Rivet analyses

title: TASSO_1984_I194774

$D_s^\pm$ spectra at 34.7 GeV

Experiment: TASSO (PETRA)

Inspire ID: 194774

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Lett.B 136 (1984) 130-134, 1984

Beams: e+ e-

Beam energies: (17.4, 17.4)GeV

Run details: - e+ e- to hadrons

Measurement of the $D_s^\pm$ spectra at 34.7 GeV by the TASSO experiment, the PDG2020 value of $D^+_s\to\phi\pi^+$ branching ratio is used.

Source code:TASSO_1984_I194774.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/FastJets.hh"

include "Rivet/Projections/FinalState.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief D_s spectrum at 34.7 class TASSO_1984_I194774 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(TASSO_1984_I194774);


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

/// Book histograms and initialise projections before the run
void init() {
  declare(UnstableParticles(), "UFS");
  book(_h_Ds, 1, 1, 1);
}


/// Perform the per-event analysis
void analyze(const Event& event) {
  UnstableParticles ufs = apply<UnstableParticles>(event, "UFS");
  for (const Particle& p : ufs.particles(Cuts::abspid == 431)) {
    double xE = 2. * p.E() / sqrtS();
    Vector3 mom3 = p.p3();
    const double energy = p.E();
    double modp = mom3.mod();
    double beta = modp / energy;
    _h_Ds->fill(xE, 1. / beta);
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  scale(_h_Ds, sqr(sqrtS()) * crossSection() / nanobarn / sumOfWeights());
}

///@}


/// @name Histograms
///@{
Histo1DPtr _h_Ds;
///@}

};

RIVET_DECLARE_PLUGIN(TASSO_1984_I194774);

} ```