Measurement of the top-quark mass using a leptonic invariant mass in pp collisions at √s = 13 TeV with the ATLAS detector

ATLAS Publications, Benjamin Wynne, M. Faucci Giannelli, A. Hasib, M.P. Heath, X. Hoad, S. Palazzo, A. Søgaard, A. Strubig, E.P. Takeva, A.J. Taylor, A. Washbrook

Research output: Contribution to journalArticlepeer-review

Abstract / Description of output

A measurement of the top-quark mass (mtt​) in the tt‾tt → lepton + jets channel is presented, with an experimental technique which exploits semileptonic decays of b-hadrons produced in the top-quark decay chain. The distribution of the invariant mass mℓμℓμ​ of the lepton, ℓ (with ℓ = e, μ), from the W-boson decay and the muon, μ, originating from the b-hadron decay is reconstructed, and a binned-template profile likelihood fit is performed to extract mtt​. The measurement is based on data corresponding to an integrated luminosity of 36.1 fb−1−1 of ss​ = 13 TeV pp collisions provided by the Large Hadron Collider and recorded by the ATLAS detector. The measured value of the top-quark mass is mtt​ = 174.41 ± 0.39 (stat.) ± 0.66 (syst.) ± 0.25 (recoil) GeV, where the third uncertainty arises from changing the Pythia8 parton shower gluon-recoil scheme, used in top-quark decays, to a recently developed setup.
Original languageEnglish
Article number19
Pages (from-to)1-55
Number of pages55
Journal Journal of High Energy Physics
Volume2023
Issue number6
DOIs
Publication statusPublished - 5 Jun 2023

Keywords / Materials (for Non-textual outputs)

  • Hadron-Hadron Scattering
  • Top Physics

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