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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Kaon spectra at 3.63, 4.03 and 4.5 GeV
class PLUTO_1977_I118873 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(PLUTO_1977_I118873);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
declare(Beam(), "Beams");
declare(UnstableParticles(), "UFS");
if (isCompatibleWithSqrtS(3.63)) {
book(_h_spectrum, 2, 1, 1);
}
else if (isCompatibleWithSqrtS(4.03)) {
book(_h_spectrum, 3, 1, 1);
}
else if (isCompatibleWithSqrtS(4.5)) {
book(_h_spectrum, 4, 1, 1);
}
else
MSG_ERROR("Beam energy not supported!");
}
/// 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;
MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
// unstable particles
for (const Particle& p : apply<UnstableParticles>(event, "UFS").
particles(Cuts::pid==PID::K0S)) {
double xp = p.E()/meanBeamMom;
double beta = p.p3().mod()/p.E();
_h_spectrum->fill(xp,1./beta);
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_spectrum, sqr(sqrtS())*crossSection()/nanobarn/sumOfWeights());
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_spectrum;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(PLUTO_1977_I118873);
}
|