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## Rivet analyses reference

### CMS_2011_S8968497

Measurement of 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:
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 $p_\perp$) jets.'

Source code: CMS_2011_S8968497.cc
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/FastJets.hh" #include "Rivet/Tools/BinnedHistogram.hh" namespace Rivet { class CMS_2011_S8968497 : public Analysis { public: CMS_2011_S8968497() : Analysis("CMS_2011_S8968497") { } void init() { FinalState fs; FastJets antikt(fs, FastJets::ANTIKT, 0.5); declare(antikt, "ANTIKT"); _h_chi_dijet.addHistogram(2200., 7000., bookHisto1D(1, 1, 1)); _h_chi_dijet.addHistogram(1800., 2200., bookHisto1D(2, 1, 1)); _h_chi_dijet.addHistogram(1400., 1800., bookHisto1D(3, 1, 1)); _h_chi_dijet.addHistogram(1100., 1400., bookHisto1D(4, 1, 1)); _h_chi_dijet.addHistogram( 850., 1100., bookHisto1D(5, 1, 1)); _h_chi_dijet.addHistogram( 650., 850., bookHisto1D(6, 1, 1)); _h_chi_dijet.addHistogram( 500., 650., bookHisto1D(7, 1, 1)); _h_chi_dijet.addHistogram( 350., 500., bookHisto1D(8, 1, 1)); _h_chi_dijet.addHistogram( 250., 350., bookHisto1D(9, 1, 1)); } void analyze(const Event& event) { const double weight = event.weight(); const Jets& jets = apply(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, weight); } void finalize() { foreach (Histo1DPtr hist, _h_chi_dijet.getHistograms()) { normalize(hist); } } private: BinnedHistogram _h_chi_dijet; }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(CMS_2011_S8968497); }