Rivet analyses

title: CMS_2020_I1738943

Inclusive $\Lambda_c^+$ production at 5.02 TeV

Experiment: CMS (LHC)

Inspire ID: 1738943

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Lett.B 803 (2020) 135328 - Expt page: CMS-HIN-18-009 - arXiv: 1906.03322

Beams: p+ p+

Beam energies: (2510.0, 2510.0)GeV

Run details: - hadronic events

Differential cross section in $p_\perp$ for inclusive $\Lambda_c^+$ production at 5.02 TeV.

Source code:CMS_2020_I1738943.cc

```c++ // -- C++ --

include "Rivet/Analysis.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief Lambda_c+ at 5.02 TeV class CMS_2020_I1738943 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2020_I1738943);


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

/// Book histograms and initialise projections before the run
void init() {
  // projection
  declare(UnstableParticles(), "UFS");
  // histograms
  book(_h_Lambda, 1, 1, 1);
  book(_h_D, "TMP/h_D", refData(4, 1, 1));
}


/// 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::abspid == 4122 || Cuts::abspid == 421)) {
    // skip copies due mixing
    if (p.children().size() == 1 && p.children()[0].abspid() == p.abspid()) continue;
    if (p.absrap() > 1.) continue;
    const double pT = p.perp();
    if (p.abspid() == 4122) {
      _h_Lambda->fill(pT);
    }
    else {
      _h_D->fill(pT);
    }
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  // 0.5 from particle/antiparticle
  const double fact = 0.5 * crossSection() / microbarn / sumOfWeights();
  scale(_h_Lambda, fact);
  scale(_h_D, fact);
  Estimate1DPtr tmp;
  book(tmp, 4, 1, 1);
  divide(_h_Lambda, _h_D, tmp);
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h_Lambda, _h_D;
/// @}

};

RIVET_DECLARE_PLUGIN(CMS_2020_I1738943);

} ```