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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
namespace Rivet {
/// @brief e+e- -> pi+pi-
class SND_2020_I1789269 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(SND_2020_I1789269);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(FinalState(), "FS");
// Book histograms
book(_npion, "TMP/pion");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const FinalState& fs = apply<FinalState>(event, "FS");
if(fs.particles().size()!=2) vetoEvent;
for (const Particle& p : fs.particles()) {
if(abs(p.pid())!=PID::PIPLUS) vetoEvent;
}
_npion->fill();
}
/// Normalise histograms etc., after the run
void finalize() {
double sigma = _npion->val();
double error = _npion->err();
sigma *= crossSection()/ sumOfWeights() /nanobarn;
error *= crossSection()/ sumOfWeights() /nanobarn;
Scatter2D temphisto(refData(1, 1, 4));
Scatter2DPtr mult;
book(mult, 1, 1, 4);
for (size_t b = 0; b < temphisto.numPoints(); b++) {
const double x = temphisto.point(b).x();
pair<double,double> ex = temphisto.point(b).xErrs();
pair<double,double> ex2 = ex;
if(ex2.first ==0.) ex2. first=0.0001;
if(ex2.second==0.) ex2.second=0.0001;
if (inRange(sqrtS()/MeV, x-ex2.first, x+ex2.second)) {
mult->addPoint(x, sigma, ex, make_pair(error,error));
}
else {
mult->addPoint(x, 0., ex, make_pair(0.,.0));
}
}
}
///@}
/// @name Histograms
///@{
CounterPtr _npion;
///@}
};
RIVET_DECLARE_PLUGIN(SND_2020_I1789269);
}
|