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JADE_1979_I142874

Charged hadron multiplicity
Experiment: JADE (PETRA)
Inspire ID: 142874
Status: VALIDATED
Authors:
  • Peter Richardson
References:
  • Phys.Lett. B88 (1979) 171-176, 1979
Beams: e- e+
Beam energies: (11.0, 11.0); (13.8, 13.8); (15.0, 15.0); (15.8, 15.8) GeV
Run details:
  • e+e- to hadrons

Charged hadrom multiplcity at a range of energies, use with care as its not clear if $K_S^0$ decays are included of not, within the systematic error of 1.5

Source code: JADE_1979_I142874.cc
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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/ChargedFinalState.hh"

namespace Rivet {


  /// @brief Add a short analysis description here
  class JADE_1979_I142874 : public Analysis {
  public:

    /// Constructor
    DEFAULT_RIVET_ANALYSIS_CTOR(JADE_1979_I142874);


    /// @name Analysis methods
    //@{

    /// Book histograms and initialise projections before the run
    void init() {

      // Initialise and register projections
      declare(ChargedFinalState(), "FS");

      // Book histograms
      book(_nHadrons, "TMP/hadrons");

    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      const ChargedFinalState& fs = apply<ChargedFinalState>(event, "FS");
      _nHadrons->fill(fs.particles().size());

    }


    /// Normalise histograms etc., after the run
    void finalize() {
      double sigma = _nHadrons->val()/sumOfWeights();
      double error = _nHadrons->err()/sumOfWeights();
      Scatter2D temphisto(refData(2, 1, 1));
      Scatter2DPtr mult;
      book(mult, 2, 1, 1);
      for (size_t b = 0; b < temphisto.numPoints(); b++) {
	const double x  = temphisto.point(b).x();
	pair<double,double> ex = temphisto.point(b).xErrs();
	pair<double,double> ex2 = ex;
	if(ex2.first ==0.) ex2. first=0.0001;
	if(ex2.second==0.) ex2.second=0.0001;
	if (inRange(sqrtS()/GeV, x-ex2.first, x+ex2.second)) {
	  mult->addPoint(x, sigma, ex, make_pair(error,error));
	}
	else {
	  mult->addPoint(x, 0., ex, make_pair(0.,.0));
	}
      }
    }
    //@}


    /// @name Histograms
    //@{
    CounterPtr _nHadrons;
    //@}


  };


  // The hook for the plugin system
  DECLARE_RIVET_PLUGIN(JADE_1979_I142874);


}