Rivet analyses referenceCLEO_2012_I1086166Mass distributions in the decay $D^0\to K^+K^-\pi^+\pi^-$Experiment: CLEO (CESR) Inspire ID: 1086166 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the mass distributions in the decay $D^0\to K^+K^-\pi^+\pi^-$ by CLEO. 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: CLEO_2012_I1086166.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 D0 -> K+ K- pi+ pi-
10 class CLEO_2012_I1086166 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(CLEO_2012_I1086166);
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==421);
24 declare(ufs, "UFS");
25 DecayedParticles D0(ufs);
26 D0.addStable(PID::PI0);
27 D0.addStable(PID::K0S);
28 D0.addStable(PID::ETA);
29 D0.addStable(PID::ETAPRIME);
30 declare(D0, "D0");
31 // histograms
32 for(unsigned int ix=0;ix<6;++ix)
33 book(_h[ix],1,1,1+ix);
34 for(unsigned int ix=0;ix<4;++ix)
35 book(_h[ix+6],2,1,1+ix);
36 }
37
38
39 /// Perform the per-event analysis
40 void analyze(const Event& event) {
41 // define the decay mode
42 static const map<PdgId,unsigned int> & mode = { { 321,1},{ -321,1}, { 211,1}, { -211,1}};
43 DecayedParticles D0 = apply<DecayedParticles>(event, "D0");
44 // loop over particles
45 for(unsigned int ix=0;ix<D0.decaying().size();++ix) {
46 if ( !D0.modeMatches(ix,4,mode)) continue;
47 int sign = D0.decaying()[ix].pid()/421;
48 const Particles & Kp = D0.decayProducts()[ix].at( sign*321);
49 const Particles & Km = D0.decayProducts()[ix].at(-sign*321);
50 const Particles & pip= D0.decayProducts()[ix].at( sign*211);
51 const Particles & pim= D0.decayProducts()[ix].at(-sign*211);
52 _h[0]->fill((Kp [0].momentum()+Km [0].momentum()).mass2());
53 _h[1]->fill((Kp [0].momentum()+pip[0].momentum()).mass2());
54 _h[2]->fill((Kp [0].momentum()+pim[0].momentum()).mass2());
55 _h[3]->fill((Km [0].momentum()+pip[0].momentum()).mass2());
56 _h[4]->fill((Km [0].momentum()+pim[0].momentum()).mass2());
57 _h[5]->fill((pip[0].momentum()+pim[0].momentum()).mass2());
58 _h[6]->fill((Kp [0].momentum()+Km [0].momentum()+pip[0].momentum()).mass2());
59 _h[7]->fill((Kp [0].momentum()+Km [0].momentum()+pim[0].momentum()).mass2());
60 _h[8]->fill((Kp [0].momentum()+pip[0].momentum()+pim[0].momentum()).mass2());
61 _h[9]->fill((Km [0].momentum()+pip[0].momentum()+pim[0].momentum()).mass2());
62 }
63 }
64
65
66 /// Normalise histograms etc., after the run
67 void finalize() {
68 for(unsigned int ix=0;ix<10;++ix)
69 normalize(_h[ix],1.,false);
70 }
71
72 /// @}
73
74
75 /// @name Histograms
76 /// @{
77 Histo1DPtr _h[10];
78 /// @}
79
80
81 };
82
83
84 RIVET_DECLARE_PLUGIN(CLEO_2012_I1086166);
85
86}
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