Rivet analyses

Spectrum for Ωc0 production at the Υ(4S)

Experiment: BABAR (PEP-II)

Inspire ID: 746745

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Rev.Lett. 99 (2007) 062001

Beams: e+ e-

Beam energies: (5.3, 5.3)GeV

Run details: - e+e- > hadrons at Upsilon(4S) including both resonant and non-resonance

Spectrum for Ωc0 production at the Υ(4S) measured by BaBar. The spectrum includes a contribution from both the Υ(4S) and continuum cc̄ events.

Source code:BABAR_2007_I746745.cc

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

namespace Rivet {


  /// @brief Spectrum for Omega_c
  class BABAR_2007_I746745 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2007_I746745);


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

    /// Book histograms and initialise projections before the run
    void init() {
      declare(UnstableParticles(), "UFS");
      book(_h_p, 1, 1, 1);
      book(_b, 2, 1, 1);
      book(_r, 3, 1, 1);
      book(_ups, "/TMP/ups");
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      static const int idOmega = 4332;
      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
      bool ups = !ufs.particles(Cuts::pid == 300553).empty();
      if (ups) _ups->fill();
      for (const Particle& p : ufs.particles(Cuts::abspid == idOmega)) {
        _h_p->fill(p.momentum().p3().mod());
        if (p.children().size() == 2) {
          int sign = p.pid() / p.abspid();
          if ((p.children()[0].pid() == sign * 3334 && p.children()[1].pid() == sign * 211)
              || (p.children()[1].pid() == sign * 3334 && p.children()[0].pid() == sign * 211)) {
            if (ups)
              _b->fill();
            else
              _r->fill("10.58"s);
          }
        }
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      normalize(_h_p);
      if (_ups->effNumEntries() != 0) {
        scale(_b, 0.5 / *_ups);
      }
      scale(_r, crossSection() / sumOfWeights() / femtobarn);
    }
    /// @}


    /// @name Histograms
    /// @{
    Histo1DPtr _h_p;
    BinnedHistoPtr<string> _r;
    CounterPtr _b, _ups;
    /// @}
  };


  RIVET_DECLARE_PLUGIN(BABAR_2007_I746745);

}