Rivet analyses

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

namespace Rivet {


  /// @brief Upsilon production at 7,8 TeV
  class LHCB_2015_I1392456 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2015_I1392456);


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

    /// Book histograms and initialise projections before the run
    void init() {
      declare(UnstableParticles(), "UFS");

      for (double eVal : allowedEnergies()) {
        const int en = int(eVal + 0.5);
        if (isCompatibleWithSqrtS(eVal)) _sqs = en;

        int ih = en == 7000 ? 0 : 10;
        for (size_t iups = 0; iups < 3; ++iups) {
          book(_h_Ups[en + iups], {2.0, 2.5, 3.0, 3.5, 4.0, 4.5});
          for (size_t iy = 0; iy < 5; ++iy) {
            book(_h_Ups[en + iups]->bin(iy + 1), 1 + iups + ih, 1, 1 + iy);
          }
          book(_h_Ups_pT[en + iups], 4 + ih, 1, 1 + iups);
          book(_h_Ups_y[en + iups], 5 + ih, 1, 1 + iups);
        }
      }
      raiseBeamErrorIf(_sqs == 0);
    }


    /// 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");
      for (const Particle& p :
           ufs.particles(Cuts::pid == 553 or Cuts::pid == 100553 or Cuts::pid == 200553)) {
        const double absrap = p.absrap();
        const double xp = p.perp();
        if (absrap < 2.0 || absrap > 4.5) continue;
        unsigned int iups = p.pid() / 100000;
        _h_Ups_pT[_sqs + iups]->fill(xp);
        if (xp < 30.) _h_Ups_y[_sqs + iups]->fill(absrap);
        _h_Ups[_sqs + iups]->fill(absrap, xp);
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      // 1/2 due rapidity folding +/-
      const double factor = 0.5 * crossSection() / picobarn / sumOfWeights();
      // branching ratios for upsilon
      vector<double> br = {0.0248, 0.0193, 0.0218};

      for (double eVal : allowedEnergies()) {
        const int en = int(eVal + 0.5);
        for (size_t iups = 0; iups < 3; ++iups) {
          scale(_h_Ups_pT[en + iups], factor * br[iups]);
          scale(_h_Ups_y[en + iups], factor / 1000. * br[iups]);
          scale(_h_Ups[en + iups], factor * br[iups]);
          divByGroupWidth(_h_Ups[en + iups]);
        }
        size_t ih = en == 8000 ? 10 : 0;
        for (size_t ix = 0; ix < _h_Ups[en + 0]->numBins(); ++ix) {
          Estimate1DPtr tmp;
          book(tmp, 6 + ih, 1, 1 + ix);
          divide(_h_Ups[en + 1]->bin(ix + 1), _h_Ups[en + 0]->bin(ix + 1), tmp);
          book(tmp, 7 + ih, 1, 1 + ix);
          divide(_h_Ups[en + 2]->bin(ix + 1), _h_Ups[en + 0]->bin(ix + 1), tmp);
          book(tmp, 8 + ih, 1, 1 + ix);
          divide(_h_Ups[en + 2]->bin(ix + 1), _h_Ups[en + 1]->bin(ix + 1), tmp);
        }
        for (size_t iups = 1; iups < 3; ++iups) {
          Estimate1DPtr tmp;
          book(tmp, 9 + ih, 1, iups);
          divide(_h_Ups_pT[en + iups], _h_Ups_pT[en + 0], tmp);
          book(tmp, 10 + ih, 1, iups);
          divide(_h_Ups_y[en + iups], _h_Ups_y[en + 0], tmp);
        }
        Estimate1DPtr tmp;
        book(tmp, 9 + ih, 1, 3);
        divide(_h_Ups_pT[en + 2], _h_Ups_pT[en + 1], tmp);
        book(tmp, 10 + ih, 1, 3);
        divide(_h_Ups_y[en + 2], _h_Ups_y[en + 1], tmp);
      }
    }

    /// @}


    /// @name Histograms
    /// @{
    map<int, Histo1DPtr> _h_Ups_pT, _h_Ups_y;
    map<int, Histo1DGroupPtr> _h_Ups;
    int _sqs = 0;
    /// @}
  };


  RIVET_DECLARE_PLUGIN(LHCB_2015_I1392456);

}