Measurements of jet observables sensitive to b-quark fragmentation in tt̅ events at the LHC with the ATLAS detector

ATLAS Collaboration, Paul Newman

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Several observables sensitive to the fragmentation of b-quarks into b-hadrons are measured using 36 fb−1 of √s = 13 TeV proton-proton collision data collected with the ATLAS detector at the LHC. Jets containing b-hadrons are obtained from a sample of dileptonic tt̅ events, and the associated set of charged-particle tracks is separated into those from the primary pp interaction vertex and those from the displaced b-decay secondary vertex. This division is used to construct observables that characterize the longitudinal and transverse momentum distributions of the b-hadron within the jet. The measurements have been corrected for detector effects and provide a test of heavy-quark-fragmentation modeling at the LHC in a system where the top-quark decay products are color-connected to the proton beam remnants. The unfolded distributions are compared with the predictions of modern Monte Carlo parton-shower generators, and these predictions are found to be largely in agreement with the observed data. These measurements complement similar measurements from e+e collider experiments in which the b-quarks originate from a color-singlet Z/γ.
Original languageEnglish
Article number032008
Number of pages33
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Issue number3
Publication statusPublished - 9 Aug 2022

Bibliographical note

49 pages in total, author list starting page 33, 10 figures, 3 tables, submitted to PRD. All figures including auxiliary figures are available at


  • hep-ex


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