Rivet analyses

title: ATLAS_2016_I1408878

$D^{*\pm}$, $D^\pm$ and $D^\pm_s$ production at 7 TeV

Experiment: ATLAS (LHC)

Inspire ID: 1408878

Status: VALIDATED

Authors: - Peter Richardson

References: - Nucl.Phys.B 907 (2016) 717-763, 2016. - Expt page: ATLAS-BPHY-2013-04 - arXiv: 1512.02913

Beams: p+ p+

Beam energies: (3500.0, 3500.0)GeV

Run details: - charm meson production

Measurement of the production of $D^{*\pm}$, $D^\pm$ and $D^\pm_s$ production at 7 TeV by the ATLAS collaboration.

Source code:ATLAS_2016_I1408878.cc

```c++ // -- C++ --

include "Rivet/Analysis.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief D meson production at 7 TeV class ATLAS_2016_I1408878 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2016_I1408878);


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

/// Book histograms and initialise projections before the run
void init() {
  // projections
  declare(UnstableParticles(Cuts::abspid == 411 or Cuts::abspid == 413 or Cuts::abspid == 431), "UFS");
  // histograms
  for (unsigned int ix = 0; ix < 3; ++ix) {
    book(_h_tot[ix], "TMP/_total_" + toString(ix + 1), refData(1, 1, 1 + ix));
    book(_e_tot[ix], 1, 1, 1 + ix);
  }
  for (unsigned int ix = 0; ix < 2; ++ix) {
    book(_h_pT[ix], 2, 1, 1 + ix);
    for (unsigned int iy = 0; iy < 2; ++iy) {
      book(_h_y[iy][ix], 3 + ix, 1, 1 + iy);
    }
  }
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  // Final state of unstable particles to get particle spectra
  const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
  for (const Particle& p : ufs.particles()) {
    if (p.children().size() == 1) continue;
    const double abseta = p.abseta();
    if (abseta > 2.1) continue;
    const double pT = p.perp();
    if (pT < 3.5 || pT > 100.) continue;

    unsigned int itype = 0;
    if (p.abspid() == 411)
      itype = 1;
    else if (p.abspid() == 431)
      itype = 2;
    _h_tot[itype]->fill(pT);
    if (itype < 2) {
      _h_pT[itype]->fill(pT);
      if (pT < 20.)
        _h_y[itype][0]->fill(abseta);
      else
        _h_y[itype][1]->fill(abseta);
    }
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  const double factor = crossSection() / microbarn / sumOfWeights();
  for (unsigned int ix = 0; ix < 2; ++ix) {
    scale(_h_tot[ix], factor);
    scale(_h_pT[ix], factor);
    scale(_h_y[ix][0], factor);
    scale(_h_y[ix][1], 1000. * factor);
  }
  scale(_h_tot[2], factor);
  for (unsigned int ix = 0; ix < 3; ++ix) {
    barchart(_h_tot[ix], _e_tot[ix]);
  }
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h_pT[2], _h_y[2][2], _h_tot[3];
Estimate1DPtr _e_tot[3];
/// @}

};

RIVET_DECLARE_PLUGIN(ATLAS_2016_I1408878);

} ```