Rivet analyses

title: 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

```c++ // -- C++ --

include "Rivet/Analysis.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief Charm hadrons at 91 GeV class DELPHI_1993_I356732 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(DELPHI_1993_I356732);


/// @name Analysis methods
///@{

/// Book histograms and initialise projections before the run
void init() {
  declare(UnstableParticles(), "UFS");

  book(_h_Xe_Ds, 1, 1, 1);
  book(_h_Xe_D0, 3, 1, 1);
  book(_h_Xe_Dp, 5, 1, 1);
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");

  // Accept all D*+- decays.
  for (const Particle& p : ufs.particles(Cuts::abspid == PID::DSTARPLUS || Cuts::abspid == PID::DPLUS
                                         || Cuts::abspid == PID::D0)) {
    // Scaled energy.
    const double energy = p.E() / GeV;
    const double scaledEnergy = 2. * energy / sqrtS();
    if (p.abspid() == PID::DSTARPLUS)
      _h_Xe_Ds->fill(scaledEnergy);
    else if (p.abspid() == PID::DPLUS)
      _h_Xe_Dp->fill(scaledEnergy);
    else
      _h_Xe_D0->fill(scaledEnergy);
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  scale(_h_Xe_Ds, 1. / sumOfWeights());
  scale(_h_Xe_Dp, 1. / sumOfWeights());
  scale(_h_Xe_D0, 1. / sumOfWeights());
}

///@}


/// @name Histograms
///@{
Histo1DPtr _h_Xe_Ds, _h_Xe_D0, _h_Xe_Dp;
///@}

};

RIVET_DECLARE_PLUGIN(DELPHI_1993_I356732);

} ```