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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/Beam.hh"
namespace Rivet {
/// @brief D*+ production at 34.4 GeV
class JADE_1984_I202785 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(JADE_1984_I202785);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
declare(Beam(), "Beams");
declare(UnstableParticles(), "UFS");
// Book histograms
book(_h_x , 1, 1, 1);
book(_h_theta, 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);
Vector3 axis = beams.first.pid() == PID::EMINUS ?
beams.first.p3().unit() : beams.second.p3().unit();
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
for (const Particle& p : ufs.particles(Cuts::abspid==413)) {
double modp = p.p3().mod();
double xE =p.E()/meanBeamMom;
_h_x->fill(xE);
if(xE>0.4&&p.pid()>0) {
_h_theta->fill(p.p3().dot(axis)/modp);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h_theta,33.6,false); // normalize to data
scale(_h_x, crossSection()/microbarn/sumOfWeights()*sqr(sqrtS()));
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_x, _h_theta;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(JADE_1984_I202785);
}
|