Rivet analyses

Dijet azimuthal decorrelations

Experiment: ATLAS (LHC)

Inspire ID: 889546

Status: VALIDATED

Authors: - Frank Siegert

References: - Expt page: ATLAS-STDM-2010-13 - arXiv: 1102.2696

Beams: p+ p+

Beam energies: (3500.0, 3500.0)GeV

Run details: - pp QCD interactions at 7000 GeV. The distributions are binned in leading pT starting at 110 GeV with the last bin starting at 800 GeV.

Dijet azimuthal decorrelation measured by ATLAS at 7 TeV. Jets are anti-kt with R = 0.6, p⟂ > 100~GeV, |η| < 0.8. The analysis is binned in leading jet p⟂ bins. All data is fully corrected for detector effects.

Source code:ATLAS_2011_I889546.cc

// -*- C++ -*-
#include "Rivet/Analysis.hh"
#include "Rivet/Projections/FinalState.hh"
#include "Rivet/Projections/FastJets.hh"

namespace Rivet {


  class ATLAS_2011_I889546 : public Analysis {
  public:

    /// Constructor
    RIVET_DEFAULT_ANALYSIS_CTOR(ATLAS_2011_I889546);


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

    /// Book histograms and initialise projections before the run
    void init() {
      /// Initialise and register projections
      declare(FastJets(FinalState(), JetAlg::ANTIKT, 0.6), "AntiKtJets06");

      /// Book histograms
      book(_h_deltaPhi, {110., 160., 210., 260., 310., 400., 500., 600., 800., 10000.});
      for (auto& b : _h_deltaPhi->bins()) {
        book(b, 1, 1, b.index());
      }
    }


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

      Jets jets06 = apply<FastJets>(event, "AntiKtJets06").jetsByPt(Cuts::absrap < 2.8 && Cuts::pT > 100*GeV);
      if (jets06.size()>1){
        if (jets06[0].absrap()<0.8 && jets06[1].absrap()<0.8) {
          double observable = mapAngle0ToPi(jets06[0].phi()-jets06[1].phi()) / M_PI;
          _h_deltaPhi->fill(jets06[0].pT(), observable);
        }
      }
    }


    /// Normalise histograms etc., after the run
    void finalize() {
      normalize(_h_deltaPhi, 1.0/M_PI);
    }

    /// @}


  private:

    /// Histograms
    Histo1DGroupPtr _h_deltaPhi;

  };



  RIVET_DECLARE_ALIASED_PLUGIN(ATLAS_2011_I889546, ATLAS_2011_S8971293);

}

Aliases: - ATLAS_2011_S8971293