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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#define I_KNOW_THE_INITIAL_QUARKS_PROJECTION_IS_DODGY_BUT_NEED_TO_USE_IT
#include "Rivet/Projections/InitialQuarks.hh"
namespace Rivet {
/// @brief charged particle spectra
class DELPHI_1997_I428178 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(DELPHI_1997_I428178);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
declare(Beam(), "Beams");
declare(ChargedFinalState(), "FS");
declare(InitialQuarks(), "IQF");
// Book histograms
book(_h_bottom, 1, 1, 1);
book(_h_charm , 1, 1, 2);
book(_h_light , 1, 1, 3);
book(_wBottom,"TMP/wBottom");
book(_wCharm ,"TMP/wCharm" );
book(_wLight ,"TMP/wLight" );
}
/// 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");
const size_t numParticles = fs.particles().size();
// Even if we only generate hadronic events, we still need a cut on numCharged >= 2.
if (numParticles < 2) {
MSG_DEBUG("Failed leptonic event cut");
vetoEvent;
}
MSG_DEBUG("Passed leptonic event cut");
int flavour = 0;
const InitialQuarks& iqf = apply<InitialQuarks>(event, "IQF");
// If we only have two quarks (qqbar), just take the flavour.
// If we have more than two quarks, look for the highest energetic q-qbar pair.
if (iqf.particles().size() == 2) {
flavour = iqf.particles().front().abspid();
}
else {
map<int, double> quarkmap;
for (const Particle& p : iqf.particles()) {
if (quarkmap[p.pid()] < p.E()) {
quarkmap[p.pid()] = p.E();
}
}
double maxenergy = 0.;
for (int i = 1; i <= 5; ++i) {
if (quarkmap[i]+quarkmap[-i] > maxenergy) {
flavour = i;
}
}
}
if (flavour==5) _wBottom->fill();
else if(flavour==4) _wCharm ->fill();
else _wLight ->fill();
// 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 : fs.particles()) {
double xp = p.p3().mod()/meanBeamMom;
if (flavour==5) _h_bottom->fill(xp);
else if(flavour==4) _h_charm ->fill(xp);
else _h_light ->fill(xp);
}
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_h_bottom, 1./ *_wBottom);
scale(_h_charm , 1./ *_wCharm);
scale(_h_light , 1./ *_wLight);
}
//@}
/// @name Histograms
//@{
Histo1DPtr _h_bottom, _h_charm, _h_light;
CounterPtr _wBottom, _wCharm, _wLight;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(DELPHI_1997_I428178);
}
|