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We present measurements of cross-sections for production of a leptonicallydecaying $Z$ boson in association with a large-radius jet in 13 TeVproton-proton collisions at the LHC, using $36~\mathrm{fb}^{-1}$ of data fromthe ATLAS detector. Integrated and differential cross-sections are measured atparticle-level in both a flavor-inclusive and a doubly $b$-tagged fiducialphase-space. The large-radius jet mass and transverse momentum, its kinematicrelationship to the $Z$ boson, and the angular separation of $b$-taggedsmall-radius track-jets within the large-radius jet are measured. Thismeasurement constitutes an important test of perturbative quantumchromodynamics in kinematic and flavor configurations relevant to several Higgsboson and beyond-Standard-Model physics analyses. The results highlight issueswith modeling of additional hadronic activity in the flavor-inclusiveselection, and a distinction between flavor-number schemes in the $b$-taggedphase-space.

physical review. d/physical review. d.

Measurement of cross-sections for production of a $Z$ boson in  association with a flavor-inclusive or doubly $b$-tagged large-radius jet in  proton-proton collisions at $\sqrt{s} = 13$ TeV with the ATLAS experiment