Rivet analyses

title: BESIII_2023_I2713388

$\psi(2S)\to \Sigma^+\bar\Sigma^-\omega$ and $\Sigma^+\bar\Sigma^-\phi$

Experiment: BESIII (BEPC)

Inspire ID: 2713388

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Phys.Rev.D 108 (2023) 9, 092011 - arXiv: 2310.14585

Beams: * *

Beam energies: ANY

Run details: - Any process producing psi(2S) originally e+e-

Measurement of the mass distributions in the decays $\psi(2S)\to \Sigma^+\bar\Sigma^-\omega$ and $\Sigma^+\bar\Sigma^-\phi$. The data were read from the plots in the paper. It is also not clear that any resolution effects have been unfolded.

Source code:BESIII_2023_I2713388.cc

```c++ // -- C++ --

include "Rivet/Analysis.hh"

include "Rivet/Projections/DecayedParticles.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief psi(2S) -> Sigma+ Sigmabar- + omega/phi class BESIII_2023_I2713388 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2023_I2713388);


/// @name Analysis methods
/// @{

/// Book histograms and initialise projections before the run
void init() {
  UnstableParticles ufs = UnstableParticles(Cuts::pid == 100443);
  declare(ufs, "UFS");
  DecayedParticles psi(ufs);
  psi.addStable(PID::PI0);
  psi.addStable(PID::K0S);
  psi.addStable(PID::PHI);
  psi.addStable(PID::OMEGA);
  psi.addStable(3222);
  psi.addStable(-3222);
  declare(psi, "psi");
  for (unsigned int ix = 0; ix < 2; ++ix) {
    for (unsigned int iy = 0; iy < 3; ++iy) {
      book(_h[ix][iy], 1 + ix, 1, 1 + iy);
    }
  }
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  DecayedParticles psi = apply<DecayedParticles>(event, "psi");
  // loop over particles
  for (unsigned int ix = 0; ix < psi.decaying().size(); ++ix) {
    unsigned int iloc = 0;
    if (psi.modeMatches(ix, 3, mode1))
      iloc = 0;
    else if (psi.modeMatches(ix, 3, mode2))
      iloc = 1;
    else
      continue;
    const Particle& vecm = psi.decayProducts()[ix].at(iloc == 0 ? 223 : 333)[0];
    const Particle& sigp = psi.decayProducts()[ix].at(3222)[0];
    const Particle& sigm = psi.decayProducts()[ix].at(-3222)[0];
    _h[iloc][0]->fill((sigp.mom() + vecm.mom()).mass());
    _h[iloc][1]->fill((sigm.mom() + vecm.mom()).mass());
    _h[iloc][2]->fill((sigp.mom() + sigm.mom()).mass());
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  for (unsigned int ix = 0; ix < 2; ++ix) normalize(_h[ix]);
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h[2][3];
const map<PdgId, unsigned int> mode1 = {{3222, 1}, {-3222, 1}, {223, 1}};
const map<PdgId, unsigned int> mode2 = {{3222, 1}, {-3222, 1}, {333, 1}};
/// @}

};

RIVET_DECLARE_PLUGIN(BESIII_2023_I2713388);

} ```