Rivet analyses referenceBELLE_2005_I660759Mass distributions in $\Xi^0_c\to pK^-K^-\pi^+$Experiment: BELLE (KEKB) Inspire ID: 660759 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the mass distributions in the decay $\Xi^0_c\to pK^-K^-\pi^+$ by BELLE. The data were read from the plots in the paper, and for many points the error bars are the size of the point. Source code: BELLE_2005_I660759.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 Xi_c0 -> p K- K- pi+
10 class BELLE_2005_I660759 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2005_I660759);
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==4132);
24 declare(ufs, "UFS");
25 DecayedParticles XIC0(ufs);
26 XIC0.addStable(PID::PI0);
27 XIC0.addStable(PID::K0S);
28 XIC0.addStable(PID::ETA);
29 XIC0.addStable(PID::ETAPRIME);
30 declare(XIC0, "XIC0");
31 // histograms
32 book(_h,1,1,1);
33 }
34
35
36 /// Perform the per-event analysis
37 void analyze(const Event& event) {
38 static const map<PdgId,unsigned int> & mode = { { PID::KMINUS,2}, { PID::PROTON,1}, { PID::PIPLUS ,1}};
39 static const map<PdgId,unsigned int> & modeCC = { { PID::KPLUS ,2}, {-PID::PROTON,1}, { PID::PIMINUS,1}};
40 DecayedParticles XIC0 = apply<DecayedParticles>(event, "XIC0");
41 // loop over particles
42 for(unsigned int ix=0;ix<XIC0.decaying().size();++ix) {
43 int sign = 1;
44 if (XIC0.decaying()[ix].pid()>0 && XIC0.modeMatches(ix,4,mode)) {
45 sign=1;
46 }
47 else if (XIC0.decaying()[ix].pid()<0 && XIC0.modeMatches(ix,4,modeCC)) {
48 sign=-1;
49 }
50 else
51 continue;
52 const Particle & pip = XIC0.decayProducts()[ix].at( sign*PID::PIPLUS)[0];
53 const Particles & Km = XIC0.decayProducts()[ix].at( sign*PID::KMINUS);
54 for(unsigned int ix=0;ix<2;++ix)
55 _h->fill((pip.momentum()+Km[ix].momentum()).mass());
56 }
57 }
58
59
60 /// Normalise histograms etc., after the run
61 void finalize() {
62 normalize(_h);
63 }
64
65 /// @}
66
67
68 /// @name Histograms
69 /// @{
70 Histo1DPtr _h;
71 /// @}
72
73
74 };
75
76
77 RIVET_DECLARE_PLUGIN(BELLE_2005_I660759);
78
79}
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