Rivet analyses

title: CMS_2011_I885663

Dijet azimuthal decorrelations in $pp$ collisions at $\sqrt{s} = 7$ TeV

Experiment: CMS (LHC)

Inspire ID: 885663

Status: VALIDATED

Authors: - Tomo Umer

References: - Phys. Rev. Lett. 106 (2011) 122003 - arXiv: 1101.5029

Beams: p+ p+

Beam energies: (3500.0, 3500.0)GeV

Run details: - Inclusive QCD at $\sqrt{s} = 7~\TeV$, $\hat{\pT} (or equivalent) greater than 20 GeV

Measurements of dijet azimuthal decorrelations in $pp$ collisions at $\sqrt{s} = 7$ TeV using the CMS detector at the CERN LHC are presented. The analysis is based on an inclusive dijet event sample corresponding to an integrated luminosity of 2.9/pb. Jets are anti-$k_t$ with $R = 0.5$, $p_\perp > 80 (30)$ GeV and $|\eta| < 1.1$.

Source code:CMS_2011_I885663.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/FastJets.hh"

include "Rivet/Projections/FinalState.hh"

namespace Rivet {

/// CMS azimuthal decorrelations class CMS_2011_I885663 : public Analysis { public:

RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2011_I885663);


void init() {
  FinalState fs;
  FastJets akt(fs, JetAlg::ANTIKT, 0.5);
  declare(akt, "antikT");

  book(_h_deltaPhi, {80., 110., 140., 200., 300., 7000.},
       {"d01-x01-y01", "d02-x01-y01", "d03-x01-y01", "d04-x01-y01", "d05-x01-y01"});
}


void analyze(const Event& event) {

  const Jets& jets = apply<JetFinder>(event, "antikT").jetsByPt();
  if (jets.size() < 2) vetoEvent;

  if (fabs(jets[0].eta()) > 1.1 || jets[0].pT() < 80.) vetoEvent;
  if (fabs(jets[1].eta()) > 1.1 || jets[1].pT() < 30.) vetoEvent;

  double dphi = deltaPhi(jets[0].momentum(), jets[1].phi());

  _h_deltaPhi->fill(jets[0].pT(), dphi);
}


void finalize() {
  normalize(_h_deltaPhi);
}

private:

Histo1DGroupPtr _h_deltaPhi;

};

RIVET_DECLARE_ALIASED_PLUGIN(CMS_2011_I885663, CMS_2011_S8950903);

} ```

Aliases: - CMS_2011_S8950903