Rivet analyses

title: DELCO_1985_I205132

$D^{*+}$ spectrum at 29 GeV

Experiment: DELCO (PEP)

Inspire ID: 205132

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Rev.Lett. 54 (1985) 522-525

Beams: e+ e-

Beam energies: (14.5, 14.5)GeV

Run details: - e+ e- > hadrons

Measurement of the $D^{*+}$ spectrum in $e^+e^-$ collisions at $\sqrt{s}=29$ GeV

Source code:DELCO_1985_I205132.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief D* +/- production at 29 GeV class DELCO_1985_I205132 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(DELCO_1985_I205132);


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

/// Book histograms and initialise projections before the run
void init() {
  // Initialise and register projections
  declare(UnstableParticles(Cuts::abspid == 413), "UFS");
  //Histograms
  for (unsigned int ix = 0; ix < 2; ++ix) book(_h[ix], 1, 1, 1 + ix);
  book(_r, 2, 1, 1);
}


/// 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 xp = p.p3().mod() / sqrt(0.25 * sqr(sqrtS()) - p.mass2());
    if (xp > 0.3) _r->fill(29);
    _h[0]->fill(xp);
    if (!p.fromBottom()) _h[1]->fill(xp);
  }
}


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

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h[2];
BinnedHistoPtr<int> _r;
/// @}

};

RIVET_DECLARE_PLUGIN(DELCO_1985_I205132);

} ```