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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/FinalState.hh"
namespace Rivet {
/// @brief EEC at 29 GeV
class MARKII_1988_I250899 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(MARKII_1988_I250899);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(FinalState(), "FS");
for(unsigned int ix=0;ix<3;++ix) {
book(_h_EEC [ix],2*ix+1,1,1);
book(_h_AEEC[ix],2*ix+2,1,1);
}
book(_weightSum, "TMP/weightSum");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const FinalState& fs = apply<FinalState>(event, "FS");
if ( fs.particles().size() < 2) vetoEvent;
_weightSum->fill();
// visible energy
double Evis = 0.0;
for (const Particle& p : fs.particles()) {
Evis += p.E();
}
double Evis2 = sqr(Evis);
// (A)EEC
// Need iterators since second loop starts at current outer loop iterator, i.e. no "foreach" here!
for (Particles::const_iterator p_i = fs.particles().begin(); p_i != fs.particles().end(); ++p_i) {
for (Particles::const_iterator p_j = p_i; p_j != fs.particles().end(); ++p_j) {
const Vector3 mom3_i = p_i->momentum().p3();
const Vector3 mom3_j = p_j->momentum().p3();
const double energy_i = p_i->momentum().E();
const double energy_j = p_j->momentum().E();
const double thetaij = 180.*mom3_i.unit().angle(mom3_j.unit())/M_PI;
double eec = (energy_i*energy_j) / Evis2;
if(p_i != p_j) eec *= 2.;
for(unsigned int ix=0;ix<3;++ix) _h_EEC[ix]->fill(thetaij, eec);
if (thetaij <90.)
for(unsigned int ix=0;ix<3;++ix) _h_AEEC[ix]->fill( thetaij, -eec);
else
for(unsigned int ix=0;ix<3;++ix) _h_AEEC[ix]->fill( 180.-thetaij, eec);
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<3;++ix) {
// factor due angle in degress not radians
scale(_h_EEC [ix], 180.0/M_PI/ *_weightSum);
scale(_h_AEEC[ix], 180.0/M_PI/ *_weightSum);
}
}
///@}
/// @name Histograms
///@{
Histo1DPtr _h_EEC[3],_h_AEEC[3];
CounterPtr _weightSum;
///@}
};
RIVET_DECLARE_PLUGIN(MARKII_1988_I250899);
}
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