Rivet analyses

Spectrum for Ds2+ production at 10.58 GeV

Experiment: ARGUS (DORIS)

Inspire ID: 397794

Status: VALIDATED

Authors: - Peter Richardson

References: - Z.Phys. C69 (1996) 405-408

Beams: e+ e-

Beam energies: (5.3, 5.3)GeV

Run details: - e+e- to hadrons

Spectrum for Ds2+ production at 10.58 GeV measured by ARGUS.

Source code:ARGUS_1995_I397794.cc

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

namespace Rivet {


  /// @brief Spectrum for D_s2+
  class ARGUS_1995_I397794 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(ARGUS_1995_I397794);


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

    /// Book histograms and initialise projections before the run
    void init() {
      // projections
      declare(Beam(), "Beams");
      declare(UnstableParticles(), "UFS");
      // book histos
      book(_h_rate1, 1, 1, 1);
      book(_h_rate2, 1, 2, 1);
      book(_h_x, 2, 1, 1);
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      static const int idDs2 = 435;
      // Get beams and average beam momentum
      const ParticlePair& beams = apply<Beam>(event, "Beams").beams();
      const double Emax = (beams.first.p3().mod() + beams.second.p3().mod()) / 2.0;
      const double Pmax = sqrt(sqr(Emax) - sqr(2.625));
      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
      for (const Particle& p : ufs.particles(Cuts::abspid == idDs2)) {
        double xp = p.momentum().p3().mod() / Pmax;
        _h_x->fill(xp);
        int sign = p.pid() / p.abspid();
        if (p.children().size() != 2) continue;
        if (p.children()[0].pid() == sign * 421 && p.children()[1].pid() == sign * 321) {
          _h_rate1->fill(xp);
          _h_rate2->fill(xp);
        }
        else if (p.children()[1].pid() == sign * 421 && p.children()[0].pid() == sign * 321) {
          _h_rate1->fill(xp);
          _h_rate2->fill(xp);
        }
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      normalize(_h_x);
      scale(_h_rate1, 0.3 * crossSection() / sumOfWeights() / picobarn);
      scale(_h_rate2, crossSection() / sumOfWeights() / picobarn);
    }

    /// @}


    /// @name Histograms
    /// @{
    Histo1DPtr _h_x, _h_rate1, _h_rate2;
    /// @}
  };


  RIVET_DECLARE_PLUGIN(ARGUS_1995_I397794);

}