Rivet analyses

// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {


  /// @brief Charged particle multplicity in Upsilon 4s decays
  class CLEOII_1999_I504672 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(CLEOII_1999_I504672);


    /// @name Analysis methods
    /// @{

    /// Book histograms and initialise projections before the run
    void init() {

      // Initialise and register projections
      declare(UnstableParticles(), "UFS");

      // Book histograms
      book(_n_tot, 1, 1, 1);
      book(_n_lep, 1, 1, 2);
      book(_n_nolep, 1, 1, 3);
      book(_h_n, 2, 1, 1);
      book(_n_Ups_All, "/TMP/n_Ups_All");
      book(_n_Ups_Lep, "/TMP/n_Ups_Lep");
      book(_n_Ups_NoLep, "/TMP/n_Ups_NoLep");
    }

    void findChildren(const Particle& p, int& nCharged, int& nLep) {
      bool isBottom = PID::isBottomHadron(p.pid());
      for (const Particle& child : p.children()) {
        if (child.children().empty()) {
          if (PID::isCharged(child.pid())) ++nCharged;
          if (isBottom && (child.abspid() == 11 || child.abspid() == 13)) ++nLep;
        }
        else {
          findChildren(child, nCharged, nLep);
        }
      }
    }

    /// Perform the per-event analysis
    void analyze(const Event& event) {
      for (const Particle& p : apply<FinalState>(event, "UFS").particles(Cuts::pid == 300553)) {
        _n_Ups_All->fill();
        int nCharged(0), nLep(0);
        findChildren(p, nCharged, nLep);
        _h_n->fill(nCharged);
        _n_tot->fill(Ecm, nCharged);
        if (nLep == 2) {
          _n_lep->fill(Ecm, nCharged);
          _n_Ups_Lep->fill();
        }
        else {
          _n_nolep->fill(Ecm, nCharged);
          _n_Ups_NoLep->fill();
        }
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      scale(_h_n, 1. / *_n_Ups_All);
      scale(_n_tot, 1. / *_n_Ups_All);
      scale(_n_lep, 1. / *_n_Ups_Lep);
      scale(_n_nolep, 1. / *_n_Ups_NoLep);
    }

    /// @}


    /// @name Histograms
    /// @{
    Histo1DPtr _h_n;
    BinnedHistoPtr<string> _n_tot, _n_lep, _n_nolep;
    CounterPtr _n_Ups_All, _n_Ups_Lep, _n_Ups_NoLep;
    const string Ecm = "10.6";

    /// @}
  };


  RIVET_DECLARE_PLUGIN(CLEOII_1999_I504672);

}