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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/FastJets.hh"
#include "Rivet/Projections/Thrust.hh"
#include "Rivet/Projections/Beam.hh"
namespace Rivet {
/// @brief Add a short analysis description here
class TPC_1984_I200105 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(TPC_1984_I200105);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
declare(Beam(), "Beams");
const FinalState cfs(Cuts::charge != 0);
declare(cfs, "FS");
const Thrust thrust(cfs);
declare(thrust, "Thrust");
declare(UnstableParticles(), "UFS");
// Book histograms
book(_h_x , 1, 1, 1);
book(_h_pt, 3, 1, 1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// require 5 charged particles
const FinalState& fs = apply<FinalState>(event, "FS");
if(fs.size()<3) vetoEvent;
// 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);
// calc thrust
const Thrust& thrust = apply<Thrust>(event, "Thrust");
Vector3 axis = thrust.thrustAxis();
// Final state of unstable particles to get particle spectra
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
for (const Particle& p : ufs.particles(Cuts::pid==333)) {
double xE = p.E()/meanBeamMom;
double pT2 = p.p3().mod2()-sqr(axis.dot(p.p3()));
_h_x ->fill(xE );
_h_pt->fill(pT2);
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_x, 1./sumOfWeights());
scale(_h_pt, 1./sumOfWeights());
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_x,_h_pt;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(TPC_1984_I200105);
}
|