Rivet analyses

title: LHCB_2018_I1670013

Differential cross sections for $\Upsilon(1,2,3S)$ production at 13 TeV

Experiment: LHCB (LHC)

Inspire ID: 1670013

Status: VALIDATED

Authors: - Peter Richardson

References: - JHEP 07 (2018) 134 - JHEP 05 (2019) 076 (erratum)

Beams: p+ p+

Beam energies: (6500.0, 6500.0)GeV

Run details: - hadronic events with Upsilon production

Measurement of the double differential (in $p_\perp$ and $y$) cross section for $\Upsilon(1,2,3S)$ production at 13 TeV by the LHCB collaboration.

Source code:LHCB_2018_I1670013.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief Upslion production at 13 TeV class LHCB_2018_I1670013 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2018_I1670013);


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

/// Book histograms and initialise projections before the run
void init() {
  declare(UnstableParticles(), "UFS");
  for (unsigned int iups = 0; iups < 3; ++iups) {
    book(_h_Ups[iups], {2.0, 2.5, 3.0, 3.5, 4.0, 4.5});
    for (unsigned int iy = 0; iy < 5; ++iy) {
      book(_h_Ups[iups]->bin(iy + 1), 1 + iups, 1, 1 + iy);
    }
    book(_h_Ups_pT[iups], 4, 1, 1 + iups);
    book(_h_Ups_y[iups], 5, 1, 1 + iups);
    book(_h_Ups_pT_r[iups], "TMP/Ups_pT_" + toString(iups), refData(8, 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");
  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) continue;
    unsigned int iups = p.pid() / 100000;
    _h_Ups_pT[iups]->fill(xp);
    _h_Ups_pT_r[iups]->fill(xp);
    if (xp < 15.) _h_Ups_y[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() / picobarn / sumOfWeights();
  // branching ratios for upsilon
  vector<double> br = {0.0248, 0.0193, 0.0218};
  for (unsigned int iups = 0; iups < 3; ++iups) {
    scale(_h_Ups_pT[iups], factor * br[iups]);
    scale(_h_Ups_y[iups], factor * br[iups]);
    scale(_h_Ups_pT_r[iups], factor * br[iups]);
    scale(_h_Ups[iups], factor * br[iups]);
    divByGroupWidth(_h_Ups[iups]);
  }
  for (unsigned int iups = 1; iups < 3; ++iups) {
    for (unsigned int ix = 0; ix < _h_Ups[0]->numBins(); ++ix) {
      Estimate1DPtr tmp;
      book(tmp, 5 + iups, 1, 1 + ix);
      divide(_h_Ups[iups]->bin(ix + 1), _h_Ups[0]->bin(ix + 1), tmp);
    }
    Estimate1DPtr tmp;
    book(tmp, 8, 1, iups);
    divide(_h_Ups_pT_r[iups], _h_Ups_pT_r[0], tmp);
    book(tmp, 9, 1, iups);
    divide(_h_Ups_y[iups], _h_Ups_y[0], tmp);
  }
}

/// @}


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

};

RIVET_DECLARE_PLUGIN(LHCB_2018_I1670013);

} ```