Rivet analyses

title: ARGUS_1995_I397794

Spectrum for $D_{s2}^+$ 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 $D_{s2}^+$ production at 10.58 GeV measured by ARGUS.

Source code:ARGUS_1995_I397794.cc

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

} ```