Rivet analyses

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

namespace Rivet {


  /// @brief J/psi and Upslion production at 8 TeV
  class LHCB_2013_I1230344 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2013_I1230344);


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

    /// Book histograms and initialise projections before the run
    void init() {
      declare(UnstableParticles(), "UFS");
      for (unsigned iy = 0; iy < 2; ++iy) book(_h_Jpsi_y[iy], 2, 1, iy + 1);
      for (unsigned int iy = 0; iy < 3; ++iy) {
        book(_h_Jpsi[iy], {2.0, 2.5, 3.0, 3.5, 4.0, 4.5});
        for (unsigned int ix = 0; ix < 5; ++ix) {
          if (iy < 2)
            book(_h_Jpsi[iy]->bin(ix + 1), 3 + ix, 1, 1 + iy);
          else
            book(_h_Jpsi[iy]->bin(ix + 1), "TMP/Jpsi_" + toString(ix), refData(3 + ix, 1, 1));
        }
      }
      for (unsigned int iy = 0; iy < 3; ++iy) {
        book(_h_Ups_pT[iy], 9, 1, iy + 1);
        book(_h_Ups_y[iy], 10, 1, iy + 1);
        book(_h_Ups_pT_r[iy], "TMP/Ups_pT_" + toString(iy), refData(16, 1, 1));
        book(_h_Ups_y_r[iy], "TMP/Ups_y_" + toString(iy), refData(17, 1, 1));
        book(_h_Ups[iy], {2.0, 2.5, 3.0, 3.5, 4.0, 4.5});
        for (unsigned int ix = 0; ix < 5; ++ix) {
          book(_h_Ups[iy]->bin(ix + 1), 11 + ix, 1, 1 + iy);
        }
      }
    }


    /// 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");
      // J/psi
      for (const Particle& p : ufs.particles(Cuts::pid == 443)) {
        // prompt/non-prompt
        bool nonPrompt = p.fromBottom();
        double absrap = p.absrap();
        double xp = p.perp();
        if (absrap < 2. || absrap > 4.5 || xp > 14.) continue;
        _h_Jpsi_y[nonPrompt]->fill(absrap);
        _h_Jpsi[nonPrompt]->fill(absrap, xp);
        _h_Jpsi[2]->fill(absrap, xp);
      }
      // upsilon
      for (const Particle& p :
           ufs.particles(Cuts::pid == 553 or Cuts::pid == 100553 or Cuts::pid == 200553)) {
        double absrap = p.absrap();
        double xp = p.perp();
        if (absrap < 2. || absrap > 4.5 || xp > 15.) continue;
        unsigned int iups = p.pid() / 100000;
        _h_Ups_pT[iups]->fill(xp);
        _h_Ups_y[iups]->fill(absrap);
        _h_Ups_pT_r[iups]->fill(xp);
        _h_Ups_y_r[iups]->fill(absrap);
        _h_Ups[iups]->fill(absrap, xp);
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      // 1/2 due rapidity folding +/-
      double factor = 0.5 * crossSection() / nanobarn / sumOfWeights();
      // branching ratios for upsilon
      vector<double> br = {0.0248, 0.0193, 0.0218};
      for (unsigned int ix = 0; ix < 2; ++ix) {
        scale(_h_Jpsi_y[ix], factor);
      }
      for (unsigned int ix = 0; ix < 3; ++ix) {
        scale(_h_Ups_pT[ix], factor * br[ix]);
        scale(_h_Ups_y[ix], factor * br[ix]);
        scale(_h_Ups_pT_r[ix], factor * br[ix]);
        scale(_h_Ups_y_r[ix], factor * br[ix]);
        scale(_h_Ups[ix], factor * 1000. * br[ix]);
        divByGroupWidth(_h_Ups[ix]);
        scale(_h_Jpsi[ix], factor);
        divByGroupWidth(_h_Jpsi[ix]);
      }
      for (unsigned int ix = 0; ix < _h_Jpsi[0]->numBins(); ++ix) {
        Estimate1DPtr tmp;
        book(tmp, 3 + ix, 1, 3);
        divide(_h_Jpsi[1]->bin(ix + 1), _h_Jpsi[2]->bin(ix + 1), tmp);
        tmp->scale(100.);
      }
      for (unsigned int ix = 0; ix < 2; ++ix) {
        Estimate1DPtr tmp;
        book(tmp, 16, 1, 1 + ix);
        divide(_h_Ups_pT_r[ix + 1], _h_Ups_pT_r[0], tmp);
        book(tmp, 17, 1, 1 + ix);
        divide(_h_Ups_y_r[ix + 1], _h_Ups_y_r[0], tmp);
      }
    }

    /// @}


    /// @name Histograms
    /// @{
    Histo1DPtr _h_Jpsi_y[2], _h_Ups_pT[3], _h_Ups_y[3], _h_Ups_pT_r[3], _h_Ups_y_r[3];
    Histo1DGroupPtr _h_Jpsi[3], _h_Ups[3];
    /// @}
  };


  RIVET_DECLARE_PLUGIN(LHCB_2013_I1230344);

}