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Rivet analyses reference
BESIII_2021_I1921801
Mass distributions in $\psi(2S)\to\omega K^0_SK^0_S$
Experiment: BESIII (BEPC)
Inspire ID: 1921801
Status: VALIDATED NOHEPDATA
Authors:
References:
- Phys.Rev.D 104 (2021) 9, 092003
Beams: * *
Beam energies: ANY
Run details:
- Any process producing psi(2S), originally e+e-
Measurement of mass distributions in $\psi(2S)\to\omega K^0_SK^0_S$ by BES. N.B. data read from plots and may not be corrected, no difference between $K_{S1}^0$ and $K^0_{S2}$ so these are symeterised.
Source code:
BESIII_2021_I1921801.cc
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85 | // -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"
#include "Rivet/Projections/DecayedParticles.hh"
namespace Rivet {
/// @brief psi(2S) -> omega KS0 KS0
class BESIII_2021_I1921801 : public Analysis {
public:
/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2021_I1921801);
/// @name Analysis methods
/// @{
/// Book histograms and initialise projections before the run
void init() {
// Initialise and register projections
UnstableParticles ufs = UnstableParticles(Cuts::pid==100443);
declare(ufs, "UFS");
DecayedParticles psi2S(ufs);
psi2S.addStable(PID::PI0);
psi2S.addStable(PID::K0S);
psi2S.addStable(PID::ETA);
psi2S.addStable(PID::ETAPRIME);
psi2S.addStable(PID::OMEGA);
declare(psi2S, "psi2S");
// histograms
for(unsigned int ix=0;ix<3;++ix)
book(_h[ix],1,1,1+ix);
book(_dalitz, "dalitz" ,50,1.,11.,50,1.,11.);
}
/// Perform the per-event analysis
void analyze(const Event& event) {
// define the decay mode
static const map<PdgId,unsigned int> & mode = { { 310,2},{ 223,1}};
DecayedParticles psi2S = apply<DecayedParticles>(event, "psi2S");
// loop over particles
for(unsigned int ix=0;ix<psi2S.decaying().size();++ix) {
if(!psi2S.modeMatches(ix,3,mode)) continue;
const Particles & K0 = psi2S.decayProducts()[ix].at(310);
const Particles & omega = psi2S.decayProducts()[ix].at(223);
double m2Komega[2]={(K0[0].momentum()+omega[0].momentum()).mass2(),
(K0[1].momentum()+omega[0].momentum()).mass2()};
for(unsigned int ix=0;ix<2;++ix) {
double mKo = sqrt(m2Komega[ix]);
_h[0]->fill(mKo);
_h[1]->fill(mKo);
}
_h[2]->fill((K0[0].momentum()+K0[1].momentum()).mass());
_dalitz->fill(m2Komega[0],m2Komega[1]);
_dalitz->fill(m2Komega[1],m2Komega[0]);
}
}
/// Normalise histograms etc., after the run
void finalize() {
for(unsigned int ix=0;ix<3;++ix)
normalize(_h[ix],1.,false);
normalize(_dalitz);
}
/// @}
/// @name Histograms
/// @{
Histo1DPtr _h[3];
Histo2DPtr _dalitz;
/// @}
};
RIVET_DECLARE_PLUGIN(BESIII_2021_I1921801);
}
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