Properties of g →b b at small opening angles in pp collisions with the ATLAS detector at s =13 TeV PROPERTIES of g →b b at ... M. AABOUD et al.

(ATLAS Collaboration)

Research output: Contribution to journalArticle

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→bb process are measured using 33 fb-1 of s=13 TeV pp collision data recorded by the ATLAS experiment at the LHC in 2016. Jets constructed from charged-particle tracks, clustered with the anti-kt 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.

Original languageEnglish
Article number052004
JournalPhysical Review D
Volume99
Issue number5
DOIs
Publication statusPublished - 2019 Mar 1

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collisions
detectors
quarks
fragmentation
predictions
particle tracks
radii
probes
gluons
showers
Higgs bosons
partons
charged particles
simulation
energy

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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Properties of g →b b at small opening angles in pp collisions with the ATLAS detector at s =13 TeV PROPERTIES of g →b b at ... M. AABOUD et al. / (ATLAS Collaboration).

In: Physical Review D, Vol. 99, No. 5, 052004, 01.03.2019.

Research output: Contribution to journalArticle

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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→bb process are measured using 33 fb-1 of s=13 TeV pp collision data recorded by the ATLAS experiment at the LHC in 2016. Jets constructed from charged-particle tracks, clustered with the anti-kt 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.",
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