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CDF_2001_S4517016

Two jet triply-differential cross-section
Experiment: CDF (Tevatron Run 1)
Inspire ID: 538041
Status: VALIDATED
Authors:
  • Frank Siegert
References: Beams: p- p+
Beam energies: (900.0, 900.0) GeV
Run details:
  • Dijet events at Tevatron with $\sqrt{s}=1.8$ TeV

A measurement of the two-jet differential cross section, $\mathrm{d}^3\sigma/\mathrm{d}E_T \, \mathrm{d}\eta_1 \, \mathrm{d}\eta_2$, based on an integrated luminosity of $86 \mathrm{pb}^{-1}$. The differential cross section is measured as a function of the transverse energy, $E_\perp$, of a jet in the pseudorapidity region $0.1 < |\eta_1| < 0.7$ for four different pseudorapidity bins of a second jet restricted to $0.1 < |\eta_2| < 3.0$.

Source code: CDF_2001_S4517016.cc
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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Tools/BinnedHistogram.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"

namespace Rivet {


  /// @brief CDF two-jet triply-differential cross-section
  class CDF_2001_S4517016 : public Analysis {
  public:

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

    /// Constructor
    CDF_2001_S4517016()
      : Analysis("CDF_2001_S4517016")
    {    }

    //@}


  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_ET.addHistogram(0.1, 0.7, bookHisto1D(1, 1, 1));
      _h_ET.addHistogram(0.7, 1.4, bookHisto1D(2, 1, 1));
      _h_ET.addHistogram(1.4, 2.1, bookHisto1D(3, 1, 1));
      _h_ET.addHistogram(2.1, 3.0, bookHisto1D(4, 1, 1));
    }


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

      Jets jets = apply<FastJets>(event, "Jets").jets(Cuts::Et > 10*GeV, cmpMomByEt);
      if (jets.size() < 2) vetoEvent;
      FourMomentum jet1 = jets[0].momentum();
      FourMomentum jet2 = jets[1].momentum();
      double eta1 = jet1.abseta();
      double eta2 = jet2.abseta();
      double ET1 = jet1.Et();
      double ET2 = jet2.Et();
      if (!inRange(eta1, 0.1, 0.7) || ET1 < 40.0*GeV) vetoEvent;
      if (!inRange(eta2, 0.1, 3.0)) vetoEvent;
      _h_ET.fill(eta2, ET1, weight);
      if (eta2<0.7 && ET2>40.0*GeV) _h_ET.fill(eta1, ET2, weight);
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      const double deta1 = 1.2;
      _h_ET.scale(crossSection()/nanobarn/sumOfWeights()/deta1 / 2.0, this);
    }

    //@}


  private:

    /// @name Histograms
    //@{
    BinnedHistogram<double> _h_ET;
    //@}

  };



  // The hook for the plugin system
  DECLARE_RIVET_PLUGIN(CDF_2001_S4517016);

}