Rivet analyses

title: DELPHI_1991_I301657

Hadronic Z decay charged multiplicity measurement

Experiment: DELPHI (LEP 1)

Inspire ID: 301657

Status: VALIDATED

Authors: - Peter Richardson

References: - Z.Phys. C50 (1991) 185-194

Beams: e+ e-

Beam energies: (45.6, 45.6)GeV

Run details: - Hadronic Z decay events generated on the Z pole ($\sqrt{s} = 91.2$ GeV)

The charged particle multiplicity distribution of hadronic Z decays, as measured on the peak of the Z resonance using the DELPHI detector at LEP.

Source code:DELPHI_1991_I301657.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/ChargedFinalState.hh"

namespace Rivet {

/// @brief DELPHI LEP1 charged multiplicity, code basically a copy of the ALEPH one /// @author Peter Richardson class DELPHI_1991_I301657 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(DELPHI_1991_I301657);


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

/// Book histograms and initialise projections before the run
void init() {
  const ChargedFinalState cfs;
  declare(cfs, "CFS");

  book(_histChTot, 2, 1, 1);
  book(_histAver, 4, 1, 1);
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  const FinalState& cfs = apply<FinalState>(event, "CFS");
  MSG_DEBUG("Total charged multiplicity = " << cfs.size());
  _histChTot->fill(cfs.size());
  _histAver->fill(sqrtS(), cfs.size());
}


/// Normalise histograms etc., after the run
void finalize() {
  scale(_histChTot, 100.0 / sumOfWeights()); // %age (100)
}

/// @}

private:

/// @name Histograms
/// @{
BinnedHistoPtr<int> _histChTot;
Profile1DPtr _histAver;
/// @}

};

RIVET_DECLARE_PLUGIN(DELPHI_1991_I301657);

} ```