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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
namespace Rivet {
/// @brief EEC at 29 GeV
class MAC_1985_I202924 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(MAC_1985_I202924);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(FinalState(), "FS");
book(_histEEC , 1, 1, 1);
book(_histEEC_Pi, 1, 1, 2);
book(_histAEEC , 1, 1, 3);
book(_weightSum,"TMP/weightSum");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// First, veto on leptonic events by requiring at least 4 charged FS particles
const FinalState& fs = apply<FinalState>(event, "FS");
// Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
if ( fs.particles().size() < 2) {
MSG_DEBUG("Failed leptonic event cut");
vetoEvent;
}
MSG_DEBUG("Passed leptonic event cut");
_weightSum->fill();
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 = mom3_i.unit().angle(mom3_j.unit())/M_PI*180.;
double eec = (energy_i*energy_j) / Evis2;
if(p_i != p_j) eec *= 2.;
if (thetaij < 90.) {
_histEEC ->fill(thetaij, eec);
_histAEEC->fill(thetaij, -eec);
}
else {
_histEEC_Pi->fill(180.-thetaij, eec);
_histAEEC ->fill(180.-thetaij, eec);
}
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_histEEC , 180.0/M_PI*1000./ *_weightSum);
scale(_histEEC_Pi, 180.0/M_PI*1000./ *_weightSum);
scale(_histAEEC , 180.0/M_PI*1000./ *_weightSum);
}
//@}
/// @name Histograms
//@{
Histo1DPtr _histEEC, _histEEC_Pi, _histAEEC;
CounterPtr _weightSum;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(MAC_1985_I202924);
}
|