Rivet analyses

title: DASP_1979_I132410

Inclusive $\eta$ production rate for energies between 3.99 and 5.01 GeV

Experiment: DASP (DORIS)

Inspire ID: 132410

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Lett. B80 (1979) 412-418, 1979

Beams: e- e+

Beam energies: ANY

Run details: - e+e- to hadrons between 3.99 and 5.01 GeV

Measurement of the rate for inclusive $\eta$ production rate for energies between 3.99 and 5.01 GeV by the DASP experiment.

Source code:DASP_1979_I132410.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief inclusive eta production class DASP_1979_I132410 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(DASP_1979_I132410);


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

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

  // Initialise and register projections
  declare(UnstableParticles(), "UFS");

  // Book histograms
  book(_c_eta, "/TMP/neta");
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
  _c_eta->fill(ufs.particles(Cuts::pid == 221).size());
}


/// Normalise histograms etc., after the run
void finalize() {
  scale(_c_eta, 1. / sumOfWeights() * crossSection() / nanobarn);
  Estimate1DPtr mult;
  book(mult, 1, 1, 1);
  for (auto& b : mult->bins()) {
    if (inRange(sqrtS() / GeV, b.xMin(), b.xMax())) {
      b.set(_c_eta->val(), _c_eta->err());
    }
  }
}

/// @}


/// @name Histograms
/// @{
CounterPtr _c_eta;
/// @}

};

RIVET_DECLARE_PLUGIN(DASP_1979_I132410);

} ```