Rivet analyses

title: BELLE_2005_I686014

Rates and Spectra for Charm hadrons in $\Upsilon(4S)$ decays and the continuum

Experiment: BELLE (KEKB)

Inspire ID: 686014

Status: VALIDATED

Authors: - Peter Richardson

References: none listed

Beams: e+ e-

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

Run details: - e+e- to hadrons at the Upsilon 4S and nearby continuum.

Measurement of the cross section and scaled momentum spectrum for the production of charm hadrons, $D^0$, $D^+$, $D_s^+$, $\Lambda_c^+$, $D^{0}$ and $D^{+}$. The cross section and spectra in the continuum together with the branching ratio and spectra in $\Upsilon(4S)$ decays are measured.

Source code:BELLE_2005_I686014.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/FastJets.hh"

include "Rivet/Projections/FinalState.hh"

include "Rivet/Projections/LeptonFinder.hh"

include "Rivet/Projections/MissingMomentum.hh"

include "Rivet/Projections/PromptFinalState.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief Charm-hadron production class BELLE_2005_I686014 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(BELLE_2005_I686014);


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

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

  // histos
  for (double eVal : allowedEnergies()) {

    const string en = toString(round(eVal / MeV));
    if (isCompatibleWithSqrtS(eVal, 1e-3)) _sqs = en;
    bool ih = en != "10520"s;

    for (size_t ix = 0; ix < 7; ++ix) {
      book(_r[en][ix], 2 - ih, 1, ix + 1);
      book(_h[en][ix], 3 + ih, 1, ix + 1);
    }
    book(_c[en], "TMP/wgt" + en);
  }
  raiseBeamErrorIf(_sqs.empty());
}

/// Perform the per-event analysis
void analyze(const Event& event) {
  // unstable particles
  const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
  if (_sqs == "10580"s && ufs.particles(Cuts::pid == 300553).size() != 1) vetoEvent;

  _c[_sqs]->fill();
  for (const Particle& p :
       ufs.particles(Cuts::abspid == 411 || Cuts::abspid == 421 || Cuts::abspid == 431
                     || Cuts::abspid == 413 || Cuts::abspid == 423 || Cuts::abspid == 4122)) {
    double pmax = sqrt(0.25 * sqr(sqrtS()) - sqr(p.mass()));
    double xp = p.mom().p3().mod() / pmax;
    if (p.abspid() == 421) {
      _r[_sqs][0]->fill(0.5);
      _h[_sqs][0]->fill(xp);
    }
    else if (p.abspid() == 411) {
      _r[_sqs][1]->fill(0.5);
      _h[_sqs][1]->fill(xp);
    }
    else if (p.abspid() == 431) {
      _r[_sqs][2]->fill(0.5);
      _h[_sqs][2]->fill(xp);
    }
    else if (p.abspid() == 4122) {
      _r[_sqs][3]->fill(0.5);
      _h[_sqs][3]->fill(xp);
    }
    else if (p.abspid() == 413) {
      _r[_sqs][4]->fill(0.5);
      _h[_sqs][4]->fill(xp);
      _r[_sqs][5]->fill(0.5);
      _h[_sqs][5]->fill(xp);
    }
    else if (p.abspid() == 423) {
      _r[_sqs][6]->fill(0.5);
      _h[_sqs][6]->fill(xp);
    }
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  for (double eVal : allowedEnergies()) {
    const string en = toString(round(eVal / MeV));
    if (en == "10520"s) {
      scale(_r[en], crossSection() / picobarn / sumOfWeights());
    }
    else {
      scale(_r[en], 0.5 / *_c[en]);
    }
    scale(_h[en], crossSection() / nanobarn / sumOfWeights());
  }
}

/// @}


/// @name Histograms
/// @{
map<string, map<int, Histo1DPtr>> _h;
map<string, map<int, Histo1DPtr>> _r;
map<string, CounterPtr> _c;
string _sqs = "";
/// @}

};

RIVET_DECLARE_PLUGIN(BELLE_2005_I686014);

} ```