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Rivet analyses reference
TASSO_1980_I153511
Event shapes at 12 and 30 GeV
Experiment: TASSO (Petra)
Inspire ID: 153511
Status: VALIDATED
Authors:
References:
- Phys.Lett. B94 (1980) 437-443, 1980
Beams: e- e+
Beam energies: (6.0, 6.0); (15.0, 15.0) GeV
Run details:
- $e^+e^-\to$ hadrons. Beam energy must be specified as analysis option "ENERGY" when rivet-merging samples.
Sphericity, Aplanarity and scaled momentum distribution at 12 and 30 GeV. Beam energy must be specified as analysis option "ENERGY" when rivet-merging samples.
Source code:
TASSO_1980_I153511.cc
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93 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Sphericity.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/Beam.hh"
namespace Rivet {
/// @brief Add a short analysis description here
class TASSO_1980_I153511 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(TASSO_1980_I153511);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
declare(Beam(), "Beams");
const ChargedFinalState cfs;
declare(cfs, "CFS");
// Thrust and sphericity
declare(Sphericity(cfs), "Sphericity");
// Book histograms
unsigned int ihist=0;
if (isCompatibleWithSqrtS(12.)) {
ihist=1;
}
else if (isCompatibleWithSqrtS(30.)) {
ihist=2;
}
else
MSG_ERROR("Beam energy " << sqrtS() << " GeV not supported!");
book(_h_S , ihist, 1, 1);
book(_h_A , 2+ihist, 1, 1);
book(_h_x , 4+ihist, 1, 1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Get beams and average beam momentum
const ParticlePair& beams = apply<Beam>(event, "Beams").beams();
const double meanBeamMom = ( beams.first.p3().mod() +
beams.second.p3().mod() ) / 2.0;
const ChargedFinalState& cfs = apply<ChargedFinalState>(event, "CFS");
const Sphericity& sphericity = apply<Sphericity>(event, "Sphericity");
_h_S->fill(sphericity.sphericity());
_h_A->fill(sphericity.aplanarity());
for (const Particle& p : cfs.particles()) {
const Vector3 mom3 = p.p3();
const double mom = mom3.mod();
const double xp = mom/meanBeamMom;
_h_x->fill(xp);
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h_S);
normalize(_h_A);
normalize(_h_x);
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_S,_h_A,_h_x;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(TASSO_1980_I153511);
}
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