Rivet analyses referenceCMS_2011_I889175Dijet angular distributions and search for quark compositeness in $pp$ collisions at $\sqrt{s} = 7$ TeVExperiment: CMS (LHC) Inspire ID: 889175 Status: VALIDATED Authors:
Beam energies: (3500.0, 3500.0) GeV Run details:
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 $p_\perp$) jets.' Source code: CMS_2011_I889175.cc 1// -*- C++ -*-
2#include "Rivet/Analysis.hh"
3#include "Rivet/Projections/FastJets.hh"
4
5namespace Rivet {
6
7
8 /// Dijet angular distributions and search for quark compositeness at 7 TeV
9 class CMS_2011_I889175 : public Analysis {
10 public:
11
12 RIVET_DEFAULT_ANALYSIS_CTOR(CMS_2011_I889175);
13
14
15 void init() {
16
17 FinalState fs;
18 FastJets antikt(fs, JetAlg::ANTIKT, 0.5);
19 declare(antikt, "ANTIKT");
20
21 book(_h_chi_dijet, {250., 350., 500., 650., 850., 1100., 1400., 1800., 2200., 7000.});
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 void analyze(const Event& event) {
29 const Jets& jets = apply<JetFinder>(event, "ANTIKT").jetsByPt();
30 if (jets.size() < 2) vetoEvent;
31 FourMomentum j0(jets[0].momentum());
32 FourMomentum j1(jets[1].momentum());
33 double y0 = j0.rapidity();
34 double y1 = j1.rapidity();
35 if (fabs(y0+y1)/2. > 1.11) vetoEvent;
36 double mjj = FourMomentum(j0+j1).mass();
37 double chi = exp(fabs(y0-y1));
38 if(chi<16.) _h_chi_dijet->fill(mjj, chi);
39 }
40
41
42 void finalize() {
43 normalize(_h_chi_dijet);
44 }
45
46
47 private:
48
49 Histo1DGroupPtr _h_chi_dijet;
50
51 };
52
53
54
55 RIVET_DECLARE_ALIASED_PLUGIN(CMS_2011_I889175, CMS_2011_S8968497);
56
57}
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