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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/Beam.hh"
namespace Rivet {
/// @brief pi0 spectrum at 14 and 34 GeV
class TASSO_1982_I168232 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(TASSO_1982_I168232);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
declare(Beam(), "Beams");
declare(UnstableParticles(), "UFS");
// Book histograms
sqs = 1.0;
if(isCompatibleWithSqrtS(14.)) {
book(_h_E, 2,1,1);
book(_h_p, 2,2,2);
book(_h_x, 2,3,3);
sqs = 14.0;
}
else if (isCompatibleWithSqrtS(34.)) {
book(_h_E, 3,1,1);
book(_h_p, 3,2,2);
book(_h_x, 3,3,3);
sqs = 34.0;
}
else
MSG_ERROR("Not compatible with energy " << sqrtS() << "GeV.");
}
/// 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 meanBeamMom = ( beams.first.p3().mod() +
beams.second.p3().mod() ) / 2.0;
MSG_DEBUG("Avg beam momentum = " << meanBeamMom);
for (const Particle& p : apply<UnstableParticles>(event, "UFS").particles(Cuts::pid==PID::PI0)) {
if(!p.parents().empty() && p.parents()[0].pid()==PID::K0S)
continue;
double xE = p.E()/meanBeamMom;
double beta = p.p3().mod()/p.E();
_h_E->fill(p.E() );
_h_p->fill(p.p3().mod());
_h_x->fill(xE,1./beta);
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_E, crossSection()/nanobarn/sumOfWeights());
scale(_h_p, crossSection()/nanobarn/sumOfWeights());
scale(_h_x, sqr(sqs)*crossSection()/microbarn/sumOfWeights());
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_E,_h_p,_h_x;
double sqs;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(TASSO_1982_I168232);
}
|