Performance and calibration of quark/gluon-jet taggers using 140 fb<sup>−1</sup> of pp collisions at TeV with the ATLAS detector*



Aad, G, Abbott, B, Abeling, K, Abicht, NJ, Abidi, SH, Aboulhorma, A, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS
et al (show 2933 more authors) (2024) Performance and calibration of quark/gluon-jet taggers using 140 fb<sup>−1</sup> of pp collisions at TeV with the ATLAS detector*. Chinese Physics C, 48 (2). 023001-023001.

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Abstract

<jats:title>Abstract</jats:title> <jats:p>The identification of jets originating from quarks and gluons, often referred to as quark/gluon tagging, plays an important role in various analyses performed at the Large Hadron Collider, as Standard Model measurements and searches for new particles decaying to quarks often rely on suppressing a large gluon-induced background. This paper describes the measurement of the efficiencies of quark/gluon taggers developed within the ATLAS Collaboration, using <jats:inline-formula> <jats:tex-math><?CDATA $\sqrt{s} = 13$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_48_2_023001_M4.jpg" xlink:type="simple" /> </jats:inline-formula> TeV proton–proton collision data with an integrated luminosity of 140 fb<jats:inline-formula> <jats:tex-math><?CDATA $^{-1}$?></jats:tex-math> <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="cpc_48_2_023001_M5.jpg" xlink:type="simple" /> </jats:inline-formula> collected by the ATLAS experiment. Two taggers with high performances in rejecting jets from gluon over jets from quarks are studied: one tagger is based on requirements on the number of inner-detector tracks associated with the jet, and the other combines several jet substructure observables using a boosted decision tree. A method is established to determine the quark/gluon fraction in data, by using quark/gluon-enriched subsamples defined by the jet pseudorapidity. Differences in tagging efficiency between data and simulation are provided for jets with transverse momentum between 500 GeV and 2 TeV and for multiple tagger working points.</jats:p>

Item Type: Article
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 16 Feb 2024 09:46
Last Modified: 27 Feb 2024 08:17
DOI: 10.1088/1674-1137/acf701
Open Access URL: https://iopscience.iop.org/article/10.1088/1674-11...
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3178694