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 √s=13 TeV with the ATLAS detector

Sarah Barnes, Rafal Bielski, Brian Cox, Cinzia Da Via, Nick Dann, Giulio Forcolin, Alessandra Forti, Julia Iturbe Ponce, Xingguo Li, Frederick Loebinger, Stephen Marsden, Jiri Masik, Stephen Menary, Francisca Munoz Sanchez, Thomas Neep, Alexander Oh, Rustem Ospanov, Rustem Ospanov, Joleen Pater, Yvonne PetersAndrew Pilkington, Arnaud Pin, Darren Price, Yang Qin, John Raine, Rhys Roberts, Savanna Shaw, Lee Tomlinson, Stephen Watts, Fabian Wilk, Martin Woudstra, Terence Wyatt, The ATLAS Collaboration

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    Abstract

    Measurements of jet activity in top-quark pair events produced in proton–proton collisions are presented, using 3.2 fb −1 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 eμ 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, pT . 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 pT threshold for additional jets, and is also presented for different invariant mass regions of the eμbb¯ 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.
    Original languageEnglish
    JournalEuropean Physical Journal C. Particles and Fields
    Volume77
    Issue number220
    Early online date7 Apr 2017
    DOIs
    Publication statusPublished - 7 Apr 2017

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