Rivet analyses

title: CLEO_2006_I1650066

Hadronic cross section at 3.773 GeV

Experiment: CLEO (CESR)

Inspire ID: 1650066

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Rev.Lett. 96 (2006) 092002, 2006

Beams: e- e+

Beam energies: (1.9, 1.9)GeV

Run details: - e+ e- to hadrons

Haronic cross section at 3.773 measured by CLEO.

Source code:CLEO_2006_I1650066.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/FinalState.hh"

namespace Rivet {

/// @brief Hadronic cross section at 3.773 class CLEO_2006_I1650066 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEO_2006_I1650066);


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

/// Book histograms and initialise projections before the run
void init() {
  declare(FinalState(), "FS");
  book(_c_hadrons, 1, 1, 1);
  for (const string& en : _c_hadrons.binning().edges<0>()) {
    double eval = stod(en);
    if (isCompatibleWithSqrtS(eval)) {
      _sqs = en;
      break;
    }
  }
  raiseBeamErrorIf(_sqs.empty());
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  const FinalState& fs = apply<FinalState>(event, "FS");

  map<long, int> nCount;
  int ntotal(0);
  for (const Particle& p : fs.particles()) {
    nCount[p.pid()] += 1;
    ++ntotal;
  }
  // mu+mu- + photons
  if (nCount[-13] == 1 and nCount[13] == 1 && ntotal == 2 + nCount[22])
    vetoEvent;
  else { // everything else
    _c_hadrons->fill(_sqs);
  }
}


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

/// @}


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

};

RIVET_DECLARE_PLUGIN(CLEO_2006_I1650066);

} ```