Rivet analyses
Cross section for e+e− → π+π−π0 between 1.04 and 1.38 GeV.
Experiment: SND (VEPP-2M)
Inspire ID: 508003
Status: VALIDATED
Authors: - Peter Richardson
References: - Phys.Lett. B462 (1999) 365-370, 1999
Beams: e+ e-
Beam energies: (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.5, 0.5); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.6, 0.6); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7); (0.7, 0.7)GeV
Run details: - e+ e- to hadrons
Measurement of the cross section for e+e− → π+π−π0 by SND for energies between 1.04 and 1.38 GeV.
Source
code:SND_1999_I508003.cc
// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
namespace Rivet {
/// @brief e+e- -> pi+pi-pi0
class SND_1999_I508003 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(SND_1999_I508003);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
declare(FinalState(), "FS");
book(_num3pi, 1, 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!=3) vetoEvent;
if(nCount[-211]==1&&nCount[211]==1&&nCount[111]==1)
_num3pi->fill(round(sqrtS()/MeV));
}
/// Normalise histograms etc., after the run
void finalize() {
scale(_num3pi, crossSection()/ sumOfWeights() /nanobarn);
}
/// @}
/// @name Histograms
/// @{
BinnedHistoPtr<int> _num3pi;
/// @}
};
RIVET_DECLARE_PLUGIN(SND_1999_I508003);
}