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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 strange baryon paper
///
/// @author Peter Richardson
class OPAL_1997_S3396100 : public Analysis {
public:
RIVET_DEFAULT_ANALYSIS_CTOR(OPAL_1997_S3396100);
/// @name Analysis methods
/// @{
void init() {
declare(Beam(), "Beams");
declare(ChargedFinalState(), "FS");
declare(UnstableParticles(), "UFS");
book(_histXpLambda , 1, 1, 1);
book(_histXiLambda , 2, 1, 1);
book(_histXpXiMinus , 3, 1, 1);
book(_histXiXiMinus , 4, 1, 1);
book(_histXpSigma1385Plus , 5, 1, 1);
book(_histXiSigma1385Plus , 6, 1, 1);
book(_histXpSigma1385Minus , 7, 1, 1);
book(_histXiSigma1385Minus , 8, 1, 1);
book(_histXpXi1530 , 9, 1, 1);
book(_histXiXi1530 ,10, 1, 1);
book(_histXpLambda1520 ,11, 1, 1);
book(_histXiLambda1520 ,12, 1, 1);
}
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();
if (!inRange(id, 3000, 3999)) continue;
const double xE = p.E()/meanBeamMom;
const double xp = p.p3().mod()/(2*meanBeamMom);
const double xi = -log(xp);
switch (id) {
case 3312:
_histXpXiMinus->fill(xE);
_histXiXiMinus->fill(xi);
break;
case 3224:
_histXpSigma1385Plus->fill(xE);
_histXiSigma1385Plus->fill(xi);
break;
case 3114:
_histXpSigma1385Minus->fill(xE);
_histXiSigma1385Minus->fill(xi);
break;
case 3122:
_histXpLambda->fill(xE);
_histXiLambda->fill(xi);
break;
case 3324:
_histXpXi1530->fill(xE);
_histXiXi1530->fill(xi);
break;
case 3124:
_histXpLambda1520->fill(xE);
_histXiLambda1520->fill(xi);
break;
}
}
}
/// Finalize
void finalize() {
double fact=1./sumOfWeights();
scale(_histXpLambda , fact);
scale(_histXiLambda , fact);
scale(_histXpXiMinus , fact);
scale(_histXiXiMinus , fact);
scale(_histXpSigma1385Plus , fact);
scale(_histXiSigma1385Plus , fact);
scale(_histXpSigma1385Minus, fact);
scale(_histXiSigma1385Minus, fact);
scale(_histXpXi1530 , fact);
scale(_histXiXi1530 , fact);
scale(_histXpLambda1520 , fact);
scale(_histXiLambda1520 , fact);
}
/// @}
private:
/// @name Histograms
/// @{
Histo1DPtr _histXpLambda;
Histo1DPtr _histXiLambda;
Histo1DPtr _histXpXiMinus;
Histo1DPtr _histXiXiMinus;
Histo1DPtr _histXpSigma1385Plus;
Histo1DPtr _histXiSigma1385Plus;
Histo1DPtr _histXpSigma1385Minus;
Histo1DPtr _histXiSigma1385Minus;
Histo1DPtr _histXpXi1530;
Histo1DPtr _histXiXi1530;
Histo1DPtr _histXpLambda1520;
Histo1DPtr _histXiLambda1520;
/// @}
};
RIVET_DECLARE_ALIASED_PLUGIN(OPAL_1997_S3396100, OPAL_1997_I421978);
}
|