Rivet analyses

title: ARGUS_1988_I260828

Cross section for $\gamma\gamma\to K^+K^-\pi^+\pi^-\pi^0$ $\sqrt{s}=2\to3.6\,$GeV

Experiment: ARGUS (DORIS)

Inspire ID: 260828

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Lett.B 210 (1988) 273-277

Beams: 22 22

Beam energies: ANY

Run details: - gamma gamma -> hadrons

Measurement of the cross section for $\gamma\gamma\to K^+K^-\pi^+\pi^-\pi^0$ with $\sqrt{s}=2\to3.6\,$GeV.

Source code:ARGUS_1988_I260828.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/FinalState.hh"

namespace Rivet {

/// @brief gamma gamma -> K+ K- pi+ pi- class ARGUS_1988_I260828 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1988_I260828);


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

/// Book histograms and initialise projections before the run
void init() {
  // Initialise and register projections
  declare(FinalState(), "FS");
  // histos
  book(_h, 1, 1, 1);

  for (const string& edge : _h.binning().edges<0>()) {
    if (isCompatibleWithSqrtS(stod(edge) * GeV)) {
      _sqs = edge;
    }
  }
  raiseBeamErrorIf(_sqs.empty());
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  const FinalState& fs = apply<FinalState>(event, "FS");
  // find the final-state particles
  map<long, int> nCount;
  int ntotal(0);
  for (const Particle& p : fs.particles()) {
    nCount[p.pid()] += 1;
    ++ntotal;
  }
  if (ntotal == 5 && nCount[211] == 1 && nCount[-211] == 1 && nCount[321] == 1 && nCount[-321] == 1
      && nCount[111] == 1)
    _h->fill(_sqs);
}


/// Normalise histograms etc., after the run
void finalize() {
  scale(_h, crossSection() / nanobarn / sumOfWeights());
}

/// @}


/// @name Histograms
/// @{
BinnedHistoPtr<string> _h;
string _sqs = "";
/// @}

};

RIVET_DECLARE_PLUGIN(ARGUS_1988_I260828);

} ```