Cross-section measurements for the production of a -boson in association with high-transverse-momentum jets in $\textit{pp}$ collisions at = 13 TeV with the ATLAS detector

A set of measurements for the production of a -boson in association with high-transverse-momentum jets is presented using 140 fb of proton–proton collision data at a centre-of-mass energy of TeV collected by the ATLAS detector at the LHC. The measurements are performed in final states in which the -boson decays into an electron or muon plus a neutrino and is produced in association with jets with GeV, where the leading jet has GeV. The angular separation between the lepton and the closest jet with GeV is measured and used to define a collinear phase space, wherein measurements of kinematic properties of the -boson and the associated jet are performed. The collinear phase space is populated by dijet events radiating a -boson and events with a -boson produced in association with several jets and it serves as an excellent data sample to probe higher-order theoretical predictions. Measured differential distributions are compared with predictions from state-of-the-art next-to-leading order multi-leg merged Monte Carlo event generators and a fixed-order calculation of the -jet process computed at next-to-next-to-leading order in the strong coupling constant.