CDF_1988_S1865951.cc

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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/RivetAIDA.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/TriggerCDFRun0Run1.hh"

namespace Rivet {


  /// @brief CDF track \f$ p_\perp \f$ distributions at 630 and 1800 GeV
  class CDF_1988_S1865951 : public Analysis {
  public:

    /// Constructor
    CDF_1988_S1865951()
      : Analysis("CDF_1988_S1865951")
    {
      setBeams(PROTON, ANTIPROTON);
      setNeedsCrossSection(true);
      _sumWTrig = 0;
    }


    /// @name Analysis methods
    //@{

    /// Book histograms and set up projections
    void init() {
      // Set up projections
      addProjection(TriggerCDFRun0Run1(), "Trigger");
      const ChargedFinalState cfs(-1.0, 1.0, 0.4*GeV);
      addProjection(cfs, "CFS");

      // Book histo
      if (fuzzyEquals(sqrtS()/GeV, 1800, 1E-3)) {
        _hist_pt = bookHistogram1D(1, 1, 1);
      } else if (fuzzyEquals(sqrtS()/GeV, 630, 1E-3)) {
        _hist_pt = bookHistogram1D(2, 1, 1);
      }
    }


    /// Do the analysis
    void analyze(const Event& event) {
      // Trigger
      const bool trigger = applyProjection<TriggerCDFRun0Run1>(event, "Trigger").minBiasDecision();
      if (!trigger) vetoEvent;
      const double weight = event.weight();
      _sumWTrig += weight;

      const FinalState& trackfs = applyProjection<ChargedFinalState>(event, "CFS");
      foreach (Particle p, trackfs.particles()) {
        const double pt = p.momentum().pT()/GeV;
        // Effective weight for d3sig/dp3 = weight / ( Delta eta * 2pi * pt ), with Delta(eta) = 2
        const double eff_weight = weight/(2*2*TWOPI*pt);
        _hist_pt->fill(pt, eff_weight);
      }
    }


    /// Scale histos
    void finalize() {
      scale(_hist_pt, crossSectionPerEvent()/millibarn);
    }

    //@}


  private:

    /// @name Counters
    //@{
    double _sumWTrig;
    //@}

    /// @name Histos
    //@{
    AIDA::IHistogram1D* _hist_pt;
    //@}

  };



  // This global object acts as a hook for the plugin system
  AnalysisBuilder<CDF_1988_S1865951> plugin_CDF_1988_S1865951;

}