Rivet analyses

title: LHCB_2013_I1215607

$B_s^0$ fraction at 7 TeV

Experiment: LHCB (LHC)

Inspire ID: 1215607

Status: VALIDATED NOHEPDATA

Authors: - Peter Richardson

References: - JHEP 04 (2013) 001

Beams: p+ p+

Beam energies: (3500.0, 3500.0)GeV

Run details: - bottom hadron production

Measurement of the fraction of $B_s^0$ production at 7 TeV by the LHCb collaboration.

Source code:LHCB_2013_I1215607.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief B_s fracion at 7 TeV class LHCB_2013_I1215607 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(LHCB_2013_I1215607);


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

/// Book histograms and initialise projections before the run
void init() {
  declare(UnstableParticles(), "UFS");
  for (unsigned int ix = 0; ix < 2; ++ix) {
    book(_h_pT[ix], "TMP/h_pT_" + toString(ix), refData(1, 1, 1));
    book(_h_y[ix], "TMP/h_y_" + toString(ix), refData(2, 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 == 531 || Cuts::abspid == 511)) {
    // skip copies due mixing
    if (p.children().size() == 1 && p.children()[0].abspid() == p.abspid()) continue;
    double eta = p.abseta();
    if (eta < 2. || eta > 5.) continue;
    double pT = p.perp();
    if (pT < 1.5 || pT > 40.) continue;
    if (p.abspid() == 531) {
      _h_pT[0]->fill(pT);
      _h_y[0]->fill(eta);
    }
    else {
      _h_pT[1]->fill(pT);
      _h_y[1]->fill(eta);
    }
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  Estimate1DPtr tmp;
  book(tmp, 1, 1, 1);
  divide(_h_pT[0], _h_pT[1], tmp);
  book(tmp, 2, 1, 1);
  divide(_h_y[0], _h_y[1], tmp);
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h_pT[2], _h_y[2];
/// @}

};

RIVET_DECLARE_PLUGIN(LHCB_2013_I1215607);

} ```