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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/Beam.hh"
namespace Rivet {
/// @brief rho0 and K*+/- spectra at 35 GeV
class JADE_1984_I203145 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(JADE_1984_I203145);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(Beam(), "Beams");
declare(UnstableParticles(), "UFS");
// Book histograms
book(_h_rho , 2, 1, 1);
book(_h_kstar, 3, 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;
MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
for (const Particle& p : apply<UnstableParticles>(event, "UFS").
particles(Cuts::abspid==323 or Cuts::pid==113)) {
double xE = p.E()/meanBeamMom;
double modp = p.p3().mod();
double beta = modp/p.E();
if(p.pid()==113) {
_h_rho->fill(xE,1./beta);
}
else {
_h_kstar->fill(xE,1./beta);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_rho , sqr(sqrtS())*crossSection()/nanobarn/sumOfWeights());
scale(_h_kstar, sqr(sqrtS())*crossSection()/nanobarn/sumOfWeights());
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_rho, _h_kstar;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(JADE_1984_I203145);
}
|