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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
namespace Rivet {
/// @brief OPAL charged particle fragmentation functions
///
/// @author Peter Richardson
class OPAL_1994_S2927284 : public Analysis {
public:
RIVET_DEFAULT_ANALYSIS_CTOR(OPAL_1994_S2927284);
/// @name Analysis methods
/// @{
void analyze(const Event& e) {
// Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
const FinalState& fs = apply<FinalState>(e, "FS");
if (fs.particles().size() < 2) {
MSG_DEBUG("Failed ncharged cut");
vetoEvent;
}
MSG_DEBUG("Passed ncharged 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);
for (const Particle& p : fs.particles()) {
int id = p.abspid();
// charged pions
if (id == PID::PIPLUS) {
_histXpPiPlus->fill(p.p3().mod());
} else if(id == PID::KPLUS) {
_histXpKPlus->fill(p.p3().mod());
} else if(id == PID::PROTON) {
_histXpProton->fill(p.p3().mod());
}
}
}
void init() {
// Projections
declare(Beam(), "Beams");
declare(ChargedFinalState(), "FS");
book(_histXpPiPlus , 1, 1, 1);
book(_histXpKPlus , 2, 1, 1);
book(_histXpProton , 3, 1, 1);
}
/// Finalize
void finalize() {
scale(_histXpPiPlus,1./sumOfWeights());
scale(_histXpKPlus ,1./sumOfWeights());
scale(_histXpProton,1./sumOfWeights());
}
/// @}
private:
Histo1DPtr _histXpPiPlus;
Histo1DPtr _histXpKPlus;
Histo1DPtr _histXpProton;
};
RIVET_DECLARE_ALIASED_PLUGIN(OPAL_1994_S2927284, OPAL_1994_I372772);
}
|