Rivet analyses referenceCLEO_2009_I822856Pion mass distribution in $D^+_s\to \omega\pi^+\pi^0$Experiment: CLEO (CESR) Inspire ID: 822856 Status: VALIDATED NOHEPDATA Authors:
Beam energies: ANY Run details:
Measurement of the pion mass distribution in $D^+_s\to \omega\pi^+\pi^0$. The data were read from the plots in the paper. Resolution/acceptance effects have been not unfolded. Given the agreement with the model in the paper this analysis should only be used for qualitative studies. Source code: CLEO_2009_I822856.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 D_s+ -> omega pi+ pi0
10 class CLEO_2009_I822856 : public Analysis {
11 public:
12
13 /// Constructor
14 RIVET_DEFAULT_ANALYSIS_CTOR(CLEO_2009_I822856);
15
16
17 /// @name Analysis methods
18 /// @{
19
20 /// Book histograms and initialise projections before the run
21 void init() {
22 // 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 DS.addStable(PID::ETA);
29 DS.addStable(PID::OMEGA);
30 DS.addStable(PID::ETAPRIME);
31 declare(DS, "DS");
32 // histograms
33 book(_h_pipi,1,1,1);
34 }
35
36
37 /// Perform the per-event analysis
38 void analyze(const Event& event) {
39 static const map<PdgId,unsigned int> & mode = { { 211,1},{ 111,1}, { 223,1}};
40 static const map<PdgId,unsigned int> & modeCC = { {-211,1},{ 111,1}, { 223,1}};
41 DecayedParticles DS = apply<DecayedParticles>(event, "DS");
42 // loop over particles
43 for(unsigned int ix=0;ix<DS.decaying().size();++ix) {
44 int sign = 1;
45 if (DS.decaying()[ix].pid()>0 && DS.modeMatches(ix,3,mode)) {
46 sign=1;
47 }
48 else if (DS.decaying()[ix].pid()<0 && DS.modeMatches(ix,3,modeCC)) {
49 sign=-1;
50 }
51 else
52 continue;
53 const Particles & pi0 = DS.decayProducts()[ix].at( 111);
54 const Particles & pip = DS.decayProducts()[ix].at( sign*211);
55 _h_pipi->fill((pi0[0].momentum()+pip[0].momentum()).mass());
56 }
57 }
58
59
60 /// Normalise histograms etc., after the run
61 void finalize() {
62 normalize(_h_pipi,1.,false);
63 }
64
65 /// @}
66
67
68 /// @name Histograms
69 /// @{
70 Histo1DPtr _h_pipi;
71 /// @}
72
73
74 };
75
76
77 RIVET_DECLARE_PLUGIN(CLEO_2009_I822856);
78
79}
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