Rivet analyses

Mass distributions in Ξ_c⁻ → pK⁻K⁻π⁺

Experiment: CLEOIII (CESR)

Inspire ID: 627327

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - Phys.Rev.D 69 (2004) 052004

Beams: * *

Beam energies: ANY

Run details: - Any process producing Xic0 mesons

Measurement of the mass distributions in the decay Ξ_c⁻ → pK⁻K⁻π⁺ by CLEOIII. The data were read from the plots in the paper.

Source code:`CLEOIII_2004_I627327.cc`

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

namespace Rivet {


  /// @brief Xi_c0 -> p K- K- pi+
  class CLEOIII_2004_I627327 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(CLEOIII_2004_I627327);


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

    /// Book histograms and initialise projections before the run
    void init() {
      // Initialise and register projections
      UnstableParticles ufs = UnstableParticles(Cuts::abspid == 4132);
      declare(ufs, "UFS");
      DecayedParticles XIC0(ufs);
      XIC0.addStable(PID::PI0);
      XIC0.addStable(PID::K0S);
      XIC0.addStable(PID::ETA);
      declare(XIC0, "XIC0");
      // histograms
      book(_h, 1, 1, 1);
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      static const map<PdgId, unsigned int>& mode = {{PID::KMINUS, 2}, {2212, 1}, {PID::PIPLUS, 1}};
      static const map<PdgId, unsigned int>& modeCC = {{PID::KPLUS, 2}, {-2212, 1}, {PID::PIMINUS, 1}};
      DecayedParticles XIC0 = apply<DecayedParticles>(event, "XIC0");
      // loop over particles
      for (unsigned int ix = 0; ix < XIC0.decaying().size(); ++ix) {
        int sign = 1;
        if (XIC0.decaying()[ix].pid() > 0 && XIC0.modeMatches(ix, 4, mode)) {
          sign = 1;
        }
        else if (XIC0.decaying()[ix].pid() < 0 && XIC0.modeMatches(ix, 4, modeCC)) {
          sign = -1;
        }
        else
          continue;
        const Particle& pip = XIC0.decayProducts()[ix].at(sign * PID::PIPLUS)[0];
        const Particles& Km = XIC0.decayProducts()[ix].at(sign * PID::KMINUS);
        for (unsigned int ix = 0; ix < 2; ++ix) _h->fill((pip.momentum() + Km[ix].momentum()).mass());
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      normalize(_h, 1., false);
    }

    /// @}


    /// @name Histograms
    /// @{
    Histo1DPtr _h;
    /// @}
  };


  RIVET_DECLARE_PLUGIN(CLEOIII_2004_I627327);

}

Rivet analyses

Mass distributions in Ξc− → pK−K−π+

Source code:CLEOIII_2004_I627327.cc

Mass distributions in Ξ_c⁻ → pK⁻K⁻π⁺

Source code:`CLEOIII_2004_I627327.cc`