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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/Beam.hh"
namespace Rivet {
/// @brief K0 and Lambda spectra at 14, 22 and 34 GeV.
class TASSO_1985_I205119 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(TASSO_1985_I205119);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(Beam(), "Beams");
declare(UnstableParticles(), "UFS");
// Book histograms
sqs = 1.;
if(isCompatibleWithSqrtS(14.)) {
book(_h_kaon_x , 1,1,1);
book(_h_lambda_x, 4,1,1);
book(_h_kaon_p , 7,1,1);
book(_h_lambda_p, 10,1,1);
sqs = 14.;
}
else if (isCompatibleWithSqrtS(22.)) {
book(_h_kaon_x , 2,1,1);
book(_h_lambda_x, 5,1,1);
book(_h_kaon_p , 8,1,1);
book(_h_lambda_p, 11,1,1);
sqs = 22.;
}
else if (isCompatibleWithSqrtS(34.)) {
book(_h_kaon_x , 3,1,1);
book(_h_lambda_x, 6,1,1);
book(_h_kaon_p , 9,1,1);
book(_h_lambda_p,12,1,1);
sqs = 34.;
}
else
MSG_WARNING("CoM energy of events sqrt(s) = " << sqrtS()/GeV
<< " doesn't match any available analysis energy .");
}
/// 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::abspid==PID::LAMBDA or Cuts::pid==130 or Cuts::pid==310)) {
double xE = p.E()/meanBeamMom;
double modp = p.p3().mod();
double beta = modp/p.E();
if(abs(p.pid())==PID::LAMBDA) {
_h_lambda_x->fill(xE,1./beta);
_h_lambda_p->fill(modp,1.);
}
else {
_h_kaon_x->fill(xE,1./beta);
_h_kaon_p->fill(modp,1.);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_kaon_x , sqr(sqs)*crossSection()/microbarn/sumOfWeights());
scale(_h_lambda_x, sqr(sqs)*crossSection()/microbarn/sumOfWeights());
scale(_h_kaon_p , crossSection()/nanobarn/sumOfWeights());
scale(_h_lambda_p, crossSection()/nanobarn/sumOfWeights());
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_kaon_x, _h_lambda_x, _h_kaon_p, _h_lambda_p;
double sqs;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(TASSO_1985_I205119);
}
|