Rivet analyses

title: TASSO_1984_I199468

Measurement of $R$ for energies between 39.8 and 45.2 GeV

Experiment: TASSO (PETRA)

Inspire ID: 199468

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Lett. B138 (1984) 441-448, 1984

Beams: e- e+

Beam energies: (19.9, 19.9); (19.9, 19.9); (19.9, 19.9); (19.9, 19.9); (20.0, 20.0); (20.0, 20.0); (20.0, 20.0); (20.0, 20.0); (20.0, 20.0); (20.0, 20.0); (20.0, 20.0); (20.1, 20.1); (20.1, 20.1); (20.1, 20.1); (20.1, 20.1); (20.1, 20.1); (20.1, 20.1); (20.1, 20.1); (20.2, 20.2); (20.2, 20.2); (20.2, 20.2); (20.2, 20.2); (20.2, 20.2); (20.2, 20.2); (20.3, 20.3); (20.3, 20.3); (20.3, 20.3); (20.3, 20.3); (20.3, 20.3); (20.3, 20.3); (20.3, 20.3); (20.4, 20.4); (20.4, 20.4); (20.4, 20.4); (20.4, 20.4); (20.4, 20.4); (20.4, 20.4); (20.4, 20.4); (20.5, 20.5); (20.5, 20.5); (20.5, 20.5); (20.5, 20.5); (20.5, 20.5); (20.5, 20.5); (20.6, 20.6); (20.6, 20.6); (20.6, 20.6); (20.6, 20.6); (20.6, 20.6); (20.6, 20.6); (20.6, 20.6); (20.7, 20.7); (20.7, 20.7); (20.7, 20.7); (20.7, 20.7); (20.7, 20.7); (20.7, 20.7); (20.8, 20.8); (20.8, 20.8); (20.8, 20.8); (20.8, 20.8); (20.8, 20.8); (20.8, 20.8); (20.8, 20.8); (20.9, 20.9); (20.9, 20.9); (20.9, 20.9); (20.9, 20.9); (20.9, 20.9); (20.9, 20.9); (20.9, 20.9); (21.0, 21.0); (21.0, 21.0); (21.0, 21.0); (21.0, 21.0); (21.0, 21.0); (21.0, 21.0); (21.1, 21.1); (21.1, 21.1); (21.1, 21.1); (21.1, 21.1); (21.1, 21.1); (21.1, 21.1); (21.1, 21.1); (21.2, 21.2); (21.2, 21.2); (21.2, 21.2); (21.2, 21.2); (21.2, 21.2); (21.2, 21.2); (21.2, 21.2); (21.3, 21.3); (21.3, 21.3); (21.3, 21.3); (21.3, 21.3); (21.3, 21.3); (21.3, 21.3); (21.4, 21.4); (21.4, 21.4); (21.4, 21.4); (21.4, 21.4); (21.4, 21.4); (21.4, 21.4); (21.4, 21.4); (21.5, 21.5); (21.5, 21.5); (21.5, 21.5); (21.5, 21.5); (21.5, 21.5); (21.5, 21.5); (21.5, 21.5); (21.6, 21.6); (21.6, 21.6); (21.6, 21.6); (21.6, 21.6); (21.6, 21.6); (21.6, 21.6); (21.6, 21.6); (21.7, 21.7); (21.7, 21.7); (21.7, 21.7); (21.7, 21.7); (21.7, 21.7); (21.7, 21.7); (21.8, 21.8); (21.8, 21.8); (21.8, 21.8); (21.8, 21.8); (21.8, 21.8); (21.8, 21.8); (21.8, 21.8); (21.9, 21.9); (21.9, 21.9); (21.9, 21.9); (21.9, 21.9); (21.9, 21.9); (21.9, 21.9); (21.9, 21.9); (22.0, 22.0); (22.0, 22.0); (22.0, 22.0); (22.0, 22.0); (22.0, 22.0); (22.0, 22.0); (22.1, 22.1); (22.1, 22.1); (22.1, 22.1); (22.1, 22.1); (22.1, 22.1); (22.1, 22.1); (22.1, 22.1); (22.2, 22.2); (22.2, 22.2); (22.2, 22.2); (22.2, 22.2); (22.2, 22.2); (22.2, 22.2); (22.2, 22.2); (22.3, 22.3); (22.3, 22.3); (22.3, 22.3); (22.3, 22.3); (22.3, 22.3); (22.3, 22.3); (22.4, 22.4); (22.4, 22.4); (22.4, 22.4); (22.4, 22.4); (22.4, 22.4); (22.4, 22.4); (22.4, 22.4); (22.5, 22.5); (22.5, 22.5); (22.5, 22.5); (22.5, 22.5); (22.5, 22.5); (22.5, 22.5); (22.6, 22.6); (22.6, 22.6); (22.6, 22.6); (22.6, 22.6); (22.6, 22.6)GeV

Run details: - e+ e- to hadrons and e+ e- to mu+ mu- (for normalization)

Measurement of $R$ in $e^+e^-$ collisions for energies between 39.8 and 45.2 GeV. The individual hadronic and muonic cross sections are also outputted to the yoda file so that ratio $R$ can be recalculated if runs are combined.

Source code:TASSO_1984_I199468.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/FinalState.hh"

namespace Rivet {

/// @brief Measurement of $R$ for energies between 39.8 and 45.2 GeV class TASSO_1984_I199468 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(TASSO_1984_I199468);


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

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

  // Book histograms
  book(_c_hadrons1, "/TMP/sigma_hadrons1", refData<YODA::BinnedEstimate<string>>(1, 1, 1));
  book(_c_muons1, "/TMP/sigma_muons1", refData<YODA::BinnedEstimate<string>>(1, 1, 1));
  book(_c_hadrons2, "/TMP/sigma_hadrons2", refData(2, 1, 1));
  book(_c_muons2, "/TMP/sigma_muons2", refData(2, 1, 1));
  for (const string& en : _c_hadrons1.binning().edges<0>()) {
    double eval = stod(en) * GeV;
    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;
  }
  if (nCount[-13] == 1 && nCount[13] == 1 && ntotal == 2 + nCount[22]) {
    // mu+mu- + photons
    _c_muons1->fill(_sqs);
    _c_muons2->fill(sqrtS() / GeV);
  }
  else {
    // everything else
    _c_hadrons1->fill(_sqs);
    _c_hadrons2->fill(sqrtS() / GeV);
  }
}

/// Normalise histograms etc., after the run
void finalize() {
  BinnedEstimatePtr<string> ratio1;
  book(ratio1, 1, 1, 1);
  divide(_c_hadrons1, _c_muons1, ratio1);
  Estimate1DPtr ratio2;
  book(ratio2, 2, 1, 1);
  divide(_c_hadrons2, _c_muons2, ratio2);
}
/// @}

/// @name Histograms
/// @{
BinnedHistoPtr<string> _c_hadrons1, _c_muons1;
Histo1DPtr _c_hadrons2, _c_muons2;
string _sqs = "";
/// @}

};

RIVET_DECLARE_PLUGIN(TASSO_1984_I199468); } ```