Rivet analyses

title: JADE_1979_I142874

Charged hadron multiplicity

Experiment: JADE (PETRA)

Inspire ID: 142874

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Lett. B88 (1979) 171-176, 1979

Beams: e- e+

Beam energies: (11.0, 11.0); (13.8, 13.8); (15.0, 15.0); (15.8, 15.8)GeV

Run details: - e+e- to hadrons

Charged hadron multiplicity at a range of energies, use with care as its not clear if $K_S^0$ decays are included of not, within the systematic error of 1.5

Source code:JADE_1979_I142874.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/ChargedFinalState.hh"

namespace Rivet {

/// @brief Add a short analysis description here class JADE_1979_I142874 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(JADE_1979_I142874);


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

/// Book histograms and initialise projections before the run
void init() {

  // Initialise and register projections
  declare(ChargedFinalState(), "FS");
  book(_mult, 2, 1, 1);
  for (const string& en : _mult.binning().edges<0>()) {
    const double eval = stod(en) * GeV;
    if (isCompatibleWithSqrtS(eval)) {
      _sqs = en;
      break;
    }
  }
  raiseBeamErrorIf(_sqs.empty());
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  const ChargedFinalState& fs = apply<ChargedFinalState>(event, "FS");
  _mult->fill(_sqs, fs.particles().size());
}

/// @}


/// @name Histograms
/// @{
BinnedProfilePtr<string> _mult;
string _sqs = "";
/// @}

};

RIVET_DECLARE_PLUGIN(JADE_1979_I142874); } ```