Rivet analyses

title: CMS_2017_I1512296

Prompt and non-prompt J$/\psi$ 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$/\psi$ production at 5.02 TeV by the CMS collaboration. Only the proton-proton results are implemented.

Source code:CMS_2017_I1512296.cc

```c++ // -- 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);

} ```