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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Sphericity.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/Beam.hh"
namespace Rivet {
/// @brief pi0 spectrum
class ALEPH_1997_I427131 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ALEPH_1997_I427131);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// // Initialise and register projections
declare(Beam(), "Beams");
const FinalState fs;
declare(fs, "FS");
declare(Sphericity(fs), "Sphericity");
declare(UnstableParticles(), "UFS");
// Book histograms
book(_h_x , 2, 1, 2);
book(_h_in , 4, 1, 1);
book(_h_out, 3, 1, 1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const FinalState& fs = apply<FinalState>(event, "FS");
if (fs.particles().size() < 2) {
MSG_DEBUG("Failed ncharged cut");
vetoEvent;
}
MSG_DEBUG("Passed ncharged cut");
const Sphericity& sphericity = apply<Sphericity>(event, "Sphericity");
// 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;
MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
for (const Particle& p : apply<UnstableParticles>(event, "UFS").particles(Cuts::pid==111) ) {
const Vector3 mom3 = p.p3();
const double pTinS = abs(dot(mom3, sphericity.sphericityMajorAxis()));
const double pToutS = abs(dot(mom3, sphericity.sphericityMinorAxis()));
_h_x ->fill(mom3.mod()/meanBeamMom);
_h_in ->fill(pTinS );
_h_out->fill(pToutS );
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_x , 1./sumOfWeights());
scale(_h_in , 1./sumOfWeights());
scale(_h_out, 1./sumOfWeights());
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_x, _h_in, _h_out;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(ALEPH_1997_I427131);
}
|