Measurement of colour flow using jet-pull observables in in t(t)over-bar events with the ATLAS experiment at root s=13TeV



Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, AbouZeid, OS, Abraham, NL, Abramowicz, H, Abreu, H
et al (show 2833 more authors) (2018) Measurement of colour flow using jet-pull observables in in t(t)over-bar events with the ATLAS experiment at root s=13TeV. EUROPEAN PHYSICAL JOURNAL C, 78 (10). 847-.

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Abstract

Previous studies have shown that weighted angular moments derived from jet constituents encode the colour connections between partons that seed the jets. This paper presents measurements of two such distributions, the jet-pull angle and jet-pull magnitude, both of which are derived from the jet-pull angular moment. The measurement is performed in t t ¯ events with one leptonically decaying <i>W</i> boson and one hadronically decaying <i>W</i> boson, using 36.1 fb - 1 of <i>pp</i> collision data recorded by the ATLAS detector at s = 13 TeV delivered by the Large Hadron Collider. The observables are measured for two dijet systems, corresponding to the colour-connected daughters of the <i>W</i> boson and the two <i>b</i>-jets from the top-quark decays, which are not expected to be colour connected. To allow the comparison of the measured distributions to colour model predictions, the measured distributions are unfolded to particle level, after correcting for experimental effects introduced by the detector. While good agreement can be found for some combinations of predictions and observables, none of the predictions describes the data well across all observables.

Item Type: Article
Additional Information: 45 pages in total, author list starting page 29, 6 figures, 5 tables, submitted to EPJC. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2017-13/
Uncontrolled Keywords: ATLAS Collaboration
Depositing User: Symplectic Admin
Date Deposited: 10 Sep 2018 15:16
Last Modified: 31 Jan 2024 09:29
DOI: 10.1140/epjc/s10052-018-6290-2
Open Access URL: https://doi.org/10.1140/epjc/s10052-018-6290-2
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3026064