%0 Journal Article %T 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 root s=13TeV with the ATLAS detector %A ATLAS Collaboration (Aaboud, M. et al %A Alvarez Piqueras, D. %A Barranco Navarro, L. %A Cabrera Urban, S. %A Castillo Gimenez, V. %A Cerda Alberich, L. %A Costa, M. J. %A Fernandez Martinez, P. %A Ferrer, A. %A Fiorini, L. %A Fuster, J. %A Garcia, C. %A Garcia Navarro, J. E. %A Gonzalez de la Hoz, S. %A Higon-Rodriguez, E. %A Jimenez Pena, J. %A King, M. %A Lacasta, C. %A Mamuzic, J. %A Marti-Garcia, S. %A Melini, D. %A Mitsou, V. A. %A Pedraza Lopez, S. %A Rodriguez Rodriguez, D. %A Romero Adam, E. %A Ros, E. %A Salt, J. %A Sanchez Martinez, V. %A Soldevila, U. %A Sanchez, J. %A Valero, A. %A Valls Ferrer, J. A. %A Vos, M. %J European Physical Journal C %D 2017 %V 77 %N 4 %I Springer %@ 1434-6044 %G English %F ATLASCollaborationAaboud_etal2017 %O WOS:000399244600001 %O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=3105), last updated on Thu, 18 May 2017 15:44:00 +0000 %X Measurements of jet activity in top-quark pair events produced in proton-proton collisions are presented, using 3.2 fb of pp collision data at a centre-of-mass energy of 13 TeV collected by the ATLAS experiment at the Large Hadron Collider. Events are chosen by requiring an opposite-charge pair and two b-tagged jets in the final state. The normalised differential cross-sections of top-quark pair production are presented as functions of additional-jet multiplicity and transverse momentum, . The fraction of signal events that do not contain additional jet activity in a given rapidity region, the gap fraction, is measured as a function of the threshold for additional jets, and is also presented for different invariant mass regions of the system. All measurements are corrected for detector effects and presented as particle-level distributions compared to predictions with different theoretical approaches for QCD radiation. While the kinematics of the jets from top-quark decays are described well, the generators show differing levels of agreement with the measurements of observables that depend on the production of additional jets. %R 10.1140/epjc/s10052-017-4766-0 %U http://arxiv.org/abs/1610.09978 %U https://doi.org/10.1140/epjc/s10052-017-4766-0 %P 220-38pp