Rivet analyses

title: DM1_1981_I166353

Cross section for $e^+e^-\to 3\pi^+3\pi^-$ between 1.4 and 2.11 GeV

Experiment: DM1 (DCI)

Inspire ID: 166353

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Rev. D73.052003

Beams: e+ e-

Beam energies: ANY

Run details: - e+ e- to hadrons

Cross section for $e^+e^-\to3\pi^+3\pi^-$ between 1.4 and 2.18 GeV

Source code:DM1_1981_I166353.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/FinalState.hh"

namespace Rivet {

/// @brief e+e- > 3pi+3pi- class DM1_1981_I166353 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(DM1_1981_I166353);


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

/// Book histograms and initialise projections before the run
void init() {
  // Initialise and register projections
  declare(FinalState(), "FS");
  book(_num3pip3pim, "TMP/num3pip3pim", refData(1, 1, 1));
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  const FinalState& fs = apply<FinalState>(event, "FS");
  int ntotal(0);
  for (const Particle& p : fs.particles()) {
    if (abs(p.pid()) != 211) vetoEvent;
    ++ntotal;
  }
  if (ntotal != 6) vetoEvent;
  _num3pip3pim->fill(sqrtS() / GeV);
}


/// Normalise histograms etc., after the run
void finalize() {
  scale(_num3pip3pim, crossSection() / sumOfWeights() / nanobarn);
  Estimate1DPtr mult;
  book(mult, 1, 1, 1);
  barchart(_num3pip3pim, mult);
}
/// @}

/// @name Histograms
/// @{
Histo1DPtr _num3pip3pim;
/// @}

};

RIVET_DECLARE_PLUGIN(DM1_1981_I166353);

} ```