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 σEWZjj = 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.
Highlights
The produc tion of Zjj events via t-channel electroweak gauge boson exchange (EW-Zjj events), including the vector-boson fusion (VBF) process shown in Fig. 1(b), is a much rarer process
This Letter presents measurements of the cross-section for EW-Zjj production and in clusive Zjj production at high dijet invariant mass in pp collisions at ^/s = 13 TeV using data corresponding to an integrated luminosity of 3.2 fb-1 collected by the ATLAS detector at the Large Hadron Collider (LHC)
For reconstruction-level studies, total Z boson production rates predicted by all three event generators used to produce QCD-Zjj predictions are normalised using the next-to-next-to-leading-order (NNLO) predictions calcu lated with the FEWZ 3.1 program [29,30,31] using the CT10 NNLO parton distribution function (PDF) set [14]
Summary
This Letter presents measurements of the cross-section for EW-Zjj production and in clusive Zjj production at high dijet invariant mass in pp collisions at ^/s = 13 TeV using data corresponding to an integrated luminosity of 3.2 fb-1 collected by the ATLAS detector at the LHC. These measurements allow the dependence of the cross-section on y/s tion between two objects is defined as AS = y'(A^)2 + (An), where A^ and An are the separations in and n respectively. The increased y/s allows exploration of higher dijet masses, where the EW-Zjj contribution to the total Zjj rate be comes more pronounced
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