Rivet analyses

title: CMS_2011_I889175

Dijet angular distributions and search for quark compositeness in $pp$ collisions at $\sqrt{s} = 7$ TeV

Experiment: CMS (LHC)

Inspire ID: 889175

Status: VALIDATED

Authors: - A. Hinzmann

References: - Phys.Rev.Lett.106:201804,2011 - DOI: 10.1103/PhysRevLett.106.201804 - arXiv: 1102.2020

Beams: p+ p+

Beam energies: (3500.0, 3500.0)GeV

Run details: - QCD dijet events

Measurement of dijet angular distributions in proton-proton collisions at a center-of-mass energy of 7 TeV. The data sample, collected with single jet triggers, has a total integrated luminosity of 36 pb$^{-1}$, with jets being reconstructed using the anti-$k_t$ clustering algorithm with $R=0.5$. The data are presented for the variable $\chi$ defined as $\chi = \exp(|y_1 - y_2|)$ where $y_1$ and $y_2$ are the rapidities of the two leading (highest $\pT$) jets.'

Source code:CMS_2011_I889175.cc

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

include "Rivet/Analysis.hh"

include "Rivet/Projections/FastJets.hh"

namespace Rivet {

/// Dijet angular distributions and search for quark compositeness at 7 TeV class CMS_2011_I889175 : public Analysis { public:

RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2011_I889175);


void init() {

  FinalState fs;
  FastJets antikt(fs, JetAlg::ANTIKT, 0.5);
  declare(antikt, "ANTIKT");

  book(_h_chi_dijet, {250., 350., 500., 650., 850., 1100., 1400., 1800., 2200., 7000.});
  for (auto& b : _h_chi_dijet->bins()) {
    book(b, _h_chi_dijet->numBins() - b.index() + 1, 1, 1);
  }
}


void analyze(const Event& event) {
  const Jets& jets = apply<JetFinder>(event, "ANTIKT").jetsByPt();
  if (jets.size() < 2) vetoEvent;
  FourMomentum j0(jets[0].momentum());
  FourMomentum j1(jets[1].momentum());
  double y0 = j0.rapidity();
  double y1 = j1.rapidity();
  if (fabs(y0 + y1) / 2. > 1.11) vetoEvent;
  double mjj = FourMomentum(j0 + j1).mass();
  double chi = exp(fabs(y0 - y1));
  if (chi < 16.) _h_chi_dijet->fill(mjj, chi);
}


void finalize() {
  normalize(_h_chi_dijet);
}

private:

Histo1DGroupPtr _h_chi_dijet;

};

RIVET_DECLARE_ALIASED_PLUGIN(CMS_2011_I889175, CMS_2011_S8968497);

} ```

Aliases: - CMS_2011_S8968497