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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief phi and D_s spectra at 29 GeV
class HRS_1985_I213242 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(HRS_1985_I213242);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
declare(UnstableParticles(), "UFS");
book(_h_phi,1,1,1);
book(_h_Ds ,2,1,1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
UnstableParticles ufs = apply<UnstableParticles>(event,"UFS");
for(const Particle & p : ufs.particles(Cuts::abspid==431 ||
Cuts::pid==333)) {
double xE = 2.*p.E()/sqrtS();
Vector3 mom3 = p.p3();
const double energy = p.E();
double modp = mom3.mod();
double beta = modp/energy;
if(p.pid()==333)
_h_phi->fill(xE,1./beta);
else
_h_Ds ->fill(xE,1./beta);
}
}
/// Normalise histograms etc., after the run
void finalize() {
// PDG 2020 D_s phi pi br
double br=0.045;
scale( _h_phi, sqr(sqrtS())*crossSection()/nanobarn/sumOfWeights());
scale( _h_Ds , br*sqr(sqrtS())*crossSection()/nanobarn/sumOfWeights());
}
///@}
/// @name Histograms
///@{
Histo1DPtr _h_phi,_h_Ds;
///@}
};
RIVET_DECLARE_PLUGIN(HRS_1985_I213242);
}
|