Rivet analyses

Cross Section for e⁺e⁻ → Υ(1, 2, 3S)π⁺π⁻ and Υ(1S)K⁺K⁻ at 10.87 GeV

Experiment: BELLE (KEKB)

Inspire ID: 764099

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Rev.Lett. 100 (2008) 112001, 2008

Beams: e+ e-

Beam energies: (5.4, 5.4)GeV

Run details: - e+e- to hadrons

Measurement of the cross section for e⁺e⁻ → Υ(1, 2, 3S)π⁺π⁻ and Υ(1S)K⁺K⁻ at 10.87 GeV measured by BELLE.

Source code:`BELLE_2008_I764099.cc`

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

namespace Rivet {


  /// @brief Add a short analysis description here
  class BELLE_2008_I764099 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2008_I764099);


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

    /// Book histograms and initialise projections before the run
    void init() {
      declare(FinalState(), "FS");
      declare(UnstableParticles(), "UFS");
      book(_nUps1pipi, 1, 1, 1);
      book(_nUps2pipi, 2, 1, 1);
      book(_nUps3pipi, 3, 1, 1);
      book(_nUps1KK, 4, 1, 1);
    }

    void findChildren(const Particle& p, map<long, int>& nRes, int& ncount) {
      for (const Particle& child : p.children()) {
        if (child.children().empty()) {
          --nRes[child.pid()];
          --ncount;
        }
        else
          findChildren(child, nRes, ncount);
      }
    }

    /// 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;
      }
      const FinalState& ufs = apply<FinalState>(event, "UFS");
      for (const Particle& p : ufs.particles()) {
        if (p.children().empty()) continue;
        if (p.pid() != 553 && p.pid() != 100553 && p.pid() != 200553) continue;
        map<long, int> nRes = nCount;
        int ncount = ntotal;
        findChildren(p, nRes, ncount);
        if (ncount != 2) continue;
        bool matched = true;
        for (const auto& val : nRes) {
          if (abs(val.first) == 321 || abs(val.first) == 211) {
            continue;
          }
          else if (val.second != 0) {
            matched = false;
            break;
          }
        }
        if (matched) {
          if (nRes[211] == 1 && nRes[-211] == 1) {
            if (p.pid() == 553) _nUps1pipi->fill("10.87"s);
            if (p.pid() == 100553) _nUps2pipi->fill("10.87"s);
            if (p.pid() == 200553) _nUps3pipi->fill("10.87"s);
          }
          else if (nRes[321] == 1 && nRes[-321] == 1) {
            if (p.pid() == 553) _nUps1KK->fill("10.87"s);
          }
        }
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      double fact = crossSection() / sumOfWeights() / picobarn;
      scale(_nUps1pipi, fact);
      scale(_nUps2pipi, fact);
      scale(_nUps3pipi, fact);
      scale(_nUps1KK, fact);
    }

    /// @}

    /// @name Histograms
    /// @{
    BinnedHistoPtr<string> _nUps1pipi, _nUps2pipi, _nUps3pipi, _nUps1KK;
    /// @}
  };

  RIVET_DECLARE_PLUGIN(BELLE_2008_I764099);

}

Rivet analyses

Cross Section for e+e− → Υ(1, 2, 3S)π+π− and Υ(1S)K+K− at 10.87 GeV

Source code:BELLE_2008_I764099.cc

Cross Section for e⁺e⁻ → Υ(1, 2, 3S)π⁺π⁻ and Υ(1S)K⁺K⁻ at 10.87 GeV

Source code:`BELLE_2008_I764099.cc`