Rivet analyses

title: MARKI_1979_I133123

Cross section and spectra for $D^0$ 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 $D^0$ and $D^+$ spectra at $\sqrt{s}=7$ GeV

Source code:MARKI_1979_I133123.cc

```c++ // -- 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);

} ```