STAR_2006_S6500200.cc

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// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Tools/Logging.hh"
#include "Rivet/Projections/ChargedFinalState.hh"
#include "Rivet/Projections/IdentifiedFinalState.hh"
#include "Rivet/RivetAIDA.hh"

namespace Rivet {


  /// @brief STAR identified hadron spectra in pp at 200 GeV
  class STAR_2006_S6500200 : public Analysis {
  public:

    /// Constructor
    STAR_2006_S6500200()
      : Analysis("STAR_2006_S6500200"),
        _sumWeightSelected(0.0)
    {  }


    /// Book projections and histograms
    void init() {
      ChargedFinalState bbc1(-5.0,-3.3, 0.0*GeV); // beam-beam-counter trigger
      ChargedFinalState bbc2( 3.3, 5.0, 0.0*GeV); // beam-beam-counter trigger
      addProjection(bbc1, "BBC1");
      addProjection(bbc2, "BBC2");

      IdentifiedFinalState pionfs(-2.5, 2.5, 0.3*GeV);
      IdentifiedFinalState protonfs(-2.5, 2.5, 0.4*GeV);
      pionfs.acceptIdPair(PIPLUS);
      protonfs.acceptIdPair(PROTON);
      addProjection(pionfs, "PIONFS");
      addProjection(protonfs, "PROTONFS");

      _h_pT_piplus     = bookHistogram1D(1, 1, 1);
      _h_pT_piminus    = bookHistogram1D(1, 2, 1);
      _h_pT_proton     = bookHistogram1D(1, 3, 1);
      _h_pT_antiproton = bookHistogram1D(1, 4, 1);
    }


    /// Do the analysis
    void analyze(const Event& event) {
      const ChargedFinalState& bbc1 = applyProjection<ChargedFinalState>(event, "BBC1");
      const ChargedFinalState& bbc2 = applyProjection<ChargedFinalState>(event, "BBC2");
      if (bbc1.size()<1 || bbc2.size()<1) {
        MSG_DEBUG("Failed beam-beam-counter trigger");
        vetoEvent;
      }

      const double weight = event.weight();

      const IdentifiedFinalState& pionfs = applyProjection<IdentifiedFinalState>(event, "PIONFS");
      foreach (const Particle& p, pionfs.particles()) {
        if (fabs(p.momentum().rapidity()) < 0.5) {
          const double pT = p.momentum().pT() / GeV;
          if (p.pdgId()>0) {
            _h_pT_piplus->fill(pT, weight/pT);
          }
          else {
            _h_pT_piminus->fill(pT, weight/pT);
          }
        }
      }

      const IdentifiedFinalState& protonfs = applyProjection<IdentifiedFinalState>(event, "PROTONFS");
      foreach (const Particle& p, protonfs.particles()) {
        if (fabs(p.momentum().rapidity()) < 0.5) {
          const double pT = p.momentum().pT() / GeV;
          if (p.pdgId()>0) {
            _h_pT_proton->fill(pT, weight/pT);
          }
          else {
            _h_pT_antiproton->fill(pT, weight/pT);
          }
        }
      }
      _sumWeightSelected += event.weight();
    }


    /// Finalize
    void finalize() {
      AIDA::IHistogramFactory& hf = histogramFactory();
      const string dir = histoDir();

      hf.divide(dir + "/d02-x01-y01", *_h_pT_piminus, *_h_pT_piplus);
      hf.divide(dir + "/d02-x02-y01", *_h_pT_antiproton, *_h_pT_proton);
      hf.divide(dir + "/d02-x03-y01", *_h_pT_proton, *_h_pT_piplus);
      hf.divide(dir + "/d02-x04-y01", *_h_pT_antiproton, *_h_pT_piminus);

      scale(_h_pT_piplus,     1./(2*M_PI*_sumWeightSelected));
      scale(_h_pT_piminus,    1./(2*M_PI*_sumWeightSelected));
      scale(_h_pT_proton,     1./(2*M_PI*_sumWeightSelected));
      scale(_h_pT_antiproton, 1./(2*M_PI*_sumWeightSelected));
      MSG_DEBUG("sumOfWeights()     = " << sumOfWeights());
      MSG_DEBUG("_sumWeightSelected = " << _sumWeightSelected);
    }


  private:

    double _sumWeightSelected;

    AIDA::IHistogram1D * _h_pT_piplus;
    AIDA::IHistogram1D * _h_pT_piminus;
    AIDA::IHistogram1D * _h_pT_proton;
    AIDA::IHistogram1D * _h_pT_antiproton;
  };



  // The hook for the plugin system
  DECLARE_RIVET_PLUGIN(STAR_2006_S6500200);

}