Rivet analyses

title: BELLE_2013_I1216515

Pion and kaon identified particle spectra at $\sqrt{s}=10.52$~GeV

Experiment: Belle (KEKB)

Inspire ID: 1216515

Status: VALIDATED SUPERSEEDED

Authors: - Peter Richardson

References: - Phys.Rev.Lett. 111 (2013) 6, 062002 - arXiv: 1301.6183 - DOI: 10.1103/PhysRevLett.111.062002

Beams: e+ e-

Beam energies: (3.5, 7.9)GeV

Run details: - $e^+ e^-$ analysis at 10.52

Analysis of the identified particle spectra for charged pions and kaons at 10.52 GeV. This is continuum data below the $\Upsilon(4S)$ resonance. Superseeded by BELLE_2020_I1777678.

Source code:BELLE_2013_I1216515.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/Beam.hh"

include "Rivet/Projections/ChargedFinalState.hh"

namespace Rivet {

/// @brief BELLE pion and kaon continuum production /// @author Peter Richardson class BELLE_2013_I1216515 : public Analysis { public:

BELLE_2013_I1216515()
    : Analysis("BELLE_2013_I1216515") { }


void analyze(const Event& e) {
  // Loop through charged FS particles and look for charmed mesons/baryons
  const ChargedFinalState& fs = apply<ChargedFinalState>(e, "FS");

  const Beam beamproj = apply<Beam>(e, "Beams");
  const ParticlePair& beams = beamproj.beams();
  const FourMomentum mom_tot = beams.first.momentum() + beams.second.momentum();
  const LorentzTransform cms_boost = LorentzTransform::mkFrameTransformFromBeta(mom_tot.betaVec());
  MSG_DEBUG("CMS energy sqrt s = " << beamproj.sqrtS());

  for (const Particle& p : fs.particles()) {
    // energy in CMS frame
    const double en = cms_boost.transform(p.momentum()).t();
    const double z = 2. * en / beamproj.sqrtS();
    const int PdgId = p.abspid();
    MSG_DEBUG("pdgID = " << PdgId << "  Energy = " << en);
    switch (PdgId) {
      case PID::PIPLUS: _histPion->fill(z); break;
      case PID::KPLUS: _histKaon->fill(z); break;
      default: break;
    }
  }
} // analyze


void finalize() {

  scale(_histPion, crossSection() / femtobarn / sumOfWeights());
  scale(_histKaon, crossSection() / femtobarn / sumOfWeights());
} // finalize


void init() {
  declare(Beam(), "Beams");
  declare(ChargedFinalState(), "FS");

  book(_histPion, 1, 1, 1);
  book(_histKaon, 1, 1, 2);

} // init

private:

/// @{
// Histograms for continuum data (sqrt(s) = 10.52 GeV)
Histo1DPtr _histPion;
Histo1DPtr _histKaon;
/// @}

};

RIVET_DECLARE_PLUGIN(BELLE_2013_I1216515);

} ```