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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/Beam.hh"
namespace Rivet {
/// @brief Add a short analysis description here
class DELPHI_2000_I524694 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(DELPHI_2000_I524694);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
declare(Beam(), "Beams");
declare(UnstableParticles(), "UFS");
book(_histXpSigma, 1, 1, 1);
book(_histXpLambda, 3, 1, 1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Get event weight for histo filling
// 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;
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
for (const Particle& p : ufs.particles()) {
const int id = p.abspid();
double xp = p.p3().mod()/meanBeamMom;
switch (id) {
case 3112:
_histXpSigma->fill(xp);
break;
case 3124:
_histXpLambda->fill(xp);
break;
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
double fact = 1./sumOfWeights();
scale(_histXpSigma , fact);
scale(_histXpLambda, fact);
}
//@}
/// @name Histograms
//@{
Histo1DPtr _histXpSigma;
Histo1DPtr _histXpLambda;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(DELPHI_2000_I524694);
}
|