UA5_1988_S1867512.cc

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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/RivetAIDA.hh"
#include "Rivet/Tools/Logging.hh"
#include "Rivet/Math/MathUtils.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/Beam.hh"
#include "Rivet/Projections/TriggerUA5.hh"

namespace Rivet {


  /// @brief UA5 charged particle correlations at 200, 546 and 900 GeV
  class UA5_1988_S1867512 : public Analysis {
  public:

    UA5_1988_S1867512() : Analysis("UA5_1988_S1867512")
    {
      setBeams(PROTON, ANTIPROTON);
      _sumWPassed = 0;
    }


    /// @name Analysis methods
    //@{

    void init() {
      // Projections
      addProjection(TriggerUA5(), "Trigger");

      // Symmetric eta interval
      addProjection(ChargedFinalState(-0.5, 0.5), "CFS05");

      // Asymmetric intervals first
      // Forward eta intervals
      addProjection(ChargedFinalState(0.0, 1.0), "CFS10F");
      addProjection(ChargedFinalState(0.5, 1.5), "CFS15F");
      addProjection(ChargedFinalState(1.0, 2.0), "CFS20F");
      addProjection(ChargedFinalState(1.5, 2.5), "CFS25F");
      addProjection(ChargedFinalState(2.0, 3.0), "CFS30F");
      addProjection(ChargedFinalState(2.5, 3.5), "CFS35F");
      addProjection(ChargedFinalState(3.0, 4.0), "CFS40F");

      // Backward eta intervals
      addProjection(ChargedFinalState(-1.0,  0.0), "CFS10B");
      addProjection(ChargedFinalState(-1.5, -0.5), "CFS15B");
      addProjection(ChargedFinalState(-2.0, -1.0), "CFS20B");
      addProjection(ChargedFinalState(-2.5, -1.5), "CFS25B");
      addProjection(ChargedFinalState(-3.0, -2.0), "CFS30B");
      addProjection(ChargedFinalState(-3.5, -2.5), "CFS35B");
      addProjection(ChargedFinalState(-4.0, -3.0), "CFS40B");

      // Histogram booking, we have sqrt(s) = 200, 546 and 900 GeV
      if (fuzzyEquals(sqrtS()/GeV, 200.0, 1E-4)) {
        _hist_correl = bookProfile1D(2, 1, 1);
        _hist_correl_asym = bookProfile1D(3, 1, 1);
      } else if (fuzzyEquals(sqrtS()/GeV, 546.0, 1E-4)) {
        _hist_correl = bookProfile1D(2, 1, 2);
        _hist_correl_asym = bookProfile1D(3, 1, 2);
      } else if (fuzzyEquals(sqrtS()/GeV, 900.0, 1E-4)) {
        _hist_correl = bookProfile1D(2, 1, 3);
        _hist_correl_asym = bookProfile1D(3, 1, 3);
      }
    }


    void analyze(const Event& event) {
      // Trigger
      const bool trigger = applyProjection<TriggerUA5>(event, "Trigger").nsdDecision();
      if (!trigger) vetoEvent;
      _sumWPassed += event.weight();

      // Count forward/backward particles
      n_10f += applyProjection<ChargedFinalState>(event, "CFS10F").size();
      n_15f += applyProjection<ChargedFinalState>(event, "CFS15F").size();
      n_20f += applyProjection<ChargedFinalState>(event, "CFS20F").size();
      n_25f += applyProjection<ChargedFinalState>(event, "CFS25F").size();
      n_30f += applyProjection<ChargedFinalState>(event, "CFS30F").size();
      n_35f += applyProjection<ChargedFinalState>(event, "CFS35F").size();
      n_40f += applyProjection<ChargedFinalState>(event, "CFS40F").size();
      //
      n_10b += applyProjection<ChargedFinalState>(event, "CFS10B").size();
      n_15b += applyProjection<ChargedFinalState>(event, "CFS15B").size();
      n_20b += applyProjection<ChargedFinalState>(event, "CFS20B").size();
      n_25b += applyProjection<ChargedFinalState>(event, "CFS25B").size();
      n_30b += applyProjection<ChargedFinalState>(event, "CFS30B").size();
      n_35b += applyProjection<ChargedFinalState>(event, "CFS35B").size();
      n_40b += applyProjection<ChargedFinalState>(event, "CFS40B").size();
      //
      n_05 += applyProjection<ChargedFinalState>(event, "CFS05").size();
    }


    void finalize() {
      // The correlation strength is defined in formulas
      // 4.1 and 4.2

      // Fill histos, gap width histo comes first
      _hist_correl->fill(0.0, correlation(n_10f, n_10b));
      _hist_correl->fill(1.0, correlation(n_15f, n_15b));
      _hist_correl->fill(2.0, correlation(n_20f, n_20b));
      _hist_correl->fill(3.0, correlation(n_25f, n_25b));
      _hist_correl->fill(4.0, correlation(n_30f, n_30b));
      _hist_correl->fill(5.0, correlation(n_35f, n_35b));
      _hist_correl->fill(6.0, correlation(n_40f, n_40b));

      // Fill gap-center histo (Fig 15)
      //
      // The first bin contains all the c_str strengths of
      // the gap size histo above, since the corresponding
      // 'center of the separating gap' is always at eta=0
      _hist_correl_asym->fill(0.0, correlation(n_10f, n_10b));
      _hist_correl_asym->fill(0.0, correlation(n_15f, n_15b));
      _hist_correl_asym->fill(0.0, correlation(n_20f, n_20b));
      _hist_correl_asym->fill(0.0, correlation(n_25f, n_25b));
      _hist_correl_asym->fill(0.0, correlation(n_30f, n_30b));
      _hist_correl_asym->fill(0.0, correlation(n_35f, n_35b));
      _hist_correl_asym->fill(0.0, correlation(n_40f, n_40b));
      // Fill in correlation strength for assymetric intervals,
      // see Tab. 5
      _hist_correl_asym->fill(0.5, correlation(n_25f, n_15b));
      _hist_correl_asym->fill(1.0, correlation(n_30f, n_10b));
      _hist_correl_asym->fill(1.5, correlation(n_35f, n_05 ));
      _hist_correl_asym->fill(2.0, correlation(n_40f, n_10f));

      // TODO: find out what exactly n_F and n_B are in the
      // asymmetric case. It's important for the definition
      // of b (see Eq. 4.2)
      //_hist_correl_asym->fill(0.5, correlation(n_15b, n_25f));
      //_hist_correl_asym->fill(1.0, correlation(n_10b, n_30f));
      //_hist_correl_asym->fill(1.5, correlation(n_05 , n_35f));
      //_hist_correl_asym->fill(2.0, correlation(n_10f, n_40f));

    }

    //@}


  private:

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


    /// @name Vectors for storing the number of particles in the different eta intervals per event.
    /// @todo Is there a better way?
    //@{
    std::vector<int> n_10f;
    std::vector<int> n_15f;
    std::vector<int> n_20f;
    std::vector<int> n_25f;
    std::vector<int> n_30f;
    std::vector<int> n_35f;
    std::vector<int> n_40f;
    //
    std::vector<int> n_10b;
    std::vector<int> n_15b;
    std::vector<int> n_20b;
    std::vector<int> n_25b;
    std::vector<int> n_30b;
    std::vector<int> n_35b;
    std::vector<int> n_40b;
    //
    std::vector<int> n_05;
    //@}


    /// @name Histograms
    //@{
    // Symmetric eta intervals
    AIDA::IProfile1D *_hist_correl;
    // For asymmetric eta intervals
    AIDA::IProfile1D *_hist_correl_asym;
    //@}

  };



  // This global object acts as a hook for the plugin system
  AnalysisBuilder<UA5_1988_S1867512> plugin_UA5_1988_S1867512;

}