Rivet analyses

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

namespace Rivet {


  /// @brief Quarkonium prouction at 13 TeV
  class CMS_2018_I1633431 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2018_I1633431);


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

    /// Book histograms and initialise projections before the run
    void init() {
      // projection
      declare(UnstableParticles(), "UFS");
      // J/psi/psi(2s) histos
      for (unsigned int ix = 1; ix < 3; ++ix) {
        book(_h_onium[ix - 1], {0., 0.3, 0.6, 0.9, 1.2});
        for (unsigned int iy = 1; iy < 5; ++iy) {
          Histo1DPtr tmp;
          book(_h_onium[ix - 1]->bin(iy), ix, 1, iy);
        }
        book(_h_total[ix - 1], ix, 1, 5);
      }
      // Upsilon
      for (unsigned int ix = 3; ix < 6; ++ix) {
        book(_h_onium[ix - 1], {0., 0.6, 1.2});
        for (unsigned int iy = 1; iy < 3; ++iy) {
          book(_h_onium[ix - 1]->bin(iy), ix, 1, iy);
        }
        book(_h_total[ix - 1], ix, 1, 3);
      }
      // histos for ratios
      for (unsigned int ix = 0; ix < 5; ++ix) {
        if (ix < 2) {
          book(_h_ratio[ix], "TMP/h_ratio_" + to_str(ix), refData(11, 1, 1));
        }
        else {
          book(_h_ratio[ix], "TMP/h_ratio_" + to_str(ix), refData(12, 1, 1));
        }
      }
    }


    /// Perform the per-event analysis
    void analyze(const Event& event) {
      // Final state of unstable particles to get particle spectra
      const UnstableParticles& ufs = apply<UnstableParticles>(event, "UFS");
      // loop over onium states
      for (const Particle& p : ufs.particles(Cuts::pid == 553 or Cuts::pid == 100553 or Cuts::pid == 200553
                                             or Cuts::pid == 443 or Cuts::pid == 100443)) {
        // cuts on pT and rapidity
        const double y = p.absrap();
        const double pT = p.perp();
        if (y > 1.2 || pT < 20.) continue;
        unsigned int itype(0);
        if (p.pid() == 443)
          itype = 0;
        else if (p.pid() == 100443)
          itype = 1;
        else if (p.pid() == 553)
          itype = 2;
        else if (p.pid() == 100553)
          itype = 3;
        else if (p.pid() == 200553)
          itype = 4;
        // for J/pis and psi(2s) check if prompt
        if (itype <= 1 && p.fromBottom()) continue;
        _h_onium[itype]->fill(y, pT);
        _h_total[itype]->fill(pT);
        _h_ratio[itype]->fill(pT);
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      // 0.5 due folded rapidity
      const double factor = 0.5 * crossSection() / picobarn / sumOfWeights();
      // branching ratios to muons
      const vector<double> brs = {0.05961, 0.00793, 0.0248, 0.0191, 0.0218};
      for (unsigned int ix = 0; ix < 5; ++ix) {
        scale(_h_onium[ix], factor * brs[ix]);
        divByGroupWidth(_h_onium[ix]);
        scale(_h_total[ix], brs[ix] * factor / 1.2);
        scale(_h_ratio[ix], brs[ix] * factor / 1.2);
      }
      // ratio plots
      Estimate1DPtr tmp;
      book(tmp, 11, 1, 1);
      divide(_h_ratio[1], _h_ratio[0], tmp);
      for (unsigned int ix = 0; ix < 2; ++ix) {
        book(tmp, 12, 1, 1 + ix);
        divide(_h_ratio[3 + ix], _h_ratio[2], tmp);
      }
    }

    ///@}


    /// @name Histograms
    ///@{
    Histo1DGroupPtr _h_onium[5];
    Histo1DPtr _h_total[5];
    Histo1DPtr _h_ratio[5];
    ///@}
  };


  RIVET_DECLARE_PLUGIN(CMS_2018_I1633431);

}