The European Physical Journal C > 2017 > 77 > 4 > 1-38
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 $$\sqrt{s}=13$$ s = 13 TeV with the ATLAS detector
Source
Abstract
Measurements of jet activity in top-quark pair events produced in proton–proton collisions are presented, using 3.2 fb $$^{-1}$$ - 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 $$e\mu $$ e μ 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, $$p_{\text {T}}$$ p T . 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 $$p_{\text {T}}$$ p T threshold for additional jets, and is also presented for different invariant mass regions of the $$e\mu b\bar{b}$$ e μ b b ¯ 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.
Identifiers
journal ISSN : | 1434-6044 |
journal e-ISSN : | 1434-6052 |
DOI | 10.1140/epjc/s10052-017-4766-0 |