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);

}