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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
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0001-6945-1916
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
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Number of Authors: 28472017 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 77, no 4Article in journal (Refereed) Published
Abstract [en]

Measurements of jet activity in top-quark pair events produced in proton–proton collisions are presented, using 3.2 fb- 1of 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 pTthreshold 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.

Place, publisher, year, edition, pages
Springer, 2017. Vol. 77, no 4
National Category
Subatomic Physics
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URN: urn:nbn:se:kth:diva-207952DOI: 10.1140/epjc/s10052-017-4766-0ISI: 000399244600001Scopus ID: 2-s2.0-85017197839OAI: oai:DiVA.org:kth-207952DiVA, id: diva2:1103317
Note

QC 20170530

Available from: 2017-05-30 Created: 2017-05-30 Last updated: 2017-06-30Bibliographically approved

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Kastanas, Konstatinos A.Lund-Jensen, BengtSidebo, P. EdvinStrandberg, Jonas

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