Rivet analyses

title: BELLE_2013_I1252555

Measurement of the cross section for $e^+e^-\to \omega\pi^0$, $K^\bar{K}$ and $K_2^(1430)\bar{K}$ for $\sqrt{s}\sim10.6$ GeV

Experiment: BELLE (KEKB)

Inspire ID: 1252555

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Phys.Rev.D 88 (2013) 5, 052019

Beams: e+ e-

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

Run details: - e+ e- to hadrons, pi0 and KS0 set stable

Measurement of the cross section for $e^+e^-\to \omega\pi^0$, $K^\bar{K}$ and $K_2^(1430)\bar{K}$ for $\sqrt{s}\sim10.86$ GeV.

Source code:BELLE_2013_I1252555.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/FinalState.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief e+e- > omega pi0, K* Kbar K2 Kbar class BELLE_2013_I1252555 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2013_I1252555);


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

/// Book histograms and initialise projections before the run
void init() {
  // Initialise and register projections
  declare(FinalState(), "FS");
  declare(UnstableParticles(), "UFS");

  // counters
  for (size_t ix = 0; ix < 5; ++ix) {
    book(_sigma[ix], 1 + ix, 1, 1);
  }
  for (const string& en : _sigma[0].binning().edges<0>()) {
    const double eval = stod(en);
    if (isCompatibleWithSqrtS(eval)) {
      _sqs = en;
      break;
    }
  }
  raiseBeamErrorIf(_sqs.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()] -= 1;
      --ncount;
    }
    else {
      findChildren(child, nRes, ncount);
    }
  }
}

/// Perform the per-event analysis
void analyze(const Event& event) {
  // final state particles
  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;
  }
  // resonances
  for (const Particle& p :
       apply<UnstableParticles>(event, "UFS")
           .particles(Cuts::abspid == 223 || Cuts::abspid == 313 || Cuts::abspid == 323
                      || Cuts::abspid == 315 || Cuts::abspid == 325)) {
    map<long, int> nRes = nCount;
    int ncount = ntotal;
    findChildren(p, nRes, ncount);
    if (ncount != 1) continue;
    unsigned int imode = 0;
    long pid = 111;
    if (p.abspid() == 313) {
      imode = 1;
      pid = 310;
    }
    else if (p.abspid() == 323) {
      imode = 2;
      pid = p.pid() > 0 ? -321 : 321;
    }
    else if (p.abspid() == 315) {
      imode = 3;
      pid = 310;
    }
    else if (p.abspid() == 325) {
      imode = 4;
      pid = p.pid() > 0 ? -321 : 321;
    }
    bool matched = true;
    for (const auto& val : nRes) {
      if ((pid == 310 && (val.first == 310 || val.second == 130)) || val.first == pid) {
        if (val.second != 1) {
          matched = false;
          break;
        }
      }
      else if (val.second != 0) {
        matched = false;
        break;
      }
    }
    if (matched) {
      _sigma[imode]->fill(_sqs);
      break;
    }
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  scale(_sigma, crossSection() / sumOfWeights() / femtobarn);
}

/// @}


/// @name Histograms
/// @{
BinnedHistoPtr<string> _sigma[5];
string _sqs = "";
/// @}

};

RIVET_DECLARE_PLUGIN(BELLE_2013_I1252555);

} ```