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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
namespace Rivet {
/// @brief CMD3 K0 K0 pi+pi-
class CMD3_2019_I1770428 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CMD3_2019_I1770428);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(FinalState(), "FS");
// Book histograms
book(_cK0K0pippim , "TMP/K0K0pippim");
book( _h_pipi ,2,1,1);
book( _h_total,2,1,2);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
const FinalState& fs = apply<FinalState>(event, "FS");
map<long,int> nCount;
int ntotal(0);
Particles pip,k0;
for (const Particle& p : fs.particles()) {
nCount[p.pid()] += 1;
if(p.abspid()==211)
pip.push_back(p);
else if(p.pid()==310)
k0.push_back(p);
++ntotal;
}
if(ntotal==4 && nCount[310]==2 && nCount[211]==1 && nCount[-211]==1) {
_cK0K0pippim->fill();
FourMomentum ppipi = pip[0].momentum()+pip[1].momentum();
_h_pipi->fill(ppipi.mass()/MeV);
for(unsigned int ix=0;ix<2;++ix)
_h_total->fill((ppipi+k0[ix].momentum()).mass()/MeV);
}
}
/// Normalise histograms etc., after the run
void finalize() {
normalize(_h_pipi );
normalize(_h_total);
double fact = crossSection()/ sumOfWeights() /nanobarn;
double sigma = _cK0K0pippim->val()*fact;
double error = _cK0K0pippim->err()*fact;
Scatter2D temphisto(refData(1, 1, 6));
Scatter2DPtr mult;
book(mult, 1, 1, 6);
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 _cK0K0pippim;
Histo1DPtr _h_pipi, _h_total;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(CMD3_2019_I1770428);
}
|