Rivet analyses

title: D0_2010_I846483

Dijet invariant mass

Experiment: D0 (Tevatron Run 2)

Inspire ID: 846483

Status: VALIDATED

Authors: - Frank Siegert

References: - arXiv: 1002.4594

Beams: p- p+

Beam energies: (980.0, 980.0)GeV

Run details: - $p \bar{p} \to$ jets at 1960 GeV. Analysis needs two hard jets above 40 GeV.

The inclusive dijet production double differential cross section as a function of the dijet invariant mass and of the largest absolute rapidity ($|y|\text{max}$) of the two jets with the largest transverse momentum in an event is measured using 0.7 fb$^{-1}$ of data. The measurement is performed in six rapidity regions up to $|y|\text{max}=2.4$.

Source code:D0_2010_I846483.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/FastJets.hh"

include "Rivet/Projections/FinalState.hh"

namespace Rivet {

/// D0 dijet invariant mass measurement class D0_2010_I846483 : public Analysis { public:

RIVET_DEFAULT_ANALYSIS_CTOR(D0_2010_I846483);


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

/// Book histograms and initialise projections before the run
void init() {

  FinalState fs;
  FastJets conefinder(fs, JetAlg::D0ILCONE, 0.7);
  declare(conefinder, "ConeFinder");

  book(_h_m_dijet, {0., 0.4, 0.8, 1.2, 1.6, 2., 2.4});
  for (auto& b : _h_m_dijet->bins()) {
    book(b, b.index(), 1, 1);
  }
}


/// Perform the per-event analysis
void analyze(const Event& e) {
  const Jets& jets = apply<JetFinder>(e, "ConeFinder").jetsByPt(Cuts::pT > 40.0 * GeV);
  if (jets.size() < 2) vetoEvent;

  const double ymax = std::max(jets[0].absrap(), jets[1].absrap());
  const double mjj = FourMomentum(jets[0].mom() + jets[1].mom()).mass();

  _h_m_dijet->fill(ymax, mjj / TeV);
}


/// Normalise histograms etc., after the run
void finalize() {
  scale(_h_m_dijet, crossSection() / picobarn / sumOfWeights());
  divByGroupWidth(_h_m_dijet);
}

/// @}

private:

/// @name Histograms
/// @{
Histo1DGroupPtr _h_m_dijet;
/// @}

};

RIVET_DECLARE_ALIASED_PLUGIN(D0_2010_I846483, D0_2010_S8566488);

} ```

Aliases: - D0_2010_S8566488