Rivet analyses

title: MARKII_1982_I178416

Charged particle momentum distributions 5.2, 6.2 and 29 GeV

Experiment: MARKII (PEP)

Inspire ID: 178416

Status: VALIDATED

Authors: - Peter Richardson

References: none listed

Beams: e- e+

Beam energies: (2.6, 2.6); (3.2, 3.2); (14.5, 14.5)GeV

Run details: - e+e- > hadrons.

Charged particle momentum distributions for 5.2, 6.2 and 29 GeV.

Source code:MARKII_1982_I178416.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/ChargedFinalState.hh"

namespace Rivet {

/// @brief Charged particle spectra at 5.2, 6.5 and 29 GeV class MARKII_1982_I178416 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(MARKII_1982_I178416);


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

/// Book histograms and initialise projections before the run
void init() {
  const ChargedFinalState fs;
  declare(fs, "FS");
  size_t ih = 0;
  for (double eVal : allowedEnergies()) {
    const string en = toString(round(eVal / MeV));
    if (isCompatibleWithSqrtS(eVal)) _sqs = en;
    book(_h[en], 1, 1, ++ih);
  }
  raiseBeamErrorIf(_sqs.empty());
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  const ChargedFinalState& fs = apply<ChargedFinalState>(event, "FS");
  if (fs.particles().size() == 2 && fs.particles()[0].abspid() == 13 && fs.particles()[1].abspid() == 13)
    vetoEvent;
  for (const Particle& p : fs.particles()) {
    const Vector3 mom3 = p.p3();
    double pp = mom3.mod();
    double x = 2. * pp / sqrtS();
    _h[_sqs]->fill(x);
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  for (auto& item : _h) {
    const double en = stod(item.first) * MeV;
    scale(item.second, crossSection() * sqr(en) / sumOfWeights() / microbarn);
  }
}

///@}


/// @name Histograms
///@{
map<string, Histo1DPtr> _h;
string _sqs = "";
///@}

};

RIVET_DECLARE_PLUGIN(MARKII_1982_I178416);

} ```