Measurement of jet activity in top quark events using the <i>eμ</i> final state with two <i>b</i>-tagged jets in <i>pp</i> collisions at √<i>s</i>=8 TeV with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Abeloos, B, Aben, R, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2853 more authors) (2016) Measurement of jet activity in top quark events using the <i>eμ</i> final state with two <i>b</i>-tagged jets in <i>pp</i> collisions at √<i>s</i>=8 TeV with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 09 (9). 074-.

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Abstract

Measurements of the jet activity in $t\bar{t}$ events produced in proton--proton collisions at $\sqrt{s}=8$ 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 $|\eta|<4.5$. 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 regions of the invariant mass of the $e\mu b\bar{b}$ 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 $t\bar{t}$ event generators with appropriate parameter choices. The results can be used to further optimise the parameters used in such generators.

Item Type: Article
Additional Information: 42 pages plus author list + cover pages (49 pages total), 19 figures, 11 tables, published in JHEP. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2015-04/
Uncontrolled Keywords: Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 16 Mar 2017 11:33
Last Modified: 06 Oct 2023 14:05
DOI: 10.1007/JHEP09(2016)074
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3006442