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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief Spectrum for D_s2+
class ARGUS_1995_I397794 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1995_I397794);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
// projections
declare(Beam(), "Beams");
declare(UnstableParticles(), "UFS");
// book histos
book(_h_rate1,1,1,1);
book(_h_rate2,1,2,1);
book(_h_x,2,1,1);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
static const int idDs2 = 435;
// 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(2.625));
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
for (const Particle& p : ufs.particles(Cuts::abspid==idDs2)) {
double xp = p.momentum().p3().mod()/Pmax;
_h_x->fill(xp);
int sign = p.pid()/p.abspid();
if(p.children().size()!=2) continue;
if(p.children()[0].pid()==sign*421 &&
p.children()[1].pid()==sign*321) {
_h_rate1->fill(xp);
_h_rate2->fill(xp);
}
else if(p.children()[1].pid()==sign*421 &&
p.children()[0].pid()==sign*321) {
_h_rate1->fill(xp);
_h_rate2->fill(xp);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h_x);
scale(_h_rate1,0.3*crossSection()/sumOfWeights()/picobarn);
scale(_h_rate2,crossSection()/sumOfWeights()/picobarn);
}
///@}
/// @name Histograms
///@{
Histo1DPtr _h_x,_h_rate1,_h_rate2;
///@}
};
RIVET_DECLARE_PLUGIN(ARGUS_1995_I397794);
}
|