Rivet analyses

Measurements of R for bb̄ and Υ(1, 2, 3S)π+π− between 10.63 and 11.05 GeV

Experiment: BELLE (KEKB)

Inspire ID: 1336624

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Rev. D93 (2016) no.1, 011101

Beams: e+ e-

Beam energies: (5.3, 5.3); (5.3, 5.3); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.4, 5.4); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5); (5.5, 5.5)GeV

Run details: - e+e- to hadrons and muons (for normalisation)

Measurement of the ratio of the cross sections for e+e− → Υ(1, 2, 3S)π+π− and e+e− → bb̄ to the muon cross section for energies between 10.63 and 11.05 GeV by the BELLE collaboration.

Source code:BELLE_2015_I1336624.cc

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

namespace Rivet {


  /// @brief e+e- > bbar and Upsilon(1,2,3) pi+pi-
  class BELLE_2015_I1336624 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2015_I1336624);


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

    /// Book histograms and initialise projections before the run
    void init() {

      // Initialise and register projections
      declare(FinalState(), "FS");
      declare(UnstableParticles(), "UFS");

      // Book histograms
      const YODA::BinnedEstimate<string>& ref = refData<YODA::BinnedEstimate<string>>(2,1,1);
      book(_c_hadrons, "TMP/c_hadrons", ref);
      book(_c_muons[0], "/TMP/sigma_muons_1", ref);
      book(_c_muons[1], "/TMP/sigma_muons_2", refData<YODA::BinnedEstimate<string>>(1,1,1));
      for (size_t ix=0; ix<3; ++ix) {
        book(_c_Ups[ix], "/TMP/c_Ups_"+toString(ix+1), refData<YODA::BinnedEstimate<string>>(1,1,1+ix));
      }
      for (size_t ix=0; ix<_sqs.size(); ++ix) {
        for (const string& en : _c_muons[ix].binning().edges<0>()) {
          const double eval = stod(en)*MeV;
          if (isCompatibleWithSqrtS(eval)) {
            _sqs[ix] = eval; break;
          }
        }
      }
      raiseBeamErrorIf(_sqs[0].empty() && _sqs[1].empty());
    }

    void findChildren(const Particle& p, map<long,int>& nRes, int& ncount) const {
      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) {
      // analyse the final state
      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;
      }
      // intermediates
      bool isBottom(false);
      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
      for (const Particle& p : ufs.particles()) {
        // check for bottom hadrons
        if (PID::isBottomHadron(p.pid()) && (p.abspid()%1000)/10!=55) {
          isBottom = true;
          break;
        }
        // upsilon + pi+pi-
        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)==211) {
            continue;
          }
          else if (val.second!=0) {
            matched = false;
            break;
          }
        }
        if (matched) {
          if (nRes[211]==1 && nRes[-211]==1) {
            if (p.pid()==553)     _c_Ups[0]->fill(_sqs[1]);
            if (p.pid()==100553)  _c_Ups[1]->fill(_sqs[1]);
            if (p.pid()==200553)  _c_Ups[2]->fill(_sqs[1]);
          }
        }
      }
      // mu+mu- + photons
      if (nCount[-13]==1 && nCount[13]==1 && ntotal==2+nCount[22]) {
        _c_muons[0]->fill(_sqs[0]);
        _c_muons[1]->fill(_sqs[1]);
      }
      // open bottom
      else if(isBottom) {
        _c_hadrons->fill(_sqs[0]);
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {

      BinnedEstimatePtr<string> tmp;
      book(tmp, 2, 1, 1);
      divide(_c_hadrons, _c_muons[0], tmp);

      for (size_t ix=0; ix<3; ++ix) {
        book(tmp, 1, 1, 1+ix);
        divide(_c_Ups[ix], _c_muons[1], tmp);
      }
    }

    /// @}


    /// @name Histograms
    /// @{
    BinnedHistoPtr<string> _c_hadrons, _c_muons[2], _c_Ups[3];
    vector<string> _sqs = {"", ""};
    /// @}


  };


  RIVET_DECLARE_PLUGIN(BELLE_2015_I1336624);

}