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Measurements of jet activity in top-quark pair events produced inproton--proton collisions are presented, using 3.2 fb$^{-1}$ of $pp$ collisiondata at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment atthe Large Hadron Collider. Events are chosen by requiring an opposite-charge$e\mu$ pair and two $b$-tagged jets in the final state. The normaliseddifferential cross-sections of top-quark pair production are presented asfunctions of additional-jet multiplicity and transverse momentum, $p_{\mathrmT}$. The fraction of signal events that do not contain additional jet activityin a given rapidity region, the gap fraction, is measured as a function of the$p_{\mathrm T}$ threshold for additional jets, and is also presented fordifferent invariant mass regions of the $e\mu b\bar{b}$ system. Allmeasurements are corrected for detector effects and presented as particle-leveldistributions compared to predictions with different theoretical approaches forQCD radiation. While the kinematics of the jets from top-quark decays aredescribed well, the generators show differing levels of agreement with themeasurements of observables that depend on the production of additional jets.

european physical journal. c, particles and fields

Measurement of jet activity produced in top-quark events with an  electron, a muon and two $b$-tagged jets in the final state in $pp$  collisions at $\sqrt{s}=13$ TeV with the ATLAS detector