Rivet analyses

title: CMS_2011_I914325

$B_s^0$ production at 7 TeV

Experiment: CMS (LHC)

Inspire ID: 914325

Status: VALIDATED

Authors: - Peter Richardson

References: - Phys.Rev.D 84 (2011) 052008 - arXiv: 1106.4048 - Expt page: CMS-BPH-10-013

Beams: p+ p+

Beam energies: (3500.0, 3500.0)GeV

Run details: - hadronic events

Differential cross section in $p_\perp$ and rapidity for $B^0_s$ production at 7 TeV

Source code:CMS_2011_I914325.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/UnstableParticles.hh"

namespace Rivet {

/// @brief B_s production at 7 TeV class CMS_2011_I914325 : public Analysis { public:

/// Constructor
RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2011_I914325);


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

/// Book histograms and initialise projections before the run
void init() {
  // projection
  declare(UnstableParticles(), "UFS");
  // histograms
  book(_h_sigma, 1, 1, 1);
  book(_h_pT, 2, 1, 1);
  book(_h_y, 3, 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)) {
    // skip copies due mixing
    if (p.children().size() == 1 && p.children()[0].abspid() == 531) continue;
    // rapidity and pT
    const double y = p.absrap();
    if (y > 2.4) continue;
    const double pT = p.perp();
    if (pT < 8. || pT > 50.) continue;
    _h_sigma->fill(29.);
    _h_pT->fill(pT);
    _h_y->fill(y);
  }
}


/// Normalise histograms etc., after the run
void finalize() {
  // br for J/psi phi (PDG 2021)
  const double br = 1.08e-3;
  // 0.5 from particle/antiparticle
  const double fact = 0.5 * br * crossSection() / nanobarn / sumOfWeights();
  // remove the bin width as total cross section
  scale(_h_sigma, fact * 42.);
  // normal differential cross sections
  scale(_h_pT, fact);
  scale(_h_y, fact);
}

/// @}


/// @name Histograms
/// @{
Histo1DPtr _h_sigma, _h_pT, _h_y;
/// @}

};

RIVET_DECLARE_PLUGIN(CMS_2011_I914325);

} ```