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The cross-section for the production of two jets in association with aleptonically decaying Z boson ($Zjj$) is measured in proton-proton collisionsat a centre-of-mass energy of 13 TeV, using data recorded with the ATLASdetector at the Large Hadron Collider, corresponding to an integratedluminosity of 3.2 fb$^{-1}$. The electroweak $Zjj$ cross-section is extractedin a fiducial region chosen to enhance the electroweak contribution relative tothe dominant Drell-Yan $Zjj$ process, which is constrained using a data-drivenapproach. The measured fiducial electroweak cross-section is$\sigma^{Zjj}_{EW}= 119\pm 16 (\mathrm{stat.}) \pm 20 (\mathrm{syst.})\pm 2(\mathrm{lumi.})$ for dijet invariant mass greater than 250 GeV, and $34.2\pm5.8 (\mathrm{stat.})\pm 5.5 (\mathrm{syst.})\pm 0.7 (\mathrm{lumi.})$ for dijetinvariant mass greater than 1 TeV. Standard Model predictions are in agreementwith the measurements. The inclusive $Zjj$ cross-section is also measured insix different fiducial regions with varying contributions from electroweak andDrell-Yan $Zjj$ production.

physics letters b

Measurement of the cross-section for electroweak production of dijets in  association with a $Z$ boson in $pp$ collisions at $\sqrt{s}=13$ TeV with the  ATLAS detector