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## Rivet analyses reference

### ATLAS_2019_I1744201

Z+jet at 8 TeV
Experiment: ATLAS (LHC)
Inspire ID: 1744201
Status: VALIDATED
Authors:
• Aliaksei Hrynevich
• Deepak Kar
References:
Beams: p+ p+
Beam energies: (4000.0, 4000.0) GeV
Run details:
• pp -> Z(ee)+jets at 8 TeV

The inclusive cross-section for jet production in association with a $Z$ boson decaying into an electron-positron pair is measured as a function of the transverse momentum and the absolute rapidity of jets using 19.9 fb$^{-1}$ of $\sqrt{s}=8$ TeV proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider. The measured Z+ jets cross-section is unfolded to the particle level. The cross-section is compared with state-of-the-art Standard Model calculations, including the next-to-leading-order and next-to-next-to-leading-order perturbative QCD calculations, corrected for non-perturbative and QED radiation effects. The results of the measurements cover final-state jets with transverse momenta up to 1 TeV, and show good agreement with fixed-order calculations.

Source code: ATLAS_2019_I1744201.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 67 68 69 70 71 72 73 74 75 76 77 78 79 80 // -*- C++ -*- #include "Rivet/Analysis.hh" #include "Rivet/Projections/FastJets.hh" #include "Rivet/Projections/ZFinder.hh" #include "Rivet/Projections/FinalState.hh" namespace Rivet{ /// @brief: Z+jet at 8 TeV class ATLAS_2019_I1744201 : public Analysis { public: DEFAULT_RIVET_ANALYSIS_CTOR(ATLAS_2019_I1744201); void init() { const FinalState fs(Cuts::abseta < 5.0); Cut cut = Cuts::abseta < 2.47 && Cuts::pT >= 20*GeV; ZFinder zfinder_el(fs, cut, PID::ELECTRON, 66*GeV, 116*GeV, 0.1, ZFinder::ChargedLeptons::PROMPT); declare(zfinder_el, "ZFinder_el"); declare(FastJets(zfinder_el.remainingFinalState(), FastJets::ANTIKT, 0.4, JetAlg::Muons::NONE, JetAlg::Invisibles::NONE), "AKT04"); h_jet_y_pt.resize(6); for (size_t iPtBin=0; iPtBin < h_jet_y_pt.size(); ++iPtBin) { book(h_jet_y_pt[iPtBin], iPtBin+2, 1, 1); } } void analyze(const Event& event) { // electrons selection const ZFinder& zfinder = apply(event, "ZFinder_el"); if ( zfinder.bosons().size() != 1) vetoEvent; const Particles& leptons = zfinder.constituents(); if ( leptons.size() != 2) vetoEvent; if (deltaR(leptons[0], leptons[1]) < 0.2) vetoEvent; // jets selection Jets jets = apply(event, "AKT04").jetsByPt( Cuts::pT > 25*GeV && Cuts::absrap < 3.4 ); idiscardIfAnyDeltaRLess(jets, leptons, 0.4); if (jets.empty()) vetoEvent; // require at least one jet in event for (const Jet& jet : jets) { const double jet_pt = jet.pT() / GeV; for(size_t iPtBin = 0; iPtBin < (ptBins.size() - 1); ++iPtBin) { if (jet_pt >= ptBins[iPtBin] && jet_pt < ptBins[iPtBin+1]) { h_jet_y_pt[iPtBin]->fill(jet.absrap()); } } } } void finalize() { const double norm = crossSection()/femtobarn/sumOfWeights(); for(int iPtBin=0; iPtBin < 6; ++iPtBin){ scale(h_jet_y_pt[iPtBin], norm / ( ptBins[iPtBin+1] - ptBins[iPtBin] )); } } protected: vector ptBins = { 25., 50., 100., 200., 300., 400., 1050. }; private: vector h_jet_y_pt; }; // The hook for the plugin system DECLARE_RIVET_PLUGIN(ATLAS_2019_I1744201); }