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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 DELPHI strange baryon paper
///
/// @author Hendrik Hoeth
class DELPHI_1995_S3137023 : public Analysis {
public:
RIVET_DEFAULT_ANALYSIS_CTOR(DELPHI_1995_S3137023);
/// @name Analysis methods
/// @{
void init() {
declare(Beam(), "Beams");
declare(ChargedFinalState(), "FS");
declare(UnstableParticles(), "UFS");
book(_histXpXiMinus ,2, 1, 1);
book(_histXpSigma1385Plus ,3, 1, 1);
book(_weightedTotalNumXiMinus, "_weightedTotalNumXiMinus");
book(_weightedTotalNumSigma1385Plus, "_weightedTotalNumSigma1385Plus");
}
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();
switch (id) {
case 3312:
_histXpXiMinus->fill(p.p3().mod()/meanBeamMom);
_weightedTotalNumXiMinus->fill();
break;
case 3114: case 3224:
_histXpSigma1385Plus->fill(p.p3().mod()/meanBeamMom);
_weightedTotalNumSigma1385Plus->fill();
break;
}
}
}
/// Finalize
void finalize() {
normalize(_histXpXiMinus , dbl(*_weightedTotalNumXiMinus)/sumOfWeights());
normalize(_histXpSigma1385Plus , dbl(*_weightedTotalNumSigma1385Plus)/sumOfWeights());
}
/// @}
private:
/// Store the weighted sums of numbers of charged / charged+neutral
/// particles - used to calculate average number of particles for the
/// inclusive single particle distributions' normalisations.
CounterPtr _weightedTotalNumXiMinus;
CounterPtr _weightedTotalNumSigma1385Plus;
Histo1DPtr _histXpXiMinus;
Histo1DPtr _histXpSigma1385Plus;
};
RIVET_DECLARE_ALIASED_PLUGIN(DELPHI_1995_S3137023, DELPHI_1995_I394716);
}
|