Measurement of the Cross-Section for Electroweak Production of Dijets in Association with a Z Boson in pp Collisions at √s=13 TeV with the ATLAS Detector

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Abstract

The cross-section for the production of two jets in association with a leptonically decaying Z boson (Zjj) is measured in proton-proton collisions at a centre-of-mass energy of 13 TeV, using data recorded with the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 3.2 fb⁻¹. The electroweak Zjj cross-section is extracted in a fiducial region chosen to enhance the electroweak contribution relative to the dominant Drell-Yan Zjj process, which is constrained using a data-driven approach. The measured fiducial electroweak cross-section is σ(Zjj)(EW) = 119 ±16 (stat.) ± 20 (syst.) ± 2 (lumi.) fb for dijet invariant mass greater than 250 GeV, and 34.2 ± 5.8 (stat.) ± 5.5 (syst.) ± 0.7 (lumi.) fb for dijet invariant mass greater than 1 TeV. Standard Model predictions are in agreement with the measurements. The inclusive Zjj cross-section is also measured in six different fiducial regions with varying contributions from electroweak and Drell-Yan Zjj production. © 2017 The Author(s). Published by Elsevier B.V.

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Keywords

Partons, Large Hadron Collider (France and Switzerland), Jets (Nuclear physics), Z bosons, Proton-proton interactions, Electroweak interactions

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Rights

CC BY 4.0 (Attribution), ©2017 The Authors

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