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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Add a short analysis description here
class TOPAZ_1995_I381900 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(TOPAZ_1995_I381900);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(Beam(), "Beams");
declare(UnstableParticles(), "UFS");
const ChargedFinalState cfs;
declare(cfs, "CFS");
// Book histograms
book(_h_charged,1, 1, 1);
book(_h_pi ,2, 1, 1);
book(_h_Kp ,2, 1, 2);
book(_h_proton ,2, 1, 3);
book(_h_K0 ,3, 1, 1);
book(_wSum,"TMP/wSum");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const ChargedFinalState& cfs = apply<ChargedFinalState>(event, "CFS");
int nch = cfs.particles().size();
if(nch<5) vetoEvent;
// 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;
MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
_wSum->fill();
// neutral kaons
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
for(const Particle & p : ufs.particles(Cuts::pid==130 || Cuts::pid==310)) {
double xi = -log(p.p3().mod()/meanBeamMom);
_h_K0->fill(xi);
}
// charged particles
for(const Particle & p : cfs.particles()) {
double xi = -log(p.p3().mod()/meanBeamMom);
_h_charged->fill(xi);
int id = abs(p.pid());
if(id==211)
_h_pi->fill(xi);
else if(id==321)
_h_Kp->fill(xi);
else if(id==2212)
_h_proton->fill(xi);
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_charged,1./ *_wSum);
scale(_h_pi ,1./ *_wSum);
scale(_h_Kp ,1./ *_wSum);
scale(_h_proton ,1./ *_wSum);
scale(_h_K0 ,1./ *_wSum);
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_charged,_h_pi,_h_Kp,_h_proton,_h_K0;
CounterPtr _wSum;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(TOPAZ_1995_I381900);
}
|