Rivet analyses

Cross section and spectra for D0 and D+ spectra at $\sqrt{s}=7$ GeV

Experiment: MARKI (PEP)

Inspire ID: 133123

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Lett.B 84 (1979) 507-510

Beams: e+ e-

Beam energies: (3.5, 3.5)GeV

Run details: - e+ e- > hadrons

Cross section and spectra for D0 and D+ spectra at $\sqrt{s}=7$ GeV

Source code:MARKI_1979_I133123.cc

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

namespace Rivet {


  /// @brief D0 D+ and 7 GeV
  class MARKI_1979_I133123 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(MARKI_1979_I133123);

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

    /// Book histograms and initialise projections before the run
    void init() {
      // Initialise and register projections
      declare(UnstableParticles(Cuts::abspid == 411 || Cuts::abspid == 421), "UFS");
      //Histograms
      for (unsigned int ix = 0; ix < 2; ++ix) {
        book(_h_sigma[ix], 1, 1, 1 + ix);
        for (unsigned int iy = 0; iy < 2; ++iy) book(_h_spect[ix][iy], 3 + iy, 1, 1 + ix);
      }
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
      for (const Particle& p : ufs.particles()) {
        const double xE = 2. * p.E() / sqrtS();
        unsigned int iloc = p.abspid() == 421 ? 0 : 1;
        _h_sigma[iloc]->fill(sqrtS());
        for (unsigned int iy = 0; iy < 2; ++iy) {
          _h_spect[iloc][iy]->fill(xE);
        }
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      for (unsigned int ix = 0; ix < 2; ++ix) {
        scale(_h_sigma[ix], 1.8 * crossSection() / nanobarn / sumOfWeights());
        for (unsigned int iy = 0; iy < 2; ++iy)
          scale(_h_spect[ix][iy], sqr(sqrtS()) * crossSection() / microbarn / sumOfWeights());
      }
    }

    /// @}


    /// @name Histograms
    /// @{
    Histo1DPtr _h_sigma[2], _h_spect[2][2];
    /// @}
  };


  RIVET_DECLARE_PLUGIN(MARKI_1979_I133123);

}