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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief OPAL f0,f2 and phi fragmentation function paper
///
/// @author Peter Richardson
class OPAL_1998_S3702294 : public Analysis {
public:
RIVET_DEFAULT_ANALYSIS_CTOR(OPAL_1998_S3702294);
/// @name Analysis methods
/// @{
void init() {
declare(Beam(), "Beams");
declare(ChargedFinalState(), "FS");
declare(UnstableParticles(), "UFS");
book(_histXpf0 , 2, 1, 1);
book(_histXpf2 , 2, 1, 2);
book(_histXpPhi , 2, 1, 3);
}
void analyze(const Event& e) {
// First, veto on leptonic events by requiring at least 4 charged FS particles
const FinalState& fs = apply<FinalState>(e, "FS");
const size_t numParticles = fs.particles().size();
// Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
if (numParticles < 2) {
MSG_DEBUG("Failed leptonic event cut");
vetoEvent;
}
MSG_DEBUG("Passed leptonic event cut");
// Get beams and average beam momentum
const ParticlePair& beams = apply<Beam>(e, "Beams").beams();
const double meanBeamMom = ( beams.first.p3().mod() +
beams.second.p3().mod() ) / 2.0;
MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
// Final state of unstable particles to get particle spectra
const UnstableParticles& ufs = apply<UnstableParticles>(e, "UFS");
for (const Particle& p : ufs.particles()) {
const int id = p.abspid();
double xp = p.p3().mod()/meanBeamMom;
switch (id) {
case 9010221:
_histXpf0->fill(xp);
break;
case 225:
_histXpf2->fill(xp);
break;
case 333:
_histXpPhi->fill(xp);
break;
}
}
}
/// Finalize
void finalize() {
scale(_histXpf0 , 1./sumOfWeights());
scale(_histXpf2 , 1./sumOfWeights());
scale(_histXpPhi, 1./sumOfWeights());
}
/// @}
private:
/// @{
Histo1DPtr _histXpf0;
Histo1DPtr _histXpf2;
Histo1DPtr _histXpPhi;
/// @}
};
RIVET_DECLARE_ALIASED_PLUGIN(OPAL_1998_S3702294, OPAL_1998_I467092);
}
|