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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
namespace Rivet {
/// @brief Measurement of R
class PDG_R : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(PDG_R);
/// @name Analysis methods
///@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(FinalState(), "FS");
// Book histograms
book(_c_hadrons, "/TMP/sigma_hadrons");
book(_c_muons, "/TMP/sigma_muons");
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const FinalState& fs = apply<FinalState>(event, "FS");
map<long,int> nCount;
int ntotal(0);
for (const Particle& p : fs.particles()) {
nCount[p.pid()] += 1;
++ntotal;
}
// mu+mu- + photons
if(nCount[-13]==1 and nCount[13]==1 &&
ntotal==2+nCount[22])
_c_muons->fill();
// everything else
else
_c_hadrons->fill();
}
/// Normalise histograms etc., after the run
void finalize() {
Scatter1D R = *_c_hadrons/ *_c_muons;
double rval = R.point(0).x();
pair<double,double> rerr = R.point(0).xErrs();
double fact = crossSection()/ sumOfWeights() /picobarn;
double sig_h = _c_hadrons->val()*fact;
double err_h = _c_hadrons->err()*fact;
double sig_m = _c_muons ->val()*fact;
double err_m = _c_muons ->err()*fact;
Scatter2D temphisto(refData(1, 1, 1));
Scatter2DPtr hadrons;
book(hadrons, "sigma_hadrons");
Scatter2DPtr muons;
book(muons, "sigma_muons" );
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, rval, ex, rerr);
hadrons->addPoint(x, sig_h, ex, make_pair(err_h,err_h));
muons ->addPoint(x, sig_m, ex, make_pair(err_m,err_m));
}
else {
mult ->addPoint(x, 0., ex, make_pair(0.,.0));
hadrons->addPoint(x, 0., ex, make_pair(0.,.0));
muons ->addPoint(x, 0., ex, make_pair(0.,.0));
}
}
}
///@}
/// @name Histograms
///@{
CounterPtr _c_hadrons, _c_muons;
///@}
};
RIVET_DECLARE_PLUGIN(PDG_R);
}
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