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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/TriggerUA5.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
namespace Rivet {
/// UA5 charged multiplicity measurements at 546 GeV
class UA5_1987_S1640666 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(UA5_1987_S1640666);
/// Book histograms and initialise projections before the run
void init() {
declare(TriggerUA5(), "Trigger");
declare(ChargedFinalState((Cuts::etaIn(-5.0, 5.0))), "CFS");
book(_hist_mean_nch ,1, 1, 1);
book(_hist_nch ,3, 1, 1);
book(_sumWPassed, "SumW");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// Trigger
const TriggerUA5& trigger = apply<TriggerUA5>(event, "Trigger");
if (!trigger.nsdDecision()) vetoEvent;
_sumWPassed->fill();
// Count final state particles in several eta regions
const int Nch = apply<ChargedFinalState>(event, "CFS").size();
// Fill histograms
_hist_nch->fill(Nch);
_hist_mean_nch->fill(_hist_mean_nch->bin(0).xMid(), Nch);
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_hist_nch, 1.0 / *_sumWPassed);
scale(_hist_mean_nch, 1.0 / *_sumWPassed);
}
private:
CounterPtr _sumWPassed;
Histo1DPtr _hist_mean_nch;
Histo1DPtr _hist_nch;
};
RIVET_DECLARE_ALIASED_PLUGIN(UA5_1987_S1640666, UA5_1987_I244829);
}
|