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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 Charm meson spectra at 29 GeV
class HRS_1988_I23360 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(HRS_1988_I23360);
/// @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_Dstar1,1,1,1);
book(_h_Dstar2,1,1,2);
book(_h_D0 ,2,1,1);
book(_h_Dp ,2,1,2);
}
/// 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);
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
for(const Particle & p : ufs.particles(Cuts::abspid==413 || Cuts::abspid==421 || Cuts::abspid==411 )) {
double xE = p.E()/meanBeamMom;
int id = abs(p.pid());
if(id==413) {
_h_Dstar1->fill(xE);
_h_Dstar2->fill(xE);
}
else if(id==421) {
_h_D0->fill(xE);
}
else if(id==411) {
_h_Dp->fill(xE);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
double fact = sqr(sqrtS())*crossSection()/sumOfWeights()/microbarn;
scale(_h_Dstar1, fact);
normalize(_h_Dstar2);
scale(_h_D0,fact);
scale(_h_Dp,fact);
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_Dstar1,_h_Dstar2,_h_D0,_h_Dp;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(HRS_1988_I23360);
}
|