Rivet analyses

Momentum spectrum for Ds+ and Ds*+ at Υ(4S) and nearby continuum

Experiment: BABAR (PEP-II)

Inspire ID: 582184

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Rev. D65 (2002) 091104

Beams: e+ e-

Beam energies: (5.3, 5.3)GeV

Run details: - e+e- > hadrons at Upsilon (4S) and in nearby continuum

Momentum spectrum for Ds+ and Ds*+ at Υ(4S) and nearby continuum measured by BaBar.

Source code:BABAR_2002_I582184.cc

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

namespace Rivet {


  /// @brief D_s D_s* spectrum
  class BABAR_2002_I582184 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(BABAR_2002_I582184);


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

    /// Book histograms and initialise projections before the run
    void init() {
      // Initialise and register projections
      declare(UnstableParticles(), "UFS");
      // Book histograms
      // rates
      book(_c_Ds_on, 2, 1, 1);
      book(_c_Ds_off, 1, 1, 1);
      book(_c_DsStar_on, 2, 1, 2);
      book(_c_DsStar_off, 1, 1, 2);
      book(_w_ups, "/TMP/w_ups");
      // dists
      book(_h_Ds_on, 5, 1, 1);
      book(_h_Ds_off, 3, 1, 2);
      book(_h_DsStar_on, 5, 1, 2);
      book(_h_DsStar_off, 4, 1, 2);
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      // Find the Upsilon(4S) among the unstables
      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
      bool cont = ufs.particles(Cuts::pid == 300553).empty();
      if (!cont) _w_ups->fill();
      for (const Particle& p : ufs.particles(Cuts::abspid == 431 or Cuts::abspid == 433)) {
        double mom = p.momentum().p3().mod();
        if (cont) {
          if (p.abspid() == 431) {
            _h_Ds_off->fill(mom);
            _c_Ds_off->fill("10.58"s);
          }
          else {
            _h_DsStar_off->fill(mom);
            _c_DsStar_off->fill("10.58"s);
          }
        }
        else {
          if (p.abspid() == 431) {
            _h_Ds_on->fill(mom);
            _c_Ds_on->fill();
          }
          else {
            _h_DsStar_on->fill(mom);
            _c_DsStar_on->fill();
          }
        }
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      normalize(_h_Ds_on);
      normalize(_h_Ds_off);
      normalize(_h_DsStar_on);
      normalize(_h_DsStar_off);
      if (_w_ups->val() != 0) {
        scale(_c_Ds_on, 0.5 / *_w_ups);
        scale(_c_DsStar_on, 0.5 / *_w_ups);
      }
      scale(_c_Ds_off, crossSection() / sumOfWeights() / picobarn);
      scale(_c_DsStar_off, crossSection() / sumOfWeights() / picobarn);
    }

    /// @}


    /// @name Histograms
    /// @{
    Histo1DPtr _h_Ds_on, _h_Ds_off, _h_DsStar_on, _h_DsStar_off;
    CounterPtr _c_Ds_on, _c_DsStar_on;
    BinnedHistoPtr<string> _c_Ds_off, _c_DsStar_off;
    CounterPtr _w_ups;
    /// @}
  };


  RIVET_DECLARE_PLUGIN(BABAR_2002_I582184);

}