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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
namespace Rivet {
/// @brief J/psi production at low energies
class BESIII_2021_I1908066 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2021_I1908066);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(UnstableParticles(), "UFS");
book(_c_psi , "/TMP/sigma_psi");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
unsigned int count = ufs.particles(Cuts::pid==443).size();
_c_psi->fill(count);
}
/// Normalise histograms etc., after the run
void finalize() {
double fact = crossSection()/nanobarn/sumOfWeights();
double sigma = _c_psi->val()*fact;
double error = _c_psi->err()*fact;
Scatter2D temphisto(refData(1, 1, 1));
Scatter2DPtr mult;
book(mult, 1, 1, 1);
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()/GeV, 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 _c_psi;
///@}
};
RIVET_DECLARE_PLUGIN(BESIII_2021_I1908066);
}
|