Rivet analyses referenceFOCUS_2003_I626320Mass distributions in the $D^0\to K^-K^-K^+\pi^+$Experiment: FOCUS (Fermilab) Inspire ID: 626320 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the mass distributions in the decay $D^0\to K^-K^-K^+\pi^+$ by FOCUS. 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: FOCUS_2003_I626320.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+K-pi+
10 class FOCUS_2003_I626320 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(FOCUS_2003_I626320);
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 for(unsigned int ix=0;ix<2;++ix)
32 book(_h[ix],1,1,1+ix);
33 }
34
35 /// Perform the per-event analysis
36 void analyze(const Event& event) {
37 // define the decay mode
38 static const map<PdgId,unsigned int> & mode = { { 321,1}, {-321,2},{ 211,1}};
39 static const map<PdgId,unsigned int> & modeCC = { {-321,1}, { 321,2},{-211,1}};
40 DecayedParticles D0 = apply<DecayedParticles>(event, "D0");
41 // loop over particles
42 for(unsigned int ix=0;ix<D0.decaying().size();++ix) {
43 int sign = 1;
44 if (D0.decaying()[ix].pid()>0 && D0.modeMatches(ix,4,mode)) {
45 sign=1;
46 }
47 else if (D0.decaying()[ix].pid()<0 && D0.modeMatches(ix,4,modeCC)) {
48 sign=-1;
49 }
50 else
51 continue;
52 const Particles & Kp = D0.decayProducts()[ix].at( sign*321);
53 const Particles & Km = D0.decayProducts()[ix].at(-sign*321);
54 const Particles & pip= D0.decayProducts()[ix].at( sign*211);
55 _h[0]->fill((Kp [0].momentum()+Km [0].momentum()).mass());
56 _h[0]->fill((Kp [0].momentum()+Km [1].momentum()).mass());
57 _h[1]->fill((Km [0].momentum()+pip[0].momentum()).mass());
58 _h[1]->fill((Km [1].momentum()+pip[0].momentum()).mass());
59 }
60 }
61
62
63 /// Normalise histograms etc., after the run
64 void finalize() {
65 for(unsigned int ix=0;ix<2;++ix)
66 normalize(_h[ix],1.,false);
67 }
68
69 /// @}
70
71
72 /// @name Histograms
73 /// @{
74 Histo1DPtr _h[2];
75 /// @}
76
77
78 };
79
80
81 RIVET_DECLARE_PLUGIN(FOCUS_2003_I626320);
82
83}
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