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Measurement of jet activity in top quark events using the e mu final state with two b-tagged jets in pp collisions at root s=8 TeV with the ATLAS detector
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0003-3867-0336
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.
KTH, School of Engineering Sciences (SCI), Physics, Particle and Astroparticle Physics.ORCID iD: 0000-0002-8913-0981
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Number of Authors: 28632016 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 074, no 9Article in journal (Refereed) Published
Abstract [en]

Measurements of the jet activity in t (t) over bar events produced in proton-proton collisions at root s = 8 TeV are presented, using 20.3 fb(-1) of data collected by the ATLAS experiment at the Large Hadron Collider. The events were selected in the dilepton e mu decay channel with two identified b-jets. The numbers of additional jets for various jet transverse momentum ( p(T)) thresholds, and the normalised differential cross-sections as a function of p(T) for the five highest-p(T) additional jets, were measured in the jet pseudorapidity range broken vertical bar eta broken vertical bar < 4.5. The gap fraction, the fraction of events which do not contain an additional jet in a central rapidity region, was measured for several rapidity intervals as a function of the minimum p(T) of a single jet or the scalar sum of p(T) of all additional jets. These fractions were also measured in different intervals of the invariant mass of the e mu b<(b)over bar> b system. All measurements were corrected for detector effects, and found to be mostly well-described by predictions from next-to-leading-order and leading-order t (t) over bar t event generators with appropriate parameter choices. The results can be used to further optimise the parameters used in such generators.

Place, publisher, year, edition, pages
Springer, 2016. Vol. 074, no 9
Keywords [en]
Hadron-Hadron scattering (experiments)
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:kth:diva-199849DOI: 10.1007/JHEP09(2016)074ISI: 000384432800001Scopus ID: 2-s2.0-84988485941OAI: oai:DiVA.org:kth-199849DiVA, id: diva2:1065602
Note

QC 20170119

Available from: 2017-01-16 Created: 2017-01-16 Last updated: 2019-12-04Bibliographically approved

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Lund-Jensen, Bengt

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