Rivet analyses

Prompt and non-prompt J/ψ production at 5.02 TeV

Experiment: CMS (LHC)

Inspire ID: 1512296

Status: VALIDATED

Authors: - Peter Richardson

References: - Eur.Phys.J.C 77 (2017) 4, 269 - arXiv: 1702.01462 - Expt page: CMS-HIN-14-009

Beams: p+ p+

Beam energies: (2510.0, 2510.0)GeV

Run details: - hadronic events with J/psi production

Measurement of the double differential cross section for prompt and non-prompt J/ψ production at 5.02 TeV by the CMS collaboration. Only the proton-proton results are implemented.

Source code:CMS_2017_I1512296.cc

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

namespace Rivet {


  /// @brief J/psi at 5.02 TeV
  class CMS_2017_I1512296 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2017_I1512296);


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

    /// Book histograms and initialise projections before the run
    void init() {
      declare(UnstableParticles(), "UFS");
      // histograms
      for (int ix = 0; ix < 2; ++ix) {
        book(_h_JPsi_pT[ix], {-2.4, -1.93, -1.5, -0.9, 0., 0.9, 1.5, 1.93, 2.4});
        for (int iy = 0; iy < 8; ++iy) {
          Histo1DPtr tmp;
          if (iy < 4) {
            book(_h_JPsi_pT[ix]->bin(iy + 1), 2 + 13 * ix, 1, 4 - iy);
          }
          else {
            book(_h_JPsi_pT[ix]->bin(iy + 1), 1 + 13 * ix, 1, 8 - iy);
          }
        }
      }
      for (unsigned int ix = 0; ix < 2; ++ix) {
        book(_h_JPsi_y[ix], {6.5, 10., 30.});
        for (auto& b : _h_JPsi_y[ix]->bins()) {
          book(b, 5 + 13 * ix, 1, b.index());
        }
      }
    }


    /// 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 == 443)) {
        // prompt/non-prompt
        bool nonPrompt = p.fromBottom();
        const double rap = p.rap();
        const double xp = p.perp();
        _h_JPsi_pT[nonPrompt]->fill(rap, xp);
        _h_JPsi_y[nonPrompt]->fill(xp, rap);
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      // br to muons PDG 2021
      const double br = 0.05961;
      const double factor = br * crossSection() / microbarn / sumOfWeights();
      const vector<double> pTbins = {6.5, 10., 30.};
      for (unsigned int ix = 0; ix < 2; ++ix) {
        scale(_h_JPsi_pT[ix], factor);
        divByGroupWidth(_h_JPsi_pT[ix]);
        // in y just single differential, don't divide by group width
        scale(_h_JPsi_y[ix], factor);
      }
    }

    /// @}


    /// @name Histograms
    /// @{
    Histo1DGroupPtr _h_JPsi_pT[2], _h_JPsi_y[2];
    /// @}
  };


  RIVET_DECLARE_PLUGIN(CMS_2017_I1512296);

}