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CMS_2017_I1519995

Search for new physics with dijet angular distributions in proton-proton collisions at $\sqrt{s} = 13 \text{TeV}$
Experiment: CMS (CERN LHC)
Inspire ID: 1519995
Status: VALIDATED
Authors:
  • Andreas Hinzmann
References: Beams: p+ p+
Beam energies: (6500.0, 6500.0) GeV
Run details:
  • Hard QCD process with a pT cut of 200 GeV on sub-leading jet is recommended.

Dijet angular distributions are measured in proton-proton collisions at $\sqrt{s}=13 \text{TeV}$, using a data set corresponding to an integrated luminosity of 2.6/fb collected by the CMS detector at the CERN LHC. Dijet angular distributions are found to be in agreement with the perturbative QCD predictions that include electroweak corrections.

Source code: CMS_2017_I1519995.cc
 1// -*- C++ -*-
 2#include "Rivet/Analysis.hh"
 3#include "Rivet/Projections/FastJets.hh"
 4
 5namespace Rivet {
 6
 7
 8  /// Search for new physics with dijet angular distributions at 13 TeV
 9  class CMS_2017_I1519995 : public Analysis {
10  public:
11
12    RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2017_I1519995);
13
14
15    /// Book projections and histograms
16    void init() {
17
18      FastJets antikt(FinalState(), JetAlg::ANTIKT, 0.4);
19      declare(antikt, "ANTIKT");
20
21      book(_h_chi_dijet, {1900., 2400., 3600., 4200., 4800., 8000.});
22      for (auto& b : _h_chi_dijet->bins()) {
23        book(b, _h_chi_dijet->numBins() - b.index() + 1, 1, 1);
24      }
25    }
26
27
28    /// Per-event analysis
29    void analyze(const Event& event) {
30      const Jets& jets = apply<JetFinder>(event, "ANTIKT").jetsByPt();
31      if (jets.size() < 2) vetoEvent;
32
33      const FourMomentum j0(jets[0].mom()), j1(jets[1].mom());
34      if (fabs(j0.rap()+j1.rap())/2 > 1.11) vetoEvent;
35
36      const double mjj = (j0+j1).mass();
37      const double chi = exp(fabs(j0.rap()-j1.rap()));
38      if (chi < 16) _h_chi_dijet->fill(mjj/GeV, chi);
39    }
40
41
42    /// Normalize histograms
43    void finalize() {
44      normalize(_h_chi_dijet);
45    }
46
47
48   Histo1DGroupPtr _h_chi_dijet;
49
50  };
51
52
53  RIVET_DECLARE_PLUGIN(CMS_2017_I1519995);
54
55}