Rivet analyses

title: BELLE_2008_I764099

Cross Section for $e^+e^-\to\Upsilon(1,2,3S)\pi^+\pi^-$ and $\Upsilon(1S)K^+K^-$ 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 $e^+e^-\to\Upsilon(1,2,3S)\pi^+\pi^-$ and $\Upsilon(1S)K^+K^-$ at 10.87 GeV measured by BELLE.

Source code:BELLE_2008_I764099.cc

```c++ // -- 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);

} ```