { { 211,1}, {-211,1}, {-321,1}, {111,1}};
38 DecayedParticles DS = apply<DecayedParticles>(event, "DS");
39 // loop over particles
40 for(unsigned int ix=0;ix<DS.decaying().size();++ix) {
41 int sign = 1;
42 if (DS.decaying()[ix].pid()>0 && DS.modeMatches(ix,4,mode)) {
43 sign=1;
44 }
45 else if (DS.decaying()[ix].pid()<0 && DS.modeMatches(ix,4,modeCC)) {
46 sign=-1;
47 }
48 else
49 continue;
50 const Particle & pip = DS.decayProducts()[ix].at( sign*211)[0];
51 const Particle & pim = DS.decayProducts()[ix].at(-sign*211)[0];
52 const Particle & Kp = DS.decayProducts()[ix].at( sign*321)[0];
53 const Particle & pi0 = DS.decayProducts()[ix].at( 111)[0];
54 double mpipi = (pim.momentum()+pip.momentum()).mass();
55 if (mpipi>.46 && mpipi<.52) continue;
56 _h[0]->fill((Kp .momentum()+pim.momentum()).mass());
57 _h[1]->fill((Kp .momentum()+pi0.momentum()).mass());
58 _h[2]->fill(mpipi);
59 _h[3]->fill((pip.momentum()+pi0.momentum()).mass());
60 _h[4]->fill((pim.momentum()+pi0.momentum()).mass());
61 _h[5]->fill((Kp .momentum()+pim.momentum()+pi0.momentum()).mass());
62 _h[6]->fill((pip.momentum()+pim.momentum()+pi0.momentum()).mass());
63 _h[7]->fill((Kp .momentum()+pip.momentum()).mass());
64 _h[8]->fill((Kp .momentum()+pip.momentum()+pi0.momentum()).mass());
65 _h[9]->fill((Kp .momentum()+pip.momentum()+pim.momentum()).mass());
66 }
67 }
68
69
70 /// Normalise histograms etc., after the run
71 void finalize() {
72 for(unsigned int ix=0;ix<10;++ix)
73 normalize(_h[ix],1.,false);
74 }
75
76 /// @}
77
78
79 /// @name Histograms
80 /// @{
81 Histo1DPtr _h[10];
82 /// @}
83
84
85 };
86
87
88 RIVET_DECLARE_PLUGIN(BESIII_2022_I2088218);
89
90}
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