Rivet analyses

Cross sections for e⁺e⁻→ K⁺K⁻π⁺π⁻(π⁰), K⁺K⁻K⁺K⁻(π⁰), π⁺π⁻π⁺π⁻(π⁰) and pp̄π⁺π⁻(π⁰) between 3.773 and 4.6 GeV

Experiment: BESIII (BEPC)

Inspire ID: 1929314

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Rev.D 104 (2021) 11, 112009

Beams: e+ e-

Beam energies: (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (1.9, 1.9); (2.0, 2.0); (2.0, 2.0); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.1, 2.1); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.2, 2.2); (2.3, 2.3); (2.3, 2.3); (2.3, 2.3)GeV

Run details: - e+e- to hadrons

Measurement of the dressed cross sections for e⁺e⁻→ K⁺K⁻π⁺π⁻(π⁰), K⁺K⁻K⁺K⁻(π⁰), π⁺π⁻π⁺π⁻(π⁰) and pp̄π⁺π⁻(π⁰) between 3.773 and 4.6 GeV by the BESIII collaboration. There were three duplicate energy points in the data, for these points the one with higher statistics was retained.

Source code:`BESIII_2021_I1929314.cc`

// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"

namespace Rivet {


  /// @brief e+e- -> 4 charged particles (+pi0) cross sections
  class BESIII_2021_I1929314 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(BESIII_2021_I1929314);


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

    /// Book histograms and initialise projections before the run
    void init() {
      declare(FinalState(), "FS");
      for (size_t ix=0; ix<8; ++ix) {
        book(_nCharged[ix], 1, 1, ix+1);
      }

      for (const string& en : _nCharged[0].binning().edges<0>()) {
        const double eval = stod(en)*GeV;
        if (isCompatibleWithSqrtS(eval)) {
          _sqs = en; break;
        }
      }
      raiseBeamErrorIf(_sqs.empty());
    }


    /// 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) {
        if (nCount[211]==1 && nCount[-211]==1) {
          if (nCount[321]==1 && nCount[-321]==1)         _nCharged[0]->fill(_sqs);
          else if (nCount[2212]==1 && nCount[-2212]==1)  _nCharged[3]->fill(_sqs);
        }
        else if (nCount[321]==2 && nCount[-321]==2)      _nCharged[1]->fill(_sqs);
        else if (nCount[211]==2 && nCount[-211]==2)      _nCharged[2]->fill(_sqs);
      }
      else if (ntotal==5 && nCount[111]==1) {
        if (nCount[211]==1 && nCount[-211]==1) {
          if (nCount[321]==1 && nCount[-321]==1)         _nCharged[4]->fill(_sqs);
          else if (nCount[2212]==1 && nCount[-2212]==1)  _nCharged[7]->fill(_sqs);
        }
        else if (nCount[321]==2 && nCount[-321]==2 )     _nCharged[5]->fill(_sqs);
        else if (nCount[211]==2 && nCount[-211]==2 )     _nCharged[6]->fill(_sqs);
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      scale(_nCharged, crossSection()/ sumOfWeights() /picobarn);
    }
    /// @}


    /// @name Histograms
    /// @{
    BinnedHistoPtr<string> _nCharged[8];
    string _sqs = "";
    /// @}


  };


  RIVET_DECLARE_PLUGIN(BESIII_2021_I1929314);

}

Rivet analyses

Cross sections for e+e−→ K+K−π+π−(π0), K+K−K+K−(π0), π+π−π+π−(π0) and pp̄π+π−(π0) between 3.773 and 4.6 GeV

Source code:BESIII_2021_I1929314.cc

Cross sections for e⁺e⁻→ K⁺K⁻π⁺π⁻(π⁰), K⁺K⁻K⁺K⁻(π⁰), π⁺π⁻π⁺π⁻(π⁰) and pp̄π⁺π⁻(π⁰) between 3.773 and 4.6 GeV

Source code:`BESIII_2021_I1929314.cc`