Rivet analyses

title: LHCB_2019_I1720859

Measurement of b-hadron fractions in 13 TeV pp collisions

Experiment: LHCB (LHC)

Inspire ID: 1720859

Status: VALIDATED

Authors: - Markus Seidel

References: - Expt page: LHCb-PAPER-2018-050 - Phys. Rev. D 100 (2019) 3, 031102 - arXiv: 1902.06794

Beams: p+ p+

Beam energies: (6500.0, 6500.0)GeV

Run details: - Minimum bias or low-pt bbbar events

The production fractions of $\overline{B}^0_s$ and $\Lambda^0_b$ hadrons, normalized to the sum of $B^-$ and $\overline{B}^0$ fractions, are measured in 13 TeV pp collisions using data collected by the LHCb experiment, corresponding to an integrated luminosity of 1.67/fb.

Source code:LHCB_2019_I1720859.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief Measurement of b-hadron fractions in 13 TeV pp collisions class LHCB_2019_I1720859 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2019_I1720859);

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

/// Book histograms and initialise projections before the run
void init() {
  // Unstable particles
  const UnstableParticles up(
      Cuts::absetaIn(2, 5) && Cuts::ptIn(4. * GeV, 25. * GeV)
      && (Cuts::abspid == 511 || Cuts::abspid == 521 || Cuts::abspid == 531 || Cuts::abspid == 5122));
  declare(up, "up");

  // Book temp histograms
  book(_h["Bx"], "TMP/Bx", refData(1, 1, 1));
  book(_h["Bs"], "TMP/Bs", refData(1, 1, 1));
  book(_h["Lb"], "TMP/Lb", refData(1, 1, 1));
  // Bs and Lb ratios to B mesons
  book(_s["BsRatio"], 1, 1, 1);
  book(_s["LbRatio"], 1, 1, 2);
}

/// Perform the per-event analysis
void analyze(const Event& event) {

  const UnstableParticles& up = apply<UnstableParticles>(event, "up");

  // Fill histograms with B hadron pTs
  for (const Particle& p : up.particles()) {
    if (p.abspid() == 521 || p.abspid() == 511)
      _h["Bx"]->fill(p.pT() / GeV);
    else if (p.abspid() == 531)
      _h["Bs"]->fill(p.pT() / GeV);
    else if (p.abspid() == 5122)
      _h["Lb"]->fill(p.pT() / GeV);
  }
}

/// Normalise histograms etc., after the run
void finalize() {
  divide(_h["Bs"], _h["Bx"], _s["BsRatio"]);
  divide(_h["Lb"], _h["Bx"], _s["LbRatio"]);
}

/// @}

/// @name Histograms
/// @{
map<string, Histo1DPtr> _h;
map<string, Estimate1DPtr> _s;
/// @}

};

RIVET_DECLARE_PLUGIN(LHCB_2019_I1720859); } ```