Rivet analyses

title: TASSO_1989_I279165

Jet masses in $e^+e^-$ between 14 and 44 GeV

Experiment: TASSO (Petra)

Inspire ID: 279165

Status: VALIDATED

Authors: - Peter Richardson

References: - Z.Phys. C45 (1989) 11

Beams: e- e+

Beam energies: (7.0, 7.0); (11.0, 11.0); (17.4, 17.4); (21.8, 21.8)GeV

Run details: - $e^+ e^- \to$ hadrons.

Light, heavy jet masses and their difference at 14, 22, 34.8, and 43.5 measured by the TASSO experiment.

Source code:TASSO_1989_I279165.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/Beam.hh"

include "Rivet/Projections/ChargedFinalState.hh"

include "Rivet/Projections/Hemispheres.hh"

include "Rivet/Projections/Thrust.hh"

namespace Rivet {

/// @brief jet masses for 14, 22, 34.8 and 43,5 GeV class TASSO_1989_I279165 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(TASSO_1989_I279165);


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

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

  const ChargedFinalState cfs;
  declare(cfs, "CFS");
  declare(Hemispheres(Thrust(cfs)), "Hemispheres");

  size_t ih = 0;
  for (double eVal : allowedEnergies()) {
    const string en = toString(round(eVal / MeV));
    if (isCompatibleWithSqrtS(eVal)) _sqs = en;
    book(_h[en + "diff"], 1, 1, ++ih);
    book(_h[en + "heavy"], 2, 1, ih);
    book(_h[en + "light"], 3, 1, ih);
  }
  raiseBeamErrorIf(_sqs.empty());
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  const ChargedFinalState& cfs = apply<ChargedFinalState>(event, "CFS");

  if (cfs.particles().size() < 3) vetoEvent;

  const Hemispheres& hemi = apply<Hemispheres>(event, "Hemispheres");
  _h[_sqs + "heavy"]->fill(hemi.scaledM2high());
  _h[_sqs + "light"]->fill(hemi.scaledM2low());
  _h[_sqs + "diff"]->fill(hemi.scaledM2diff());
}


/// Normalise histograms etc., after the run
void finalize() {
  normalize(_h);
}
/// @}


/// @name Histograms
/// @{
map<string, Histo1DPtr> _h;
string _sqs = "";
/// @}

};

RIVET_DECLARE_PLUGIN(TASSO_1989_I279165); } ```