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CDF_1998_S3618439

Differential cross-section for events with large total transverse energy
Experiment: CDF (Tevatron Run 1)
Inspire ID: 448075
Status: VALIDATED
Authors:
  • Frank Siegert
References:
  • Phys.Rev.Lett.80:3461-3466,1998
  • 10.1103/PhysRevLett.80.3461
Beams: p- p+
Beam energies: (900.0, 900.0) GeV
Run details:
  • QCD events at Tevatron with $\sqrt{s}=1.8$ TeV without MPI.

Measurement of the differential cross section $\mathrm{d}\sigma/\mathrm{d}E_\perp^j$ for the production of multijet events in $p\bar{p}$ collisions where the sum is over all jets with transverse energy $E_\perp^j > E_\perp^\mathrm{min}$.

Source code: CDF_1998_S3618439.cc
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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"

namespace Rivet {


  /// @brief CDF diff cross-section in events with large missing energy
  class CDF_1998_S3618439 : public Analysis {
  public:

    /// @name Constructors etc.
    //@{

    /// Constructor
    CDF_1998_S3618439()
      : Analysis("CDF_1998_S3618439")
    {    }

    //@}


  public:

    /// @name Analysis methods
    //@{

    /// Book histograms and initialise projections before the run
    void init() {
      FinalState fs(-4.2, 4.2);
      declare(FastJets(fs, FastJets::CDFJETCLU, 0.7), "Jets");

      _h_sumET_20 = bookHisto1D(1, 1, 1);
      _h_sumET_100 = bookHisto1D(1, 1, 2);
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      const double weight = event.weight();

      Jets jets = apply<FastJets>(event, "Jets").jets(Cuts::Et > 20*GeV, cmpMomByEt);
      double sumET_20(0.0), sumET_100(0.0);
      foreach (const Jet& jet, jets) {
        double ET = jet.Et()/GeV;
        sumET_20 += ET;
        if (ET > 100.0) sumET_100 += ET;
      }
      if (sumET_20 > 320.0) _h_sumET_20->fill(sumET_20, weight);
      if (sumET_100 > 320.0) _h_sumET_100->fill(sumET_100, weight);
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      scale(_h_sumET_20, crossSection()/picobarn/sumOfWeights());
      scale(_h_sumET_100, crossSection()/picobarn/sumOfWeights());
    }

    //@}


  private:

    /// @name Histograms
    //@{
    Histo1DPtr _h_sumET_20, _h_sumET_100;
    //@}

  };



  // The hook for the plugin system
  DECLARE_RIVET_PLUGIN(CDF_1998_S3618439);

}