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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Lambda_c spectra
class CLEO_1990_I298611 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CLEO_1990_I298611);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
// projections
declare(Beam(), "Beams");
declare(UnstableParticles(), "UFS");
// histograms
for(unsigned int ix=0;ix<6;++ix) {
_h_x.push_back(Histo1DPtr());
book(_h_x[ix],ix+1,1,1);
}
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Get beams and average beam momentum
const ParticlePair& beams = apply<Beam>(event, "Beams").beams();
const double Emax = ( beams.first.p3().mod() + beams.second.p3().mod() ) / 2.0;
const double Pmax = sqrt(sqr(Emax)-sqr(2.28646));
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
for (const Particle& p : ufs.particles(Cuts::abspid==4122)) {
double xp = p.momentum().p3().mod()/Pmax;
for(unsigned int ix=0;ix<6;++ix)
_h_x[ix]->fill(xp);
}
}
/// Normalise histograms etc., after the run
void finalize() {
// branching ratios for the different modes used in the measurements
double br[6]={0.0623,2.*0.0158,2.*0.0159,
0.0129,0.0361 ,0.0062};
for(unsigned int ix=0;ix<6;++ix)
scale(_h_x[ix],crossSection()*br[ix]/picobarn/sumOfWeights());
}
///@}
/// @name Histograms
///@{
vector<Histo1DPtr> _h_x;
///@}
};
RIVET_DECLARE_PLUGIN(CLEO_1990_I298611);
}
|