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Properties of g→b¯b at small opening angles in pp collisions with the ATLAS detector at √s=13 TeV

Aaboud, M; Aad, G; Abbott, B; Abbott, DC; Abdinov, O; Abeloos, B; Abhayasinghe, DK; ... Zwalinski, L; + view all (2019) Properties of g→b¯b at small opening angles in pp collisions with the ATLAS detector at √s=13 TeV. Physical Review D , 99 (5) , Article 052004. 10.1103/PhysRevD.99.052004. Green open access

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Abstract

The fragmentation of high-energy gluons at small opening angles is largely unconstrained by present measurements. Gluon splitting to b -quark pairs is a unique probe into the properties of gluon fragmentation because identified b -tagged jets provide a proxy for the quark daughters of the initial gluon. In this study, key differential distributions related to the g → b ¯ b process are measured using 33     fb − 1 of √ s = 13     TeV p p collision data recorded by the ATLAS experiment at the LHC in 2016. Jets constructed from charged-particle tracks, clustered with the anti- k t jet algorithm with radius parameter R = 0.2 , are used to probe angular scales below the R = 0.4 jet radius. The observables are unfolded to particle level in order to facilitate direct comparisons with predictions from present and future simulations. Multiple significant differences are observed between the data and parton shower Monte Carlo predictions, providing input to improve these predictions of the main source of background events in analyses involving boosted Higgs bosons decaying into b -quarks.

Type: Article
Title: Properties of g→b¯b at small opening angles in pp collisions with the ATLAS detector at √s=13 TeV
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevD.99.052004
Publisher version: https://doi.org/10.1103/PhysRevD.99.052004
Language: English
Additional information: Copyright © 2019 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license (https://creativecommons.org/licenses/by/4.0/). Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Keywords: particle interactions, bottom quark, gluons, particle data analysis
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: http://discovery.ucl.ac.uk/id/eprint/10071953
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