Rivet analyses

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

namespace Rivet {


  /// @brief J/psi and psi(2S) at 7 TeV
  class CMS_2012_I944755 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2012_I944755);


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

    /// Book histograms and initialise projections before the run
    void init() {
      declare(UnstableParticles(), "UFS");
      // J/psi/psi(2s) histos
      for (unsigned int ipsi = 0; ipsi < 2; ++ipsi) {
        for (unsigned int iprompt = 0; iprompt < 2; ++iprompt) {
          book(_h_pT[ipsi][iprompt], "TMP/pT_" + toString(ipsi) + "_" + toString(iprompt),
               refData(20, 1, 1 + iprompt));
        }
        const vector<double> raps = ipsi == 0 ? vector<double>({0., 0.9, 1.2, 1.6, 2.1, 2.4})
                                              : vector<double>({0., 1.2, 1.6, 2.4});
        for (unsigned int iprompt = 0; iprompt < 3; ++iprompt) {
          book(_h_psi[ipsi][iprompt], raps);
          if (ipsi == 1 && iprompt < 2) {
            book(_h_ratio[0][iprompt], raps);
            book(_h_ratio[1][iprompt], raps);
          }
          for (unsigned int iy = 1; iy < raps.size(); ++iy) {
            if (iprompt < 2) {
              book(_h_psi[ipsi][iprompt]->bin(iy), iy + 5 * ipsi, 1, 1 + iprompt);
            }
            else {
              book(_h_psi[ipsi][iprompt]->bin(iy), "TMP/psi_" + toString(ipsi) + "_" + toString(iy),
                   refData(iy + 5 * ipsi, 1, 1));
            }
            if (iprompt < 2 && ipsi == 1) {
              book(_h_ratio[0][iprompt]->bin(iy), "TMP/ratio_0_" + toString(iprompt) + "_" + toString(iy),
                   refData(16 + iy, 1, 1 + iprompt));
              book(_h_ratio[1][iprompt]->bin(iy), "TMP/ratio_1_" + toString(iprompt) + "_" + toString(iy),
                   refData(16 + iy, 1, 1 + iprompt));
            }
          }
        }
      }
    }


    /// 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 == 443 || Cuts::pid == 100443)) {
        // cuts on rapidity
        const double y = p.absrap();
        if (y > 2.4) continue;
        const double pT = p.perp();
        // prompt
        unsigned int iprompt = p.fromBottom();
        unsigned int ipsi = p.pid() / 100000;
        _h_psi[ipsi][iprompt]->fill(y, pT);
        _h_psi[ipsi][2]->fill(y, pT);
        _h_ratio[ipsi][iprompt]->fill(y, pT);
        _h_pT[ipsi][iprompt]->fill(pT);
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      // 0.5 due folded rapidity
      const double factor = 0.5 * crossSection() / nanobarn / sumOfWeights();
      // branching ratios to muons
      const vector<double> brs = {0.05961, 0.00793};
      for (unsigned int ipsi = 0; ipsi < 2; ++ipsi) {
        for (unsigned int iprompt = 0; iprompt < 2; ++iprompt) {
          scale(_h_psi[ipsi][iprompt], factor * brs[ipsi]);
          divByGroupWidth(_h_psi[ipsi][iprompt]);
          scale(_h_ratio[ipsi][iprompt], factor * brs[ipsi]);
          divByGroupWidth(_h_ratio[ipsi][iprompt]);
          scale(_h_pT[ipsi][iprompt], factor * brs[ipsi]);
        }
        scale(_h_psi[ipsi][2], factor * brs[ipsi]);
        divByGroupWidth(_h_psi[ipsi][2]);
      }
      // ratios psi(2S) over J/psi
      for (unsigned int iprompt = 0; iprompt < 2; ++iprompt) {
        for (unsigned int iy = 0; iy < _h_ratio[0][iprompt]->numBins(); ++iy) {
          Estimate1DPtr tmp;
          book(tmp, 17 + iy, 1, 1 + iprompt);
          divide(_h_ratio[1][iprompt]->bin(1 + iy), _h_ratio[0][iprompt]->bin(1 + iy), tmp);
        }
        Estimate1DPtr tmp;
        book(tmp, 20, 1, 1 + iprompt);
        divide(_h_pT[1][iprompt], _h_pT[0][iprompt], tmp);
      }
      // non-prompt fraction
      for (unsigned int ipsi = 0; ipsi < 2; ++ipsi) {
        for (unsigned int iy = 0; iy < _h_psi[ipsi][1]->numBins(); ++iy) {
          Estimate1DPtr tmp;
          book(tmp, 21 + iy + 5 * ipsi, 1, 1);
          efficiency(_h_psi[ipsi][1]->bin(1 + iy), _h_psi[ipsi][2]->bin(1 + iy), tmp);
        }
      }
    }

    /// @}


    /// @name Histograms
    /// @{
    Histo1DGroupPtr _h_psi[2][3];
    Histo1DGroupPtr _h_ratio[2][2];
    Histo1DPtr _h_pT[2][2];
    /// @}
  };


  RIVET_DECLARE_PLUGIN(CMS_2012_I944755);

}