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DELPHI_1993_I356732

Charmed Meson spectra at LEPI
Experiment: DELPHI (LEP)
Inspire ID: 356732
Status: VALIDATED
Authors:
  • Peter Richardson
References:
  • Z.Phys.C 59 (1993) 533-546, 1993
Beams: e+ e-
Beam energies: (45.6, 45.6) GeV
Run details:
  • Hadronic $Z$ decays at 91.2 GeV.

Measurement of the spectra for $D^{*\pm$} $D^0$ and $D^\pm$ measured by DELPHI. Rather than the event rates in HEPData values read from Figs6-8 in the original paper are used with the branching ratios corrected using the PDG 2020 values.

Source code: DELPHI_1993_I356732.cc
 1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/UnstableParticles.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// @brief Charm hadrons at 91 GeV
 9  class DELPHI_1993_I356732 : public Analysis {
10  public:
11
12    /// Constructor
13    RIVET_DEFAULT_ANALYSIS_CTOR(DELPHI_1993_I356732);
14
15
16    /// @name Analysis methods
17    ///@{
18
19    /// Book histograms and initialise projections before the run
20    void init() {
21      declare(UnstableParticles(), "UFS");
22
23      book(_h_Xe_Ds  , 1, 1, 1);
24      book(_h_Xe_D0  , 3, 1, 1);
25      book(_h_Xe_Dp  , 5, 1, 1);
26    }
27
28
29    /// Perform the per-event analysis
30    void analyze(const Event& event) {
31      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
32      
33      // Accept all D*+- decays. 
34      for (const Particle& p : ufs.particles(Cuts::abspid==PID::DSTARPLUS ||
35					     Cuts::abspid==PID::DPLUS ||
36					     Cuts::abspid==PID::D0)) {
37	// Scaled energy.
38	const double energy = p.E()/GeV;
39	const double scaledEnergy = 2.*energy/sqrtS();
40	if(p.abspid()==PID::DSTARPLUS)
41	   _h_Xe_Ds->fill(scaledEnergy);
42	else if(p.abspid()==PID::DPLUS)
43	   _h_Xe_Dp->fill(scaledEnergy);
44	else
45	   _h_Xe_D0->fill(scaledEnergy);
46      }
47    }
48
49
50    /// Normalise histograms etc., after the run
51    void finalize() {
52      scale(_h_Xe_Ds  , 1./sumOfWeights());
53      scale(_h_Xe_Dp  , 1./sumOfWeights());
54      scale(_h_Xe_D0  , 1./sumOfWeights());
55    }
56
57    ///@}
58
59
60    /// @name Histograms
61    ///@{
62    Histo1DPtr _h_Xe_Ds,_h_Xe_D0,_h_Xe_Dp;
63    ///@}
64
65
66  };
67
68
69  RIVET_DECLARE_PLUGIN(DELPHI_1993_I356732);
70
71}