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| // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/FinalState.hh"
namespace Rivet {
/// @brief e+e- > pi+ pi- 2pi0 (including omega)
class BABAR_2017_I1621593 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2017_I1621593);
/// @name Analysis methods
//@{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(FinalState(), "FS");
declare(UnstableParticles(), "UFS");
book(_num4pi, "TMP/num4");
book(_numOmega, "TMP/numOmega");
_mult.resize(2);
book(_mult[0], 1, 1, 1);
book(_mult[1], 2, 1, 1);
}
/// 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;
}
if(ntotal!=4) vetoEvent;
if(nCount[-211]==1&&nCount[211]==1&&nCount[111]==2) {
_num4pi->fill();
const FinalState& ufs = apply<FinalState>(event, "UFS");
if (!ufs.particles(Cuts::pid==223).empty()) {
_numOmega->fill();
}
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(size_t ix=1;ix<3;++ix) {
double sigma,error;
if(ix==1) {
sigma = _num4pi->val();
error = _num4pi->err();
}
else {
sigma = _numOmega->val();
error = _numOmega->err();
}
sigma *= crossSection()/ sumOfWeights() /nanobarn;
error *= crossSection()/ sumOfWeights() /nanobarn;
Scatter2D temphisto(refData(ix, 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[ix-1]->addPoint(x, sigma, ex, make_pair(error,error));
}
else {
_mult[ix-1]->addPoint(x, 0., ex, make_pair(0.,.0));
}
}
}
}
//@}
/// @name Histograms
//@{
CounterPtr _num4pi, _numOmega;
vector<Scatter2DPtr> _mult;
//@}
};
// The hook for the plugin system
RIVET_DECLARE_PLUGIN(BABAR_2017_I1621593);
}
|